/// <summary>
/// 指示一个多边形是否完全位于多边形类
/// </summary>
/// <param name="poly"></param>
/// <param name="box"></param>
/// <returns></returns>
internal static bool IsPolygonWithinBox(Polygon poly, RectangeD box)
{
int poiCount = poly.PointCount;
for (int i = 0; i < poiCount; i++)
{
//if (! IsPointWiBox(poly.GetPoint(i), box) ) {
if (IsPointWiBox(poly.GetPoint(i), box) == false)
{
return(false);
}
}
return(true);
}
/// <summary>
/// 返回选中的多边形集合
/// </summary>
/// <param name="box"></param>
/// <returns></returns>
public Polygon[] SelectByBox(RectangeD box)
{
List <Polygon> sSels = new List <Polygon>();
int polyCount = _Polygons.Count;
for (int i = 0; i < polyCount; i++)
{
if (MapTools.IsPolygonWithinBox(_Polygons[i], box) == true)
{
sSels.Add(_Polygons[i]);
}
}
return(sSels.ToArray());//返回选中的多边形集合
}
internal static class MapTools {//静态类,不能够实例化,类型下的所有函数都要声明static
//internal 本程序集可以访问，介于public和private之间
/// <summary>
/// 判断指定点是否在指定矩形内
/// </summary>
/// <param name="poi"></param>
/// <param name="rect"></param>
/// <returns></returns>
internal static bool IsPointWiBox(PointD poi, RectangeD box)
{
if (poi.X < box.MinX || poi.X > box.MaxX)
{
return(false);
}
else if (poi.Y < box.MinY || poi.Y > box.MaxY)
{
return(false);
}
else //在边界上也是位于矩形内
{
return(true);
}
}
private void MapControl_MouseUp(object sender, MouseEventArgs e)
{
switch (mMapOpstyle)
{
case 0:
break;
case 1: //放大
break;
case 2: //缩小
break;
case 3: //漫游
break;
case 4: //输入多边形
break;
case 5: //选择
if (e.Button == MouseButtons.Left)
{
double sMinX = Math.Min(mStartPoint.X, e.Location.X);
double sMaxX = Math.Max(mStartPoint.X, e.Location.X);
double sMinY = Math.Min(mStartPoint.Y, e.Location.Y);
double sMaxY = Math.Max(mStartPoint.Y, e.Location.Y);
PointD sTopLeft = new PointD(sMinX, sMinY);
PointD sButtonRight = new PointD(sMaxX, sMaxY);
//变成地图坐标
PointD sTopLeftm = ToMapPoint(sTopLeft);
PointD sButtonRightm = ToMapPoint(sButtonRight);
RectangeD sSelBox = new RectangeD(sTopLeftm.X, sButtonRightm.X, sTopLeftm.Y, sButtonRightm.Y);
Refresh();
SelectingFinished?.Invoke(this, sSelBox);
}
break;
}
}
