matrix is ​​not also specify two different?

            
I think both the picture zoom, and pan, but specify two parameters, the parameters are specified after the effective, pre-specified parameter is invalid, is not only an effective matrix?

 

Matrix matrix = new Matrix (); 
matrix.setTranslate (toLeft, toTop); 
matrix.setScale (rateOfWidth * imgScale, rateOfWidth * imgScale); 
canvas.drawBitmap (bmpOri, matrix, paint); 

After that, the effective!
Reply:
Own answers and share

 

Matrix matrix = new Matrix (); 
matrix.preScale (imgRateOfWidth * imgScale, imgRateOfWidth * imgScale); 
matrix.postTranslate (-toLeft,-toTop); 
canvas.drawBitmap (bmpOri, matrix, paint); 

Into this just fine!
Reply:
This is a problem of dirty region