android TileMode成效 水波纹效果 环形渐变

TileMode是一个枚举类，位于android.graphics.Shader类里面

android源码

    public enum TileMode {        /**         * replicate the edge color if the shader draws outside of its         * original bounds         */        CLAMP   (0),        /**         * repeat the shader's image horizontally and vertically         */        REPEAT  (1),        /**         * repeat the shader's image horizontally and vertically, alternating         * mirror images so that adjacent images always seam         */        MIRROR  (2);        TileMode(int nativeInt) {            this.nativeInt = nativeInt;        }        final int nativeInt;    }

今天主要测试这几个属性的效果。先将部分测试代码贴出来：

    private void drawTextRadial(Canvas canvas, RectF rectF) {        canvas.save();        float centerX = rectF.centerX();        float centerY = rectF.centerY();        float radius = rectF.height();        RadialGradient gradient = new RadialGradient(centerX, centerY, radius, Color.GREEN, Color.RED, TileMode.CLAMP);         Paint paint = new Paint();        paint.setAntiAlias(true);        paint.setStyle(Paint.Style.FILL);        paint.setTextSize(TEXTSIZE);        paint.setFakeBoldText(true);        paint.setShader(gradient);        canvas.drawText(mText, rectF.left, rectF.bottom, paint);        canvas.restore();    }

CLAMP看意思是 如果超出规定的区域就重复边缘的效果，看效果：

REPEAT的意思是 在竖直和水平方向上重复，看效果：

MIRROR的意思是 在竖直和水平方向上重复，以镜像的方式显示，看效果：