C#繪制中國象棋棋盤

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

namespace Chinese_chessboard
{
 public partial class FrmMain : Form
 {
  public FrmMain()
  {
   InitializeComponent();
  }

  private void FrmMain_Paint(object sender, PaintEventArgs e)
  {
   if (!File.Exists(Application.StartupPath + @"\" + "bg.jpg"))
   {
    MessageBox.Show("請把素材中的bg.jpg圖片文件放到可執行程序相同文件夾中,並重新啟動程序！", "提示"); Application.Exit();
   }
   Console.WriteLine("C#編程交流群:485532597");
   Graphics g = e.Graphics; // 獲取一個Graphics對象
   g.Clear(Color.Coral);  //用珊瑚色清除窗體
   Font font1 = new Font("黑體", 25, FontStyle.Regular);
   int s = (int)(font1.Size / 0.6);
   int s2 = (int)font1.Height;
   Image img = Image.FromFile("bg.jpg");
   g.DrawImage(Image.FromFile(Application.StartupPath + @"\" + "bg.jpg"), 10, 10, 430, 480);  //繪制背景圖
   g.DrawRectangle(new Pen(Color.Black, 3), new Rectangle(new Point(20, 20), new Size(410, 460))); //繪制框圖

   Pen pen = new Pen(Color.Black, 1);
   //繪制水平線
   for (int i = 0; i < 10; i++)
   {
    g.DrawLine(pen, new Point(25, 25 + (i * 50)), new Point(425, 25 + (i * 50)));
   }


   //繪制垂直線
   for (int i = 0; i < 9; i++)
   {
    g.DrawLine(pen, new Point(25 + (i * 50), 25), new Point(25 + (i * 50), 225));
    g.DrawLine(pen, new Point(25 + (i * 50), 275), new Point(25 + (i * 50), 475));
   }
   //return;
   //繪制將士位置斜線
   g.DrawLine(pen, new Point(175, 25), new Point(275, 125));
   g.DrawLine(pen, new Point(275, 25), new Point(175, 125));
   g.DrawLine(pen, new Point(175, 375), new Point(275, 475));
   g.DrawLine(pen, new Point(175, 475), new Point(275, 375));



   //兵位（炮位）線,隻畫一個
   g.DrawLine(pen, new Point(30, 160), new Point(30, 170));
   g.DrawLine(pen, new Point(30, 170), new Point(40, 170));
   g.DrawLine(pen, new Point(30, 180), new Point(30, 190));
   g.DrawLine(pen, new Point(30, 180), new Point(40, 180));

   g.DrawString("楚 河", new Font("黑體", 25), Brushes.Black, new Point(50, 235));

   g.TranslateTransform(300, 235); //平移坐標軸
   g.RotateTransform(180); //進行180度旋轉
   g.DrawString("漢 界", new Font("黑體", 25), Brushes.Black, new Point(-100, -35));
   g.ResetTransform(); //坐標軸復位 
   
   this.DrawAngle(g, pen, new Point(125, 175), "all");
   this.DrawAngle(g, pen, new Point(425, 175), "left");
   this.DrawAngle(g, pen, new Point(225, 175), "all");
   this.DrawAngle(g, pen, new Point(425, 175), "left");
   this.DrawAngle(g, pen, new Point(325, 175), "all");
   this.DrawAngle(g, pen, new Point(425, 175), "left");
   this.DrawAngle(g, pen, new Point(75, 125), "all");
   this.DrawAngle(g, pen, new Point(375, 125), "all");

   this.DrawAngle(g, pen, new Point(25, 325), "right");
   this.DrawAngle(g, pen, new Point(125, 325), "all");
   this.DrawAngle(g, pen, new Point(225, 325), "all");
   this.DrawAngle(g, pen, new Point(325, 325), "all");
   this.DrawAngle(g, pen, new Point(425, 325), "left");
   this.DrawAngle(g, pen, new Point(75, 375), "all");
   this.DrawAngle(g, pen, new Point(375, 375), "all");
   g.Dispose();   //釋放對象
  }
  private void DrawAngle(Graphics g,Pen pen, Point point,string str)
  {
   Point p1 = new Point(point.X + 5, point.Y + 5);
   Point p2= new Point(point.X - 5, point.Y + 5);
   Point p3= new Point(point.X -5, point.Y - 5);
   Point p4 = new Point(point.X +5, point.Y -5);
   if(str=="right"||str=="all")
   {
    //p1 p4
    g.DrawLine(pen, p1, new Point(p1.X + 10, p1.Y));
    g.DrawLine(pen, p1, new Point(p1.X, p1.Y+10));
    g.DrawLine(pen, p4, new Point(p4.X + 10, p4.Y));
    g.DrawLine(pen, p4, new Point(p4.X, p4.Y-10));
   }
   if(str=="left" || str == "all")
   {
    //p2 p3
    g.DrawLine(pen, p2, new Point(p2.X - 10, p2.Y));
    g.DrawLine(pen, p2, new Point(p2.X, p2.Y+10));
    g.DrawLine(pen, p3, new Point(p3.X - 10, p3.Y));
    g.DrawLine(pen, p3, new Point(p3.X, p3.Y - 10));
   }
  }
 }
}