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<title>Evas: Coordinate Mapping Functions</title>
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Evas Documentation <small>at Thu Jul 14 2011</small>
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<a href="#func-members">Functions</a> </div>
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<div class="title">Coordinate Mapping Functions</div> </div>
<div class="ingroups"><a class="el" href="group__Evas__Canvas.html">Canvas Functions</a></div></div>
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<p>Functions that are used to map coordinates from the canvas to the screen or the screen to the canvas.
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="func-members"></a>
Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">EAPI Evas_Coord </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Evas__Coord__Mapping__Group.html#gab435c4e98554a4c6b934840a38d96051">evas_coord_screen_x_to_world</a> (const <a class="el" href="group__Evas__Canvas.html#ga5ff87cc4ce6bc43e3b640a6d37f73043">Evas</a> *e, int x)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Convert/scale an ouput screen co-ordinate into canvas co-ordinates. <a href="#gab435c4e98554a4c6b934840a38d96051"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">EAPI Evas_Coord </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Evas__Coord__Mapping__Group.html#gac69db230ec0bd06f683e62665abe5df2">evas_coord_screen_y_to_world</a> (const <a class="el" href="group__Evas__Canvas.html#ga5ff87cc4ce6bc43e3b640a6d37f73043">Evas</a> *e, int y)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Convert/scale an ouput screen co-ordinate into canvas co-ordinates. <a href="#gac69db230ec0bd06f683e62665abe5df2"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">EAPI int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Evas__Coord__Mapping__Group.html#ga3e4f9f6af852df00de8c180f2e3919e9">evas_coord_world_x_to_screen</a> (const <a class="el" href="group__Evas__Canvas.html#ga5ff87cc4ce6bc43e3b640a6d37f73043">Evas</a> *e, Evas_Coord x)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Convert/scale a canvas co-ordinate into output screen co-ordinates. <a href="#ga3e4f9f6af852df00de8c180f2e3919e9"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">EAPI int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Evas__Coord__Mapping__Group.html#ga6c80c5dd33180044bcd200bb4739a2b8">evas_coord_world_y_to_screen</a> (const <a class="el" href="group__Evas__Canvas.html#ga5ff87cc4ce6bc43e3b640a6d37f73043">Evas</a> *e, Evas_Coord y)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Convert/scale a canvas co-ordinate into output screen co-ordinates. <a href="#ga6c80c5dd33180044bcd200bb4739a2b8"></a><br/></td></tr>
</table>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<p>Functions that are used to map coordinates from the canvas to the screen or the screen to the canvas. </p>
<hr/><h2>Function Documentation</h2>
<a class="anchor" id="gab435c4e98554a4c6b934840a38d96051"></a><!-- doxytag: member="evas_main.c::evas_coord_screen_x_to_world" ref="gab435c4e98554a4c6b934840a38d96051" args="(const Evas *e, int x)" -->
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<td class="memname">EAPI Evas_Coord evas_coord_screen_x_to_world </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="group__Evas__Canvas.html#ga5ff87cc4ce6bc43e3b640a6d37f73043">Evas</a> * </td>
<td class="paramname"><em>e</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>x</em> </td>
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<p>Convert/scale an ouput screen co-ordinate into canvas co-ordinates. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">e</td><td>The pointer to the Evas Canvas </td></tr>
<tr><td class="paramname">x</td><td>The screen/output x co-ordinate </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>The screen co-ordinate translated to canvas unit co-ordinates</dd></dl>
<p>This function takes in a horizontal co-ordinate as the <code>x</code> parameter and converts it into canvas units, accounting for output size, viewport size and location, returning it as the function return value. If <code>e</code> is invalid, the results are undefined.</p>
<p>Example: </p>
<div class="fragment"><pre class="fragment"> <span class="keyword">extern</span> <a class="code" href="group__Evas__Canvas.html#ga5ff87cc4ce6bc43e3b640a6d37f73043" title="An Evas canvas handle.">Evas</a> *evas;
<span class="keyword">extern</span> <span class="keywordtype">int</span> screen_x;
Evas_Coord canvas_x;
canvas_x = <a class="code" href="group__Evas__Coord__Mapping__Group.html#gab435c4e98554a4c6b934840a38d96051" title="Convert/scale an ouput screen co-ordinate into canvas co-ordinates.">evas_coord_screen_x_to_world</a>(evas, screen_x);
</pre></div>
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<a class="anchor" id="gac69db230ec0bd06f683e62665abe5df2"></a><!-- doxytag: member="evas_main.c::evas_coord_screen_y_to_world" ref="gac69db230ec0bd06f683e62665abe5df2" args="(const Evas *e, int y)" -->
<div class="memitem">
<div class="memproto">
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<td class="memname">EAPI Evas_Coord evas_coord_screen_y_to_world </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="group__Evas__Canvas.html#ga5ff87cc4ce6bc43e3b640a6d37f73043">Evas</a> * </td>
