📄 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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<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'">#pragma
resource "*.dfm"<o:p></o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'">TForm_Line
*Form_Line;<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'">__fastcall
TForm_Line::TForm_Line(TComponent* Owner)<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>:
TForm(Owner)<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'">}<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'"><o:p> </o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'">void
__fastcall TForm_Line::FormCreate(TObject *Sender)<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'">Start=false;<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'">初始化标志变量</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'">//-----------------------------------------------------------------------<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'">void
__fastcall TForm_Line::Button1Click(TObject *Sender)<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'">Start=true;<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'">设置标志变量</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'">//-----------------------------------------------------------------------<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'">void
__fastcall TForm_Line::FormMouseDown(TObject *Sender, TMouseButton
Button,TShiftState Shift, int X, int Y)<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'">if
(Start)<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>Form_Line->Canvas->LineTo(X,Y);<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>//</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">绘制直线到鼠标的单击点</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'">//-----------------------------------------------------------------------<o:p></o:p></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'">程序说明：</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'">在程序的变量声明段中，首先定义了一个布尔型变量</SPAN><SPAN
lang=EN-US>Start</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，它的作用是控制程序绘制直线的开始时间，在窗体的初始化过程中通过语句</SPAN><SPAN
lang=EN-US>start:=false;</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设置为</SPAN><SPAN
lang=EN-US>False</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，如果在程序运行的过程中，用户单击按钮“绘制直线”，那么程序就自动的设置变量</SPAN><SPAN
lang=EN-US>Start</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的值为</SPAN><SPAN
lang=EN-US>True</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，然后通过语句</SPAN><SPAN
lang=EN-US>form1.Canvas.LineTo(x,y);</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在窗体上绘制直线。</SPAN></P>
<P class=MsoNormal><SPAN
lang=EN-US><o:p> </o:p></SPAN></P></DIV></DIV></CENTER>
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