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📁 Visual C++面向对象程序设计教程(配套习题资源)
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<p style="line-height: 100%; margin-top: 0; margin-bottom: 0">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</p>
<p style="line-height: 100%; text-indent: 0; margin: 0" class="右标题" align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;                                                           
&nbsp;&nbsp;&nbsp; <span style="background-color: #CCFF99">第 18 章</span><span style="background-color: #CCFF99">&nbsp;                                                  
</span>&gt;<span style="background-color: #CCFF99"> 第 4 节 </span>&gt;<span style="background-color: #CCFF99">   
 18.4 常见的绘图任务</span></p>                    
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<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font LANG="ZH-CN" size="2">常见的绘图任务包括:输出文本、输出图形、输出图像等。</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">1.  
<font LANG="ZH-CN">输出文本</font></font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 10; margin-bottom: 0"><font LANG="ZH-CN" size="2">(1)  
文本输出要素</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2"><font LANG="ZH-CN">①</font><font LANG="ZH-CN">字体大小计算:通过调用</font>GetTextMetrics(  
)<font LANG="ZH-CN">返回当前使用字体的尺寸描述。</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2"><font LANG="ZH-CN">②</font></font><font LANG="ZH-CN" size="2">字体颜色设置:</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2"><font LANG="ZH-CN">&nbsp;&nbsp;&nbsp;&nbsp; 
设置前景色:</font>&nbsp; CDC::SetTextColor(int nColor);</font></p> 
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">&nbsp;&nbsp;&nbsp;&nbsp;  
<font LANG="ZH-CN">设置背景色:&nbsp;</font><font lang="ZH-CN"> </font>CDC::SetBkColor(int  
nColor);</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 10; margin-bottom: 0"><font LANG="ZH-CN" size="2">(2)  
文字输出函数</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2"><font LANG="ZH-CN">①  
</font>TextOut( )</font></p> 
<font SIZE="3">
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font size="2"><font LANG="ZH-CN">② 
</font>TabbedTextOut( )</font></p>
<font SIZE="3">
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font size="2"><font LANG="ZH-CN">③</font> 
ExtTextOut( )</font></p>
<font SIZE="3">
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font size="2"><span style="mso-bidi-font-size: 10.0pt; mso-bidi-font-family: Times New Roman; mso-font-kerning: 10.5pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">④ 
</span>DrawText( )</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 10; margin-bottom: 0"><font LANG="ZH-CN" size="2">(3)  
文本输出举例</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2"><font LANG="ZH-CN"><a href="example18-1.htm" target="_blank">【例</a></font><a href="example18-1.htm" target="_blank">18-1<font LANG="ZH-CN">】</font></a><font LANG="ZH-CN">在屏幕上显示如图</font>18-1<font LANG="ZH-CN">所示的文字。</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"> </p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">2.  
<font LANG="ZH-CN">输出图形</font></font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 10; margin-bottom: 0"><font LANG="ZH-CN" size="2">(1)  
画点&nbsp;</font><font size="2"><font lang="ZH-CN"> </font>SetPixel( )</font></p> 
<p ALIGN="justify" style="line-height: 100%; margin-top: 10; margin-bottom: 0"><font LANG="ZH-CN" size="2">(2)  
画线</font><font size="2"><font lang="ZH-CN">&nbsp; </font>MoveToEx( ) LineTo(  
)</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 10; margin-bottom: 0"><font lang="ZH-CN" size="2">(3)  
画弧&nbsp; Arc( )</font></p> 
<p ALIGN="justify" style="line-height: 100%; margin-top: 10; margin-bottom: 0"><font lang="ZH-CN" size="2">(4)  
封闭图形&nbsp; Rectangle( )、RoundRect( )、Ellipse( )等</font></p> 
<p ALIGN="justify" style="line-height: 100%; margin-top: 10; margin-bottom: 0"><font LANG="ZH-CN" size="2">(5)  
其它常用的绘图函数</font><font size="2"><font lang="ZH-CN">&nbsp; </font>FillRect(  
)、Draw3dRect( )等</font></p> 
<p ALIGN="justify" style="line-height: 100%; margin-top: 10; margin-bottom: 0"><font lang="ZH-CN" size="2">(</font><font LANG="ZH-CN" size="2">6)  
图形输出举例</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2"><font LANG="ZH-CN"><a href="example18-2.htm" target="_blank">【例</a></font><a href="example18-2.htm" target="_blank">18-2<font LANG="ZH-CN">】</font></a><font LANG="ZH-CN">在屏幕上显示如图</font>18-4<font LANG="ZH-CN">所示的图形。</font></font></p>
<blockquote>
  <blockquote>
  </blockquote>
</blockquote>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">3.  
<font LANG="ZH-CN">输出图像</font></font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 10; margin-bottom: 0"><font lang="ZH-CN" size="2">(</font><font LANG="ZH-CN" size="2">1)  
输出图像的步骤</font></p>
<font SIZE="3">
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font size="2"><font LANG="ZH-CN">①</font> 
<font LANG="ZH-CN">创建一个新的</font>CBitmap<font LANG="ZH-CN">对象。</font></font></p> 
<font SIZE="3">
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font size="2"><font LANG="ZH-CN">②</font> 
<font LANG="ZH-CN">将所需的位图图像文件和该对象关联。</font></font></p> 
<font SIZE="3">
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font size="2"><font LANG="ZH-CN">③</font> 
<font LANG="ZH-CN">将其选入用于显示的</font>DC<font LANG="ZH-CN">。</font></font></p> 
<font SIZE="3">
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font size="2"><font LANG="ZH-CN">④</font> 
<font LANG="ZH-CN">执行图像显示操作。</font></font></p> 
<p ALIGN="justify" style="line-height: 100%; margin-top: 10; margin-bottom: 0"><font LANG="ZH-CN" size="2">(2)  
输出图像使用的函数</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">CBitmap  
<font LANG="ZH-CN">类的成员函数有:</font></font></p>
<font SIZE="3">
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font size="2"><font LANG="ZH-CN">①</font> 
CBitmap( )<font LANG="ZH-CN">:</font>CBitmap<font LANG="ZH-CN">类的构造函数,用于创建一个</font>CBitmap<font LANG="ZH-CN">对象。</font></font></p> 
<font SIZE="3">
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font size="2"><font LANG="ZH-CN">②</font> 
LoadBitmap( )<font LANG="ZH-CN">:将已存在的位图资源与</font>CBitmap<font LANG="ZH-CN">对象关联。</font></font></p> 
<font SIZE="3">
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font LANG="ZH-CN" size="2">用法:</font></p>
<blockquote>
  <blockquote>
    <p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">LoadBitmap(  
    UINT nIDResource)</font></p> 
  </blockquote>
</blockquote>
<p ALIGN="justify" style="line-height: 100%; margin-top: 10; margin-bottom: 0"><font LANG="ZH-CN" size="2">(3)  
输出图像举例</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2"><font LANG="ZH-CN"><a href="example18-3.htm" target="_blank">【例</a></font><a href="example18-3.htm" target="_blank">18-3<font LANG="ZH-CN">】</font></a><font LANG="ZH-CN">在屏幕上显示如图</font>18-5<font LANG="ZH-CN">所示的图形。</font></font></p>

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