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"Android" Setxfermode properties

I. The following xfermode subclasses can change this behavior:

AVOIDXFERMODE specifies a color and tolerance, forcing paint to avoid drawing on it (or just drawing on it).

Pixelxorxfermode a simple pixel XOR operation is applied when the existing color is overwritten.

Porterduffxfermode This is a very powerful conversion mode, using it, you can use any of the 16 porter-duff rules of the image composition to control how paint interacts with existing canvas images.

To apply the conversion mode, you can use the Setxfermode method as follows:

Avoidxfermode avoid = new Avoidxfermode (Color.Blue, Avoidxfermode.mode.    AVOID); Borderpen.setxfermode (avoid);

Two. Porter-duff:

Three. 16 Porter-duff rules

1.porterduff.mode.clear

The drawing is not submitted to the canvas.
2.porterduff.mode.src

Show Top Draw picture
3.porterduff.mode.dst

Show Lower drawing pictures
4.porterduff.mode.src_over

Normal drawing shows that the upper and lower layers are drawn with overlapping covers.
5.porterduff.mode.dst_over

The upper and lower layers are displayed. The lower level is shown on the home.
6.porterduff.mode.src_in

Draw the intersection of two layers. Displays the upper layer.
7.porterduff.mode.dst_in

Draw the intersection of two layers. Displays the lower layer.
8.porterduff.mode.src_out

Draw the non-intersecting portion of the upper layer.
9.porterduff.mode.dst_out

Remove the layer to draw the non-intersecting part.
10.porterduff.mode.src_atop

Remove the non-intersecting part of the layer from the upper intersection section
11.porterduff.mode.dst_atop

Take the upper non-intersecting part and the lower part of the intersection
12.porterduff.mode.xor

13.porterduff.mode.darken

14.porterduff.mode.lighten

15.porterduff.mode.multiply

16.porterduff.mode.screen

Rex--ios Android Arduino Mobile Internet