/// <summary>
/// Create heightfield by extracting colour from image
/// </summary>
/// <param name="texture"></param>
/// <param name="component"></param>
/// <param name="invertX"></param>
/// <param name="invertY"></param>
public HeightField(Texture2D texture, ColourComponent component = ColourComponent.Luminosity, bool invertX = false, bool invertY = false)
{
this.width = texture.width;
this.height = texture.height;
this.heightmap = new float[this.width * this.height];
for (int w = 0; w < texture.width; w++)
{
for (int h = 0; h < texture.height; h++)
{
this[w, h] = SampleColour(component, texture.GetPixel(
invertX ? ((texture.width - 1) - w) : w,
invertY ? ((texture.height - 1) - h) : h
));
}
}
}
/// <summary>
/// Sampel a height from a colour
/// </summary>
/// <param name="colour"></param>
/// <returns></returns>
private static float SampleColour(ColourComponent heightColour, Color colour)
{
switch (heightColour)
{
case ColourComponent.Alpha:
return(colour.a);
case ColourComponent.Blue:
return(colour.b);
case ColourComponent.Green:
return(colour.g);
case ColourComponent.Luminosity:
return(0.21f * colour.r + 0.72f * colour.g + 0.07f * colour.b);
default:
return(colour.r);
}
}
private Bitmap GetColourPlaneBitmap(Rectangle rect, ColourComponent comp)
{
Bitmap map = new Bitmap(rect.Width, rect.Height, PixelFormat.Format24bppRgb);
BitmapData mapData = map.LockBits(
new Rectangle(0, 0, map.Width, map.Height),
ImageLockMode.WriteOnly,
PixelFormat.Format24bppRgb);
unsafe
{
byte *pt0 = (byte *)mapData.Scan0;
Parallel.For(rect.Top, rect.Bottom, y =>
{
int bitmapY = y - rect.Top;
for (int x = rect.Left; x < rect.Right; x++)
{
int bitmapX = x - rect.Left;
Color colour;
switch (comp)
{
case ColourComponent.HUE:
colour = AdobeColours.HSB_to_RGB(new AdobeColours.HSB(
_hsb.H,
x / 255.0,
1 - y / 255.0));
break;
case ColourComponent.SATURATION:
colour = AdobeColours.HSB_to_RGB(new AdobeColours.HSB(
x / 255.0,
_hsb.S,
1 - y / 255.0));
break;
case ColourComponent.BRIGHTESS:
colour = AdobeColours.HSB_to_RGB(new AdobeColours.HSB(
x / 255.0,
1 - y / 255.0,
_hsb.B));
break;
case ColourComponent.RED:
colour = Color.FromArgb(
_rgb.R,
x,
255 - y);
break;
case ColourComponent.GREEN:
colour = Color.FromArgb(
x,
_rgb.G,
255 - y);
break;
case ColourComponent.BLUE:
colour = Color.FromArgb(
x,
255 - y,
_rgb.B);
break;
default:
throw new ArgumentException();
}
if (_webSafeColoursOnly)
{
colour = AdobeColours.GetNearestWebSafeColour(colour);
}
byte *pt = pt0 + mapData.Stride * bitmapY + 3 * bitmapX;
pt[2] = colour.R;
pt[1] = colour.G;
pt[0] = colour.B;
}
});
}
map.UnlockBits(mapData);
return(map);
}
private Bitmap GetColourStripBitmap(Rectangle rect, ColourComponent comp)
{
Bitmap map = new Bitmap(rect.Width, rect.Height, PixelFormat.Format24bppRgb);
BitmapData mapData = map.LockBits(
new Rectangle(0, 0, map.Width, map.Height),
ImageLockMode.WriteOnly,
PixelFormat.Format24bppRgb);
int height = this.Height - 8;
unsafe
{
byte *pt0 = (byte *)mapData.Scan0;
Parallel.For(rect.Top, rect.Bottom, y =>
{
int bitmapY = y - rect.Top;
Color colour;
switch (comp)
{
case ColourComponent.HUE:
colour = AdobeColours.HSB_to_RGB(new AdobeColours.HSB(
1.0 - (double)y / height,
1,
1));
break;
case ColourComponent.SATURATION:
colour = AdobeColours.HSB_to_RGB(new AdobeColours.HSB(
_hsb.H,
1.0 - (double)y / height,
_hsb.B));
break;
case ColourComponent.BRIGHTESS:
colour = AdobeColours.HSB_to_RGB(new AdobeColours.HSB(
_hsb.H,
_hsb.S,
1.0 - (double)y / height));
break;
case ColourComponent.RED:
int red = 255 - (int)Math.Round(255 * (double)y / height);
colour = Color.FromArgb(
red,
_rgb.G,
_rgb.B);
break;
case ColourComponent.GREEN:
int green = 255 - (int)Math.Round(255 * (double)y / height);
colour = Color.FromArgb(
_rgb.R,
green,
_rgb.B);
break;
case ColourComponent.BLUE:
int blue = 255 - (int)Math.Round(255 * (double)y / height);
colour = Color.FromArgb(
_rgb.R,
_rgb.G,
blue);
break;
default:
throw new ArgumentException();
}
if (_webSafeColoursOnly)
{
colour = AdobeColours.GetNearestWebSafeColour(colour);
}
for (int x = rect.Left; x < rect.Right; x++)
{
int bitmapX = x - rect.Left;
byte *pt = pt0 + mapData.Stride * bitmapY + 3 * bitmapX;
pt[2] = colour.R;
pt[1] = colour.G;
pt[0] = colour.B;
}
});
}
map.UnlockBits(mapData);
return(map);
}
