diff options
| -rw-r--r-- | graphics/java/android/graphics/ColorMatrix.java | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/graphics/java/android/graphics/ColorMatrix.java b/graphics/java/android/graphics/ColorMatrix.java index 2478712..c22cda1 100644 --- a/graphics/java/android/graphics/ColorMatrix.java +++ b/graphics/java/android/graphics/ColorMatrix.java @@ -110,22 +110,31 @@ public class ColorMatrix { a[18] = aScale; } + /** + * Set the rotation on a color axis by the specified values. + * axis=0 correspond to a rotation around the RED color + * axis=1 correspond to a rotation around the GREEN color + * axis=2 correspond to a rotation around the BLUE color + */ public void setRotate(int axis, float degrees) { reset(); float radians = degrees * (float)Math.PI / 180; float cosine = FloatMath.cos(radians); float sine = FloatMath.sin(radians); switch (axis) { + // Rotation around the red color case 0: mArray[6] = mArray[12] = cosine; mArray[7] = sine; mArray[11] = -sine; break; + // Rotation around the green color case 1: - mArray[0] = mArray[17] = cosine; - mArray[2] = sine; - mArray[15] = -sine; + mArray[0] = mArray[12] = cosine; + mArray[2] = -sine; + mArray[10] = sine; break; + // Rotation around the blue color case 2: mArray[0] = mArray[6] = cosine; mArray[1] = sine; |