如何在c#中绘制圆角矩形

本文关键字：圆角 绘制 | 更新日期: 2023-09-27 18:23:46

我正在使用此代码制作一个圆角矩形。但它只画矩形的左上角和右上角，而且它并没有完成下半部分的矩形。如何使其完整和充满。我应该做什么改变？

public static Bitmap DrawRoundedRectangle(Bitmap Image, Color BoxColor, int XPosition, int YPosition,
        int Height, int Width, int CornerRadius)
    {
     Bitmap NewBitmap = new Bitmap(Image, Image.Width, Image.Height);
     using (Graphics NewGraphics = Graphics.FromImage(NewBitmap))
    {
        using (Pen BoxPen = new Pen(BoxColor))
        {
            using (GraphicsPath Path = new GraphicsPath())
            {
                   Path.AddLine(XPosition + CornerRadius, YPosition, XPosition + Width - (CornerRadius * 2), YPosition);
                    Path.AddArc(XPosition + Width - (CornerRadius * 2), YPosition, CornerRadius * 2, CornerRadius * 2, 270, 90);
                  Path.AddLine(XPosition + Width, YPosition + CornerRadius, XPosition + Width, YPosition + Height - (CornerRadius * 2));
                    Path.AddArc(XPosition + Width - (CornerRadius * 2), YPosition + Height - (CornerRadius * 2), CornerRadius * 2, CornerRadius * 2, 0, 90);
                 Path.AddLine(XPosition + Width - (CornerRadius * 2), YPosition + Height, XPosition + CornerRadius, YPosition + Height);
                   Path.AddArc(XPosition, YPosition + Height - (CornerRadius * 2), CornerRadius * 2, CornerRadius * 2, 90, 90);
                   Path.AddLine(XPosition, YPosition + Height - (CornerRadius * 2), XPosition, YPosition + CornerRadius);
                    Path.AddArc(XPosition, YPosition, CornerRadius * 2, CornerRadius * 2, 180, 90);
                     Path.CloseFigure();
                     NewGraphics.DrawPath(BoxPen, Path);
                 }
              }
          }
         return NewBitmap;
     }

如何在c#中绘制圆角矩形

public static GraphicsPath RoundedRect(Rectangle bounds, int radius)
{
    int diameter = radius * 2;
    Size size = new Size(diameter, diameter);
    Rectangle arc = new Rectangle(bounds.Location, size);
    GraphicsPath path = new GraphicsPath();
    if (radius == 0)
    {
        path.AddRectangle(bounds);
        return path;
    }
    // top left arc  
    path.AddArc(arc, 180, 90);
    // top right arc  
    arc.X = bounds.Right - diameter;
    path.AddArc(arc, 270, 90);
    // bottom right arc  
    arc.Y = bounds.Bottom - diameter;
    path.AddArc(arc, 0, 90);
    // bottom left arc 
    arc.X = bounds.Left;
    path.AddArc(arc, 90, 90);
    path.CloseFigure();
    return path;
}

您可以为Graphics类型制作两种扩展方法，以便将它们用作常用的Draw...和Fill...形状绘制方法。

public static void DrawRoundedRectangle(this Graphics graphics, Pen pen, Rectangle bounds, int cornerRadius)
{
    if (graphics == null)
        throw new ArgumentNullException(nameof(graphics));
    if (pen == null)
        throw new ArgumentNullException(nameof(pen));
    using (GraphicsPath path = RoundedRect(bounds, cornerRadius))
    {
        graphics.DrawPath(pen, path);
    }
}
public static void FillRoundedRectangle(this Graphics graphics, Brush brush, Rectangle bounds, int cornerRadius)
{
    if (graphics == null)
        throw new ArgumentNullException(nameof(graphics));
    if (brush == null)
        throw new ArgumentNullException(nameof(brush));
    using(GraphicsPath path = RoundedRect(bounds, cornerRadius))
    {
        graphics.FillPath(brush, path);
    }
}

更新2020：

最近我公开了我的绘图库（NuGet）。可以随意探索GraphicsExtensions类以获得更多重载（每个角的自定义角半径）和其他好处。

我为那些想要不同角落的人修改了György Köszeg的答案。

public static GraphicsPath RoundedRect(Rectangle bounds, int radius1, int radius2, int radius3, int radius4)
    {
        int diameter1 = radius1 * 2;
        int diameter2 = radius2 * 2;
        int diameter3 = radius3 * 2;
        int diameter4 = radius4 * 2;
        Rectangle arc1 = new Rectangle(bounds.Location, new Size(diameter1, diameter1));
        Rectangle arc2 = new Rectangle(bounds.Location, new Size(diameter2, diameter2));
        Rectangle arc3 = new Rectangle(bounds.Location, new Size(diameter3, diameter3));
        Rectangle arc4 = new Rectangle(bounds.Location, new Size(diameter4, diameter4));
        GraphicsPath path = new GraphicsPath();
        // top left arc  
        if (radius1 == 0)
        {
            path.AddLine(arc1.Location, arc1.Location);
        }
        else
        {
            path.AddArc(arc1, 180, 90);
        }
        // top right arc  
        arc2.X = bounds.Right - diameter2;
        if (radius2 == 0)
        {
            path.AddLine(arc2.Location, arc2.Location);
        }
        else
        {
            path.AddArc(arc2, 270, 90);
        }
        // bottom right arc  
        arc3.X = bounds.Right - diameter3;
        arc3.Y = bounds.Bottom - diameter3;
        if (radius3 == 0)
        {
            path.AddLine(arc3.Location, arc3.Location);
        }
        else
        {
            path.AddArc(arc3, 0, 90);
        }
        // bottom left arc 
        arc4.X = bounds.Right - diameter4;
        arc4.Y = bounds.Bottom - diameter4;
        arc4.X = bounds.Left;
        if (radius4 == 0)
        {
            path.AddLine(arc4.Location, arc4.Location);
        }
        else
        {
            path.AddArc(arc4, 90, 90);
        }
        path.CloseFigure();
        return path;
    }
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