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20.1 理解绘图规则
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C#高级编程（第3版）【全文连载】
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20.1 理解绘图规则
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2006-10-13 14:41:00
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<h1 id="divCurrentNode" style="color: #b83507; width: 100%; text-align: left; font-size: 12px; padding-left: 2px">当前章节:<a href='100165559.htm'><font color='red'>20.1 理解绘图规则</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165556.htm'>19.4.2 多文档界面</a></div><div style='float:right;width:49%'>·<a href='100165557.htm'>19.4.3 定制控件</a></div><div style='float:left;width:49%'>·<a href='100165558.htm'>19.5 小结</a></div><div style='float:right;width:49%'>·<a href='100165560.htm'>20.1.1 GDI和GDI+</a></div><div style='float:left;width:49%'>·<a href='100165561.htm'>20.1.2 绘制图形</a></div><div style='float:right;width:49%'>·<a href='100165562.htm'>20.1.3 使用OnPaint()绘制图形</a></div></div>
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><p class="MsoNormal"><span style="FONT-FAMILY: 宋体">在本书中，有</span><span lang="EN-US">3</span><span style="FONT-FAMILY: 宋体">章内容介绍用户交互和</span><span lang="EN-US">.NET Framework</span><span style="FONT-FAMILY: 宋体">，本章是这</span><span lang="EN-US">3</span><span style="FONT-FAMILY: 宋体">章中的第二章。在第</span><span lang="EN-US">19</span><span style="FONT-FAMILY: 宋体">章中，主要介绍了</span><span lang="EN-US">Windows</span><span style="FONT-FAMILY: 宋体">窗体、如何显示对话框或</span><span lang="EN-US">SDI</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">MDI</span><span style="FONT-FAMILY: 宋体">窗口，以及如何把各种控件放在这些窗口上，如按钮、文本框和列表框。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">标准控件的功能非常强大，使用它们就可以获得许多应用程序的完整用户界面。但是，有时还需要在用户界面上有更大的灵活性。例如，要在窗口的确定位置以给定的字体绘制文本，或者显示图像，但不使用图像框控件，只使用形状和图形。这些都不能使用第</span><span lang="EN-US">19</span><span style="FONT-FAMILY: 宋体">章中的控件来完成。要显示这种类型的输出，应用程序必须直接告诉操作系统需要在其窗口的什么地方显示什么内容。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">本章主要介绍如何绘制以下内容：</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-US">●<span style="FONT: 7pt "Times New Roman""> </span></span><span style="FONT-FAMILY: 宋体">直线、简单图形</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-US">●<span style="FONT: 7pt "Times New Roman""> </span></span><span lang="EN-US">.BMP</span><span style="FONT-FAMILY: 宋体">图像和其他图像文件</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-US">●<span style="FONT: 7pt "Times New Roman""> </span></span><span style="FONT-FAMILY: 宋体">文本</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">在这个过程中，还需要使用各种帮助对象，包括钢笔</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">用于定义直线的特性</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体">、画笔</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">用于定义区域的填充方式</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体">和字体</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">用于定义文本字符的图形</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体">。我们还将介绍设备如何解释和显示不同的颜色。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">下面首先讨论</span><span lang="EN-US">GDI+</span><span style="FONT-FAMILY: 宋体">技术。</span><span lang="EN-US">GDI+</span><span style="FONT-FAMILY: 宋体">由</span><span lang="EN-US">.NET</span><span style="FONT-FAMILY: 宋体">基类集组成，这些基类可用于在屏幕上完成定制绘图，能把合适的指令发送到图形设备的驱动程序上，确保在监视器屏幕上显示正确的输出</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">或显示到硬拷贝中</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体">。</span></p>
<h3 style="MARGIN-TOP: 11.4pt; MARGIN-LEFT: 0cm; MARGIN-RIGHT: 0cm; FTEL: 11.4pt"><a ftel="_Toc507815352"><span lang="EN-US">20.1 </span></a><span style="FONT-FAMILY: 楷体_GB2312">理解绘图规则</span></h3>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">本节讨论一些基本规则，只有理解了它们，才能开始在屏幕上绘图。首先概述</span><span lang="EN-US">GDI</span><span style="FONT-FAMILY: 宋体">，</span><span lang="EN-US">GDI+</span><span style="FONT-FAMILY: 宋体">技术就建立在</span><span lang="EN-US">GDI</span><span style="FONT-FAMILY: 宋体">上，然后说明它与</span><span lang="EN-US">GDI+</span><span style="FONT-FAMILY: 宋体">的关系。</span></p></div>
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<h1 id="divCurrentNode2" style="color: #b83507; width: 100%; text-align: left; font-size: 12px; padding-left: 2px">当前章节:<a href='100165559.htm'><font color='red'>20.1 理解绘图规则</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165556.htm'>19.4.2 多文档界面</a></div><div style='float:right;width:49%'>·<a href='100165557.htm'>19.4.3 定制控件</a></div><div style='float:left;width:49%'>·<a href='100165558.htm'>19.5 小结</a></div><div style='float:right;width:49%'>·<a href='100165560.htm'>20.1.1 GDI和GDI+</a></div><div style='float:left;width:49%'>·<a href='100165561.htm'>20.1.2 绘制图形</a></div><div style='float:right;width:49%'>·<a href='100165562.htm'>20.1.3 使用OnPaint()绘制图形</a></div></div>
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