/// <summary>
/// Creates a bitmap from the HGT file, where each height corresponds to a color set by the setter.
/// </summary>
/// <param name="setter">Maps the (lowest, highest) interval with short.MinValue for missing height value into RGB colorspace.</param>
/// <returns>Bitmap created using the setter.</returns>
public System.Drawing.Bitmap ToBitmap(ColorSetter setter)
{
int size = (int)Math.Sqrt(data.Length);
var bmp = new System.Drawing.Bitmap(size, size);
using (var k = new LockBitmap.LockBitmap(bmp))
{
for (int i = 0; i < data.Length; i++)
{
k.SetPixel(i % size, i / size, setter(Lowest, Highest, data[i]));
}
}
return(bmp);
}
public static void bitmapToGrayscale(Bitmap bm)
{
double coefR = 0.21,
coefG = 0.71,
coefB = 0.07;
using (var lb = new LockBitmap.LockBitmap(bm))
{
for (var y = 0; y < lb.Height; y++)
{
for (var x = 0; x < lb.Width; x++)
{
var color = lb.GetPixel(x, y);
var intensity = (int)(coefR * color.R + coefG * color.G + coefB * color.B);
var newColor = Color.FromArgb(intensity, intensity, intensity);
lb.SetPixel(x, y, newColor);
}
}
}
}