Canvas using Drawbitmap to draw pictures in Android

1, the main method of drawing pictures

Bitmap: Picture object, left: offset to position, top: offset at top
Drawbitmap (Bitmap Bitmap, float left, float top, paint paint)

2, to the picture splicing and limits the display area

Drawbitmap (Bitmap Bitmap, Rect src, RECTF DST, paint paint);

Rect src: The image is cropped, and if NULL, the entire picture is displayed

RECTF DST: Is the area that the picture displays in the canvas canvas,
Larger than SRC enlarges the SRC cut-off area,
Smaller than Src narrows the SRC cut-off area.

Canvas using Drawbitmap to draw pictures in Android