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><TD
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><H1
><A
NAME="GTS-TRIANGLES"
></A
>Triangles</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN7291"
></A
><H2
>Name</H2
>Triangles -- triangle object and related functions.</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN7294"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
> #include <gts.h>
#define <A
HREF="gts-triangles.html#GTS-TRIANGLE-CLASS:CAPS"
>GTS_TRIANGLE_CLASS</A
> (klass)
#define <A
HREF="gts-triangles.html#GTS-TRIANGLE:CAPS"
>GTS_TRIANGLE</A
> (obj)
#define <A
HREF="gts-triangles.html#GTS-IS-TRIANGLE:CAPS"
>GTS_IS_TRIANGLE</A
> (obj)
<A
HREF="gts-triangles.html#GTSTRIANGLECLASS"
>GtsTriangleClass</A
>;
<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
>;
<A
HREF="gts-triangles.html#GTSTRIANGLECLASS"
>GtsTriangleClass</A
>* <A
HREF="gts-triangles.html#GTS-TRIANGLE-CLASS"
>gts_triangle_class</A
> (void);
<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
>* <A
HREF="gts-triangles.html#GTS-TRIANGLE-NEW"
>gts_triangle_new</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLECLASS"
>GtsTriangleClass</A
> *klass,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e1,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e2,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e3);
<GTKDOCLINK
HREF="VOID"
>void</GTKDOCLINK
> <A
HREF="gts-triangles.html#GTS-TRIANGLE-SET"
>gts_triangle_set</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *triangle,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e1,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e2,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e3);
<GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> <A
HREF="gts-triangles.html#GTS-TRIANGLE-AREA"
>gts_triangle_area</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t);
<GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> <A
HREF="gts-triangles.html#GTS-TRIANGLE-PERIMETER"
>gts_triangle_perimeter</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t);
<GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> <A
HREF="gts-triangles.html#GTS-TRIANGLE-QUALITY"
>gts_triangle_quality</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t);
<GTKDOCLINK
HREF="VOID"
>void</GTKDOCLINK
> <A
HREF="gts-triangles.html#GTS-TRIANGLE-NORMAL"
>gts_triangle_normal</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t,
<GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> *x,
<GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> *y,
<GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> *z);
<GTKDOCLINK
HREF="VOID"
>void</GTKDOCLINK
> <A
HREF="gts-triangles.html#GTS-TRIANGLE-REVERT"
>gts_triangle_revert</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t);
<GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> <A
HREF="gts-triangles.html#GTS-TRIANGLE-ORIENTATION"
>gts_triangle_orientation</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t);
<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
>* <A
HREF="gts-triangles.html#GTS-TRIANGLE-IS-DUPLICATE"
>gts_triangle_is_duplicate</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t);
<GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> <A
HREF="gts-triangles.html#GTS-TRIANGLES-ANGLE"
>gts_triangles_angle</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t1,
<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t2);
<GTKDOCLINK
HREF="GBOOLEAN"
>gboolean</GTKDOCLINK
> <A
HREF="gts-triangles.html#GTS-TRIANGLES-ARE-COMPATIBLE"
>gts_triangles_are_compatible</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t1,
<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t2,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e);
<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
>* <A
HREF="gts-triangles.html#GTS-TRIANGLE-ENCLOSING"
>gts_triangle_enclosing</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLECLASS"
>GtsTriangleClass</A
> *klass,
<GTKDOCLINK
HREF="GSLIST"
>GSList</GTKDOCLINK
> *points,
<GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> scale);
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
>* <A
HREF="gts-triangles.html#GTS-TRIANGLES-COMMON-EDGE"
>gts_triangles_common_edge</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t1,
<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t2);
<GTKDOCLINK
HREF="GUINT"
>guint</GTKDOCLINK
> <A
HREF="gts-triangles.html#GTS-TRIANGLE-NEIGHBOR-NUMBER"
>gts_triangle_neighbor_number</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t);
<GTKDOCLINK
HREF="GSLIST"
>GSList</GTKDOCLINK
>* <A
HREF="gts-triangles.html#GTS-TRIANGLE-NEIGHBORS"
>gts_triangle_neighbors</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t);
<GTKDOCLINK
HREF="VOID"
>void</GTKDOCLINK
> <A
HREF="gts-triangles.html#GTS-TRIANGLE-VERTICES-EDGES"
>gts_triangle_vertices_edges</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e,
<A
HREF="gts-vertices.html#GTSVERTEX"
>GtsVertex</A
> **v1,
<A
HREF="gts-vertices.html#GTSVERTEX"
>GtsVertex</A
> **v2,
<A
HREF="gts-vertices.html#GTSVERTEX"
>GtsVertex</A
> **v3,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> **e1,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> **e2,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> **e3);
<A
HREF="gts-vertices.html#GTSVERTEX"
>GtsVertex</A
>* <A
