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 System.IO;
namespace 繪制面形圖
{
  public partial class Form1 : Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    Graphics g;//創(chuàng)建Graphics對象
    private void button1_Click(object sender, EventArgs e)
    {
      Bitmap bt = new Bitmap(panel1.Width, panel1.Height);//實例化一個Bitmap對象
      int flag = (panel1.Width-4 )/ 6;//X軸的增值
      g = Graphics.FromImage(bt);//實例化Graphics對象
      Pen p = new Pen(Color.Black, 1);//設置Pen對象
      g.DrawLine(p, new Point(0, 0), new Point(0, panel1.Height-20));//繪制Y軸
      g.DrawLine(p, new Point(0, panel1.Height - 20), new Point(panel1.Width - 4, panel1.Height - 20));//繪制X軸
      //聲明一個用于繪制顏色的數組
      Color[] cl = new Color[] { Color.Red, Color.Blue, Color.YellowGreen, Color.Yellow, Color.RoyalBlue, Color.Violet, Color .Tomato};
      int[] points = { 20,70,80,60,40,100,10};//聲明一個計算走勢峰值的數組
      Point pt1 = new Point(0, panel1.Height - 20 - points[0]);//記錄繪制四邊形的第一個點
      Point pt2 = new Point(0, panel1.Height - 20);//記錄繪制四邊形的第二個點
      for (int i = 0; i <= 6; i++)//通過for循環(huán)繪制月份和面形圖
      {
        PointF p1 = new PointF(flag * i, panel1.Height - 20);//計算每個月份數字的坐標
        //繪制顯示月份的數字
        g.DrawString(i.ToString(), new Font("宋體", 9), new SolidBrush(Color.Black), new PointF(p1.X - 2, p1.Y));
        //記錄繪制四邊形的第三個點
        Point pt3 = new Point(flag * i, panel1.Height - 20);
        //記錄繪制四邊形的第四個點
        Point pt4 = new Point(flag * i, panel1.Height - 20 - points[i]);
        Point[] pt={pt1,pt2,pt3,pt4};//聲明一個Point數組
        g.FillPolygon(new SolidBrush(cl[i]), pt);//填充四邊形的顏色
        //當繼續(xù)繪制下一個四邊形時，前一個四邊形的最后兩個點作為下一個四邊形的起始點
        pt1 = pt4;
        pt2 = pt3;
      }
      panel1.BackgroundImage = bt;//顯示繪制的面形圖
    }

    private void Form1_Load(object sender, EventArgs e)
    {

    }
  }
}