Draw a Pie Chart in C#

Ghanashyam Nayak
Oct 04, 2012
105.2k
0
0
Article

In this article we will see how we can draw a pie chart of our given value.

I provided a description as a comment for each line of code below which will help you to draw a pie chart.

Main Code :

using System;

using System.Collections.Generic;

using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Microsoft.VisualBasic;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;

namespace WindowsFormsApplication1
{
    public partial class Form2 : Form
    {
        Form frm1=new Form1();
        public Form2()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
  {
     //Call Main Function Which Will Help To Draw a Pie Chartâ€¦
           DrawPieChartOnForm();
  }

  public void DrawPieChartOnForm()
  {
     //Take Total Five Values & Draw Chart Of These Values.
           int[] myPiePercent = { 10, 20, 25, 5, 40 };

           //Take Colors To Display Pie In That Colors Of Taken Five Values.
           Color[] myPieColors = {Color.Red,Color.Black,Color.Blue,Color.Green,Color.Maroon};

           using (Graphics myPieGraphic = this.CreateGraphics())
           {
                //Give Location Which Will Display Chart At That Location.
                Point myPieLocation = new Point(10, 10);

                //Set Here Size Of The Chartâ€¦
                Size myPieSize = new Size(150, 150);

                //Call Function Which Will Draw Pie of Values.
                DrawPieChart(myPiePercent, myPieColors, myPieGraphic, myPieLocation, myPieSize);
           }
  }

  // Draws a pie chart.
  public void DrawPieChart(int[] myPiePerecents, Color[] myPieColors, Graphics myPieGraphic, Point
myPieLocation, Size myPieSize)
  {
           //Check if sections add up to 100.
           int sum = 0;
           foreach (int percent_loopVariable in myPiePerecents)
           {
                sum += percent_loopVariable;
           }

           if (sum != 100)
           {
                MessageBox.Show("Sum Do Not Add Up To 100.");
           }

           //Check Here Number Of Values & Colors Are Same Or Not.They Must Be Same.
           if (myPiePerecents.Length != myPieColors.Length)
           {
                MessageBox.Show("There Must Be The Same Number Of Percents And Colors.");
           }

           int PiePercentTotal = 0;
           for (int PiePercents = 0; PiePercents<myPiePerecents.Length; PiePercents++)
           {
                using (SolidBrush brush = new SolidBrush(myPieColors[PiePercents]))
                {

                   //Here it Will Convert Each Value Into 360, So Total Into 360 & Then It Will Draw A Full Pie Chart.
                           myPieGraphic.FillPie(brush, new Rectangle(new Point(10,10), myPieSize), Convert.ToSingle(PiePercentTotal * 360 / 100), Convert.ToSingle(myPiePerecents[PiePercents] * 360 / 100));
                }

                PiePercentTotal += myPiePerecents[PiePercents];
           }
           return;
}
    }
}