internal Image ChangeHueAndSaturation(Hsv targetHsv)
{
var bitmap = new Bitmap(Image);
var bitmapData = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadWrite, bitmap.PixelFormat);
byte bitsPerPixel = 32;
var size = bitmapData.Stride * bitmapData.Height;
byte[] data = new byte[size];
System.Runtime.InteropServices.Marshal.Copy(bitmapData.Scan0, data, 0, size);
for (int i = 0; i < size; i += bitsPerPixel / 8)
{
var b = data[i];
var g = data[i + 1];
var r = data[i + 2];
var hsv = new Rgb(r, g, b).ToHsv();
var newHsv = new Hsv(targetHsv.H, targetHsv.S, hsv.V);
var newRgb = newHsv.ToRgb();
data[i] = newRgb.B;
data[i + 1] = newRgb.G;
data[i + 2] = newRgb.R;
}
System.Runtime.InteropServices.Marshal.Copy(data, 0, bitmapData.Scan0, data.Length);
bitmap.UnlockBits(bitmapData);
return(bitmap);
}
protected static List <Color> MakeRainbow(int length, int alpha, float val = 1)
{
List <Color> colors = new List <Color>();
for (int i = 0; i < length; i++)
{
Hsv color = new Hsv {
H = (double)i / length * 360, S = 1, V = val
};
IRgb rgb = color.ToRgb();
colors.Add(Color.FromArgb(alpha, (int)rgb.R, (int)rgb.G, (int)rgb.B));
}
return(colors);
}
public void ShouldConvertFromRgbToHsv()
{
for (var h = 0; h < 360; h++)
{
for (var s = 0f; s <= 1; s += 0.1f)
{
for (var v = 0f; v <= 1; v += 0.1f)
{
var hsv = new Hsv(h, s, v);
var rgb = hsv.ToRgb();
var hsv2 = rgb.ToHsv();
Assert.AreEqual(hsv.H, hsv2.H);
}
}
}
}
private void DrawOutline(Graphics g, float[] heights, float scale)
{
List <PointF> outerEdge = GetCircularPoints(heights, scale, g);
PathGradientBrush b = new PathGradientBrush(outerEdge.ToArray());
Hsv color = new Hsv {
H = (double)maxAngle * 180 / Math.PI, S = 1, V = 1
};
IRgb rgb = color.ToRgb();
b.CenterColor = Color.FromArgb(255, (int)rgb.R, (int)rgb.G, (int)rgb.B);
b.SurroundColors = new Color[] { Color.FromArgb(0, 0, 0, 0) };
Region rgn = new Region();
g.FillPolygon(b, outerEdge.ToArray());
}