private void DrawSpline(Context g)
{
var infos = GetDrawingInfos ();
foreach (var controlPoints in ControlPoints) {
int points = controlPoints.Count;
SplineInterpolator interpolator = new SplineInterpolator ();
IList<int> xa = controlPoints.Keys;
IList<int> ya = controlPoints.Values;
PointD[] line = new PointD [size];
for (int i = 0; i < points; i++) {
interpolator.Add (xa [i], ya [i]);
}
for (int i = 0; i < line.Length; i++) {
line[i].X = (float)i;
line[i].Y = (float)(Utility.Clamp(size - 1 - interpolator.Interpolate (i), 0, size - 1));
}
g.LineWidth = 2;
g.LineJoin = LineJoin.Round;
g.MoveTo (line [0]);
for (int i = 1; i < line.Length; i++)
g.LineTo (line [i]);
infos.MoveNext ();
var info = infos.Current;
g.Color = info.Color;
g.LineWidth = info.IsActive ? 2 : 1;
g.Stroke ();
}
}
private UnaryPixelOp MakeUop()
{
UnaryPixelOp op;
byte[][] transferCurves;
int entries;
switch (mode) {
case ColorTransferMode.Rgb:
UnaryPixelOps.ChannelCurve cc = new UnaryPixelOps.ChannelCurve();
transferCurves = new byte[][] { cc.CurveR, cc.CurveG, cc.CurveB };
entries = 256;
op = cc;
break;
case ColorTransferMode.Luminosity:
UnaryPixelOps.LuminosityCurve lc = new UnaryPixelOps.LuminosityCurve();
transferCurves = new byte[][] { lc.Curve };
entries = 256;
op = lc;
break;
default:
throw new InvalidEnumArgumentException();
}
int channels = transferCurves.Length;
for (int channel = 0; channel < channels; channel++) {
SortedList<int, int> channelControlPoints = control_points[channel];
IList<int> xa = channelControlPoints.Keys;
IList<int> ya = channelControlPoints.Values;
SplineInterpolator interpolator = new SplineInterpolator();
int length = channelControlPoints.Count;
for (int i = 0; i < length; i++) {
interpolator.Add(xa[i], ya[i]);
}
for (int i = 0; i < entries; i++) {
transferCurves[channel][i] = Utility.ClampToByte(interpolator.Interpolate(i));
}
}
return op;
}