【asp】asp.net中生成饼状与柱状图实例-net--生成-饼状-柱状图

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asp.net中生成饼状与柱状图实例

using System;
using System.Collections.Generic;
using System.Text;
//
//using System.Data;
//using System.Web.UI.WebControls;
//
using System.Drawing;
using System.Drawing.Imaging;
 
namespace Tools
{
    public static class OWCImageHelp
    {
        /// <summary>
        /// 动态的生成柱状图和饼状图
        /// </summary>
        /// <param name="arrValueNames">行坐标要显示的字段</param>
        /// <param name="arrValues">纵坐标要显示的数字</param>
        /// <param name="title">标题</param>
        public static void GetZBImage(string[] arrValueNames, int[] arrValues, string title)
        {
            Bitmap objBitMap=new Bitmap(650, 300);
            Graphics objGraphics;
            objGraphics=Graphics.FromImage(objBitMap);
            objGraphics.Clear(Color.White);
            //int[] arrValues={ 40000, 32000, 24000, 30000, 36000, 28000 };
            //string[] arrValueNames=new string[] { "第一次", "第二次", "第三次", "第四次", "第五次", "第六次" };
            objGraphics.DrawString(title, new System.Drawing.Font("宋体", 16), Brushes.Blue, new PointF(5, 5));
            PointF symbolLeg=new PointF(335, 20);
            PointF descLeg=new PointF(360, 16);
            //画出说明部分的图形
            for (int i=0; i < arrValueNames.Length; i++)
            {
                objGraphics.FillRectangle(new SolidBrush(GetColor(i)), symbolLeg.X, symbolLeg.Y, 20, 10);
                objGraphics.DrawRectangle(Pens.Black, symbolLeg.X, symbolLeg.Y, 20, 10);
                objGraphics.DrawString(arrValueNames[i].ToString(), new System.Drawing.Font("宋体", 10), Brushes.Black, descLeg);
                symbolLeg.Y +=15;
                descLeg.Y +=15;
            }
            float TotalValues=0;
            for (int i=0; i <=arrValues.Length - 1; i++)
            {
                TotalValues +=arrValues[i];
            }
            //绘出矩形图。
            float Rectangleheight=0;
            PointF recLeg=new PointF(12, 200 - arrValues[0] / TotalValues * 300);
            for (int i=0; i < arrValues.Length; i++)
            {
                Rectangleheight=arrValues[i] / TotalValues * 300;
                objGraphics.FillRectangle(new SolidBrush(GetColor(i)), (i * 35) + 15, 200 - Rectangleheight, 20, Rectangleheight + 50);
                objGraphics.DrawRectangle(Pens.Black, (i * 35) + 15, 200 - Rectangleheight, 20, Rectangleheight + 50);
                recLeg.Y=200 - Rectangleheight - 14;
                objGraphics.DrawString(arrValues[i].ToString(), new System.Drawing.Font("宋体", 10), Brushes.Blue, recLeg);
                recLeg.X +=35;
            }
            //绘出圆形图。
            float sglCurrentAngle=0;
            float sglTotalAngle=0;
            for (int i=0; i < arrValues.Length; i++)
            {
                sglCurrentAngle=arrValues[i] / TotalValues * 360;
                objGraphics.FillPie(new SolidBrush(GetColor(i)), 220, 95, 100, 100, sglTotalAngle, sglCurrentAngle);
                objGraphics.DrawPie(Pens.Black, 220, 95, 100, 100, sglTotalAngle, sglCurrentAngle);
                sglTotalAngle +=sglCurrentAngle;
            }
            objBitMap.Save(System.Web.HttpContext.Current.Response.OutputStream, ImageFormat.Gif);
        }
        //定义颜色。
        private static Color GetColor(int itemIndex)
        {
            Color objColor;
            if (itemIndex==0)
            {
                objColor=Color.Maroon;
            }
            else if (itemIndex==1)
            {
                objColor=Color.Red;
            }
            else if (itemIndex==2)
            {
                objColor=Color.Gray;
            }
            else if (itemIndex==3)
            {
                objColor=Color.Blue;
            }
            else if (itemIndex==4)
            {
                objColor=Color.Orange;
            }
            else if (itemIndex==5)
            {
                objColor=Color.Cyan;
            }
            else if (itemIndex==6)
            {
                objColor=Color.Bisque;
            }
            else if (itemIndex==7)
            {
                objColor=Color.Maroon;
            }
            else if (itemIndex==8)
            {
                objColor=Color.Maroon;
            }
            else
            {
                objColor=Color.Blue;
            }
            return objColor;
        }
    }
}

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