制作统计图__柱状图/饼图__可直接调用(附全码)

【需求】
最近做了个稍微有点复杂的投票系统,竟然忙活了一周,汗!~   最后的投票统计,刚开始弄了个图片,根据数据来控制图片的长度,感觉太恶心了,而且没有技术含量,于是想弄个好看的图片来显示结果

【要点】
其实真做起来,发现主要是对Bitmap和Graphics两个类的简单操作,真正的难点还是数学的加减法,另外被除数为零的情况考虑下就行了.

【总结】
我把画统计图的方法抽出来了,供大家直接调用,我小学数学可是得过100分,做这玩意简直是小菜一碟!

【效果图】
下面那个统计就是控制图片的宽度来显示统计效果的.


【源码】前台页面没内容

  1using System;
  2using System.Collections;
  3using System.ComponentModel;
  4using System.Data;
  5using System.Drawing;
  6using System.Drawing.Imaging;
  7using System.Web;
  8using System.Web.SessionState;
  9using System.Web.UI;
 10using System.Web.UI.WebControls;
 11using System.Web.UI.HtmlControls;
 12
 13namespace Vote
 14{
 15    /**//// <summary>
 16    /// Chart 的摘要说明。
 17    /// </summary>
 18    public class Chart : System.Web.UI.Page
 19    {
 20        private void Page_Load(object sender, System.EventArgs e)
 21        {
 22            /**//*arrValues是数量
 23             *AXzhz是与数量对应的内容(只能显示10个汉字)
 24             *AX是主题
 25             *只要把这三个参数设置好了,调用Initialize()方法就OK了
 26             * */
 27            float[] arrValues={10,110,50,0};
 28            string[] AXzhz={"AX","AXzhz","斧头帮少帮主","Show me the money!"};
 29            string AX="Hello World!";
 30            Initialize(AX,arrValues,AXzhz);
 31        }
 32
 33        private void Initialize(string AX,float[] arrValues,string[] AXzhz)
 34        {            
 35            Graphics objGraphics;
 36            Bitmap objBitMap=new Bitmap(400,225);
 37            objGraphics=Graphics.FromImage(objBitMap);
 38            objGraphics.Clear(Color.White);
 39
 40            //画主题
 41            objGraphics.DrawString(AX,new Font("宋体",16),Brushes.Black,new Point(0,205));
 42
 43            PointF symbolLeg=new PointF(200,20);
 44            PointF descLeg=new PointF(225,20);
 45
 46            //求出总数
 47            float sglCurrentAngle=0;
 48            float sglTotalAngle=0;
 49
 50            for(int a=0;a<arrValues.Length;a++)
 51            {
 52                sglTotalAngle+=arrValues[a];
 53            }
 54
 55            //画出标识
 56            for(int i=0;i<arrValues.Length;i++)
 57            {
 58                objGraphics.DrawRectangle(Pens.Black,symbolLeg.X,symbolLeg.Y,20,10);    
 59                objGraphics.FillRectangle(new SolidBrush(GetColor(i)),symbolLeg.X,symbolLeg.Y,20,10);
 60                if(sglTotalAngle!=0)
 61                {
 62                    if(Convert.ToInt32(arrValues[i]*100/sglTotalAngle)<10)
 63                    {
 64                        objGraphics.DrawString(Convert.ToInt32(arrValues[i]*100/sglTotalAngle)+"%   "+AXzhz[i],new Font("宋体",10),Brushes.Black,descLeg);
 65                    }
 66                    else if(Convert.ToInt32(arrValues[i]*100/sglTotalAngle)==100)
 67                    {
 68                        objGraphics.DrawString(Convert.ToInt32(arrValues[i]*100/sglTotalAngle)+"% "+AXzhz[i],new Font("宋体",10),Brushes.Black,descLeg);
 69                    }
 70                    else
 71                    {
 72                        objGraphics.DrawString(Convert.ToInt32(arrValues[i]*100/sglTotalAngle)+"%  "+AXzhz[i],new Font("宋体",10),Brushes.Black,descLeg);
 73                    }
 74                }
 75                else
 76                {
 77                    objGraphics.DrawString("0% "+AXzhz[i],new Font("宋体",10),Brushes.Black,descLeg);
 78                }
 79                symbolLeg.Y+=15;
 80                descLeg.Y+=15;
 81            }
 82
 83            //画出矩形
 84            for(int j=0;j<arrValues.Length;j++)
 85            {
 86                if(sglTotalAngle!=0)
 87                {
 88                    objGraphics.FillRectangle(new SolidBrush(GetColor(j)),(j*35)+15,200-arrValues[j]*200/sglTotalAngle,20,arrValues[j]*200/sglTotalAngle+1);
 89                    objGraphics.DrawRectangle(Pens.Black,(j*35)+15,200-arrValues[j]*200/sglTotalAngle,20,arrValues[j]*200/sglTotalAngle+1);
 90                }
 91                else
 92                {
 93                    objGraphics.FillRectangle(new SolidBrush(GetColor(j)),(j*35)+15,199,20,arrValues[j]+1);
 94                    objGraphics.DrawRectangle(Pens.Black,(j*35)+15,199,20,arrValues[j]+1);
 95                }                
 96            }
 97
 98            //画圆
 99            float sum=0;
100            for(int b=0;b<arrValues.Length;b++)
101            {
102                if(sglTotalAngle!=0)
103                {
104                    sglCurrentAngle=arrValues[b]/sglTotalAngle*360;
105                    objGraphics.FillPie(new SolidBrush(GetColor(b)),220,110,100,100,sum,sglCurrentAngle);
106                    objGraphics.DrawPie(Pens.Black,220,110,100,100,sum,sglCurrentAngle);
107                    sum+=sglCurrentAngle;
108                }
109                else
110                {
111                    objGraphics.FillPie(new SolidBrush(GetColor(b)),220,110,100,100,0,0);
112                    objGraphics.DrawPie(Pens.Black,220,110,100,100,0,360);
113                }
114            }
115
116            //输出图片
117            objBitMap.Save(Response.OutputStream,ImageFormat.Gif);
118        }
119
120        //颜色设置
121        private Color GetColor(int itemIndex)
122        {
123            Color objColor=new Color();
124            switch(itemIndex)
125            {
126                case 0:
127                    objColor=Color.Blue;
128                    break;
129                case 1:
130                    objColor=Color.Yellow;
131                    break;
132                case 2:
133                    objColor=Color.Red;
134                    break;
135                case 3:
136                    objColor=Color.Orange;
137                    break;
138                case 4:
139                    objColor=Color.Purple;
140                    break;
141                case 5:
142                    objColor=Color.Brown;
143                    break;
144                case 124:
145                    objColor=Color.White;
146                    break;
147                default:
148                    objColor=Color.Blue;
149                    break;
150            }
151            return objColor;
152        }
153
154        Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
155        override protected void OnInit(EventArgs e)
156        {
157            //
158            // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
159            //
160            InitializeComponent();
161            base.OnInit(e);
162        }
163        
164        /**//// <summary>
165        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
166        /// 此方法的内容。
167        /// </summary>
168        private void InitializeComponent()
169        {    
170            this.Load += new System.EventHandler(this.Page_Load);
171
172        }
173        #endregion
174    }
175}
176

【后记】
传给这个页面参数时,
用控件:<asp:Image id="Image1"  runat="server"></asp:Image>不能传递带绑定的参数
如果需要传递带绑定的参数,请使用:<img src="Chart.aspx">

【致谢】
感谢我的同事无私的让我使用了两晚上他的电脑,才有了这篇文章!
斧头帮少帮主     博客园