MyGradientView.java 文件源码

/**
     * 位图图像渲染
     * @param canvas
     */
    private void studyBitmapShader(Canvas canvas) {
        //创建BitmapShader
        //其中TileMode.MIRROR x方向镜像  TileMode.REPEAT y方向重复
        mBitmapShader = new BitmapShader(mBitMap, Shader.TileMode.MIRROR, Shader.TileMode.REPEAT);

        //创建矩阵   来缩放图片
        Matrix matrix = new Matrix();
        matrix.setScale(0.2f,0.2f);
        mBitmapShader.setLocalMatrix(matrix);

        mPaint.setAntiAlias(true);
        mPaint.setShader(mBitmapShader);

        //画圆形的图片
//        canvas.drawCircle(mBitMap.getWidth()/2,mBitMap.getHeight()/2,300,mPaint);

        //画矩形的图片
//        Rect rect = new Rect(0,0,600,600);
//        canvas.drawRect(rect,mPaint);
//
        //画椭圆的图片
//        RectF rectf = new RectF(0,0,400,300);
//
//        canvas.drawOval(rectf,mPaint);

        //用shapeDrawable 实现圆形图片
        ShapeDrawable shapeDrawable = new ShapeDrawable(new OvalShape());
        shapeDrawable.getPaint().setShader(mBitmapShader);
        shapeDrawable.setBounds(0,0,400,400);
        shapeDrawable.draw(canvas);

    }