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20.4 绘制可滚动的窗口
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20.4 绘制可滚动的窗口
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<div style='float:left;width:49%'>·<a href='100165567.htm'>20.2.3 Rectangle和RectangleF结构</a></div><div style='float:right;width:49%'>·<a href='100165568.htm'>20.2.4 Region</a></div><div style='float:left;width:49%'>·<a href='100165569.htm'>20.3 调试须知</a></div><div style='float:right;width:49%'>·<a href='100165571.htm'>20.5 颜色</a></div><div style='float:left;width:49%'>·<a href='100165572.htm'>20.5.1 红绿蓝(RGB)值</a></div><div style='float:right;width:49%'>·<a href='100165573.htm'>20.5.2 命名的颜色</a></div></div>
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><h3 style="MARGIN-TOP: 11.4pt; MARGIN-LEFT: 0cm; MARGIN-RIGHT: 0cm; FTEL: 11.4pt"><a ftel="_Toc507815363"><span lang="EN-US">20.4 </span></a><span style="FONT-FAMILY: 楷体_GB2312">绘制可滚动的窗口</span></h3>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">前面的</span><span lang="EN-US">DrawShapes</span><span style="FONT-FAMILY: 宋体">示例运行良好，因为需要绘制的内容正好适合最初的窗口大小。本节介绍如果绘制的内容不适合窗口的大小，需要做哪些工作。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">下面扩展</span><span lang="EN-US">DrawShapes</span><span style="FONT-FAMILY: 宋体">示例，以解释滚动的概念。为了使该示例更符合实际，首先创建一个</span><span lang="EN-US">BigShapes</span><span style="FONT-FAMILY: 宋体">示例，该示例将矩形和椭圆画大一些。此时将使用</span><span lang="EN-US">Point</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">Size </span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US"> Rectangle</span><span style="FONT-FAMILY: 宋体">结构定义绘图区域，说明如何使用它们。进行了这样的修改后，</span><span lang="EN-US">Form1</span><span style="FONT-FAMILY: 宋体">类的相关部分如下所示：</span></p>
<p class="2" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US"> // member fields</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> private Point rectangleTopLeft = new Point(0, 0);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> private Size rectangleSize = new Size(200,200);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> private Point ellipseTopLeft = new Point(50, 200);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US"> private Size ellipseSize = new Size(200, 150);</span></p>
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