C# 餅圖實現(手工畫的)

2019-11-17 03:52:55

字體：大中小

來源：轉載

供稿：網友

C# 餅圖,其實很簡單的一個東西,我發上來是因為我要實現的一個功能,網絡上面的什么控件什么的都不可以做到,

在網上搜了將近一天的時間,我暈暈的，但是結果確實失落的，一氣之下,自己畫了一個,也就花了三個小時,希望能夠

給需要的朋友帶來幫助,少走一點彎路,知識在于共享,大家共同進步,好了,不廢話了，代碼如下,什么都不需要安裝，

直接用就可以了，C#.Net 2005環境,XP操作系統，需要連數據庫動態顯示的朋友，只要改變傳進去的DataTable就可以了

上面沒有什么備注,我認為很簡單的東西，所以也就忽略了，我相信大家只要用心看，應該很簡單

首先創建一個aspx文件,張貼以下代碼就可以了，注意紅色部分改成你自己的檔名就可以了

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;

public partial class Test_Chart : System.Web.UI.Page
{
    PRotected void Page_Load(object sender, EventArgs e)
    {
        // 在此處放置用戶代碼以初始化頁面
        MemoryStream stream = new MemoryStream();
        MemoryStream columnarStream = new MemoryStream();
        Bitmap graph = null;
        DataTable dt = new DataTable();
        dt.Columns.Add("Ven", typeof(System.String));
        dt.Columns.Add("BadQty", typeof(System.Int32));
        dt.Rows.Add("山東威海", 65);
        dt.Rows.Add("安徽黃山",23);
        dt.Rows.Add("江蘇太湖",34);
        dt.Rows.Add("陜西華山",98);
        dt.Rows.Add("湖南景剛山",102);
        dt.Rows.Add("海南南海",74);
        graph = GetPieGraph("Compex各組別不合格率統計",600,500,100,30,dt);
        graph.Save(stream, ImageFormat.Jpeg);
        //圖片輸出
        Response.Clear();
        Response.ContentType = "image/jpeg";
        Response.BinaryWrite(stream.ToArray());
    }

    protected Bitmap GetPieGraph(string title, int width, int height, int left, int top, DataTable gdt)
    {
        Bitmap objbitmap = new Bitmap(width, height);
        Graphics objgraphics;
        objgraphics = Graphics.FromImage(objbitmap);
        objgraphics.Clear(Color.White);
        StringFormat drawformat = new System.Drawing.StringFormat(StringFormatFlags.DirectionVertical);
        StringFormat drawformat1 = new System.Drawing.StringFormat(StringFormatFlags.DisplayFormatControl);
        objgraphics.DrawString(title, new Font("宋體", 16),Brushes.Black, 150, 5, drawformat1);
        PointF symbolleg = new PointF(left, height-top-45);
        PointF descleg = new PointF(left + 20, height - top - 45);
        //畫邊框
        objgraphics.DrawRectangle(Pens.Black, 0, 0, width-1, height-1);
        //畫內小框
        int h = gdt.Rows.Count / 4;
        if (gdt.Rows.Count % 4 > 0)
        {
            h = h + 1;
        }
        objgraphics.DrawRectangle(Pens.Black, left-10, height-top-50,gdt.Rows.Count*70+10,20*h);
        //顯示什么顏色代表什么的
        for (int i = 0; i < gdt.Rows.Count; i++)
        {
            if (i >= 4 && (i+1)%4==1)
            {
                symbolleg.Y += 20;
                descleg.Y += 20;
                symbolleg.X = left;
                descleg.X = left + 20;
            }

            objgraphics.FillRectangle(new SolidBrush(getcolor(i)), symbolleg.X, symbolleg.Y, 12, 10);
            objgraphics.DrawRectangle(Pens.Black, symbolleg.X, symbolleg.Y, 12, 10);
            objgraphics.DrawString(gdt.Rows[i][0].ToString().Trim(), new Font("宋體", 10), Brushes.Black, descleg);
            symbolleg.X += 100;
            descleg.X += 100;
        }

        float sglcurrentangle = 0;
        float sgltotalangle = 0;
        float sgltotalvalues = 0;
        for (int i = 0; i < gdt.Rows.Count; i++)
        {
            sgltotalvalues += float.Parse(gdt.Rows[i][1].ToString().Trim());
        }
        for (int i = 0; i < gdt.Rows.Count; i++)
        {
            sglcurrentangle = float.Parse(gdt.Rows[i][1].ToString().Trim()) / sgltotalvalues * 360;
            objgraphics.FillPie(new SolidBrush(getcolor(i)), left+50, top+30, 300, 300, sgltotalangle, sglcurrentangle);
            objgraphics.DrawPie(Pens.Black, left + 50, top + 30,300, 300, sgltotalangle, sglcurrentangle);
            //半徑 r
            double r = 300 / 2;
            //圓心位置：
            double cX = left + 50 + r;
            double cY = top + 30 + r;
            //圓上點的坐標：
            double dX = r * Math.Cos((360 - sgltotalangle - sglcurrentangle / 2) * 3.14 / 180);
            double dY = r * Math.Sin((360 - sgltotalangle - sglcurrentangle / 2) * 3.14 / 180);
            //圓上位置:
            double dcX = cX + dX;
            double dcY = cY - dY;