<td class="paramname"><em>e</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>y</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Convert/scale an ouput screen co-ordinate into canvas co-ordinates. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">e</td><td>The pointer to the Evas Canvas </td></tr>
<tr><td class="paramname">y</td><td>The screen/output y co-ordinate </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>The screen co-ordinate translated to canvas unit co-ordinates</dd></dl>
<p>This function takes in a vertical co-ordinate as the <code>y</code> parameter and converts it into canvas units, accounting for output size, viewport size and location, returning it as the function return value. If <code>e</code> is invalid, the results are undefined.</p>
<p>Example: </p>
<div class="fragment"><pre class="fragment"> <span class="keyword">extern</span> <a class="code" href="group__Evas__Canvas.html#ga5ff87cc4ce6bc43e3b640a6d37f73043" title="An Evas canvas handle.">Evas</a> *evas;
<span class="keyword">extern</span> <span class="keywordtype">int</span> screen_y;
Evas_Coord canvas_y;
canvas_y = <a class="code" href="group__Evas__Coord__Mapping__Group.html#gac69db230ec0bd06f683e62665abe5df2" title="Convert/scale an ouput screen co-ordinate into canvas co-ordinates.">evas_coord_screen_y_to_world</a>(evas, screen_y);
</pre></div>
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<a class="anchor" id="ga3e4f9f6af852df00de8c180f2e3919e9"></a><!-- doxytag: member="evas_main.c::evas_coord_world_x_to_screen" ref="ga3e4f9f6af852df00de8c180f2e3919e9" args="(const Evas *e, Evas_Coord x)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
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<td class="memname">EAPI int evas_coord_world_x_to_screen </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="group__Evas__Canvas.html#ga5ff87cc4ce6bc43e3b640a6d37f73043">Evas</a> * </td>
<td class="paramname"><em>e</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">Evas_Coord </td>
<td class="paramname"><em>x</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Convert/scale a canvas co-ordinate into output screen co-ordinates. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">e</td><td>The pointer to the Evas Canvas </td></tr>
<tr><td class="paramname">x</td><td>The canvas x co-ordinate </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>The output/screen co-ordinate translated to output co-ordinates</dd></dl>
<p>This function takes in a horizontal co-ordinate as the <code>x</code> parameter and converts it into output units, accounting for output size, viewport size and location, returning it as the function return value. If <code>e</code> is invalid, the results are undefined.</p>
<p>Example: </p>
<div class="fragment"><pre class="fragment"> <span class="keyword">extern</span> <a class="code" href="group__Evas__Canvas.html#ga5ff87cc4ce6bc43e3b640a6d37f73043" title="An Evas canvas handle.">Evas</a> *evas;
<span class="keywordtype">int</span> screen_x;
<span class="keyword">extern</span> Evas_Coord canvas_x;
screen_x = <a class="code" href="group__Evas__Coord__Mapping__Group.html#ga3e4f9f6af852df00de8c180f2e3919e9" title="Convert/scale a canvas co-ordinate into output screen co-ordinates.">evas_coord_world_x_to_screen</a>(evas, canvas_x);
</pre></div>
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<a class="anchor" id="ga6c80c5dd33180044bcd200bb4739a2b8"></a><!-- doxytag: member="evas_main.c::evas_coord_world_y_to_screen" ref="ga6c80c5dd33180044bcd200bb4739a2b8" args="(const Evas *e, Evas_Coord y)" -->
<div class="memitem">
<div class="memproto">
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<td class="memname">EAPI int evas_coord_world_y_to_screen </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="group__Evas__Canvas.html#ga5ff87cc4ce6bc43e3b640a6d37f73043">Evas</a> * </td>
<td class="paramname"><em>e</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">Evas_Coord </td>
<td class="paramname"><em>y</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Convert/scale a canvas co-ordinate into output screen co-ordinates. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">e</td><td>The pointer to the Evas Canvas </td></tr>
<tr><td class="paramname">y</td><td>The canvas y co-ordinate </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>The output/screen co-ordinate translated to output co-ordinates</dd></dl>
<p>This function takes in a vertical co-ordinate as the <code>x</code> parameter and converts it into output units, accounting for output size, viewport size and location, returning it as the function return value. If <code>e</code> is invalid, the results are undefined.</p>
<p>Example: </p>
<div class="fragment"><pre class="fragment"> <span class="keyword">extern</span> <a class="code" href="group__Evas__Canvas.html#ga5ff87cc4ce6bc43e3b640a6d37f73043" title="An Evas canvas handle.">Evas</a> *evas;
<span class="keywordtype">int</span> screen_y;
<span class="keyword">extern</span> Evas_Coord canvas_y;
screen_y = <a class="code" href="group__Evas__Coord__Mapping__Group.html#ga6c80c5dd33180044bcd200bb4739a2b8" title="Convert/scale a canvas co-ordinate into output screen co-ordinates.">evas_coord_world_y_to_screen</a>(evas, canvas_y);
</pre></div>
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