You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
83 lines
4.2 KiB
83 lines
4.2 KiB
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
|
|
<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/doc/canvas.doc:36 -->
|
|
<html>
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
|
<title>Canvas Module</title>
|
|
<style type="text/css"><!--
|
|
fn { margin-left: 1cm; text-indent: -1cm; }
|
|
a:link { color: #004faf; text-decoration: none }
|
|
a:visited { color: #672967; text-decoration: none }
|
|
body { background: #ffffff; color: black; }
|
|
--></style>
|
|
</head>
|
|
<body>
|
|
|
|
<table border="0" cellpadding="0" cellspacing="0" width="100%">
|
|
<tr bgcolor="#E5E5E5">
|
|
<td valign=center>
|
|
<a href="index.html">
|
|
<font color="#004faf">Home</font></a>
|
|
| <a href="classes.html">
|
|
<font color="#004faf">All Classes</font></a>
|
|
| <a href="mainclasses.html">
|
|
<font color="#004faf">Main Classes</font></a>
|
|
| <a href="annotated.html">
|
|
<font color="#004faf">Annotated</font></a>
|
|
| <a href="groups.html">
|
|
<font color="#004faf">Grouped Classes</font></a>
|
|
| <a href="functions.html">
|
|
<font color="#004faf">Functions</font></a>
|
|
</td>
|
|
<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Canvas Module</h1>
|
|
|
|
|
|
|
|
<p>
|
|
<p> The canvas module provides a highly optimized 2D graphic area called
|
|
<a href="qcanvas.html">TQCanvas</a>. The canvas can contain an arbitrary number of <a href="qcanvasitem.html">TQCanvasItems</a>. Canvas items can have an arbitrary
|
|
shape, size and content, can be freely moved around in the canvas,
|
|
and can be checked for collisions. Canvas items can be set to move
|
|
across the canvas automatically and animated canvas items are
|
|
supported with <a href="qcanvassprite.html">TQCanvasSprite</a>. (If you require 3D graphics see TQt's
|
|
<a href="opengl.html">OpenGL module</a>.)
|
|
<p> The canvas module uses a document/view model. The <a href="qcanvasview.html">TQCanvasView</a> class
|
|
is used to show a particular view of a canvas. Multiple views can operate
|
|
on the same canvas at the same time. Every view can use an arbitrary
|
|
<a href="qwmatrix.html#TransformationMode">transformation matrix</a> on the canvas which makes it easy to implement
|
|
features such as zooming.
|
|
<p> <center><a href="qcanvas.html">
|
|
<img src="qcanvas.png" alt="Screenshot of a canvas"></a></center>
|
|
<p> TQt provides a number of predefined <a href="qcanvas.html">TQCanvas</a> items as listed below.
|
|
<p> <ul>
|
|
<li> <a href="qcanvasitem.html">TQCanvasItem</a> -- An abstract base class for all canvas items.
|
|
<li> <a href="qcanvasellipse.html">TQCanvasEllipse</a> -- An ellipse or "pie segment".
|
|
<li> <a href="qcanvasline.html">TQCanvasLine</a> -- A line segment.
|
|
<li> <a href="qcanvaspolygon.html">TQCanvasPolygon</a> -- A polygon.
|
|
<li> <a href="qcanvaspolygonalitem.html">TQCanvasPolygonalItem</a> -- A base class for items that have a
|
|
non-rectangular shape. Most canvas items derive from this class.
|
|
<li> <a href="qcanvasrectangle.html">TQCanvasRectangle</a> -- A rectangle. The rectangle cannot be tilted or
|
|
rotated. Rotated rectangles can be drawn using TQCanvasPolygon.
|
|
<li> <a href="qcanvasspline.html">TQCanvasSpline</a> -- A multi-bezier spline.
|
|
<li> <a href="qcanvassprite.html">TQCanvasSprite</a> -- An animated pixmap.
|
|
<li> <a href="qcanvastext.html">TQCanvasText</a> -- A text string.
|
|
</ul>
|
|
<p> The two classes <a href="qcanvaspixmap.html">TQCanvasPixmap</a> and <a href="qcanvaspixmaparray.html">TQCanvasPixmapArray</a> are used
|
|
by <a href="qcanvassprite.html">TQCanvasSprite</a> to show animated and moving pixmaps on the
|
|
canvas.
|
|
<p> More specialized items can be created by inheriting from one of the
|
|
canvas item classes. It is easiest to inherit from one of
|
|
<a href="qcanvasitem.html">TQCanvasItem</a>'s derived classes (usually <a href="qcanvaspolygonalitem.html">TQCanvasPolygonalItem</a>) rather
|
|
than inherit TQCanvasItem directly.
|
|
<p> See <tt>examples/canvas</tt> for an example that shows off some of <a href="qcanvas.html">TQCanvas</a>'s
|
|
capabilities.
|
|
<p>
|
|
<!-- eof -->
|
|
<p><address><hr><div align=center>
|
|
<table width=100% cellspacing=0 border=0><tr>
|
|
<td>Copyright © 2007
|
|
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
|
<td align=right><div align=right>TQt 3.3.8</div>
|
|
</table></div></address></body>
|
|
</html>
|