chart.aspx

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<%@ Page Language="C#" %>
<%@import namespace="System.Drawing"%>
<%@import namespace="System.Drawing.Drawing2D"%>
<%@import namespace="System.Drawing.Imaging"%>
<%-- OutputCache Duration="60" VaryByParam="Length;Style"--%>
<script language="c#" runat="server">
readonly static Color[][] brushes=new Color[][]{
 new Color[]{Color.FromArgb( 50 ,Color.Pink  ),Color.FromArgb( 120 ,Color.Purple)},
 new Color[]{Color.FromArgb( 50 ,Color.Purple  ),Color.FromArgb( 120 ,Color.Pink)}
};

public void page_load(Object obj,EventArgs e)
 {
	int height = 16;
	int style = 0;
	int width = 20;
	try{
	string param = Request["Length"];
	if (param==null||param.Equals("")) param="0";
	width = int.Parse( param );
	param = Request["Style"];
	if (param==null||param.Equals("")) style=0;
	else	style = int.Parse( param );
	}catch{}
	if(style<0||style>=brushes.Length) return;
	//创建一个bitmap实例
	Bitmap bitmap=new Bitmap(width+1,height+1);
	Graphics graphics=Graphics.FromImage(bitmap);

	//画一个白色背景
	graphics.FillRectangle(new SolidBrush(Color.White), 0, 0, width+1, height+1);
	if(width==0) goto output;
	//画一个矩形
    Rectangle r = new Rectangle(1, 1, width, height);
    LinearGradientBrush lb = new LinearGradientBrush(r, brushes[style][0], brushes[style][1], LinearGradientMode.Horizontal);
    graphics.FillRectangle(lb, r);
	//从网页输出
	output:
	Response.ContentType="image/jpeg";
	bitmap.Save(Response.OutputStream,ImageFormat.Jpeg);

	graphics.Dispose();
	bitmap.Dispose();
}
</script>