/// <summary>
/// Draws the content of the control filling in all color values with the provided Luminance or Brightness value.
/// </summary>
private void Draw_Style_Luminance(Gdk.Window win)
{
//hack: use CAIRO instead of Systme.Drawing bug
Cairo.Context context = Gdk.CairoHelper.Create(win);
GraphUtil.HSL hsl_start = new GraphUtil.HSL();
GraphUtil.HSL hsl_end = new GraphUtil.HSL();
hsl_start.L = m_hsl.L;
hsl_end.L = m_hsl.L;
hsl_start.S = 1.0;
hsl_end.S = 0.0;
for (int i = 0; i < this.Allocation.Width - 4; i++) // For each vertical line in the control:
{
hsl_start.H = (double)i / (this.Allocation.Width - 4); // Calculate Hue at this line (Saturation and Luminance are constant)
hsl_end.H = hsl_start.H;
Cairo.LinearGradient gradient = new Cairo.LinearGradient(2, 2, 1, this.Allocation.Height - 4);
gradient.AddColorStop(0, CairoUtil.ColorFromRgb(GraphUtil.HSL_to_RGB(hsl_start)));
gradient.AddColorStop(1, CairoUtil.ColorFromRgb(GraphUtil.HSL_to_RGB(hsl_end)));
context.Rectangle(i + 2, 2, 1, this.Allocation.Height - 4);
context.Pattern = gradient;
context.Fill();
}
context.Stroke();
((IDisposable)context).Dispose();
}
private void DrawCenterFilledCircle(Cairo.PointD center, double radius, Cairo.Context e)
{
e.Arc(center.X, center.Y, radius, 0, 360);
Cairo.Gradient pat = new Cairo.LinearGradient(100, 200, 200, 100);
pat.AddColorStop(0, CairoUtil.ColorFromRgb(240, 235, 229, 0.3));
pat.AddColorStop(1, CairoUtil.ColorFromRgb(0, 0, 0, 0.2));
e.LineWidth = 0.1;
e.Pattern = pat;
e.FillPreserve();
e.Stroke();
}