按钮C#(WinForms)中的圆角边

Question

你好,通过这里和其他网站的一些研究,我做了一个圆角边缘按钮.

protected override void OnPaint(PaintEventArgs e)
{
    base.OnPaint(e);
    Rectangle Rect = new Rectangle(0, 0, this.Width, this.Height);
    GraphicsPath GraphPath = new GraphicsPath();
    GraphPath.AddArc(Rect.X, Rect.Y, 50, 50, 180, 90);
    GraphPath.AddArc(Rect.X + Rect.Width - 50, Rect.Y, 50, 50, 270, 90);
    GraphPath.AddArc(Rect.X + Rect.Width - 50, Rect.Y + Rect.Height - 50, 50, 50, 0, 90);
    GraphPath.AddArc(Rect.X, Rect.Y + Rect.Height - 50, 50, 50, 90, 90);
    this.Region = new Region(GraphPath);
}

我面临的问题是按钮的"蓝色突出显示":它显示在大部分按钮上,但它没有显示在圆形边缘上,因此我的按钮部分突出显示,部分不突出显示(在边缘上).我该怎么做才能解决这个问题？谢谢.

PS:我不能使用WPF.该应用程序适用于非常旧的计算机; 所以,请不要建议.此外,客户没有钱购买新电脑.

Answer 1

这是一个快速的,你可能想要微调和优化一些细节..

class RoundedButton : Button
{
   GraphicsPath GetRoundPath(RectangleF Rect, int radius)
   {
      float r2 = radius / 2f;
      GraphicsPath GraphPath = new GraphicsPath();
      GraphPath.AddArc(Rect.X, Rect.Y, radius, radius, 180, 90);
      GraphPath.AddLine(Rect.X + r2, Rect.Y, Rect.Width - r2, Rect.Y);
      GraphPath.AddArc(Rect.X + Rect.Width - radius, Rect.Y, radius, radius, 270, 90);
      GraphPath.AddLine(Rect.Width, Rect.Y + r2, Rect.Width, Rect.Height - r2);
      GraphPath.AddArc(Rect.X + Rect.Width - radius, 
                       Rect.Y + Rect.Height - radius, radius, radius, 0, 90);
      GraphPath.AddLine(Rect.Width - r2, Rect.Height, Rect.X + r2, Rect.Height);
      GraphPath.AddArc(Rect.X, Rect.Y + Rect.Height - radius, radius, radius, 90, 90);
      GraphPath.AddLine(Rect.X, Rect.Height - r2, Rect.X, Rect.Y + r2);
      GraphPath.CloseFigure();
      return GraphPath;
   }

   protected override void OnPaint(PaintEventArgs e)
   {
      base.OnPaint(e);
      RectangleF Rect = new RectangleF(0, 0, this.Width, this.Height);
      using (GraphicsPath GraphPath = GetRoundPath(Rect, 50))
      {
        this.Region = new Region(GraphPath);
        using (Pen pen = new Pen(Color.CadetBlue, 1.75f))
        {
            pen.Alignment = PenAlignment.Inset;
            e.Graphics.DrawPath(pen, GraphPath);
        }
      }
   }
}

显然,由于我们有一个类,我们可以缓存GraphicsPath一个类变量.当然你选择颜色..

Answer 2

这是对 TaW 答案的一个调整，可以更轻松地调整 borderRadius 和 borderThickness。如果边框和按钮背景颜色之间出现随机空白，则需要调整 m。

public class RoundedButton : Button
{
  GraphicsPath GetRoundPath(RectangleF Rect, int radius)
  {
    float m = 2.75F;
    float r2 = radius / 2f;
    GraphicsPath GraphPath = new GraphicsPath();

    GraphPath.AddArc(Rect.X + m, Rect.Y + m, radius, radius, 180, 90);
    GraphPath.AddLine(Rect.X + r2 + m, Rect.Y + m, Rect.Width - r2 - m, Rect.Y + m);
    GraphPath.AddArc(Rect.X + Rect.Width - radius - m, Rect.Y + m, radius, radius, 270, 90);
    GraphPath.AddLine(Rect.Width - m, Rect.Y + r2, Rect.Width - m, Rect.Height - r2 - m);
    GraphPath.AddArc(Rect.X + Rect.Width - radius - m,
                   Rect.Y + Rect.Height - radius - m, radius, radius, 0, 90);
    GraphPath.AddLine(Rect.Width - r2 - m, Rect.Height - m, Rect.X + r2 - m, Rect.Height - m);
    GraphPath.AddArc(Rect.X + m, Rect.Y + Rect.Height - radius - m, radius, radius, 90, 90);
    GraphPath.AddLine(Rect.X + m, Rect.Height - r2 - m, Rect.X + m, Rect.Y + r2 + m);

    GraphPath.CloseFigure();
    return GraphPath;
  }

  protected override void OnPaint(PaintEventArgs e)
  {
    int borderRadius = 50;
    float borderThickness = 1.75f;
    base.OnPaint(e);
    RectangleF Rect = new RectangleF(0, 0, this.Width, this.Height);
    GraphicsPath GraphPath = GetRoundPath(Rect, borderRadius);

    this.Region = new Region(GraphPath);
    using (Pen pen = new Pen(Color.Silver, borderThickness))
    {
      pen.Alignment = PenAlignment.Inset;
      e.Graphics.DrawPath(pen, GraphPath);
    }
  }
}

干杯!