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  • C# 提供两种切割圆形图片的方式

    效果:

            private void Form1_Load(object sender, EventArgs e)
            {
                string file =System.IO.Path.Combine(Environment.CurrentDirectory, @"11.jpg");
                try
                {
                    Image i = new Bitmap(file);
                    pbO.Image = i;
    
                    pbD1.Image = WayOne(file);
                    pbD2.Image = WayTwo(file);
    
                    pbS1.Image = WaySOne(file);
                    pbS2.Image = WaySTwo(file);
    
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
            private Bitmap WayOne(string file)
            {
                using (Image i = new Bitmap(file))
                {
                    Bitmap b = new Bitmap(i.Width, i.Height);
                    using (Graphics g = Graphics.FromImage(b))
                    {
                        g.FillEllipse(new TextureBrush(i), 0, 0, i.Width, i.Height);
                    }
                    return b;
                }
            }
            private Bitmap WayTwo(string file)
            {
                using (Image i = new Bitmap(file))
                {
                    Bitmap b = new Bitmap(i.Width, i.Height);
                    using (Graphics g = Graphics.FromImage(b))
                    {
                        g.DrawImage(i, 0, 0, b.Width, b.Height);
                        int r = Math.Min(b.Width, b.Height) / 2;
                        PointF c = new PointF(b.Width / 2.0F, b.Height / 2.0F);
                        for (int h = 0; h < b.Height; h++)
                            for (int w = 0; w < b.Width; w++)
                                if ((int)Math.Pow(r, 2) < ((int)Math.Pow(w * 1.0 - c.X, 2) + (int)Math.Pow(h * 1.0 - c.Y, 2)))
                                {
                                    b.SetPixel(w, h, Color.Transparent);
                                }
                    }
                    return b;
                }
            }
    
            private Bitmap WaySOne(string file)
            {
                using (Image i = new Bitmap(file))
                {
                    Bitmap b = new Bitmap(i.Width, i.Height);
                    using (Graphics g = Graphics.FromImage(b))
                    {
                        g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                        using (System.Drawing.Drawing2D.GraphicsPath p = new System.Drawing.Drawing2D.GraphicsPath(System.Drawing.Drawing2D.FillMode.Alternate))
                        {
                            p.AddEllipse(0, 0, i.Width, i.Height);
                            g.FillPath(new TextureBrush(i), p);
                        }
                        //g.FillEllipse(new TextureBrush(i), 0, 0, i.Width, i.Height);
                    }
                    return b;
                }
            }
            private Bitmap WaySTwo(string file)
            {
                using (Image i = new Bitmap(file))
                {
                    Bitmap b = new Bitmap(i.Width, i.Height);
                    using (Graphics g = Graphics.FromImage(b))
                    {
                        g.DrawImage(i, 0, 0, b.Width, b.Height);
                        int r = Math.Min(b.Width, b.Height) / 2;
                        PointF c = new PointF(b.Width / 2.0F, b.Height / 2.0F);
                        for (int h = 0; h < b.Height; h++)
                            for (int w = 0; w < b.Width; w++)
                                if ((int)Math.Pow(r, 2) < ((int)Math.Pow(w * 1.0 - c.X, 2) + (int)Math.Pow(h * 1.0 - c.Y, 2)))
                                {
                                    b.SetPixel(w, h, Color.Transparent);
                                }
                        //画背景色圆
                        using (Pen p = new Pen(System.Drawing.SystemColors.Control))
                            g.DrawEllipse(p, 0, 0, b.Width, b.Height);
                    }
                    return b;
                }
            }
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  • 原文地址:https://www.cnblogs.com/wjshan0808/p/5909174.html
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