利用 Android 的 Matrix 类实现 J2ME 的 drawRegion 的镜像方法

核心提示：Matrix temp2 = new Matrix();float[] mirrorY = {-1, 0, 0,0, 1, 0,0, 0, 1};temp.setValues(mirrorY);switch(transform){case Sprite.TRANS_NONE:break;case Sprite.TRAN

Matrix temp2 = new Matrix();

float[] mirrorY = {

-1, 0, 0,

0, 1, 0,

0, 0, 1

};

temp.setValues(mirrorY);

switch(transform){

case Sprite.TRANS_NONE:

break;

case Sprite.TRANS_ROT90:

mMatrix.setRotate(90,width/2, height/2);

break;

case Sprite.TRANS_ROT180:

mMatrix.setRotate(180,width/2, height/2);

break;

case Sprite.TRANS_ROT270:

mMatrix.setRotate(270,width/2, height/2);

break;

case Sprite.TRANS_MIRROR:

mMatrix.postConcat(temp);

break;

case Sprite.TRANS_MIRROR_ROT90:

mMatrix.postConcat(temp);

mMatrix.setRotate(90,width/2, height/2);

break;

case Sprite.TRANS_MIRROR_ROT180:

mMatrix.postConcat(temp);

mMatrix.setRotate(180,width/2, height/2);

break;

case Sprite.TRANS_MIRROR_ROT270:

mMatrix.postConcat(temp);

mMatrix.setRotate(270,width/2, height/2);

break;

}

mMatrix.setTranslate(x_dest, y_dest);

canvas.drawBitmap(newMap, mMatrix, mPaint);

}

public void drawRegion(Image image_src,

int x_src, int y_src,

int width, int height,

int transform,

int x_dest, int y_dest,

int anchor){

if((anchor&VCENTER) != 0){

y_dest -= height/2;

}else if((anchor&BOTTOM) != 0){

y_dest -= height;

}

if((anchor&RIGHT) != 0){

x_dest -= width;

}else if((anchor&HCENTER) != 0){

x_dest -= width/2;

}

Bitmap newMap = Bitmap.createBitmap(image_src.getBitmap(), x_src, y_src, width, height);

Matrix mMatrix = new Matrix();

Matrix temp = new Matrix();