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83 lines
4.1 KiB
83 lines
4.1 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/doc/canvas.doc:36 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Canvas Module</title>
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<font color="#004faf">All Classes</font></a>
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</td>
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<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>
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<p>
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<p> The canvas module provides a highly optimized 2D graphic area called
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<a href="qcanvas.html">QCanvas</a>. The canvas can contain an arbitrary number of <a href="qcanvasitem.html">QCanvasItems</a>. Canvas items can have an arbitrary
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shape, size and content, can be freely moved around in the canvas,
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and can be checked for collisions. Canvas items can be set to move
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across the canvas automatically and animated canvas items are
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supported with <a href="qcanvassprite.html">QCanvasSprite</a>. (If you require 3D graphics see Qt's
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<a href="opengl.html">OpenGL module</a>.)
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<p> The canvas module uses a document/view model. The <a href="qcanvasview.html">QCanvasView</a> class
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is used to show a particular view of a canvas. Multiple views can operate
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on the same canvas at the same time. Every view can use an arbitrary
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<a href="qwmatrix.html#TransformationMode">transformation matrix</a> on the canvas which makes it easy to implement
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features such as zooming.
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<p> <center><a href="qcanvas.html">
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<img src="qcanvas.png" alt="Screenshot of a canvas"></a></center>
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<p> Qt provides a number of predefined <a href="qcanvas.html">QCanvas</a> items as listed below.
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<p> <ul>
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<li> <a href="qcanvasitem.html">QCanvasItem</a> -- An abstract base class for all canvas items.
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<li> <a href="qcanvasellipse.html">QCanvasEllipse</a> -- An ellipse or "pie segment".
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<li> <a href="qcanvasline.html">QCanvasLine</a> -- A line segment.
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<li> <a href="qcanvaspolygon.html">QCanvasPolygon</a> -- A polygon.
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<li> <a href="qcanvaspolygonalitem.html">QCanvasPolygonalItem</a> -- A base class for items that have a
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non-rectangular shape. Most canvas items derive from this class.
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<li> <a href="qcanvasrectangle.html">QCanvasRectangle</a> -- A rectangle. The rectangle cannot be tilted or
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rotated. Rotated rectangles can be drawn using QCanvasPolygon.
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<li> <a href="qcanvasspline.html">QCanvasSpline</a> -- A multi-bezier spline.
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<li> <a href="qcanvassprite.html">QCanvasSprite</a> -- An animated pixmap.
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<li> <a href="qcanvastext.html">QCanvasText</a> -- A text string.
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</ul>
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<p> The two classes <a href="qcanvaspixmap.html">QCanvasPixmap</a> and <a href="qcanvaspixmaparray.html">QCanvasPixmapArray</a> are used
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by <a href="qcanvassprite.html">QCanvasSprite</a> to show animated and moving pixmaps on the
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canvas.
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<p> More specialized items can be created by inheriting from one of the
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canvas item classes. It is easiest to inherit from one of
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<a href="qcanvasitem.html">QCanvasItem</a>'s derived classes (usually <a href="qcanvaspolygonalitem.html">QCanvasPolygonalItem</a>) rather
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than inherit QCanvasItem directly.
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<p> See <tt>examples/canvas</tt> for an example that shows off some of <a href="qcanvas.html">QCanvas</a>'s
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capabilities.
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<p>
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<!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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