学步园

1.  Matrix.ScaleToFit

new Matrix.ScaleToFit[] {
            Matrix.ScaleToFit.FILL,
            Matrix.ScaleToFit.START,
            Matrix.ScaleToFit.CENTER,
            Matrix.ScaleToFit.END
        };

 private void drawFit(Canvas canvas, int index, Matrix.ScaleToFit stf) {
            canvas.save();
            
            setSrcR(index);
            mMatrix.setRectToRect(mSrcR, mDstR, stf);
            canvas.concat(mMatrix);
            drawSrcR(canvas, index);
            
            canvas.restore();
            
            canvas.drawRect(mDstR, mHairPaint);
        }