/* -----------------------------------------------------------------------------
* plot2d.c
*
* 2-Dimensional plotting
*
* Author(s) : David Beazley (beazley@cs.uchicago.edu)
* Copyright (C) 1995-1996
*
* See the file LICENSE for information on usage and redistribution.
* ----------------------------------------------------------------------------- */
#define PLOT2D
#include "gifplot.h"
/* ------------------------------------------------------------------------
Plot2D *new_Plot2D(FrameBuffer *frame, xmin, ymin, xmax, ymax)
Create a new 2D plot with given minimum and maximum coordinates.
------------------------------------------------------------------------ */
Plot2D *new_Plot2D(FrameBuffer *frame,double xmin,double ymin,double xmax,double ymax) {
Plot2D *p2;
if (frame) {
if (xmax <= xmin) return (Plot2D *) 0;
if (ymax <= ymin) return (Plot2D *) 0;
p2 = (Plot2D *) malloc(sizeof(Plot2D));
p2->frame = frame;
p2->xmin = xmin;
p2->ymin = ymin;
p2->xmax = xmax;
p2->ymax = ymax;
p2->view_xmin = 0;
p2->view_xmax = frame->width;
p2->view_ymin = 0;
p2->view_ymax = frame->height;
p2->xscale = LINEAR;
p2->yscale = LINEAR;
p2->dx = (p2->view_xmax - p2->view_xmin)/(p2->xmax - p2->xmin);
p2->dy = (p2->view_ymax - p2->view_ymin)/(p2->ymax - p2->ymin);
return p2;
}
return (Plot2D *) 0;
}
/* ----------------------------------------------------------------------------
delete_Plot2D(Plot2D *p2)
Delete a 2D plot
---------------------------------------------------------------------------- */
void
delete_Plot2D(Plot2D *p2) {
if (p2)
free((char *) p2);
}
/* -----------------------------------------------------------------------------
Plot2D *Plot2D_copy(Plot2D *p2)
Makes a copy of the Plot2D data structure.
----------------------------------------------------------------------------- */
Plot2D *Plot2D_copy(Plot2D *p2) {
Plot2D *c2;
if (p2) {
c2 = (Plot2D *) malloc(sizeof(Plot2D));
if (c2) {
c2->frame = p2->frame;
c2->view_xmin = p2->view_xmin;
c2->view_ymin = p2->view_ymin;
c2->view_xmax = p2->view_xmax;
c2->view_ymax = p2->view_ymax;
c2->xmin = p2->xmin;
c2->ymin = p2->ymin;
c2->xmax = p2->xmax;
c2->ymax = p2->ymax;
c2->xscale = p2->xscale;
c2->yscale = p2->yscale;
c2->dx = p2->dx;
c2->dy = p2->dy;
}
return c2;
} else {
return (Plot2D *) 0;
}
}
/* -----------------------------------------------------------------------------
Plot2D_clear(Plot2D *p2, Pixel c)
Clear the region assigned to this plot to the given color.
-------------------------------------------------------------------------- */
void Plot2D_clear(Plot2D *p2, Pixel c) {
int i,j;
for (i = p2->view_xmin; i < p2->view_xmax; i++)
for (j = p2->view_ymin; j < p2->view_ymax; j++) {
p2->frame->pixels[j][i] = c;
}
}
/* ------------------------------------------------------------------------------
Plot2D_setview
Sets the plot region on the framebuffer
------------------------------------------------------------------------------ */
void
Plot2D_setview(Plot2D *p2, int vxmin, int vymin, int vxmax, int vymax) {
if (p2) {
p2->view_xmin = vxmin;
p2->view_ymin = vymin;
p2->view_xmax = vxmax;
p2->view_ymax = vymax;
p2->dx = (p2->view_xmax - p2->view_xmin)/(p2->xmax - p2->xmin);
p2->dy = (p2->view_ymax - p2->view_ymin)/(p2->ymax - p2->ymin);
FrameBuffer_setclip(p2->frame,vxmin,vymin,vxmax,vymax);
}
}
/* -------------------------------------------------------------------------------
Plot2D_setrange(Plot2D *p2, double xmin, double ymin, double xmax, double ymax)
Sets the plotting range.
