如何使用线性渐变填充Android中的路径?

时间:2010-05-14 17:09:17

标签: android graphics path fill

给定一个封闭的Path对象结果如下:

enter image description here

虽然这是一个矩形,我正在寻找适用于任何封闭路径的东西。

2 个答案:

答案 0 :(得分:75)

虽然steelbytes的回答可能会让你更好地控制渐变的各个部分,但你可以不用这条路径来做:

protected void onDraw(Canvas canvas)
{
    super.onDraw(canvas);
    Paint p = new Paint();
    // start at 0,0 and go to 0,max to use a vertical
    // gradient the full height of the screen.
    p.setShader(new LinearGradient(0, 0, 0, getHeight(), Color.BLACK, Color.WHITE, Shader.TileMode.MIRROR));
    canvas.drawPaint(p);
}

答案 1 :(得分:29)

这可能会有所帮助

protected void onDraw(Canvas canvas)
{
    super.onDraw(canvas);
    int w = getWidth();
    int h = getHeight();
    Paint p = new Paint(Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG);
    Path pth = new Path();
    pth.moveTo(w*0.27f,0);
    pth.lineTo(w*0.73f,0);
    pth.lineTo(w*0.92f,h);
    pth.lineTo(w*0.08f,h);
    pth.lineTo(w*0.27f,0);
    p.setColor(0xff800000);
    p.setShader(new LinearGradient(0,0,0,h,0xff000000,0xffffffff,Shader.TileMode.CLAMP));
    canvas.drawPath(pth,p);
}