使用.net开发基于MapX的地理信息系统-鹰眼图模块

VB下开发MapX比较容易，鉴于现在.net开发环境 日益流行，使用.net开发基于MapX的地理信息系统的朋友越来越多，现在我共享我平时开发的一些代码，希望能给大家带来一些帮助：

鹰眼图实际上是在导航图上，显示一个主窗体显示的区域！在导航图上添加一个临时层，在上面添加一个矩形的图元！

private void InitEagleReigon()
{
MapXLib.Feature TempFea;
MapXLib.StyleClass tempStyle;

try
{
if (this.m_eagleLayer.AllFeatures.Count == 0)//判断该图元是否存在
{
tempStyle = new MapXLib.StyleClass();
//设置矩形边框样式
tempStyle.RegionPattern = MapXLib.FillPatternConstants.miPatternNoFill;
tempStyle.RegionBorderColor = 255;
tempStyle.RegionBorderWidth = 2;
//在临时图层添加大小为mymap的边界的Rectangle对象
MapXLib.Points pnts = new MapXLib.Points();
pnts.AddXY(axMap_Full.CtlBounds.XMin, axMap_Full.CtlBounds.YMin, 1);
pnts.AddXY(axMap_Full.CtlBounds.XMax, axMap_Full.CtlBounds.YMin, 2);
pnts.AddXY(axMap_Full.CtlBounds.XMax, axMap_Full.CtlBounds.YMax, 3);
pnts.AddXY(axMap_Full.CtlBounds.XMin, axMap_Full.CtlBounds.YMax, 4);
TempFea = this.axMap_Eagle.FeatureFactory.CreateRegion(pnts, tempStyle);
m_fea = m_eagleLayer.AddFeature(TempFea, nullObject);
m_fea.Update(true, nullObject);
}
else
{
m_fea.Parts._Item(1).RemoveAll();
m_fea.Parts._Item(1).AddXY(axMap_Full.CtlBounds.XMin, axMap_Full.CtlBounds.YMin, 1);
m_fea.Parts._Item(1).AddXY(axMap_Full.CtlBounds.XMax, axMap_Full.CtlBounds.YMin, 2);
m_fea.Parts._Item(1).AddXY(axMap_Full.CtlBounds.XMax, axMap_Full.CtlBounds.YMax, 3);
m_fea.Parts._Item(1).AddXY(axMap_Full.CtlBounds.XMin, axMap_Full.CtlBounds.YMax, 4);
m_fea.Update(true, nullObject);
}
}
catch (Exception ex)
{
MessageBox.Show("InitEagleReigon:" + ex.Message);
}
}

#region 鹰眼功能模块
private void axMap_Eagle_MouseDownEvent(object sender, AxMapXLib.CMapXEvents_MouseDownEvent e)
{
double MapX=0.0;
double MapY=0.0;
IsMouseDown = true;
axMap_Eagle.ConvertCoord(ref e.x, ref e.y, ref MapX, ref MapY, MapXLib.ConversionConstants.miScreenToMap);
this.axMap_Full.CenterX = MapX;
this.axMap_Full.CenterY = MapY;

}
private void axMap_Eagle_MouseMoveEvent(object sender, AxMapXLib.CMapXEvents_MouseMoveEvent e)
{
if (IsMouseDown)
{
double MapX = 0.0;
double MapY = 0.0;
axMap_Eagle.ConvertCoord(ref e.x, ref e.y, ref MapX, ref MapY, MapXLib.ConversionConstants.miScreenToMap);
this.axMap_Full.CenterX = MapX;
this.axMap_Full.CenterY = MapY;
}
}
private void axMap_Eagle_MouseUpEvent(object sender, AxMapXLib.CMapXEvents_MouseUpEvent e)
{
IsMouseDown = false;
}
private void axMap_Full_MapViewChanged(object sender, EventArgs e)
{
if (IsEndInit)
InitEagleReigon();//初始化eagle或者根据FullMap的可视改变改变eagle的大小
}
#endregion

因为在VB里面可以使用默认参数，在.net里面没有默认参数，需要通过System.Reflection.Missing.Value来代替！

以后我会陆续发表其他的功能模块！敬请关注