📄 c++ builder 程序设计实用教程 - 6_3_1 绘制直线的子窗体设计 - 张晋 - 17xie.htm
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<H3><A name=_Toc502915332></A><A name=_Toc499459732></A><A
name=_Toc496446667></A><A name=_Toc496438906></A><st1:chsdate w:st="on"
IsROCDate="False" IsLunarDate="False" Day="30" Month="12" Year="1899"><SPAN
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style="mso-bookmark: _Toc499459732"><SPAN
style="mso-bookmark: _Toc502915332"><SPAN
lang=EN-US>6.3.1</SPAN></SPAN></SPAN></SPAN></SPAN></st1:chsdate><SPAN
style="mso-bookmark: _Toc496438906"><SPAN
style="mso-bookmark: _Toc496446667"><SPAN
style="mso-bookmark: _Toc499459732"><SPAN
style="mso-bookmark: _Toc502915332"><SPAN lang=EN-US><SPAN
style="mso-spacerun: yes"> </SPAN></SPAN></SPAN></SPAN></SPAN></SPAN><SPAN
style="mso-bookmark: _Toc496438906"><SPAN
style="mso-bookmark: _Toc496446667"><SPAN
style="mso-bookmark: _Toc499459732"><SPAN
style="mso-bookmark: _Toc502915332"><SPAN
style="FONT-FAMILY: 黑体; mso-ascii-font-family: 'Times New Roman'">绘制直线的子窗体设计</SPAN></SPAN></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，我们继续添加绘制直线的子窗体，这个窗体的作用是：当用户在窗体上单击鼠标的左键时，程序就会调用相应的方法在窗体上绘制一条由上一个鼠标单击点到当前鼠标单击点的直线，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'">．新建窗体</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。在本项目的基础上，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 Form</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</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，在控件工具栏上选择“</SPAN><SPAN
lang=EN-US>Standart</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">”选项后，在“</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'">”控件的图标上双击鼠标的左键，这时空白的窗体上就会出现一个按钮控件，添加控件后的窗体如图</SPAN><SPAN
lang=EN-US>6-8</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><SPAN lang=EN-US><IMG height=189
src="C++ Builder 程序设计实用教程 - 6_3_1 绘制直线的子窗体设计 - 张晋 - 17xie.files/2afb0058df.jpg"
width=267 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>6-8<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'">绘制直线的子窗体</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'">在程序的设计过程中，用鼠标的左键双击窗体上的按钮控件，在屏幕上就会弹出一个代码窗口，把光标移动到控件和窗体的相应事件过程中，并且按照下面的程序清单添加程序代码：</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
<vcl.h><o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'">#pragma
hdrstop<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'">#include
"Line.h"<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'">#pragma
package(smart_init)<o:p></o:p></SPAN></P>
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