AndroidGraphics.java 文件源码

public void fillRectRadialGradient(int startColor, int endColor, int x, int y, int width, int height, float relativeX, float relativeY, float relativeSize) {
    boolean antialias = paint.isAntiAlias();
    paint.setStyle(Paint.Style.FILL);
    paint.setAntiAlias(false);
    paint.setAlpha(255);
    float radius = Math.min((float)width, (float)height) * relativeSize;
    int centerX = (int) (width * (1 - relativeX));
    int centerY = (int) (height * (1 - relativeY));

    paint.setShader(new RadialGradient(x + centerX, y + centerY, radius, 0xff000000 | startColor, 0xff000000 | endColor, Shader.TileMode.MIRROR));
    canvas.save();
    applyTransform();
    canvas.drawRect(x, y, x + width, y + height, paint);
    paint.setAntiAlias(antialias);
    paint.setShader(null);
    unapplyTransform();
    canvas.restore();
}