WPF的rectangle做成一边圆角一边直角代码

在WPF中，可以通过自定义控件来实现一边圆角一边直角的矩形。以下是一个示例代码：

public class PartiallyRoundedRectangle : Shape
{
    public static readonly DependencyProperty RadiusXProperty =
        DependencyProperty.Register("RadiusX", typeof(double), typeof(PartiallyRoundedRectangle), new FrameworkPropertyMetadata(0.0, FrameworkPropertyMetadataOptions.AffectsRender));
    public static readonly DependencyProperty RadiusYProperty =
        DependencyProperty.Register("RadiusY", typeof(double), typeof(PartiallyRoundedRectangle), new FrameworkPropertyMetadata(0.0, FrameworkPropertyMetadataOptions.AffectsRender));
    public static readonly DependencyProperty RoundTopLeftProperty =
        DependencyProperty.Register("RoundTopLeft", typeof(bool), typeof(PartiallyRoundedRectangle), new FrameworkPropertyMetadata(false, FrameworkPropertyMetadataOptions.AffectsRender));
    public static readonly DependencyProperty RoundTopRightProperty =
        DependencyProperty.Register("RoundTopRight", typeof(bool), typeof(PartiallyRoundedRectangle), new FrameworkPropertyMetadata(false, FrameworkPropertyMetadataOptions.AffectsRender));
    public static readonly DependencyProperty RoundBottomLeftProperty =
        DependencyProperty.Register("RoundBottomLeft", typeof(bool), typeof(PartiallyRoundedRectangle), new FrameworkPropertyMetadata(false, FrameworkPropertyMetadataOptions.AffectsRender));
    public static readonly DependencyProperty RoundBottomRightProperty =
        DependencyProperty.Register("RoundBottomRight", typeof(bool), typeof(PartiallyRoundedRectangle), new FrameworkPropertyMetadata(false, FrameworkPropertyMetadataOptions.AffectsRender));

    public double RadiusX
    {
        get { return (double)GetValue(RadiusXProperty); }
        set { SetValue(RadiusXProperty, value); }
    }

    public double RadiusY
    {
        get { return (double)GetValue(RadiusYProperty); }
        set { SetValue(RadiusYProperty, value); }
    }

    public bool RoundTopLeft
    {
        get { return (bool)GetValue(RoundTopLeftProperty); }
        set { SetValue(RoundTopLeftProperty, value); }
    }

    public bool RoundTopRight
    {
        get { return (bool)GetValue(RoundTopRightProperty); }
        set { SetValue(RoundTopRightProperty, value); }
    }

    public bool RoundBottomLeft
    {
        get { return (bool)GetValue(RoundBottomLeftProperty); }
        set { SetValue(RoundBottomLeftProperty, value); }
    }

    public bool RoundBottomRight
    {
        get { return (bool)GetValue(RoundBottomRightProperty); }
        set { SetValue(RoundBottomRightProperty, value); }
    }

    protected override Geometry DefiningGeometry
    {
        get
        {
            double width = RenderSize.Width;
            double height = RenderSize.Height;
            double radiusX = Math.Min(RadiusX, width / 2);
            double radiusY = Math.Min(RadiusY, height / 2);
            double topLeft = RoundTopLeft ? 1 : 0;
            double topRight = RoundTopRight ? 1 : 0;
            double bottomLeft = RoundBottomLeft ? 1 : 0;
            double bottomRight = RoundBottomRight ? 1 : 0;

            StreamGeometry geometry = new StreamGeometry();
            using (StreamGeometryContext context = geometry.Open())
            {
                context.BeginFigure(new Point(radiusX, 0), true, true);
                context.LineTo(new Point(width - radiusX, 0), true, false);
                context.ArcTo(new Point(width, radiusY), new Size(radiusX, radiusY), 0, topRight == 1, SweepDirection.Clockwise, true, false);
                context.LineTo(new Point(width, height - radiusY), true, false);
                context.ArcTo(new Point(width - radiusX, height), new Size(radiusX, radiusY), 0, bottomRight == 1, SweepDirection.Clockwise, true, false);
                context.LineTo(new Point(radiusX, height), true, false);
                context.ArcTo(new Point(0, height - radiusY), new Size(radiusX, radiusY), 0, bottomLeft == 1, SweepDirection.Clockwise, true, false);
                context.LineTo(new Point(0, radiusY), true, false);
                context.ArcTo(new Point(radiusX, 0), new Size(radiusX, radiusY), 0, topLeft == 1, SweepDirection.Clockwise, true, false);
            }

            geometry.Freeze();
            return geometry;
        }
    }
}

使用方法如下：

<local:PartiallyRoundedRectangle RadiusX="10" RadiusY="10" RoundTopLeft="True" Fill="LightBlue" Height="100" Width="200"/>

其中，RadiusX和RadiusY分别表示矩形的横向和纵向圆角半径，RoundTopLeft、RoundTopRight、RoundBottomLeft、RoundBottomRight分别表示矩形的四个角是否为圆角。