HREF="gts-triangles.html#GTS-TRIANGLE-VERTEX-OPPOSITE"
>gts_triangle_vertex_opposite</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e);
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
>* <A
HREF="gts-triangles.html#GTS-TRIANGLE-EDGE-OPPOSITE"
>gts_triangle_edge_opposite</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t,
<A
HREF="gts-vertices.html#GTSVERTEX"
>GtsVertex</A
> *v);
<GTKDOCLINK
HREF="VOID"
>void</GTKDOCLINK
> <A
HREF="gts-triangles.html#GTS-TRIANGLE-VERTICES"
>gts_triangle_vertices</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t,
<A
HREF="gts-vertices.html#GTSVERTEX"
>GtsVertex</A
> **v1,
<A
HREF="gts-vertices.html#GTSVERTEX"
>GtsVertex</A
> **v2,
<A
HREF="gts-vertices.html#GTSVERTEX"
>GtsVertex</A
> **v3);
#define <A
HREF="gts-triangles.html#GTS-TRIANGLE-VERTEX"
>gts_triangle_vertex</A
> (t)
<GTKDOCLINK
HREF="GBOOLEAN"
>gboolean</GTKDOCLINK
> <A
HREF="gts-triangles.html#GTS-TRIANGLE-IS-OK"
>gts_triangle_is_ok</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t);
<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
>* <A
HREF="gts-triangles.html#GTS-TRIANGLE-USE-EDGES"
>gts_triangle_use_edges</A
> (<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e1,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e2,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e3);
<A
HREF="gts-points.html#GTSPOINT"
>GtsPoint</A
>* <A
HREF="gts-triangles.html#GTS-TRIANGLE-CIRCUMCIRCLE-CENTER"
>gts_triangle_circumcircle_center</A
>
(<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t,
<A
HREF="gts-points.html#GTSPOINTCLASS"
>GtsPointClass</A
> *point_class);
<A
HREF="gts-object-class.html#GTSOBJECT"
>GtsObject</A
>* <A
HREF="gts-triangles.html#GTS-TRIANGLE-IS-STABBED"
>gts_triangle_is_stabbed</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t,
<A
HREF="gts-points.html#GTSPOINT"
>GtsPoint</A
> *p,
<GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> *orientation);
<GTKDOCLINK
HREF="GBOOLEAN"
>gboolean</GTKDOCLINK
> <A
HREF="gts-triangles.html#GTS-TRIANGLES-ARE-FOLDED"
>gts_triangles_are_folded</A
> (<GTKDOCLINK
HREF="GSLIST"
>GSList</GTKDOCLINK
> *triangles,
<A
HREF="gts-vertices.html#GTSVERTEX"
>GtsVertex</A
> *A,
<A
HREF="gts-vertices.html#GTSVERTEX"
>GtsVertex</A
> *B,
<GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> max);
<GTKDOCLINK
HREF="GSLIST"
>GSList</GTKDOCLINK
>* <A
HREF="gts-triangles.html#GTS-TRIANGLES-FROM-EDGES"
>gts_triangles_from_edges</A
> (<GTKDOCLINK
HREF="GSLIST"
>GSList</GTKDOCLINK
> *edges);
<GTKDOCLINK
HREF="VOID"
>void</GTKDOCLINK
> <A
HREF="gts-triangles.html#GTS-TRIANGLE-INTERPOLATE-HEIGHT"
>gts_triangle_interpolate_height</A
> (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t,
<A
HREF="gts-points.html#GTSPOINT"
>GtsPoint</A
> *p);</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN7419"
></A
><H2
>Description</H2
><P
>A <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
> is defined by three <A
HREF="gts-edges.html#GTSEDGE"
><SPAN
CLASS="TYPE"
>GtsEdge</SPAN
></A
>. They are oriented, the normal to the triangle points toward an observer seing the three edges in counter-clockwise order.</P
><P
>When destroying a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>, all the edges not used by another triangle are also destroyed. This default behaviour can be changed punctually by setting the global variable gts_allow_floating_edges to <TT
CLASS="LITERAL"
>TRUE</TT
>. You must not forget to set this variable back to <TT
CLASS="LITERAL"
>FALSE</TT
> as all the algorithms of GTS assume the default behaviour.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN7431"
></A
><H2
>Details</H2
><DIV
CLASS="REFSECT2"
><A
NAME="AEN7433"
></A
><H3
><A
NAME="GTS-TRIANGLE-CLASS:CAPS"
></A
>GTS_TRIANGLE_CLASS()</H3
><PRE
CLASS="PROGRAMLISTING"
>#define GTS_TRIANGLE_CLASS(klass)</PRE
><P
>Casts <CODE
CLASS="PARAMETER"
>klass</CODE
> to <A
HREF="gts-triangles.html#GTSTRIANGLECLASS"
><SPAN
CLASS="TYPE"
>GtsTriangleClass</SPAN
></A
>.</P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7444"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>klass</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>a descendant of <A
HREF="gts-triangles.html#GTSTRIANGLECLASS"
><SPAN
CLASS="TYPE"
>GtsTriangleClass</SPAN
></A
>.
</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN7451"
></A
><H3
><A
NAME="GTS-TRIANGLE:CAPS"
></A
>GTS_TRIANGLE()</H3
><PRE
CLASS="PROGRAMLISTING"
>#define GTS_TRIANGLE(obj)</PRE
><P
>Casts <CODE
CLASS="PARAMETER"
>obj</CODE
> to <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7462"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>obj</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>a descendant of <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.
</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN7469"
></A
><H3
><A
NAME="GTS-IS-TRIANGLE:CAPS"
></A
>GTS_IS_TRIANGLE()</H3
><PRE
CLASS="PROGRAMLISTING"
>#define GTS_IS_TRIANGLE(obj)</PRE
><P
>Evaluates to <TT
CLASS="LITERAL"
>TRUE</TT
> if <CODE
CLASS="PARAMETER"
>obj</CODE
> is a descendant of <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>, <TT
CLASS="LITERAL"
>FALSE</TT
> otherwise.</P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7482"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>obj</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>a pointer to test.