            //半徑 r
            double r1 = 350 / 2;
            //圓心位置：
            double cX1 = left + 50 + r;
            double cY1 = top + 30 + r;
            //圓上點的坐標：
            double dX1 = r1 * Math.Cos((360 - sgltotalangle - sglcurrentangle / 2) * 3.14 / 180);
            double dY1 = r1 * Math.Sin((360 - sgltotalangle - sglcurrentangle / 2) * 3.14 / 180);
            //圓上位置:
            double dcX1 = cX1 + dX1;
            double dcY1 = cY1 - dY1;


            objgraphics.DrawLine(Pens.Black,Convert.ToInt32(dcX) ,Convert.ToInt32(dcY),Convert.ToInt32(dcX1), Convert.ToInt32(dcY1));
            if (dX1 >= 0 && dY1 >= 0)
            {
                objgraphics.DrawString(gdt.Rows[i][0].ToString().Trim(), new Font("宋體", 10), Brushes.Black, Convert.ToInt32(dcX1), Convert.ToInt32(dcY1 - 5));
            }
            if (dX1 <= 0 && dY1 >= 0)
            {
                objgraphics.DrawString(gdt.Rows[i][0].ToString().Trim(), new Font("宋體", 10), Brushes.Black, Convert.ToInt32(dcX1 - 25), Convert.ToInt32(dcY1 - 15));
            }
            if (dX1 <= 0 && dY1 <= 0)
            {
                objgraphics.DrawString(gdt.Rows[i][0].ToString().Trim(), new Font("宋體", 10), Brushes.Black, Convert.ToInt32(dcX1 - 30), Convert.ToInt32(dcY1));
            }
            if (dX1 >= 0 && dY1 <= 0)
            {
                objgraphics.DrawString(gdt.Rows[i][0].ToString().Trim(), new Font("宋體", 10), Brushes.Black, Convert.ToInt32(dcX1), Convert.ToInt32(dcY1));
            }

            //GetLet(left + 50+150, top + 30+150,300,sgltotalangle, sglcurrentangle,arrvalues[i].ToString());
            sgltotalangle += sglcurrentangle;
        }
        return objbitmap;
    }

    protected void GetLet(int startX, int startY, double dia, double totalAngle, double currentAngle, string leg)
    {
        double x = 0;
        double y = 0;
        double r = dia / 2;
        x = r * Math.Cos((360 - totalAngle - currentAngle / 2) * 3.14 / 180);
        y = r * Math.Sin((360 - totalAngle - currentAngle / 2) * 3.14 / 180);
    }

    protected Color getcolor(int itemindex)
    {
        Color objcolor;
        if (itemindex >= 14)
        {
            itemindex = itemindex % 14;
        }
        if (itemindex == 0)
        {
            objcolor = Color.DarkMagenta;
        }
        else if (itemindex == 1)
        {
            objcolor = Color.MediumAquamarine;
        }
        else if (itemindex == 2)
        {
            objcolor = Color.DeepSkyBlue;
        }
        else if (itemindex == 3)
        {
            objcolor = Color.DarkRed;
        }
        else if (itemindex == 4)
        {
            objcolor = Color.Pink;
        }
        else if (itemindex == 5)
        {
            objcolor = Color.Salmon;
        }
        else if (itemindex == 6)
        {
            objcolor = Color.Khaki;
        }
        else if (itemindex == 7)
        {
            objcolor = Color.Maroon;
        }
        else if (itemindex == 8)
        {
            objcolor = Color.LawnGreen;
        }
        else if (itemindex == 9)
        {
            objcolor = Color.LightGoldenrodYellow;
        }
        else if (itemindex == 10)
        {
            objcolor = Color.Moccasin;
        }
        else if (itemindex == 11)
        {
            objcolor = Color.YellowGreen;
        }
        else if (itemindex == 12)
        {
            objcolor = Color.DarkCyan;
        }
        else if (itemindex == 13)
        {
            objcolor = Color.SteelBlue;
        }
        else if (itemindex == 14)
        {
            objcolor = Color.Tomato;
        }
        else
        {
            objcolor = Color.SlateGray;
        }
        return objcolor;
    }

}

效果圖發不上來,下次有空再補充

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