Android Shader color, image rendering

Shader

Shader is a base class that represents the horizontal span of a color during drawing

Its subclasses are embedded in the paint to be used, calling Paint.setshader (shader).

Other than bitmap, colors are obtained from shader when drawing with the paint

Shader.tilemode Rendering Mode

public enum Tilemode {     CLAMP   (0),    REPEAT  (1),    MIRROR  (2);    Tilemode (int nativeint) {        this.nativeint = nativeint;    }    final int nativeint;}

CLAMP: If the original bounds (that is, the border of the artwork) is exceeded, the color on the repeating edge

REPEAT: Repeat Bitmap

MIRROR: Repeat bitmap, unlike repeat, it is a mirror repetition, namely: reverse repetition

Shader sub-class:

Bitmapshader (android.graphics) Image rendering
Composeshader (android.graphics) combo rendering
LinearGradient (android.graphics) Linear rendering
Radialgradient (android.graphics) ring rendering
Sweepgradient (android.graphics) scan rendering

Bitmapshader

New Bitmapshader (Bitmap, Shader.TileMode.REPEAT, Shader.TileMode.MIRROR); Render an image in a rendering mode

Composeshader

New Composeshader (Shadera, Shaderb, PorterDuff.Mode.DST); Combine two rendering effects to Porterduff.mode

LinearGradient

New LinearGradient (0, 0, bitmap.getwidth (), Bitmap.getheight (), 0x470000ff,0xefffff00, Shader.TileMode.CLAMP);

Linear variation between two colors within a certain area, in a certain rendering mode

New LinearGradient (0, 0, bitmap.getwidth (), Bitmap.getheight (), New int[]{0xffabc777, 0x2300ff00, 0X470000FF, 0XEFFFFF00}, New float[]{0.1f, 0.3f, 0.5f, 1.0f}, Shader.TileMode.CLAMP);

In a certain area, in a certain rendering mode, a set of color between the linear change, the position of change is determined by the float array. requires an array of int and float, consistent in length

Radialgradient

Ring rendering with dots (x, y) and radius r

New Radialgradient (W/2, H/2, Math.min (W, h)/2, 0xddff00f0, 0xffabc777, Shader.TileMode.REPEAT);

New Radialgradient (W/2, H/2, Math.min (W, h)/2, New int[]{0xddff0000, 0x2300ff00, 0X470000FF, 0xffabc777}, new float[]{0.1 F, 0.3f, 0.5f, 1.0f}, Shader.TileMode.CLAMP);

Sweepgradient

Scan rendering with dots (x, y)

New Sweepgradient (W/2, H/2, 0xddff00f0, 0xffabc777);

New Sweepgradient (W, H, New int[]{0xffff0000, 0xff00ff00, 0xff0000ff, 0xffabc777, 0xffee00ee}, New float[]{0.2f, 0.4f, 0.6 F, 0.75f, 1f});

Porterduff.mode

canvas . Drawbitmap (mdstb   0   0   paint) ;//draw the target first  Paint.setxfermode (  smodes   [i]) ;//use mode  canvas . Drawbitmap (MSRCB   0   0   paint) ;//Redraw source  paint.setxfermode (null ) ;//clear mode  

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Android Shader color, image rendering