</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN7487"
></A
><H3
><A
NAME="GTSTRIANGLECLASS"
></A
>GtsTriangleClass</H3
><PRE
CLASS="PROGRAMLISTING"
>typedef struct {
GtsObjectClass parent_class;
} GtsTriangleClass;</PRE
><P
>The triangle class, just derived from <A
HREF="gts-object-class.html#GTSOBJECT"
><SPAN
CLASS="TYPE"
>GtsObject</SPAN
></A
>.</P
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN7496"
></A
><H3
><A
NAME="GTSTRIANGLE"
></A
>GtsTriangle</H3
><PRE
CLASS="PROGRAMLISTING"
>typedef struct {
GtsObject object;
GtsEdge * e1;
GtsEdge * e2;
GtsEdge * e3;
} GtsTriangle;</PRE
><P
>The triangle object.</P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7504"><SPAN
STYLE="white-space: nowrap"
><A
HREF="gts-object-class.html#GTSOBJECT"
>GtsObject</A
> <CODE
CLASS="STRUCTFIELD"
>object</CODE
>;</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>Parent object.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7510"><SPAN
STYLE="white-space: nowrap"
><A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *<CODE
CLASS="STRUCTFIELD"
>e1</CODE
>;</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>First edge.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7516"><SPAN
STYLE="white-space: nowrap"
><A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *<CODE
CLASS="STRUCTFIELD"
>e2</CODE
>;</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>Second edge.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7522"><SPAN
STYLE="white-space: nowrap"
><A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *<CODE
CLASS="STRUCTFIELD"
>e3</CODE
>;</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>Third edge. </P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN7528"
></A
><H3
><A
NAME="GTS-TRIANGLE-CLASS"
></A
>gts_triangle_class ()</H3
><PRE
CLASS="PROGRAMLISTING"
><A
HREF="gts-triangles.html#GTSTRIANGLECLASS"
>GtsTriangleClass</A
>* gts_triangle_class (void);</PRE
><P
></P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7538"><SPAN
STYLE="white-space: nowrap"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> the <A
HREF="gts-triangles.html#GTSTRIANGLECLASS"
><SPAN
CLASS="TYPE"
>GtsTriangleClass</SPAN
></A
>.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN7545"
></A
><H3
><A
NAME="GTS-TRIANGLE-NEW"
></A
>gts_triangle_new ()</H3
><PRE
CLASS="PROGRAMLISTING"
><A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
>* gts_triangle_new (<A
HREF="gts-triangles.html#GTSTRIANGLECLASS"
>GtsTriangleClass</A
> *klass,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e1,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e2,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e3);</PRE
><P
></P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7559"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>klass</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLECLASS"
><SPAN
CLASS="TYPE"
>GtsTriangleClass</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7566"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>e1</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-edges.html#GTSEDGE"
><SPAN
CLASS="TYPE"
>GtsEdge</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7573"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>e2</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> another <A
HREF="gts-edges.html#GTSEDGE"
><SPAN
CLASS="TYPE"
>GtsEdge</SPAN
></A
> touching <CODE
CLASS="PARAMETER"
>e1</CODE
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7581"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>e3</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> another <A
HREF="gts-edges.html#GTSEDGE"
><SPAN
CLASS="TYPE"
>GtsEdge</SPAN
></A
> touching both <CODE
CLASS="PARAMETER"
>e1</CODE
> and <CODE
CLASS="PARAMETER"
>e2</CODE
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7590"><SPAN
STYLE="white-space: nowrap"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a new <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
> having <CODE
CLASS="PARAMETER"
>e1</CODE
>, <CODE
CLASS="PARAMETER"
>e2</CODE
> and <CODE
CLASS="PARAMETER"
>e3</CODE
> as edges.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN7600"
></A
><H3
><A
NAME="GTS-TRIANGLE-SET"
></A
>gts_triangle_set ()</H3
><PRE
CLASS="PROGRAMLISTING"
><GTKDOCLINK
HREF="VOID"
>void</GTKDOCLINK
> gts_triangle_set (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *triangle,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e1,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e2,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e3);</PRE
><P
>Sets the edge of <CODE
CLASS="PARAMETER"
>triangle</CODE
> to <CODE
CLASS="PARAMETER"
>e1</CODE
>, <CODE
CLASS="PARAMETER"
>e2</CODE
> and <CODE
CLASS="PARAMETER"
>e3</CODE
> while checking that they
define a valid triangle.</P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7618"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>triangle</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7625"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>e1</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-edges.html#GTSEDGE"
><SPAN
CLASS="TYPE"
>GtsEdge</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7632"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>e2</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> another <A
HREF="gts-edges.html#GTSEDGE"
><SPAN
CLASS="TYPE"
>GtsEdge</SPAN
></A
> touching <CODE
CLASS="PARAMETER"
>e1</CODE
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7640"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>e3</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> another <A
HREF="gts-edges.html#GTSEDGE"
><SPAN
CLASS="TYPE"
>GtsEdge</SPAN
></A
> touching both <CODE
CLASS="PARAMETER"
>e1</CODE
> and <CODE
CLASS="PARAMETER"
>e2</CODE
>.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN7649"
></A
><H3
><A
NAME="GTS-TRIANGLE-AREA"
></A
>gts_triangle_area ()</H3
><PRE
CLASS="PROGRAMLISTING"
><GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> gts_triangle_area (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t);</PRE
><P
></P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7660"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7667"><SPAN
STYLE="white-space: nowrap"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> the area of the triangle <CODE
CLASS="PARAMETER"
>t</CODE
>.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN7673"
></A
><H3
><A
NAME="GTS-TRIANGLE-PERIMETER"