------------------------------------------------------------------------------- */
void
Plot2D_setrange(Plot2D *p2, double xmin, double ymin, double xmax, double ymax) {
if (p2) {
p2->xmin = xmin;
p2->ymin = ymin;
p2->xmax = xmax;
p2->ymax = ymax;
p2->dx = (p2->view_xmax - p2->view_xmin)/(p2->xmax - p2->xmin);
p2->dy = (p2->view_ymax - p2->view_ymin)/(p2->ymax - p2->ymin);
}
}
/* -------------------------------------------------------------------------------
Plot2D_setscale(Plot2D *p2, int xscale, int yscale)
Sets the plotting scaling method
------------------------------------------------------------------------------- */
void
Plot2D_setscale(Plot2D *p2, int xscale, int yscale) {
if (p2) {
p2->xscale = xscale;
p2->yscale = yscale;
}
}
/* ----------------------------------------------------------------------------
Plot2D_transform(Plot2D *p2, double x, double y, int *px, int *py)
Transforms x,y into screen coordinates px and py. Result is returned
in px and py. Rounds to the nearest pixel instead of truncating.
----------------------------------------------------------------------------- */
void
Plot2D_transform(Plot2D *p2, double x, double y, int *px, int *py) {
if (p2) {
*px = p2->view_xmin + (int) (p2->dx*(x-p2->xmin) + 0.5);
*py = p2->view_ymin + (int) (p2->dy*(y-p2->ymin) + 0.5);
}
}
/* -------------------------------------------------------------------------------
Plot2D_plot(Plot2D *p2, double x, double y, Pixel color)
Plot a 2D Point of a given color
------------------------------------------------------------------------------- */
void
Plot2D_plot(Plot2D *p2, double x, double y, Pixel color) {
int px, py;
Plot2D_transform(p2,x,y,&px,&py);
FrameBuffer_plot(p2->frame, px, py, color);
}
/* -------------------------------------------------------------------------------
Plot2D_box(Plot2D *p2, double x1, double y1, double x2, double y2, Pixel Color)
Plot an outline box on the 2D plot
------------------------------------------------------------------------------- */
void
Plot2D_box(Plot2D *p2, double x1, double y1,double x2, double y2, Pixel color) {
int ix1, ix2,iy1, iy2;
Plot2D_transform(p2,x1,y1,&ix1,&iy1);
Plot2D_transform(p2,x2,y2,&ix2,&iy2);
FrameBuffer_box(p2->frame,ix1,iy1,ix2,iy2,color);
}
/* -------------------------------------------------------------------------------
Plot2D_solidbox(Plot2D *p2, double x1, double y1, double x2, double y2, Pixel Color)
Plot a solid box box on the 2D plot
------------------------------------------------------------------------------- */
void
Plot2D_solidbox(Plot2D *p2, double x1, double y1,double x2, double y2, Pixel color) {
int ix1, ix2,iy1, iy2;
Plot2D_transform(p2,x1,y1,&ix1,&iy1);
Plot2D_transform(p2,x2,y2,&ix2,&iy2);
FrameBuffer_solidbox(p2->frame,ix1,iy1,ix2,iy2,color);
}
/* -------------------------------------------------------------------------------
Plot2D_interpbox(Plot2D *p2, double x1, double y1, double x2, double y2,
Pixel c1, Pixel c2, Pixel c3, Pixel c4)
Plot a color-interpolated box on the 2D plot
------------------------------------------------------------------------------- */
void
Plot2D_interpbox(Plot2D *p2, double x1, double y1,double x2, double y2,
Pixel c1, Pixel c2, Pixel c3, Pixel c4) {
int ix1, ix2,iy1, iy2;
Plot2D_transform(p2,x1,y1,&ix1,&iy1);
Plot2D_transform(p2,x2,y2,&ix2,&iy2);
FrameBuffer_interpbox(p2->frame,ix1,iy1,ix2,iy2,c1,c2,c3,c4);
}
/* -------------------------------------------------------------------------------
Plot2D_circle(Plot2D *p2, double x, double y, double radius, Pixel color)
Make an outline circle on the 2D plot.
