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<H3><A name=_Toc502915333></A><A name=_Toc499459733></A><A 
name=_Toc496446668></A><A name=_Toc496438907></A><st1:chsdate w:st="on" 
IsROCDate="False" IsLunarDate="False" Day="30" Month="12" Year="1899"><SPAN 
style="mso-bookmark: _Toc496438907"><SPAN 
style="mso-bookmark: _Toc496446668"><SPAN 
style="mso-bookmark: _Toc499459733"><SPAN 
style="mso-bookmark: _Toc502915333"><SPAN 
lang=EN-US>6.3.2</SPAN></SPAN></SPAN></SPAN></SPAN></st1:chsdate><SPAN 
style="mso-bookmark: _Toc496438907"><SPAN 
style="mso-bookmark: _Toc496446668"><SPAN 
style="mso-bookmark: _Toc499459733"><SPAN 
style="mso-bookmark: _Toc502915333"><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes">&nbsp; </SPAN></SPAN></SPAN></SPAN></SPAN></SPAN><SPAN 
style="mso-bookmark: _Toc496438907"><SPAN 
style="mso-bookmark: _Toc496446668"><SPAN 
style="mso-bookmark: _Toc499459733"><SPAN 
style="mso-bookmark: _Toc502915333"><SPAN 
style="FONT-FAMILY: 黑体; mso-ascii-font-family: 'Times New Roman'">绘制椭圆的子窗体</SPAN></SPAN></SPAN></SPAN></SPAN><SPAN 
style="mso-bookmark: _Toc499459733"><SPAN 
style="mso-bookmark: _Toc502915333"><SPAN 
style="FONT-FAMILY: 黑体; mso-ascii-font-family: 'Times New Roman'">设计</SPAN></SPAN></SPAN></H3>
<P class=MsoNormalIndent><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">下面，我们再创建用于绘制椭圆的子窗体，它的作用是：当用户在子窗体上按下并且移动鼠标时，程序就会调用相应的方法在窗体上绘制一个椭具体的程序设计步骤如下：</SPAN></P>
<H4><SPAN lang=EN-US>1</SPAN><SPAN 
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">．建立窗体</SPAN></H4>
<P class=MsoNormalIndent><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">首先启动一个新的项目，选择菜单“</SPAN><SPAN 
lang=EN-US>File</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">”中的“</SPAN><SPAN 
lang=EN-US>New Application</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">”项，在</SPAN><SPAN 
class=SpellE><SPAN lang=EN-US>CBuilder</SPAN></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的集成开发环境中就会弹出一个新建的窗体。</SPAN></P>
<P class=a><SPAN lang=EN-US><IMG height=137 
src="C++ Builder 程序设计实用教程 - 6_3_2 绘制椭圆的子窗体设计 - 张晋 - 17xie.files/b9a047757b.jpg" 
width=191 v:shapes="_x0000_i1025"></SPAN></P>
<P class=MsoCaption><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图</SPAN><SPAN 
lang=EN-US>6-9<SPAN style="mso-spacerun: yes">&nbsp; </SPAN></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">绘制椭圆子窗体</SPAN></P>
<H4><SPAN lang=EN-US>2</SPAN><SPAN 
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">．添加代码</SPAN></H4>
<P class=MsoNormalIndent><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在程序的设计过程用鼠标的左键双击窗体的空白处，在屏幕上就会弹出一个代码窗口，把光标移动到到代码段中的适当位置，并且添加如下绘制绘制椭圆的代码：</SPAN></P>
<DIV 
style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 0cm; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 0cm; PADDING-BOTTOM: 1pt; BORDER-LEFT: windowtext 1pt solid; PADDING-TOP: 1pt; BORDER-BOTTOM: windowtext 1pt solid; mso-border-alt: solid windowtext .5pt; mso-element: para-border-div">
<P class=a0 
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0cm; BORDER-TOP: medium none; PADDING-LEFT: 0cm; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; PADDING-TOP: 0cm; BORDER-BOTTOM: medium none; mso-border-alt: solid windowtext .5pt; mso-padding-alt: 1.0pt 0cm 1.0pt 0cm"><SPAN 
style="FONT-FAMILY: 仿宋_GB2312; mso-ascii-font-family: 'Times New Roman'">程序清单</SPAN></P></DIV>
<P class=a1><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">//-----------------------------------------------------------------------<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'">#include 
&lt;<SPAN class=SpellE>vcl.h</SPAN>&gt;<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'">#<SPAN 
class=SpellE>pragma</SPAN> <SPAN 
class=SpellE>hdrstop</SPAN><o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'"><o:p>&nbsp;</o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'">#include 
"<SPAN class=SpellE>Ellipse.h</SPAN>"<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">//-----------------------------------------------------------------------<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'">#<SPAN 
class=SpellE>pragma</SPAN> package(<SPAN 
class=SpellE>smart_init</SPAN>)<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'">#<SPAN 
class=SpellE>pragma</SPAN> resource "*.<SPAN 
class=SpellE>dfm</SPAN>"<o:p></o:p></SPAN></P>
<P class=a1><SPAN class=SpellE><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">TForm_Ellipse</SPAN></SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"> *<SPAN 
class=SpellE>Form_Ellipse</SPAN>;<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'">Boolean 
Start;<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">//</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">定义标志变量</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">//---------------------------------------------------------------------------<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'">__<SPAN
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