></A
>gts_triangle_perimeter ()</H3
><PRE
CLASS="PROGRAMLISTING"
><GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> gts_triangle_perimeter (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t);</PRE
><P
></P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7684"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7691"><SPAN
STYLE="white-space: nowrap"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> the perimeter of the triangle <CODE
CLASS="PARAMETER"
>t</CODE
>.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN7697"
></A
><H3
><A
NAME="GTS-TRIANGLE-QUALITY"
></A
>gts_triangle_quality ()</H3
><PRE
CLASS="PROGRAMLISTING"
><GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> gts_triangle_quality (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t);</PRE
><P
>The quality of a triangle is defined as the ratio of the square
root of its surface area to its perimeter relative to this same
ratio for an equilateral triangle with the same area. The quality
is then one for an equilateral triangle and tends to zero for a
very stretched triangle.</P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7708"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7715"><SPAN
STYLE="white-space: nowrap"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> the quality of the triangle <CODE
CLASS="PARAMETER"
>t</CODE
>.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN7721"
></A
><H3
><A
NAME="GTS-TRIANGLE-NORMAL"
></A
>gts_triangle_normal ()</H3
><PRE
CLASS="PROGRAMLISTING"
><GTKDOCLINK
HREF="VOID"
>void</GTKDOCLINK
> gts_triangle_normal (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t,
<GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> *x,
<GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> *y,
<GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> *z);</PRE
><P
>Computes the coordinates of the oriented normal of <CODE
CLASS="PARAMETER"
>t</CODE
> as the
cross-product of two edges, using the left-hand rule. The normal is
not normalized. If this triangle is part of a closed and oriented
surface, the normal points to the outside of the surface.</P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7736"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7743"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>x</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> the x coordinate of the normal.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7748"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>y</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> the y coordinate of the normal.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7753"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>z</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> the z coordinate of the normal.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN7758"
></A
><H3
><A
NAME="GTS-TRIANGLE-REVERT"
></A
>gts_triangle_revert ()</H3
><PRE
CLASS="PROGRAMLISTING"
><GTKDOCLINK
HREF="VOID"
>void</GTKDOCLINK
> gts_triangle_revert (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t);</PRE
><P
>Changes the orientation of triangle <CODE
CLASS="PARAMETER"
>t</CODE
>, turning it inside out.</P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7770"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN7777"
></A
><H3
><A
NAME="GTS-TRIANGLE-ORIENTATION"
></A
>gts_triangle_orientation ()</H3
><PRE
CLASS="PROGRAMLISTING"
><GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> gts_triangle_orientation (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t);</PRE
><P
>Checks for the orientation of the plane (x,y) projection of a
triangle. See <A
HREF="gts-points.html#GTS-POINT-ORIENTATION"
><CODE
CLASS="FUNCTION"
>gts_point_orientation()</CODE
></A
> for details. This function
is geometrically robust.</P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7790"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7797"><SPAN
STYLE="white-space: nowrap"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a number depending on the orientation of the vertices of <CODE
CLASS="PARAMETER"
>t</CODE
>.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN7803"
></A
><H3
><A
NAME="GTS-TRIANGLE-IS-DUPLICATE"
></A
>gts_triangle_is_duplicate ()</H3
><PRE
CLASS="PROGRAMLISTING"
><A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
>* gts_triangle_is_duplicate (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t);</PRE
><P
></P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7814"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7821"><SPAN
STYLE="white-space: nowrap"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
> different from <CODE
CLASS="PARAMETER"
>t</CODE
> but sharing all its edges
with <CODE
CLASS="PARAMETER"
>t</CODE
> or <TT
CLASS="LITERAL"
>NULL</TT
> if there is none.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN7831"
></A
><H3
><A
NAME="GTS-TRIANGLES-ANGLE"
></A
>gts_triangles_angle ()</H3
><PRE
CLASS="PROGRAMLISTING"
><GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> gts_triangles_angle (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t1,
<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t2);</PRE
><P
></P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7843"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t1</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7850"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t2</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7857"><SPAN
STYLE="white-space: nowrap"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> the value (in radians) of the angle between <CODE
CLASS="PARAMETER"
>t1</CODE
> and <CODE
CLASS="PARAMETER"
>t2</CODE
>.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN7864"
></A
><H3
><A
NAME="GTS-TRIANGLES-ARE-COMPATIBLE"
></A
>gts_triangles_are_compatible ()</H3
><PRE
CLASS="PROGRAMLISTING"
><GTKDOCLINK
HREF="GBOOLEAN"
>gboolean</GTKDOCLINK
> gts_triangles_are_compatible (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t1,
<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t2,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e);</PRE
><P
>Checks if <CODE
CLASS="PARAMETER"
>t1</CODE
> and <CODE
CLASS="PARAMETER"
>t2</CODE
> have compatible orientations i.e. if <CODE
CLASS="PARAMETER"
>t1</CODE
> and
<CODE
CLASS="PARAMETER"
>t2</CODE
> can be part of the same surface without conflict in the surface
