/// <summary>
/// 屏幕坐标系转地理坐标系
/// </summary>
/// <param name="screenPos"></param>
/// <returns></returns>
private MyPoint ScreenToWGS84(Point screenPoint)
{
screenPoint.Y = picBoxMap.Height - screenPoint.Y;
double centerScreenX = (double)picBoxMap.Width / 2; //屏幕坐标系中心点X坐标
double centerScreenY = (double)picBoxMap.Height / 2; //屏幕坐标系中心点Y坐标
double x = centerXY.X - (centerScreenX - screenPoint.X) * ratio * scaleChoice[scaleIndex]; //投影坐标系目标点X坐标
double y = centerXY.Y - (centerScreenY - screenPoint.Y) * ratio * scaleChoice[scaleIndex]; //投影坐标系目标点Y坐标
MyPoint xy = new MyPoint(x, y); //投影坐标系下的目标点
MyPoint lnglat = ETCProjection.XY2LngLat(xy); //WGS84坐标系下的目标点
return(lnglat);
}
/// <summary>
/// 移动选中的要素
/// </summary>
/// <param name="deltaX">X方向移动量，屏幕坐标系</param>
/// <param name="deltaY">y方向移动量，屏幕坐标系</param>
/// <param name="bounds"></param>
/// <param name="centerPos"></param>
/// <param name="scale"></param>
internal override void MoveSelectedFeature(int deltaX, int deltaY, Rectangle bounds, PointF centerPos, double scale)
{
for (int i = 0; i < polygons.Count; i++)
{
if (polygons[i].Selected == true)
{
for (int j = 0; j < polygons[i].PointCount; j++)
{
MyPoint pointXY = ETCProjection.LngLat2XY(polygons[i].Points[j]);
pointXY.X += scale * deltaX;
pointXY.Y -= scale * deltaY;
polygons[i].Points[j] = ETCProjection.XY2LngLat(pointXY);
}
}
}
SetMaxMin();
}
/// <summary>
/// 移动选中的要素
/// </summary>
/// <param name="deltaX">X方向移动量，屏幕坐标系</param>
/// <param name="deltaY">y方向移动量，屏幕坐标系</param>
/// <param name="bounds"></param>
/// <param name="centerPos"></param>
/// <param name="scale"></param>
internal override void MoveSelectedFeature(int deltaX, int deltaY, Rectangle bounds, PointF centerPos, double scale)
{
for (int i = 0; i < myPoints.Count; i++)
{
if (myPoints[i].Selected == true)
{
int id = myPoints[i].FID;
MyPoint pointXY = ETCProjection.LngLat2XY(myPoints[i]);
pointXY.X += scale * deltaX;
pointXY.Y -= scale * deltaY;
myPoints[i] = ETCProjection.XY2LngLat(pointXY);
myPoints[i].FID = id;
myPoints[i].Selected = true;
}
}
SetMaxMin();
}
/// <summary>
/// 地图鼠标移动事件
/// </summary>
private void picBoxMap_MouseMove(object sender, MouseEventArgs e)
{
isClick = false;
switch (operationType)
{
case MapOperation.SelectElement:
break;
case MapOperation.ZoomIn:
break;
case MapOperation.ZoomOut:
break;
case MapOperation.Pan: //漫游
if (e.Button == MouseButtons.Left)
{
int deltaX = e.X - mouseOldLoc.X;
int deltaY = e.Y - mouseOldLoc.Y;
centerXY = ETCProjection.LngLat2XY(centerLngLat);
centerXY.X -= deltaX * (float)ratio * (float)scaleChoice[scaleIndex];
centerXY.Y += deltaY * (float)ratio * (float)scaleChoice[scaleIndex]; //由于屏幕坐标系是左上坐标系，和地理坐标系相反，所以这里应该是+
centerLngLat = ETCProjection.XY2LngLat(centerXY);
mouseOldLoc = e.Location;
UpdateMapImg();
}
break;
case MapOperation.SelectFeatures: //选择要素
if (e.Button == MouseButtons.Left)
{
picBoxMap.Refresh();
int minX = Math.Min(startPoint.X, e.Location.X);
int maxX = Math.Max(startPoint.X, e.Location.X);
int minY = Math.Min(startPoint.Y, e.Location.Y);
int maxY = Math.Max(startPoint.Y, e.Location.Y);
DrawSelectBox(minX, minY, maxX - minX, maxY - minY); //画选择盒
}
break;
case MapOperation.Edit: //编辑要素
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
int deltaX = e.X - mouseOldLoc.X;
int deltaY = e.Y - mouseOldLoc.Y;
myMap.Layers[EditingIndex].MoveSelectedFeature(deltaX, deltaY, picBoxMap.Bounds, centerLngLat, ratio * scaleChoice[scaleIndex]);
mouseOldLoc = e.Location;
UpdateMapImg();
}
break;
case MapOperation.EditVertices: //编辑要素顶点
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
picBoxMap.Cursor = Cursors.SizeAll;
myMap.Layers[EditingIndex].MoveVertex(ScreenToWGS84(e.Location));
UpdateMapImg();
}
break;
case MapOperation.CreateFeatures: //创建要素
if (trackingPoints.Count > 0)
{
picBoxMap.Refresh();
DrawTrackingFeature();
DrawRubberBand(e.Location); //画橡皮筋
}
break;
}
//更新鼠标当前位置对应地理坐标
MyPoint mouseLngLat = ScreenToWGS84(e.Location);
StatusStripLblCoordinate.Text = mouseLngLat.X.ToString() + "," + mouseLngLat.Y.ToString();
StatusStripLblScale.Text = MapScale.ToString();
}