如何实现扇形的绘制

Question

请问如何实现扇形的绘制。发现很多WPF中的东西都不能用。而且角度不是固定的。所以好像也不能用路径画出来。剪裁又好像只有矩形剪裁。请问有什么方法实现任意角度扇形的绘制。又或者像WIN8.1闹钟那种畸形图像有什么好的思路实现呢？

Answer 1

你好，使用Path类也不行么？

--James

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Answer 2

你好。

Windows Store 应用中的扇形绘制可以采用Polygon (NameSpace:Windows.UI.Xaml.Shapes;)来进行模拟。

比如我要绘制一个90度的扇形，半径为100像素：

Polygon p = new Polygon();
p.Fill = new SolidColorBrush(Colors.Red);
p.Points.Add(new Point(100, 100));
for (int i = 0; i < 90; i++)
{
    Point point = new Point()
    {
        X = 100 + Math.Sin(i * Math.PI / 180.0) * 100,
        Y = 100 + Math.Cos(i * Math.PI / 180.0) * 100,
    };
    p.Points.Add(point);
}
p.Points.Add(new Point(100, 100));
root.Children.Add(p);

这样我利用90个点，加上两个相同的端点（Polygon要求Points为封闭集合），完成了扇形的模拟。

以下是效果图：

Answer 3

谢谢大侠们的帮助！

Answer 4

你好，我这里还有一些办法可以画扇形。

具体可以这么做，首先在Blend里面画如下图形，一个圆和一个长方形，同时选中他们之后合并->相减，就可以出一个半圆：

选择合并->相减，得到一个半圆。之后重复同样的动作，之后仅仅把长方形做一个旋转，再进行相减，就可以得到你想要的扇形。

--James

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Answer 5

这样可以得出一个用XAML Path来表示的扇形：

	<Path Data="M100,0 C136.243,-1E-05 167.984,19.2815 185.523,48.1463 L186.592,50.0061 L100,100 L0,100 C3E-06,44.7715 44.7715,-1.1E-05 100,0 z" Fill="#FFF4F4F5" Margin="583,284,596.408,384" Stretch="Fill" UseLayoutRounding="False"/>  

效果如下：

当然你可以后台加载这个图形，通过XamlReader class 这个类可以帮助加载XAML。

--James

---

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