📄 c# mapx之一--黑暗之痕.htm
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color=#444444 size=3>下面</FONT><SPAN lang=EN-US><FONT
color=#444444 size=3>,通过一个在地图上测距的例子,来介绍一下如何在C#下自定义MapX工具
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</SPAN>如前所述建立一个C#的Windows应用程序并将Mapinfo MapX V5
控件加到窗体上.并加入一个Button控件button1.将button1的Text属性改为"测距",再在窗口中放上两个Label控件label1,label2,将它们的Text属性设置为""空字符串,如下图:
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o:title="测距程序界面"></IMAGEDATA></SHAPE>
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</SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体">双击设计窗体<SPAN
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color=#444444 size=3>Form1_Load代码如下: </FONT>
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color=#444444>private</FONT></SPAN><SPAN
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color=#444444> <SPAN
style="COLOR: blue">void</SPAN> Form1_Load(<SPAN
style="COLOR: blue">object</SPAN> sender,
System.EventArgs e) </FONT>
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color=#444444>{ </FONT>
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color=#444444>axMap1.CreateCustomTool(100,MapXLib.ToolTypeConstants.miToolTypePoly,
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color=#444444>MapXLib.CursorConstants.miCrossCursor,<SPAN
style="COLOR: blue">null</SPAN>,<SPAN
style="COLOR: blue">null</SPAN>,<SPAN
style="COLOR: blue">null</SPAN>);</FONT></SPAN></I></B><SPAN
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color=#444444> </FONT>
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color=#444444>} </FONT>
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</SPAN>在加载窗口的时候,我们定义了一个工具.它的编号是100(不要和MapX本身的工具编号重复),它的类型是一个多义线,采用十字光标.
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</SPAN>关于此函数的用法,建议查看MapX的开发手册和相关资料. </FONT></FONT>
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</SPAN>现在我们定义了一个编号为100的工具,可以在程序中使用它了.双击设计窗体中的button1,编写它的Click事件处理代码如下:
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color=#444444>private</FONT></SPAN><SPAN
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color=#444444> <SPAN
style="COLOR: blue">void</SPAN>
button1_Click(<SPAN
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System.EventArgs e) </FONT>
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color=#444444>{ </FONT>
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</FONT></SPAN><B><I><FONT
color=#444444>axMap1.CurrentTool=(MapXLib.ToolConstants)100;
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color=#444444>} </FONT>
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</SPAN>现在编译运行,单击button1,就可以在地图上使用这个工具了.但是还有一部分重要的代码没有完成:测距!
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</SPAN>完成测距功能的代码在C#使用MapX开发GIS中非常具有代表性,也比较有难度.我在首次使用C#+MapX开发GIS的时候,被这⌨️ 快捷键说明
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