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20.2.3 Rectangle和RectangleF结构
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20.2.3 Rectangle和RectangleF结构
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<div style='float:left;width:49%'>·<a href='100165564.htm'>20.2 测量坐标和区域</a></div><div style='float:right;width:49%'>·<a href='100165565.htm'>20.2.1 Point和PointF结构</a></div><div style='float:left;width:49%'>·<a href='100165566.htm'>20.2.2 Size和SizeF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='100165570.htm'>20.4 绘制可滚动的窗口</a></div></div>
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><h3 style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 0cm; MARGIN-RIGHT: 0cm; FTEL: 8.15pt"><a ftel="_Toc507815360"><span lang="EN-US">20.2.3 Rectangle</span></a><span style="FONT-FAMILY: 黑体">和</span><span lang="EN-US">RectangleF</span><span style="FONT-FAMILY: 黑体">结构</span></h3>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">这两个结构表示一个矩形区域</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">通常在屏幕上</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体">。与</span><span lang="EN-US">Point </span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US"> Size</span><span style="FONT-FAMILY: 宋体">一样，这里只介绍</span><span lang="EN-US">Rectangle</span><span style="FONT-FAMILY: 宋体">结构，</span><span lang="EN-US">RectangleF</span><span style="FONT-FAMILY: 宋体">与</span><span lang="EN-US">Rectangle</span><span style="FONT-FAMILY: 宋体">基本相同，但它的属性类型是</span><span lang="EN-US">float</span><span style="FONT-FAMILY: 宋体">类型，而</span><span lang="EN-US">Rectangle</span><span style="FONT-FAMILY: 宋体">的属性类型是</span><span lang="EN-US">int</span><span style="FONT-FAMILY: 宋体">类型。</span></p>
<p class="MsoNormal"><span lang="EN-US">Rectangle</span><span style="FONT-FAMILY: 宋体">可以看作由一个</span><span lang="EN-US">Point </span><span style="FONT-FAMILY: 宋体">和一个</span><span lang="EN-US"> Size</span><span style="FONT-FAMILY: 宋体">组成，其中</span><span lang="EN-US">Point</span><span style="FONT-FAMILY: 宋体">表示矩形的左上角，</span><span lang="EN-US">Size</span><span style="FONT-FAMILY: 宋体">表示其大小。它的一个构造函数把</span><span lang="EN-US">Point </span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US"> Size</span><span style="FONT-FAMILY: 宋体">作为其参数。下面重新编写前面</span><span lang="EN-US">DrawShapes</span><span style="FONT-FAMILY: 宋体">示例的代码，绘制一个矩形：</span></p>
<p class="2" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US">Graphics dc = e.Graphics;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">Pen bluePen = new Pen(Color.Blue, 3);</span><span class="MsoCommentReference"><span lang="EN-US" style="DISPLAY: none; FONT-SIZE: 8pt; COLOR: black; LETTER-SPACING: 0.2pt"> </span></span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">Point topLeft = new Point(0,0);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">Size howBig = new Size(50,50);</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; FTEL: 18.45pt"><span lang="EN-US">Rectangle rectangleArea = new Rectangle(topLeft, howBig); </span></p>
<p class="2" style="MARGIN-TOP: 0cm; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US">dc.DrawRectangle(bluePen, rectangleArea);</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">这段代码也使用</span><span lang="EN-US">Graphics.DrawRectangle()</span><span style="FONT-FAMILY: 宋体">的另一个重载方法，它的参数是</span><span lang="EN-US">Pen</span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US"> Rectangle</span><span style="FONT-FAMILY: 宋体">结构。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">通过按顺序提供矩形的左上角水平和垂直坐标，宽度和高度</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">它们都是数字</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体">，可以构造一个</span><span lang="EN-US">Rectangle</span><span style="FONT-FAMILY: 宋体">：</span></p>
<p class="2" style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 21.45pt; MARGIN-RIGHT: 0cm; FTEL: 18.45pt"><span lang="EN-US">Rectangle rectangleArea = new Rectangle(0, 0, 50, 50)</span><span class="MsoCommentReference"><span lang="EN-GB" style="DISPLAY: none; FONT-SIZE: 8pt; LETTER-SPACING: 0.2pt">;</span></span></p>
<p class="MsoNormal"><span lang="EN-US">Rectangle</span><span style="FONT-FAMILY: 宋体">包含许多读写属性，如表</span><span lang="EN-US">20-3</span><span style="FONT-FAMILY: 宋体">所示，可以用不同的属性组合来设置或提取它的维数。</span></p>
<p class="a5" style="MARGIN-TOP: 8.15pt"><span style="FONT-FAMILY: 黑体">表</span><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'"> </span><span lang="EN-US">20-3</span></p>
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<p class="a2"><span style="FONT-FAMILY: 黑体">属</span><span lang="EN-US"> </span><span style="FONT-FAMILY: 黑体">性</span></p>
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<p class="a2"><span style="FONT-FAMILY: 黑体">说</span> <span lang="EN-US"> </span><span style="FONT-FAMILY: 黑体">明</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">int Left</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span style="FONT-FAMILY: 宋体">左边界的</span><span lang="EN-US">x</span><span style="FONT-FAMILY: 宋体">坐标</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">int Right</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span style="FONT-FAMILY: 宋体">右边界的</span><span lang="EN-US">x</span><span style="FONT-FAMILY: 宋体">坐标</span></p>
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