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| author | scuri <scuri> | 2008-10-17 06:10:33 +0000 |
|---|---|---|
| committer | scuri <scuri> | 2008-10-17 06:10:33 +0000 |
| commit | 7b52cc13af4e85f1ca2deb6b6c77de9c95ea0dcf (patch) | |
| tree | d0857278bde2eff784227c57dcaf930346ceb7ac /html/en/func/polygon.html | |
First commit - moving from LuaForge to SourceForge
Diffstat (limited to 'html/en/func/polygon.html')
| -rw-r--r-- | html/en/func/polygon.html | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/html/en/func/polygon.html b/html/en/func/polygon.html new file mode 100644 index 0000000..4e18664 --- /dev/null +++ b/html/en/func/polygon.html @@ -0,0 +1,87 @@ +<!doctype HTML PUBLIC "-//IETF//DTD HTML//EN"> +<html> + +<head> +<meta http-equiv="Content-Language" content="en-us"> +<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> +<title>Polygons</title> +<link rel="stylesheet" type="text/css" href="../../style.css"> +</head> + +<body> + +<h2 align="center">Open, Closed and Filled Polygons,<br> +Bezier Lines and<br> +Regions Creation</h2> + + <p>The functions <font><strong>cdBegin</strong></font>, + <font><strong>cdVertex</strong></font> and <font> + <strong>cdEnd</strong></font> are use for many situations. + <font><strong>cdBegin</strong></font> is called once, + <font><strong>cdVertex</strong></font> can be called many + times, and <font><strong>cdEnd</strong></font> is called once + to actually do something. If you call <font><strong>cdBegin</strong></font> + again before <font><strong>cdEnd</strong></font> the process is + restarted, except for <strong><font>cdBegin(</font></strong><b>CD_REGION</b><strong><font>)</font></strong> + that can contains one or more polygons inside. </p> + +<hr> +<pre class="function"><span class="mainFunction">void <a name="cdBegin">cdCanvasBegin</a>(cdCanvas* canvas, int mode); [in C]</span> + +canvas:Begin(mode: number) [in Lua]</pre> + + <p>Starts defining a polygon to be drawn (or filled) according to the mode: + <b>CD_CLOSED_LINES</b>, <b>CD_OPEN_LINES</b>, <b>CD_FILL</b><strong><b>, + </b></strong><b>CD_CLIP, CD_REGION</b> or <strong><b>CD_BEZIER</b></strong>. + Do not create embedded polygons, that is, do not call function + <font><strong>cdBegin</strong></font> twice without a call to + <font><strong>cdEnd</strong></font> in between.</p> + +<ul> + <li><strong>CD_OPEN_LINES</strong><b>:</b> connects all the points at cdEnd. Depends + on line width and line style attributes. </li> + <li><b><b>CD_CLOSED_LINES:</b> </b>connects all the points at cdEnd and + connects the last point to the first. Depends on line width and line + style attributes. </li> + <li><b>CD_FILL:</b> connects the last point to the first and fills + the resulting polygon according to the current interior style. When the + interior style <strong><b>CD_HOLLOW</b></strong> is defined the it behaves + as if the mode were <b>CD_CLOSED_LINES</b><strong>.</strong></li> + <li><b>CD_CLIP: i</b>nstead of creating a polygon to be drawn, + creates a polygon to define a polygonal clipping region. </li> + <li><strong><b>CD_BEZIER:</b></strong><b> </b>defines the points of a bezier + curve. There must be at least 4 points: <i>start</i>, <i>control</i>, <i> + control</i> and <i>end</i>. To specify a sequence of curves use 3 more points + for each curve: <i>control</i>, <i>control</i>, <i>end</i>, <i>control</i>, <i> + control</i>, <i>end</i>, ... The end point is used as start point for the next + curve.</li> + <li><strong><b>CD_REGION</b></strong>: starts the creation of a complex + region for clipping. All calls to <font><strong>cdBox</strong></font>, + <font><strong>cdSector</strong></font>, <font> + <strong>cdChord, Filled</strong></font> <font><strong>Polygons</strong></font> + and <font><strong>cdText</strong></font> will be composed in a + region for clipping. See <a href="region.html">Regions</a> documentation.</li> +</ul> +<p align="center"><font size="4">Open, Closed and Filled Polygons<br> +</font><img src="../../img/polygon.gif" border="2" width="249" height="116"></p> +<p align="center"><font size="4">Bezier Lines<br> +</font><img src="../../img/bezier.gif" border="2" width="241" height="220"></p> +<pre class="function"><span class="mainFunction">void <a name="cdVertex">cdCanvasVertex</a>(cdCanvas* canvas, int x, int y); [in C]</span> +void cdfCanvasVertex(cdCanvas* canvas, double x, double y); [in C] +void wdCanvasVertex(cdCanvas* canvas, double x, double y); (WC) [in C] + +canvas:Vertex(x, y: number) [in Lua] +canvas:wVertex(x, y: number) (WC) [in Lua]</pre> + + <p>Adds a vertex to the polygon definition.</p> + +<pre class="function"><span class="mainFunction">void <a name="cdEnd">cdCanvasEnd</a>(cdCanvas* canvas); [in C]</span> + +canvas:End() [in Lua]</pre> + + <p>Ends the polygon's definition and draws it.</p> + + +</body> + +</html> |