winform GDI基础（二）画带圆角的矩形框

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private void Form1_Paint(object sender, PaintEventArgs e)       {           Graphics g = e.Graphics;           g.SmoothingMode = SmoothingMode.HighQuality;//去掉锯齿           g.CompositingQuality = CompositingQuality.HighQuality;//合成图像的质量           g.TextRenderingHint = TextRenderingHint.SingleBitPerPixelGridFit;//去掉文字的锯齿           System.Drawing.Pen p = new System.Drawing.Pen(Color.FromArgb(255, 146, 126, 102), 2);             drawRoundedRect(g, p, 20, 20, 200, 200, 20);       }         /// <summary>       /// 带圆角矩形       /// </summary>       /// <param name="radius">圆角半径</param>       private void drawRoundedRect(Graphics g, System.Drawing.Pen pen, int x, int y, int width, int height, int radius)       {           //去掉圆角的锯齿           g.SmoothingMode = SmoothingMode.HighQuality;             //上           g.DrawLine(pen, new PointF(x + radius, y), new PointF(x + width - radius, y));           //下           g.DrawLine(pen, new PointF(x + radius, y + height), new PointF(x + width - radius, y + height));           //左           g.DrawLine(pen, new PointF(x, y + radius), new PointF(x, y + height - radius));           //右           g.DrawLine(pen, new PointF(x + width, y + radius), new PointF(x + width, y + height - radius));             //左上角           g.DrawArc(pen, new Rectangle(x, y, radius * 2, radius * 2), 180, 90);           //右上角           g.DrawArc(pen, new Rectangle(x + width - radius * 2, y, radius * 2, radius * 2), 270, 90);           //左下角           g.DrawArc(pen, new Rectangle(x, y + height - radius * 2, radius * 2, radius * 2), 90, 90);           //右下角           g.DrawArc(pen, new Rectangle(x + width - radius * 2, y + height - radius * 2, radius * 2, radius * 2), 0, 90);       }