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add Color.rainbow()

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This commit is contained in:
Hannes Janetzek 2014-01-17 20:43:16 +01:00
parent dd681e390d
commit d76d5ca754
1 changed files with 19 additions and 8 deletions
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11
vtm/src/org/oscim/backend/canvas/Color.java
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@ -123,13 +123,24 @@ public class Color {
public static float rToFloat(int color) { public static float rToFloat(int color) {
return ((color >>> 16) & 0xff) / 255f; return ((color >>> 16) & 0xff) / 255f;
} }
public static float gToFloat(int color) { public static float gToFloat(int color) {
return ((color >>> 8) & 0xff) / 255f; return ((color >>> 8) & 0xff) / 255f;
} }
public static float bToFloat(int color) { public static float bToFloat(int color) {
return ((color) & 0xff) / 255f; return ((color) & 0xff) / 255f;
} }
public static float aToFloat(int color) { public static float aToFloat(int color) {
return ((color >>> 24) & 0xff) / 255f; return ((color >>> 24) & 0xff) / 255f;
} }
public static int rainbow(float pos) {
float i = 255 * pos;
int r = (int) Math.round(Math.sin(0.024 * i + 0) * 127 + 128);
int g = (int) Math.round(Math.sin(0.024 * i + 2) * 127 + 128);
int b = (int) Math.round(Math.sin(0.024 * i + 4) * 127 + 128);
return 0xff000000 | (r << 16) | (g << 8) | b;
}
} }