WinFrom折线图

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace MyEillipse
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            //声明一个string类型的数组用于存储一年中的12个月份
            string[] month = new string[12] {"一月","二月","三月","四月","五月","六月","七月","八月","九月","十月","十一月","十二月"};
            float[] d = new float[12] { 20.5F,60,10.8F,15.6F,30,70.9F,50.3F,30.7F,70,50.4F,30.8F,20};
            //画图初始化
            Bitmap bMap = new Bitmap(500,500);
            Graphics gph = Graphics.FromImage(bMap);
            gph.Clear(Color.White);

            PointF cPt = new PointF(40, 420);//中心点
            //X轴三角形
            PointF[] xPt = new PointF[3] { new PointF(cPt.Y + 15, cPt.Y), new PointF(cPt.Y, cPt.Y-8), new PointF(cPt.Y, cPt.Y+8) };
            //Y轴三角形
            PointF[] yPt = new PointF[3] { new PointF(cPt.X, cPt.X - 15), new PointF(cPt.X - 8, cPt.X), new PointF(cPt.X + 8, cPt.X) };
            gph.DrawString("某工厂某产品月生产量图表",new Font("宋体",14),Brushes.Black,new PointF(cPt.X+60,cPt.X));

            //X轴
            gph.DrawLine(Pens.Black, cPt.X, cPt.Y, cPt.Y, cPt.Y);
            gph.DrawPolygon(Pens.Black, xPt);
            gph.FillPolygon(new SolidBrush(Color.Black), xPt);
            gph.DrawString("月份", new Font("宋体", 12), Brushes.Black, new PointF(cPt.Y + 10, cPt.Y + 10));

            //Y轴
            gph.DrawLine(Pens.Black, cPt.X, cPt.Y, cPt.X, cPt.X);
            gph.DrawPolygon(Pens.Black, yPt);
            gph.FillPolygon(new SolidBrush(Color.Black), yPt);
            gph.DrawString("单位(万)", new Font("宋体", 12), Brushes.Black, new PointF(0,7));

            for (int i = 1; i <=12; i++)
            {
                //画Y轴刻度
                if (i < 11)
                {
                    gph.DrawString((i * 10).ToString(), new Font("宋体", 11), Brushes.Black, new PointF(cPt.X - 30, cPt.Y - i * 30 - 6));
                    gph.DrawLine(Pens.Black, cPt.X - 3, cPt.Y - i * 30, cPt.X, cPt.Y - i * 30);
                }
                //画X轴
                gph.DrawString(month[i - 1].Substring(0, 1), new Font("宋体", 11), Brushes.Black, new PointF(cPt.X + i * 30 - 5, cPt.Y + 5));
                gph.DrawString(month[i - 1].Substring(1, 1), new Font("宋体", 11), Brushes.Black, new PointF(cPt.X + i * 30 - 5, cPt.Y + 20));

                if (month[i - 1].Length>2)
                    gph.DrawString(month[i-1].Substring(2,1),new Font("宋体",11),Brushes.Black,new PointF(cPt.X+i*30-5,cPt.Y+35));
                //画点
                gph.DrawEllipse(Pens.Black,cPt.X+i*30-1.5F,cPt.Y-d[i-1]*3-1.5F,3,3);
                gph.FillEllipse(new SolidBrush(Color.Black),cPt.X+i*30-1.5F,cPt.Y-d[i-1]*3-1.5F,3,3);
                //画数值
                gph.DrawString(d[i - 1].ToString(), new Font("宋体", 11), Brushes.Black, new PointF(cPt.X + i * 30, cPt.Y - d[i - 1] * 3));
                //画折线
                
                if(i>1) gph.DrawLine(Pens.Red,cPt.X+(i-1)*30,cPt.Y-d[i-2]*3,cPt.X+i*30,cPt.Y-d[i-1]*3);
            }
            pictureBox1.Image = bMap;
        }
    }
}