diff options
| -rw-r--r-- | src/main/java/io/github/cottonmc/cotton/gui/widget/data/Color.java | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/main/java/io/github/cottonmc/cotton/gui/widget/data/Color.java b/src/main/java/io/github/cottonmc/cotton/gui/widget/data/Color.java index bc985b4..3dbbe39 100644 --- a/src/main/java/io/github/cottonmc/cotton/gui/widget/data/Color.java +++ b/src/main/java/io/github/cottonmc/cotton/gui/widget/data/Color.java @@ -185,6 +185,41 @@ public interface Color { this.luma = luma; } + public HSL(int rgb) { + float r = i_f(rgb >> 16); + float g = i_f(rgb >> 8); + float b = i_f(rgb); + + float max = Math.max(r, Math.max(g, b)); + float min = Math.min(r, Math.min(g, b)); + + hue = 0; + if (max==min) { + hue = 0; + } else if (max==r) { + hue = (g-b)/(max-min); + hue *= 60f/360f; + } else if (max==g) { + hue = 2 + (b-r)/(max-min); + hue *= 60f/360f; + } else { //max==b + hue = 4 + (r-g)/(max-min); + hue *= 60f/360f; + } + if (hue<0) hue+=1; + + luma = (max+min)/2f; + + sat = 0; + if (max==0) { + // the saturation of black is zero, special-cased because (0-0)/0 is undefined + } else if (min==1) { + // the saturation of white is zero: (1-1)/1, special-cased for kicks I guess + } else { + sat = (max-luma) / Math.min(luma, 1-luma); + } + } + public int toRgb() { float chroma = (1 - (Math.abs(2*luma - 1))) * sat; @@ -254,6 +289,10 @@ public interface Color { int result = (int)(f*255); return Math.min(255,Math.max(0, result)); } + + private static float i_f(int i) { + return (i & 0xFF) / 255f; + } } public static class LCH implements Color { |