private void DrawRotationGrabberline(IDisplay display)
{
if (display == null || display.GraphicsContext == null)
{
return;
}
Envelope env = new Envelope(0, 0, 1, 1);
Polyline pLine = new Polyline();
Path path = new Path();
pLine.AddPath(path);
double tol = 25.0 * display.mapScale / (96 / 0.0254); // [m]
if (display.SpatialReference != null &&
display.SpatialReference.SpatialParameters.IsGeographic)
{
tol = 180.0 * tol / Math.PI / 6370000.0;
}
if (_scaleY > 0)
{
path.AddPoint(new Point(env.UpperLeft.X + env.Width / 2, env.UpperLeft.Y));
path.AddPoint(new Point(env.UpperLeft.X + env.Width / 2, env.UpperLeft.Y + tol / _scaleY));
}
else
{
path.AddPoint(new Point(env.LowerLeft.X + env.Width / 2, env.LowerLeft.Y));
path.AddPoint(new Point(env.LowerLeft.X + env.Width / 2, env.LowerLeft.Y + tol / _scaleY));
}
SimpleLineSymbol lSym = new SimpleLineSymbol();
ScaleGeometry(pLine, _scaleX, _scaleY);
RotateGeometry(pLine, Math.Cos(_angle), Math.Sin(_angle));
TranslateGeometry(pLine, _xOffset, _yOffset);
display.Draw(lSym, pLine);
lSym.Release();
}
virtual public void DrawGrabbers(IDisplay display)
{
IMultiPoint grabbers = Grabbers(display, true);
if (grabbers == null)
{
return;
}
System.Drawing.Drawing2D.SmoothingMode smode = display.GraphicsContext.SmoothingMode;
display.GraphicsContext.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
SimplePointSymbol pointSymbol = new SimplePointSymbol();
pointSymbol.Color = System.Drawing.Color.White;
pointSymbol.OutlineColor = System.Drawing.Color.Black;
pointSymbol.OutlineWidth = 1;
pointSymbol.Size = 8;
if (display.GraphicsContainer.EditMode == GrabberMode.Pointer)
{
Ring ring = new Ring();
for (int i = 0; i < Math.Min(grabbers.PointCount, 4); i++)
{
ring.AddPoint(grabbers[i]);
}
Polygon polygon = new Polygon();
polygon.AddRing(ring);
SimpleLineSymbol lSymbol = new SimpleLineSymbol();
lSymbol.Color = System.Drawing.Color.Gray;
lSymbol.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;
display.Draw(lSymbol, polygon);
lSymbol.Release();
for (int i = 0; i < grabbers.PointCount; i++)
{
if (!UseGrabber((GrabberIDs)i))
{
continue;
}
if (i > 7 && pointSymbol.Color == System.Drawing.Color.White)
{
pointSymbol.Color = System.Drawing.Color.Yellow;
DrawRotationGrabberline(display);
}
display.Draw(pointSymbol, grabbers[i]);
}
}
else if (display.GraphicsContainer.EditMode == GrabberMode.Vertex)
{
pointSymbol.Marker = SimplePointSymbol.MarkerType.Square;
pointSymbol.Size = 5;
for (int i = 0; i < grabbers.PointCount; i++)
{
display.Draw(pointSymbol, grabbers[i]);
}
}
display.GraphicsContext.SmoothingMode = smode;
}