c# - 如何在 C# 中创建带圆角的图像？

Question

我想用 GDI+ 创建带圆角的图像(来自另一个图像)。执行此操作的最佳方法是什么？

PS:它不适用于网络，所以我不能使用客户端 CSS

Answer 1

这个函数似乎可以做你想做的。如果需要，还可以轻松修改它以返回位图。您还需要清理不再需要的任何图像等。改编自: http://www.jigar.net/howdoi/viewhtmlcontent98.aspx

using System.Drawing;
using System.Drawing.Drawing2D;

public Image RoundCorners(Image StartImage, int CornerRadius, Color BackgroundColor)
{
    CornerRadius *= 2;
    Bitmap RoundedImage = new Bitmap(StartImage.Width, StartImage.Height);
    using(Graphics g = Graphics.FromImage(RoundedImage))
    {
      g.Clear(BackgroundColor);
      g.SmoothingMode = SmoothingMode.AntiAlias;
      Brush brush = new TextureBrush(StartImage);
      GraphicsPath gp = new GraphicsPath();
      gp.AddArc(0, 0, CornerRadius, CornerRadius, 180, 90);
      gp.AddArc(0 + RoundedImage.Width - CornerRadius, 0, CornerRadius, CornerRadius, 270, 90);
      gp.AddArc(0 + RoundedImage.Width - CornerRadius, 0 + RoundedImage.Height - CornerRadius, CornerRadius, CornerRadius, 0, 90);
      gp.AddArc(0, 0 + RoundedImage.Height - CornerRadius, CornerRadius, CornerRadius, 90, 90);
      g.FillPath(brush, gp);
      return RoundedImage;
    }
}

Image StartImage = Image.FromFile("YourImageFile.jpg");
Image RoundedImage = this.RoundCorners(StartImage, 25, Color.White);
//Use RoundedImage...