------------------------------------------------------------------------------- */
void
Plot2D_circle(Plot2D *p2, double x, double y, double radius, Pixel color) {
int ix, iy, ir;
Plot2D_transform(p2,x,y,&ix,&iy);
ir = p2->dx * radius; /* This is really incorrect. Will need ellipse */
if (ir > 1)
FrameBuffer_circle(p2->frame,ix,iy,ir,color);
else
FrameBuffer_plot(p2->frame,ix,iy,color);
}
/* -------------------------------------------------------------------------------
Plot2D_solidcircle(Plot2D *p2, double x, double y, double radius, Pixel color)
Make an solid circle on the 2D plot.
------------------------------------------------------------------------------- */
void
Plot2D_solidcircle(Plot2D *p2, double x, double y, double radius, Pixel color) {
int ix, iy, ir;
Plot2D_transform(p2,x,y,&ix,&iy);
ir = p2->dx * radius; /* This is really incorrect. Will need ellipse */
if (ir > 1)
FrameBuffer_solidcircle(p2->frame,ix,iy,ir,color);
else
FrameBuffer_plot(p2->frame,ix,iy,color);
}
/* -------------------------------------------------------------------------------
Plot2D_line(Plot2D *p2, double x1, double y1, double x2, double y2, Pixel color)
Draw a line
------------------------------------------------------------------------------- */
void
Plot2D_line(Plot2D *p2, double x1, double y1, double x2, double y2, Pixel color) {
int ix1, ix2, iy1, iy2;
Plot2D_transform(p2,x1,y1,&ix1,&iy1);
Plot2D_transform(p2,x2,y2,&ix2,&iy2);
FrameBuffer_line(p2->frame,ix1,iy1,ix2,iy2,color);
}
/* -------------------------------------------------------------------------------
Plot2D_start(Plot2D *p2)
This should be called before starting to make a 2D plot. It will change
the viewport coordinates for the framebuffer and do other stuff.
------------------------------------------------------------------------------- */
void Plot2D_start(Plot2D *p2) {
if (p2) {
FrameBuffer_setclip(p2->frame, p2->view_xmin,p2->view_ymin,p2->view_xmax, p2->view_ymax);
p2->dx = (p2->view_xmax - p2->view_xmin)/(p2->xmax - p2->xmin);
p2->dy = (p2->view_ymax - p2->view_ymin)/(p2->ymax - p2->ymin);
}
}
/* --------------------------------------------------------------------------
void Plot2D_drawpixmap(Plot2D *p2, PixMap *pm, double x, double y, Pixel color, Pixel bgcolor)
Draw a pixel map at the given coordinates. (Used for putting symbols on 2D
plots).
-------------------------------------------------------------------------- */
void
Plot2D_drawpixmap(Plot2D *p2, PixMap *pm, double x, double y, Pixel color, Pixel bgcolor) {
int ix, iy;
Plot2D_transform(p2,x,y,&ix,&iy);
FrameBuffer_drawpixmap(p2->frame,pm,ix,iy,color,bgcolor);
}
/* ----------------------------------------------------------------------------
void Plot2D_xaxis(Plot2D *p2, double x, double y, double xtick, int ticklength, Pixel color)
Draw an X axis bar at location x,y with ticks spaced every xtick units.
Ticks are spaced starting at "x"
----------------------------------------------------------------------------- */
void Plot2D_xaxis(Plot2D *p2, double x, double y, double xtick, int ticklength, Pixel color) {
int ix, iy,iy2;
double xt;
/* Draw a line fox the axis */
Plot2D_line(p2,p2->xmin,y,p2->xmax,y,color);
xt = x;
while (xt >= p2->xmin) {
Plot2D_transform(p2,xt,y,&ix,&iy);
iy2 = iy+ticklength;
iy = iy-ticklength;
FrameBuffer_line(p2->frame,ix,iy,ix,iy2,color);
xt = xt - xtick;
}
xt = x + xtick;
while (xt < p2->xmax) {
Plot2D_transform(p2,xt,y,&ix,&iy);
iy2 = iy+ticklength;
iy = iy-ticklength;
FrameBuffer_line(p2->frame,ix,iy,ix,iy2,color);
xt = xt + xtick;
}
}
/* ----------------------------------------------------------------------------
void Plot2D_yaxis(Plot2D *p2, double x, double y, double ytick, int ticklength, Pixel c)
Draw an Y axis bar at location x,y with ticks spaced every xtick units.
