private void DrawChannel(Context g, ColorBgra color, int channel, long max, float mean)
{
Rectangle rect = Allocation.ToCairoRectangle ();
Histogram histogram = Histogram;
int l = (int)rect.X;
int t = (int)rect.Y;
int r = (int)(rect.X + rect.Width);
int b = (int)(rect.Y + rect.Height);
int entries = histogram.Entries;
long[] hist = histogram.HistogramValues [channel];
++max;
if (FlipHorizontal) {
Utility.Swap(ref l, ref r);
}
if (!FlipVertical) {
Utility.Swap(ref t, ref b);
}
PointD[] points = new PointD[entries + 2];
points[entries] = new PointD (Utility.Lerp (l, r, -1), Utility.Lerp (t, b, 20));
points[entries + 1] = new PointD (Utility.Lerp (l, r, -1), Utility.Lerp (b, t, 20));
for (int i = 0; i < entries; i += entries - 1) {
points[i] = new PointD (
Utility.Lerp (l, r, (float)hist[i] / (float)max),
Utility.Lerp (t, b, (float)i / (float)entries));
CheckPoint (rect, points [i]);
}
long sum3 = hist[0] + hist[1];
for (int i = 1; i < entries - 1; ++i) {
sum3 += hist[i + 1];
points[i] = new PointD(
Utility.Lerp(l, r, (float)(sum3) / (float)(max * 3.1f)),
Utility.Lerp(t, b, (float)i / (float)entries));
CheckPoint (rect, points [i]);
sum3 -= hist[i - 1];
}
byte intensity = selected[channel] ? (byte)96 : (byte)32;
ColorBgra pen_color = ColorBgra.Blend (ColorBgra.Black, color, intensity);
ColorBgra brush_color = color;
brush_color.A = intensity;
g.LineWidth = 1;
g.Rectangle (rect);
g.Clip ();
g.DrawPolygonal (points, pen_color.ToCairoColor ());
g.FillPolygonal (points, brush_color.ToCairoColor ());
}
protected Rectangle DrawShape(ShapeEngine engine, Layer l, bool drawCP, bool drawHoverSelection)
{
Document doc = PintaCore.Workspace.ActiveDocument;
Rectangle? dirty = null;
ShapeEngine activeEngine = ActiveShapeEngine;
if (activeEngine != null)
{
using (Context g = new Context(l.Surface))
{
g.AppendPath(doc.Selection.SelectionPath);
g.FillRule = FillRule.EvenOdd;
g.Clip();
g.Antialias = activeEngine.AntiAliasing ? Antialias.Subpixel : Antialias.None;
g.SetDash(DashPatternBox.GenerateDashArray(activeEngine.DashPattern, activeEngine.BrushWidth), 0.0);
g.LineWidth = activeEngine.BrushWidth;
//Draw the shape.
if (activeEngine.ControlPoints.Count > 0)
{
//Generate the points that make up the shape.
activeEngine.GeneratePoints(activeEngine.BrushWidth);
PointD[] points = activeEngine.GetActualPoints ();
//Expand the invalidation rectangle as necessary.
if (FillShape)
{
Color fill_color = StrokeShape ? activeEngine.FillColor : activeEngine.OutlineColor;
dirty = dirty.UnionRectangles (g.FillPolygonal (points, fill_color));
}
if (StrokeShape)
{
dirty = dirty.UnionRectangles(g.DrawPolygonal(points, activeEngine.OutlineColor));
}
}
g.SetDash(new double[] { }, 0.0);
//Draw anything extra (that not every shape has), like arrows.
DrawExtras(ref dirty, g, engine);
if (drawCP)
{
DrawControlPoints(g, drawHoverSelection);
}
}
}
return dirty ?? new Rectangle(0d, 0d, 0d, 0d);
}