normal orientation.</P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7881"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t1</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7888"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t2</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7895"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>e</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-edges.html#GTSEDGE"
><SPAN
CLASS="TYPE"
>GtsEdge</SPAN
></A
> used by both <CODE
CLASS="PARAMETER"
>t1</CODE
> and <CODE
CLASS="PARAMETER"
>t2</CODE
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7904"><SPAN
STYLE="white-space: nowrap"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> <TT
CLASS="LITERAL"
>TRUE</TT
> if <CODE
CLASS="PARAMETER"
>t1</CODE
> and <CODE
CLASS="PARAMETER"
>t2</CODE
> are compatible, <TT
CLASS="LITERAL"
>FALSE</TT
> otherwise.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN7913"
></A
><H3
><A
NAME="GTS-TRIANGLE-ENCLOSING"
></A
>gts_triangle_enclosing ()</H3
><PRE
CLASS="PROGRAMLISTING"
><A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
>* gts_triangle_enclosing (<A
HREF="gts-triangles.html#GTSTRIANGLECLASS"
>GtsTriangleClass</A
> *klass,
<GTKDOCLINK
HREF="GSLIST"
>GSList</GTKDOCLINK
> *points,
<GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> scale);</PRE
><P
>Builds a new triangle (including new vertices and edges) enclosing
the plane projection of all the points in <CODE
CLASS="PARAMETER"
>points</CODE
>. This triangle is
equilateral and encloses a rectangle defined by the maximum and
minimum x and y coordinates of the points. <CODE
CLASS="PARAMETER"
>scale</CODE
> is an homothetic
scaling factor. If equal to one, the triangle encloses exactly the
enclosing rectangle.</P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7928"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>klass</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> the class of the new triangle.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7933"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>points</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a list of <A
HREF="gts-points.html#GTSPOINT"
><SPAN
CLASS="TYPE"
>GtsPoint</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7940"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>scale</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a scaling factor (must be larger than one).</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7945"><SPAN
STYLE="white-space: nowrap"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a new <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>. </P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN7952"
></A
><H3
><A
NAME="GTS-TRIANGLES-COMMON-EDGE"
></A
>gts_triangles_common_edge ()</H3
><PRE
CLASS="PROGRAMLISTING"
><A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
>* gts_triangles_common_edge (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t1,
<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t2);</PRE
><P
></P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7964"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t1</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7971"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t2</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN7978"><SPAN
STYLE="white-space: nowrap"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-edges.html#GTSEDGE"
><SPAN
CLASS="TYPE"
>GtsEdge</SPAN
></A
> common to both <CODE
CLASS="PARAMETER"
>t1</CODE
> and <CODE
CLASS="PARAMETER"
>t2</CODE
> or <TT
CLASS="LITERAL"
>NULL</TT
> if <CODE
CLASS="PARAMETER"
>t1</CODE
> and <CODE
CLASS="PARAMETER"
>t2</CODE
>
do not share any edge.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN7990"
></A
><H3
><A
NAME="GTS-TRIANGLE-NEIGHBOR-NUMBER"
></A
>gts_triangle_neighbor_number ()</H3
><PRE
CLASS="PROGRAMLISTING"
><GTKDOCLINK
HREF="GUINT"
>guint</GTKDOCLINK
> gts_triangle_neighbor_number (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t);</PRE
><P
></P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8001"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8008"><SPAN
STYLE="white-space: nowrap"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> the number of triangles neighbors of <CODE
CLASS="PARAMETER"
>t</CODE
>.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN8014"
></A
><H3
><A
NAME="GTS-TRIANGLE-NEIGHBORS"
></A
>gts_triangle_neighbors ()</H3
><PRE
CLASS="PROGRAMLISTING"
><GTKDOCLINK
HREF="GSLIST"
>GSList</GTKDOCLINK
>* gts_triangle_neighbors (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t);</PRE
><P
></P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8025"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8032"><SPAN
STYLE="white-space: nowrap"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a list of <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
> neighbors of <CODE
CLASS="PARAMETER"
>t</CODE
>.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN8040"
></A
><H3
><A
NAME="GTS-TRIANGLE-VERTICES-EDGES"
></A
>gts_triangle_vertices_edges ()</H3
><PRE
CLASS="PROGRAMLISTING"
><GTKDOCLINK
HREF="VOID"
>void</GTKDOCLINK
> gts_triangle_vertices_edges (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e,
<A
HREF="gts-vertices.html#GTSVERTEX"
>GtsVertex</A
> **v1,
<A
HREF="gts-vertices.html#GTSVERTEX"
>GtsVertex</A
> **v2,
<A
HREF="gts-vertices.html#GTSVERTEX"
>GtsVertex</A
> **v3,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> **e1,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> **e2,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> **e3);</PRE
><P
>Given <CODE
CLASS="PARAMETER"
>t</CODE
> and <CODE
CLASS="PARAMETER"
>e</CODE
>, returns <CODE
CLASS="PARAMETER"
>v1</CODE
>, <CODE
CLASS="PARAMETER"
>v2</CODE
>, <CODE
CLASS="PARAMETER"
>v3</CODE
>, <CODE
CLASS="PARAMETER"
>e1</CODE
>, <CODE
CLASS="PARAMETER"
>e2</CODE
> and <CODE
CLASS="PARAMETER"
>e3</CODE
>. <CODE
CLASS="PARAMETER"
>e1</CODE
>
has <CODE
CLASS="PARAMETER"
>v1</CODE
> and <CODE
CLASS="PARAMETER"
>v2</CODE
> as vertices, <CODE
CLASS="PARAMETER"
>e2</CODE
> has <CODE
CLASS="PARAMETER"
>v2</CODE
> and <CODE
CLASS="PARAMETER"
>v3</CODE
> as vertices
and <CODE
CLASS="PARAMETER"
>e3</CODE
> has <CODE
CLASS="PARAMETER"
>v3</CODE
> and <CODE
CLASS="PARAMETER"
>v1</CODE
> as vertices. <CODE
CLASS="PARAMETER"
>v1</CODE
>, <CODE
CLASS="PARAMETER"
>v2</CODE
> and <CODE
CLASS="PARAMETER"
>v3</CODE
> respects
the orientation of <CODE
