private void RebuildRegion()
{
// Wipe out the previous background image
if (_bitmap != null)
{
_bitmap.Dispose();
}
_bitmap = null;
#region Validate Width/Height
// See if the height and width are unstable
if (this.Width <= 0 || this.Height <= 0)
{
return;
}
#endregion
// Calculate the pie wedge
_regionPath = new GraphicsPath();
// Calculate the angle
double angle = Math.Asin(Convert.ToDouble(Width - Height) / Convert.ToDouble(Width));
angle = Utility3D.GetRadiansToDegrees(angle);
angle = 90d - angle;
// Calculate the base length
double baseLength = Math.Sqrt((Width * Width) - ((Width - Height) * (Width - Height)));
// Draw the path
_regionPath.AddArc(this.Width * -1, 0, this.Width * 2, this.Width * 2, 270, Convert.ToSingle(angle));
_regionPath.AddLine(Convert.ToSingle(baseLength), Height, 0, Height);
_regionPath.CloseFigure(); //outline.AddLine(0, Height, 0, 0);
// Draw my background image
_bitmap = new Bitmap(this.Width, this.Height);
//TODO: Make a gradient forground
using (Graphics graphics = Graphics.FromImage(_bitmap))
{
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.Clear(this.BackColor);
using (Pen pen = new Pen(SystemColors.ControlDark, 1f))
{
graphics.DrawPath(pen, _regionPath);
//graphics.DrawLine(pen, 0, this.Height - 1, this.Width, this.Height - 1); // the bottom line isn't drawing, so I'll back up a pixel
}
}
// Make me the shape of the pie wedge
this.Region = new Region(_regionPath);
this.Refresh();
}
public void FillPie(Brush brush, MyVector centerPoint, double radius, MyVector centerLine, double sweepRadians)
{
// Turn the centerline and sweep radians into angles that GDI likes
MyVector dummy = new MyVector(1, 0, 0);
double startDegrees;
dummy.GetAngleAroundAxis(out dummy, out startDegrees, centerLine);
startDegrees = Utility3D.GetRadiansToDegrees(startDegrees);
if (centerLine.Y < 0)
{
startDegrees *= -1;
}
double sweepDegrees = Utility3D.GetRadiansToDegrees(sweepRadians);
startDegrees -= sweepDegrees / 2d;
// Call my overload
FillPie(brush, centerPoint, radius, startDegrees, sweepDegrees);
}
