之前用到ColorMatrixColorFilter，其中除了傳入一個五階矩陣外慕的，還可以使用ColorMatrix，調(diào)用其成員函數(shù)
/**
* Set this colormatrix to scale by the specified values.
*/
public void setScale(float rScale, float gScale, float bScale,
float aScale) {
final float[] a = mArray;
for (int i = 19; i > 0; --i) {
a[i] = 0;
}
a[0] = rScale;
a[6] = gScale;
a[12] = bScale;
a[18] = aScale;
}
該方法為設(shè)置顏色縮放,可以實現(xiàn)顏色增強效果
@Override
protected void onDraw(Canvas canvas) {
//畫原圖
Paint paint = new Paint();
RectF rectF = new RectF(100, 100, 100 + bitmap.getWidth() / 2, 100 + bitmap.getHeight() / 2);
canvas.drawBitmap(bitmap, null, rectF, paint);
//畫設(shè)置ColorFilter效果后的圖
rectF = new RectF(600, 100, 600 + bitmap.getWidth() / 2, 100 + bitmap.getHeight() / 2);
ColorMatrix colorMatrix = new ColorMatrix();
//和顏色增強效果相同
colorMatrix.setScale(1.2f, 1.2f, 1.2f, 1);
paint.setColorFilter(new ColorMatrixColorFilter(colorMatrix));
canvas.drawBitmap(bitmap, null, rectF, paint);
}
縮放運算---乘法 -- 顏色增強.jpg
/**
* Set the matrix to affect the saturation of colors.
*
* @param sat A value of 0 maps the color to gray-scale. 1 is identity.
*/
public void setSaturation(float sat) {
reset();
float[] m = mArray;
final float invSat = 1 - sat;
final float R = 0.213f * invSat;
final float G = 0.715f * invSat;
final float B = 0.072f * invSat;
m[0] = R + sat; m[1] = G; m[2] = B;
m[5] = R; m[6] = G + sat; m[7] = B;
m[10] = R; m[11] = G; m[12] = B + sat;
}
設(shè)置飽和度
setSaturation.gif
/**
* Set the rotation on a color axis by the specified values.
* <p>
* <code>axis=0</code> correspond to a rotation around the RED color
* <code>axis=1</code> correspond to a rotation around the GREEN color
* <code>axis=2</code> correspond to a rotation around the BLUE color
* </p>
*/
public void setRotate(int axis, float degrees) {
reset();
double radians = degrees * Math.PI / 180d;
float cosine = (float) Math.cos(radians);
float sine = (float) Math.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[12] = cosine;
mArray[2] = -sine;
mArray[10] = sine;
break;
// Rotation around the blue color
case 2:
mArray[0] = mArray[6] = cosine;
mArray[1] = sine;
mArray[5] = -sine;
break;
default:
throw new RuntimeException();
}
}
參數(shù)aixs為 0 紅色軸，1，綠色哩治，2，藍色芭析； 參數(shù)degrees為旋轉(zhuǎn)的角度
setRotate.gif
/**
* Set this colormatrix to the concatenation of the two specified
* colormatrices, such that the resulting colormatrix has the same effect
* as applying matB and then applying matA.
* <p>
* It is legal for either matA or matB to be the same colormatrix as this.
* </p>
*/
public void setConcat(ColorMatrix matA, ColorMatrix matB) {
float[] tmp;
if (matA == this || matB == this) {
tmp = new float[20];
} else {
tmp = mArray;
}
final float[] a = matA.mArray;
final float[] b = matB.mArray;
int index = 0;
for (int j = 0; j < 20; j += 5) {
for (int i = 0; i < 4; i++) {
tmp[index++] = a[j + 0] * b[i + 0] + a[j + 1] * b[i + 5] +
a[j + 2] * b[i + 10] + a[j + 3] * b[i + 15];
}
tmp[index++] = a[j + 0] * b[4] + a[j + 1] * b[9] +
a[j + 2] * b[14] + a[j + 3] * b[19] +
a[j + 4];
}
if (tmp != mArray) {
System.arraycopy(tmp, 0, mArray, 0, 20);
}
}