CLASS="PARAMETER"
>t</CODE
>. If <CODE
CLASS="PARAMETER"
>e</CODE
> is not NULL, <CODE
CLASS="PARAMETER"
>e1</CODE
> and <CODE
CLASS="PARAMETER"
>e</CODE
> are
identical.</P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8082"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8089"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>e</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-edges.html#GTSEDGE"
><SPAN
CLASS="TYPE"
>GtsEdge</SPAN
></A
> belonging to the edges of <CODE
CLASS="PARAMETER"
>t</CODE
> or <TT
CLASS="LITERAL"
>NULL</TT
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8098"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>v1</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-vertices.html#GTSVERTEX"
><SPAN
CLASS="TYPE"
>GtsVertex</SPAN
></A
> used by <CODE
CLASS="PARAMETER"
>t</CODE
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8106"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>v2</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-vertices.html#GTSVERTEX"
><SPAN
CLASS="TYPE"
>GtsVertex</SPAN
></A
> used by <CODE
CLASS="PARAMETER"
>t</CODE
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8114"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>v3</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-vertices.html#GTSVERTEX"
><SPAN
CLASS="TYPE"
>GtsVertex</SPAN
></A
> used by <CODE
CLASS="PARAMETER"
>t</CODE
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8122"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>e1</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-edges.html#GTSEDGE"
><SPAN
CLASS="TYPE"
>GtsEdge</SPAN
></A
> used by <CODE
CLASS="PARAMETER"
>t</CODE
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8130"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>e2</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-edges.html#GTSEDGE"
><SPAN
CLASS="TYPE"
>GtsEdge</SPAN
></A
> used by <CODE
CLASS="PARAMETER"
>t</CODE
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8138"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>e3</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-edges.html#GTSEDGE"
><SPAN
CLASS="TYPE"
>GtsEdge</SPAN
></A
> used by <CODE
CLASS="PARAMETER"
>t</CODE
>.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN8146"
></A
><H3
><A
NAME="GTS-TRIANGLE-VERTEX-OPPOSITE"
></A
>gts_triangle_vertex_opposite ()</H3
><PRE
CLASS="PROGRAMLISTING"
><A
HREF="gts-vertices.html#GTSVERTEX"
>GtsVertex</A
>* gts_triangle_vertex_opposite (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e);</PRE
><P
>This function fails if <CODE
CLASS="PARAMETER"
>e</CODE
> is not an edge of <CODE
CLASS="PARAMETER"
>t</CODE
>.</P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8160"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8167"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>e</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-edges.html#GTSEDGE"
><SPAN
CLASS="TYPE"
>GtsEdge</SPAN
></A
> used by <CODE
CLASS="PARAMETER"
>t</CODE
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8175"><SPAN
STYLE="white-space: nowrap"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-vertices.html#GTSVERTEX"
><SPAN
CLASS="TYPE"
>GtsVertex</SPAN
></A
>, vertex of <CODE
CLASS="PARAMETER"
>t</CODE
> which does not belong to <CODE
CLASS="PARAMETER"
>e</CODE
>.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN8184"
></A
><H3
><A
NAME="GTS-TRIANGLE-EDGE-OPPOSITE"
></A
>gts_triangle_edge_opposite ()</H3
><PRE
CLASS="PROGRAMLISTING"
><A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
>* gts_triangle_edge_opposite (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t,
<A
HREF="gts-vertices.html#GTSVERTEX"
>GtsVertex</A
> *v);</PRE
><P
></P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8196"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8203"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>v</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-vertices.html#GTSVERTEX"
><SPAN
CLASS="TYPE"
>GtsVertex</SPAN
></A
> of <CODE
CLASS="PARAMETER"
>t</CODE
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8211"><SPAN
STYLE="white-space: nowrap"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> the edge of <CODE
CLASS="PARAMETER"
>t</CODE
> opposite <CODE
CLASS="PARAMETER"
>v</CODE
> or <TT
CLASS="LITERAL"
>NULL</TT
> if <CODE
CLASS="PARAMETER"
>v</CODE
> is not a vertice of <CODE
CLASS="PARAMETER"
>t</CODE
>.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN8221"
></A
><H3
><A
NAME="GTS-TRIANGLE-VERTICES"
></A
>gts_triangle_vertices ()</H3
><PRE
CLASS="PROGRAMLISTING"
><GTKDOCLINK
HREF="VOID"
>void</GTKDOCLINK
> gts_triangle_vertices (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t,
<A
HREF="gts-vertices.html#GTSVERTEX"
>GtsVertex</A
> **v1,
<A
HREF="gts-vertices.html#GTSVERTEX"
>GtsVertex</A
> **v2,
<A
HREF="gts-vertices.html#GTSVERTEX"
>GtsVertex</A
> **v3);</PRE
><P
>Fills <CODE
CLASS="PARAMETER"
>v1</CODE
>, <CODE
CLASS="PARAMETER"
>v2</CODE
> and <CODE
CLASS="PARAMETER"
>v3</CODE
> with the oriented set of vertices, summits of <CODE
CLASS="PARAMETER"
>t</CODE
>.</P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8239"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8246"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>v1</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a pointer on a <A
HREF="gts-vertices.html#GTSVERTEX"
><SPAN
CLASS="TYPE"
>GtsVertex</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8253"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>v2</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a pointer on a <A
HREF="gts-vertices.html#GTSVERTEX"
><SPAN
CLASS="TYPE"
>GtsVertex</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8260"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>v3</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a pointer on a <A
HREF="gts-vertices.html#GTSVERTEX"
><SPAN
CLASS="TYPE"
>GtsVertex</SPAN
></A
>.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN8267"
></A
><H3
><A
NAME="GTS-TRIANGLE-VERTEX"
></A
>gts_triangle_vertex()</H3
><PRE
CLASS="PROGRAMLISTING"
>#define gts_triangle_vertex(t)</PRE
><P
>Evaluates to the <A
HREF="gts-vertices.html#GTSVERTEX"
><SPAN
CLASS="TYPE"
>GtsVertex</SPAN
></A
> of <CODE
CLASS="PARAMETER"
>t</CODE
> not used by <CODE
CLASS="PARAMETER"
>t->e1</CODE
>.</P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8279"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.
