protected unsafe override void RenderLine (ISurface src, ISurface dst, Rectangle rect)
{
PointD start = new PointD (0, 0);
double theta = ((double)(angle + 180) * 2 * Math.PI) / 360.0;
double alpha = (double)distance;
PointD end = new PointD ((float)alpha * Math.Cos (theta), (float)(-alpha * Math.Sin (theta)));
if (centered) {
start.X = -end.X / 2.0f;
start.Y = -end.Y / 2.0f;
end.X /= 2.0f;
end.Y /= 2.0f;
}
PointD[] points = new PointD[((1 + distance) * 3) / 2];
if (points.Length == 1) {
points[0] = new PointD (0, 0);
} else {
for (int i = 0; i < points.Length; ++i) {
float frac = (float)i / (float)(points.Length - 1);
points[i] = Utility.Lerp (start, end, frac);
}
}
ColorBgra* samples = stackalloc ColorBgra[points.Length];
int src_width = src.Width;
int src_height = src.Height;
for (int y = rect.Top; y <= rect.Bottom; ++y) {
ColorBgra* dstPtr = dst.GetPointAddress (rect.Left, y);
for (int x = rect.Left; x <= rect.Right; ++x) {
int sampleCount = 0;
for (int j = 0; j < points.Length; ++j) {
PointD pt = new PointD (points[j].X + (float)x, points[j].Y + (float)y);
if (pt.X >= 0 && pt.Y >= 0 && pt.X <= (src_width - 1) && pt.Y <= (src_height - 1)) {
samples[sampleCount] = Utility.GetBilinearSampleClamped (src, (float)pt.X, (float)pt.Y);
++sampleCount;
}
}
*dstPtr = ColorBgra.Blend (samples, sampleCount);
++dstPtr;
}
}
}
#endregion
