| public static HsvToRgb ( double hue, double saturation, double value ) : Color | ||
| hue | double | Hue in [0, 360) |
| saturation | double | Saturation in [0, 1) |
| value | double | Value in [0, 1) |
| return | Color | |
/// <summary>
///
/// </summary>
/// <param name="x"></param>
/// <param name="y">Expected to grow downward.</param>
/// <returns></returns>
public Color GetColor(int x, int y)
{
double xPrime = x - PixelRadius;
double yPrime = PixelRadius - y;
double radius = Math.Sqrt(Math.Pow(yPrime, 2) + Math.Pow(xPrime, 2));
if (radius > PixelRadius)
{
return(Color.Transparent);
}
double saturation = radius / PixelRadius;
double hue = Math.Atan2(yPrime, xPrime) * 180.0 / Math.PI;
if (hue < 0)
{
hue += 360;
}
return(Utility.HsvToRgb(hue, saturation, 1.0));
}
//public void Draw(Graphics g, int x, int y)
//{
// g.DrawImage(canvas, x, y);
//}
void GenerateSwatches()
{
palette = new List <List <Color> >(NumRows);
for (int row = 0; row < NumRows; ++row)
{
palette.Add(new List <Color>(NumColumns));
}
// set primary 4 greys
if (NumRows > 0 && NumColumns > 0)
{
palette[0].Add(Color.Black);
}
if (NumRows > 0 && NumColumns > 1)
{
palette[0].Add(Color.Gray);
}
if (NumRows > 1 && NumColumns > 0)
{
palette[1].Add(Color.White);
}
if (NumRows > 1 && NumColumns > 1)
{
palette[1].Add(Color.LightGray);
}
// all remaining colors are from all hues
int remainingColumns = NumColumns - 2;
for (int col = 0; col < remainingColumns; ++col)
{
double percent = ((double)col) / remainingColumns;
double hue = 360.0 * percent;
palette[0].Add(Utility.HsvToRgb(hue, 1.0, 1.0));
palette[1].Add(Utility.HsvToRgb(hue, 1.0, 0.5));
}
}