</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN8286"
></A
><H3
><A
NAME="GTS-TRIANGLE-IS-OK"
></A
>gts_triangle_is_ok ()</H3
><PRE
CLASS="PROGRAMLISTING"
><GTKDOCLINK
HREF="GBOOLEAN"
>gboolean</GTKDOCLINK
> gts_triangle_is_ok (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t);</PRE
><P
></P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8297"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8304"><SPAN
STYLE="white-space: nowrap"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> <TT
CLASS="LITERAL"
>TRUE</TT
> if <CODE
CLASS="PARAMETER"
>t</CODE
> is a non-degenerate, non-duplicate triangle,
<TT
CLASS="LITERAL"
>FALSE</TT
> otherwise.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN8312"
></A
><H3
><A
NAME="GTS-TRIANGLE-USE-EDGES"
></A
>gts_triangle_use_edges ()</H3
><PRE
CLASS="PROGRAMLISTING"
><A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
>* gts_triangle_use_edges (<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e1,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e2,
<A
HREF="gts-edges.html#GTSEDGE"
>GtsEdge</A
> *e3);</PRE
><P
></P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8325"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>e1</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-edges.html#GTSEDGE"
><SPAN
CLASS="TYPE"
>GtsEdge</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8332"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>e2</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-edges.html#GTSEDGE"
><SPAN
CLASS="TYPE"
>GtsEdge</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8339"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>e3</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-edges.html#GTSEDGE"
><SPAN
CLASS="TYPE"
>GtsEdge</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8346"><SPAN
STYLE="white-space: nowrap"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
> having <CODE
CLASS="PARAMETER"
>e1</CODE
>, <CODE
CLASS="PARAMETER"
>e2</CODE
> and <CODE
CLASS="PARAMETER"
>e3</CODE
> as edges or <TT
CLASS="LITERAL"
>NULL</TT
> if <CODE
CLASS="PARAMETER"
>e1</CODE
>,
<CODE
CLASS="PARAMETER"
>e2</CODE
> and <CODE
CLASS="PARAMETER"
>e3</CODE
> are not part of any triangle.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN8360"
></A
><H3
><A
NAME="GTS-TRIANGLE-CIRCUMCIRCLE-CENTER"
></A
>gts_triangle_circumcircle_center ()</H3
><PRE
CLASS="PROGRAMLISTING"
><A
HREF="gts-points.html#GTSPOINT"
>GtsPoint</A
>* gts_triangle_circumcircle_center
(<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t,
<A
HREF="gts-points.html#GTSPOINTCLASS"
>GtsPointClass</A
> *point_class);</PRE
><P
></P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8372"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8379"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>point_class</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-points.html#GTSPOINTCLASS"
><SPAN
CLASS="TYPE"
>GtsPointClass</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8386"><SPAN
STYLE="white-space: nowrap"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a new <A
HREF="gts-points.html#GTSPOINT"
><SPAN
CLASS="TYPE"
>GtsPoint</SPAN
></A
>, center of the circumscribing circle of <CODE
CLASS="PARAMETER"
>t</CODE
> or
<TT
CLASS="LITERAL"
>NULL</TT
> if the circumscribing circle is not defined.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN8395"
></A
><H3
><A
NAME="GTS-TRIANGLE-IS-STABBED"
></A
>gts_triangle_is_stabbed ()</H3
><PRE
CLASS="PROGRAMLISTING"
><A
HREF="gts-object-class.html#GTSOBJECT"
>GtsObject</A
>* gts_triangle_is_stabbed (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t,
<A
HREF="gts-points.html#GTSPOINT"
>GtsPoint</A
> *p,
<GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> *orientation);</PRE
><P
></P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8408"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8415"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>p</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-points.html#GTSPOINT"
><SPAN
CLASS="TYPE"
>GtsPoint</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8422"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>orientation</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a pointer or <TT
CLASS="LITERAL"
>NULL</TT
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8428"><SPAN
STYLE="white-space: nowrap"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> one of the vertices of <CODE
CLASS="PARAMETER"
>t</CODE
>, one of the edges of <CODE
CLASS="PARAMETER"
>t</CODE
> or <CODE
CLASS="PARAMETER"
>t</CODE
> if
any of these are stabbed by the ray starting at <CODE
CLASS="PARAMETER"
>p</CODE
> (included) and
ending at (<CODE
CLASS="PARAMETER"
>p</CODE
>->x, <CODE
CLASS="PARAMETER"
>p</CODE
>->y, +infty), <TT
CLASS="LITERAL"
>NULL</TT
> otherwise. If the ray is
contained in the plane of the triangle <TT
CLASS="LITERAL"
>NULL</TT
> is also returned. If
<CODE
