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【CSharp】图片加上边框

作者:netCode / 发布于2015/11/4/ 621


	Image img = Bitmap.FromFile(openFileDialog1.FileName.ToString());
	int bordwidth = Convert.ToInt32(img.Width * 0.1);
	int bordheight = Convert.ToInt32(img.Height * 0.1);

	int newheight = img.Height + bordheight;
	int newwidth = img.Width + bordwidth;

	Color bordcolor = Color.Black;
	Bitmap bmp = new Bitmap(newwidth, newheight);
	Graphics g = Graphics.FromImage(bmp);

	g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
	g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
	g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

	int Style = 0; //New: 绘制边框的类型, 手动修改0,1,2 可改变边框类型
	if (Style == 0) //New: 整个边框.
	{
	 //Changed: 修改rec区域, 将原图缩放. 适合边框内
	 System.Drawing.Rectangle rec = new Rectangle(bordwidth / 2, bordwidth / 2, newwidth - bordwidth / 2, newheight - bordwidth / 2);
	 g.DrawImage(img, rec, 0, 0, img.Width, img.Height, GraphicsUnit.Pixel);
	 g.DrawRectangle(new Pen(bordcolor, bordheight), 0, 0, newwidth, newheight);
	}
	else if (Style == 1) //New: 上下边框.
	{
	 System.Drawing.Rectangle rec = new Rectangle(0, bordwidth / 2, newwidth, newheight - bordwidth / 2);
	 g.DrawImage(img, rec, 0, 0, img.Width, img.Height, GraphicsUnit.Pixel);
	 g.DrawLine(new Pen(bordcolor, bordheight), 0, 0, newwidth, 0);
	 g.DrawLine(new Pen(bordcolor, bordheight), 0, newheight, newwidth, newheight);
	}
	else if (Style == 2) //New: 左右边框.
	{
	 System.Drawing.Rectangle rec = new Rectangle(bordwidth / 2, 0, newwidth - bordwidth / 2, newheight);
	 g.DrawImage(img, rec, 0, 0, img.Width, img.Height, GraphicsUnit.Pixel);
	 g.DrawLine(new Pen(bordcolor, bordheight), 0, 0, 0, newheight);
	 g.DrawLine(new Pen(bordcolor, bordheight), newwidth, 0, newwidth, newheight);
	}

	bmp.Save(DateTime.Now.ToString("mmssfff")+".jpg");
	g.Dispose();

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