Ticks are spaced starting at "y"
----------------------------------------------------------------------------- */
void Plot2D_yaxis(Plot2D *p2, double x, double y, double ytick, int ticklength, Pixel color) {
int ix, iy, ix2;
double yt;
/* Draw a line fox the axis */
Plot2D_line(p2,x,p2->ymin,x,p2->ymax,color);
yt = y;
while (yt >= p2->ymin) {
Plot2D_transform(p2,x,yt,&ix,&iy);
ix2 = ix+ticklength;
ix = ix-ticklength;
FrameBuffer_line(p2->frame,ix,iy,ix2,iy,color);
yt = yt - ytick;
}
yt = y + ytick;
while (yt < p2->ymax) {
Plot2D_transform(p2,x,yt,&ix,&iy);
ix2 = ix+ticklength;
ix = ix-ticklength;
FrameBuffer_line(p2->frame,ix,iy,ix2,iy,color);
yt = yt + ytick;
}
}
/* -------------------------------------------------------------------------
Plot2D_triangle(Plot2D *p2, double x1, double y1,
double x2, double y2,
double x3, double y3,
Pixel fillcolor)
This function draws a 2D outline triangle.
-------------------------------------------------------------------------- */
void Plot2D_triangle(Plot2D *p2, double x1, double y1,
double x2, double y2,
double x3, double y3, Pixel color) {
Plot2D_line(p2,x1,y1,x2,y2,color);
Plot2D_line(p2,x2,y2,x3,y3,color);
Plot2D_line(p2,x3,y3,x1,y1,color);
}
/* -------------------------------------------------------------------------
Plot2D_solidtriangle(Plot2D *p2, double x1, double y1,
double x2, double y2,
double x3, double y3,
Pixel color)
This function draws a 2D filled triangle. Can be used to
draw other primitives such as quadralaterals, etc...
-------------------------------------------------------------------------- */
void Plot2D_solidtriangle(Plot2D *p2, double x1, double y1,
double x2, double y2,
double x3, double y3, Pixel color) {
int tx1, tx2, tx3, ty1, ty2, ty3;
/* Transform the three points into screen coordinates */
Plot2D_transform(p2,x1,y1,&tx1,&ty1);
Plot2D_transform(p2,x2,y2,&tx2,&ty2);
Plot2D_transform(p2,x3,y3,&tx3,&ty3);
FrameBuffer_solidtriangle(p2->frame,tx1,ty1,tx2,ty2,tx3,ty3,color);
}
/* -------------------------------------------------------------------------
Plot2D_interptriangle(Plot2D *p2, double x1, double y1, Pixel c1,
double x2, double y2, Pixel c2,
double x3, double y3, Pixel c3);
This function draws a 2D filled triangle with color interpolation.
Can be used to draw other primitives such as quadralaterals, etc...
-------------------------------------------------------------------------- */
void Plot2D_interptriangle(Plot2D *p2, double x1, double y1, Pixel c1,
double x2, double y2, Pixel c2,
double x3, double y3, Pixel c3) {
int tx1, tx2, tx3, ty1, ty2, ty3;
/* Transform the three points into screen coordinates */
Plot2D_transform(p2,x1,y1,&tx1,&ty1);
Plot2D_transform(p2,x2,y2,&tx2,&ty2);
Plot2D_transform(p2,x3,y3,&tx3,&ty3);
FrameBuffer_interptriangle(p2->frame,tx1,ty1,c1,tx2,ty2,c2,tx3,ty3,c3);
}
