📄 c++ builder 程序设计实用教程 - 4_2_2 利用鼠标绘制图形 - 张晋 - 17xie.htm
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<H3><A name=_Toc502915259></A><A name=_Toc392380663></A><st1:chsdate Year="1899"
Month="12" Day="30" IsLunarDate="False" IsROCDate="False" w:st="on"><SPAN
style="mso-bookmark: _Toc392380663"><SPAN
style="mso-bookmark: _Toc502915259"><SPAN
lang=EN-US>4.2.2</SPAN></SPAN></SPAN></st1:chsdate><SPAN
style="mso-bookmark: _Toc392380663"><SPAN
style="mso-bookmark: _Toc502915259"><SPAN lang=EN-US><SPAN
style="mso-spacerun: yes"> </SPAN></SPAN></SPAN></SPAN><SPAN
style="mso-bookmark: _Toc392380663"><SPAN
style="mso-bookmark: _Toc502915259"><SPAN
style="FONT-FAMILY: 黑体; mso-ascii-font-family: 'Times New Roman'; mso-no-proof: yes">利用鼠标绘制图形</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'">在图形图像处理的应用程序中，我们经常是利用鼠标来绘制图形，所以鼠标在图形处理中占有重要的地位，下面就通过一个示例应用程序来说明在图形处理应用程序中如何对鼠标的动作作出正确的响应，具体的程序设计步骤如下所示。</SPAN></P>
<H4><SPAN lang=EN-US>1</SPAN><SPAN
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">．开始工作</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
lang=EN-US>CBuilder 5</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，在组件工具栏上选择</SPAN><SPAN
lang=EN-US>Standard</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">选项后，选中</SPAN><SPAN
lang=EN-US>Button</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">组件，并且向窗体上添加三个</SPAN><SPAN
lang=EN-US>Button</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">组件和一个标签、四个</SPAN><SPAN
lang=EN-US>RadioButton</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">组件，然后在组件工具栏上选择</SPAN><SPAN
lang=EN-US>Additional</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">选项，并且把一个</SPAN><SPAN
lang=EN-US>Image</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">组件添加到窗体上，添加组件后的窗体如图</SPAN><SPAN
lang=EN-US>4-9</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所示。</SPAN></P>
<P class=a style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US><IMG height=201
src="C++ Builder 程序设计实用教程 - 4_2_2 利用鼠标绘制图形 - 张晋 - 17xie.files/22e67fc7d7.jpg"
width=302 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>4-9<SPAN style="mso-spacerun: yes"> </SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">添加组件后的窗体</SPAN></P>
<P class=MsoNormalIndent><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">其中窗体上各个组件的属性设置如下所示：</SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'">object
Form1: TForm1<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-spacerun: yes"> </SPAN>Left = 269<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-spacerun: yes"> </SPAN>Top = 111<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-spacerun: yes"> </SPAN>Width = 403<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-spacerun: yes"> </SPAN>Height = 308<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-spacerun: yes"> </SPAN>Caption = 'Form1'<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-spacerun: yes"> </SPAN>OnCreate =
FormCreate<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-spacerun: yes"> </SPAN>object Image1:
TImage<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-spacerun: yes"> </SPAN>Left =
8<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-spacerun: yes"> </SPAN>Top =
8<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-spacerun: yes"> </SPAN>Width =
265<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-spacerun: yes"> </SPAN>Height =
265<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-spacerun: yes"> </SPAN>Stretch =
True<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-spacerun: yes"> </SPAN>OnMouseDown =
Image1MouseDown<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-spacerun: yes"> </SPAN>OnMouseMove =
Image1MouseMove<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><SPAN
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