CLASS="PARAMETER"
>orientation</CODE
> is not <TT
CLASS="LITERAL"
>NULL</TT
>, it is set to the value of the
orientation of <CODE
CLASS="PARAMETER"
>p</CODE
> relative to <CODE
CLASS="PARAMETER"
>t</CODE
> (as given by
<A
HREF="gts-points.html#GTS-POINT-ORIENTATION-3D"
><CODE
CLASS="FUNCTION"
>gts_point_orientation_3d()</CODE
></A
>). </P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN8447"
></A
><H3
><A
NAME="GTS-TRIANGLES-ARE-FOLDED"
></A
>gts_triangles_are_folded ()</H3
><PRE
CLASS="PROGRAMLISTING"
><GTKDOCLINK
HREF="GBOOLEAN"
>gboolean</GTKDOCLINK
> gts_triangles_are_folded (<GTKDOCLINK
HREF="GSLIST"
>GSList</GTKDOCLINK
> *triangles,
<A
HREF="gts-vertices.html#GTSVERTEX"
>GtsVertex</A
> *A,
<A
HREF="gts-vertices.html#GTSVERTEX"
>GtsVertex</A
> *B,
<GTKDOCLINK
HREF="GDOUBLE"
>gdouble</GTKDOCLINK
> max);</PRE
><P
>Given a list of triangles sharing <CODE
CLASS="PARAMETER"
>A</CODE
> and <CODE
CLASS="PARAMETER"
>B</CODE
> as vertices, checks if any
two triangles in the list make an angle larger than a given value defined
by <CODE
CLASS="PARAMETER"
>max</CODE
>.</P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8464"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>triangles</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a list of <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8471"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>A</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-vertices.html#GTSVERTEX"
><SPAN
CLASS="TYPE"
>GtsVertex</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8478"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>B</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> another <A
HREF="gts-vertices.html#GTSVERTEX"
><SPAN
CLASS="TYPE"
>GtsVertex</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8485"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>max</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> the maximum value of the square of the cosine of the angle between
two triangles.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8490"><SPAN
STYLE="white-space: nowrap"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> <TT
CLASS="LITERAL"
>TRUE</TT
> if any pair of triangles in <CODE
CLASS="PARAMETER"
>triangles</CODE
> makes an angle larger
than the maximum value, <TT
CLASS="LITERAL"
>FALSE</TT
> otherwise.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN8498"
></A
><H3
><A
NAME="GTS-TRIANGLES-FROM-EDGES"
></A
>gts_triangles_from_edges ()</H3
><PRE
CLASS="PROGRAMLISTING"
><GTKDOCLINK
HREF="GSLIST"
>GSList</GTKDOCLINK
>* gts_triangles_from_edges (<GTKDOCLINK
HREF="GSLIST"
>GSList</GTKDOCLINK
> *edges);</PRE
><P
>Builds a list of unique triangles which have one of their edges in <CODE
CLASS="PARAMETER"
>edges</CODE
>.</P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8510"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>edges</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a list of <A
HREF="gts-edges.html#GTSEDGE"
><SPAN
CLASS="TYPE"
>GtsEdge</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8517"><SPAN
STYLE="white-space: nowrap"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> the list of triangles.</P
></TD
></TR
></TBODY
></TABLE
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN8522"
></A
><H3
><A
NAME="GTS-TRIANGLE-INTERPOLATE-HEIGHT"
></A
>gts_triangle_interpolate_height ()</H3
><PRE
CLASS="PROGRAMLISTING"
><GTKDOCLINK
HREF="VOID"
>void</GTKDOCLINK
> gts_triangle_interpolate_height (<A
HREF="gts-triangles.html#GTSTRIANGLE"
>GtsTriangle</A
> *t,
<A
HREF="gts-points.html#GTSPOINT"
>GtsPoint</A
> *p);</PRE
><P
>Fills the z-coordinate of point <CODE
CLASS="PARAMETER"
>p</CODE
> belonging to the plane
projection of triangle <CODE
CLASS="PARAMETER"
>t</CODE
> with the linearly interpolated value of
the z-coordinates of the vertices of <CODE
CLASS="PARAMETER"
>t</CODE
>.</P
><P
></P
><P
></P
><TABLE
CLASS="variablelist"
BORDER="0"
CELLSPACING="0"
CELLPADDING="4"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8537"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>t</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-triangles.html#GTSTRIANGLE"
><SPAN
CLASS="TYPE"
>GtsTriangle</SPAN
></A
>.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><A
NAME="AEN8544"><SPAN
STYLE="white-space: nowrap"
><CODE
CLASS="PARAMETER"
>p</CODE
> :</SPAN
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
> a <A
HREF="gts-points.html#GTSPOINT"
><SPAN
CLASS="TYPE"
>GtsPoint</SPAN
></A
>.</P
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WIDTH="100%"
SUMMARY="Navigation footer"
CELLPADDING="2"
CELLSPACING="2"
><TR
VALIGN="middle"
><TD
ALIGN="left"
><A
ACCESSKEY="p"
HREF="gts-edges.html"
><B
><<< Edges</B
></A
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><TD
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ACCESSKEY="n"
HREF="gts-faces.html"
><B
>Faces >>></B
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