private void ComputeQuickArgs(Matrix transform)
{
if (_quickTranArgs == null)
{
_quickTranArgs = new QuickTransformArgs();
}
ShapePoint geoPt1 = _features[0].Geometry.Centroid;
ShapePoint geoPt2 = _features[_features.Count - 1].Geometry.Centroid;
PointF prjPt1 = geoPt1.ToPointF();
PointF prjPt2 = geoPt2.ToPointF();
PointF[] screenPts = new PointF[] { prjPt1, prjPt2 };
transform.TransformPoints(screenPts);
//
_quickTranArgs.kLon = (screenPts[0].X - screenPts[1].X) / (prjPt1.X - prjPt2.X);
_quickTranArgs.kLat = (screenPts[0].Y - screenPts[1].Y) / (prjPt1.Y - prjPt2.Y);
_quickTranArgs.bLon = screenPts[0].X - _quickTranArgs.kLon * prjPt1.X;
_quickTranArgs.bLat = screenPts[0].Y - _quickTranArgs.kLat * prjPt1.Y;
}
public void Render(RenderArgs arg)
{
if (_location == null)
{
return;
}
PointF[] pts = new PointF[] { _location.ToPointF() };
(_runtime as IFeatureRenderEnvironment).CoordinateTransform.PrjCoord2PixelCoord(pts);
PointF pt = pts[0];
if (_isShowBubble)
{
DrawBubbleImage(arg, pt);
}
if (!_isFlash)
{
return;
}
int halfw = 6;
int w = 2 * halfw;
if (_needRender)
{
SmoothingMode oldM = arg.Graphics.SmoothingMode;
try
{
using (Pen p = new Pen(Color.Gray, 2))
{
arg.Graphics.SmoothingMode = SmoothingMode.HighQuality;
arg.Graphics.DrawLine(p, pt.X, 0, pt.X, _runtime.Host.CanvasSize.Height);
arg.Graphics.DrawLine(p, 0, pt.Y, _runtime.Host.CanvasSize.Width, pt.Y);
arg.Graphics.FillEllipse(Brushes.Green, (float)pt.X - halfw, (float)pt.Y - halfw, w, w);
}
}
finally
{
arg.Graphics.SmoothingMode = oldM;
}
}
}