From f57a13fce80faa98a06146995373acb2c39c3dcc Mon Sep 17 00:00:00 2001
From: yeziuku <53083103+yeziuku@users.noreply.github.com>
Date: Tue, 21 Nov 2023 19:54:36 +0800
Subject: [PATCH] ChessBoardExample (#2)

* Create ChessBoardExample

* Rename ChessBoardExample to ChessBoardExample.cs
---
 Solutions/ChessBoardExample.cs | 158 +++++++++++++++++++++++++++++++++
 1 file changed, 158 insertions(+)
 create mode 100644 Solutions/ChessBoardExample.cs

diff --git a/Solutions/ChessBoardExample.cs b/Solutions/ChessBoardExample.cs
new file mode 100644
index 0000000..1d612c6
--- /dev/null
+++ b/Solutions/ChessBoardExample.cs
@@ -0,0 +1,158 @@
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Windows.Forms;
+
+namespace ChessBoardExample
+{
+    public partial class Form2 : Form
+    {
+        const int gridSize = 12; // 每个小方块大小为40像素
+        const int step = 3; // 递进
+
+        Dictionary<string, Panel> chessboardDict = new Dictionary<string, Panel>();
+        HashSet<Panel> redPanelsSet = new HashSet<Panel>();
+
+        public Form2()
+        {
+            InitializeComponent();
+            InitializeChessboard();
+
+            foreach (var panel in chessboardDict.Values)
+            {
+                panel.MouseEnter += OnCellMouseEnter;
+                panel.MouseLeave += OnCellMouseLeave;
+            }
+
+            string key = "5_9";
+            Button b = new Button();
+            b.Size = new Size(gridSize, gridSize);
+            b.Text = "";
+            chessboardDict[key].Controls.Add(b);
+            b.Click += new EventHandler((sender, args) =>
+            {
+                if (redPanelsSet.Count > 0) SetOriginalCells();
+                else CheckRedCells(5, 9);
+            });
+        }
+
+        private void InitializeChessboard()
+        {
+            for (int i = 0; i < 16; i++)
+                for (int j = 0; j < 16; j++)
+                    AddNewGrid(i, j);
+        }
+
+        private void AddNewGrid(int x, int y)
+        {
+            string key = x.ToString() + "_" + y.ToString();
+            var p = new Point(x * gridSize, y * gridSize);
+
+            Panel cell = new Panel()
+            {
+                Name = key,
+                Size = new Size(gridSize, gridSize),
+                Location = p
+            };
+            if ((x + y) % 2 == 0)
+                cell.BackColor = Color.White;
+            else
+                cell.BackColor = Color.LightGray;
+
+            Controls.Add(cell);
+
+            chessboardDict[key] = cell;
+        }
+
+        private void CheckRedCells(int x, int y)
+        {
+            try
+            {
+                SetOriginalCells();
+                HashSet<string> keysToSet = new HashSet<string>();
+
+                for (int dx = -step; dx <= step; ++dx)
+                {
+                    for (int dy = -step; dy <= step; ++dy)
+                    {
+                        if (Math.Abs(dx) + Math.Abs(dy) <= step)
+                        {//限制在中心点周围范围内
+                            if (x + dx >= -15 && x + dx < 16 && y + dy >= -15 && y + dy < 16)
+                            {//检查是否在棋盘范围内
+                                string key = (x + dx) + "_" + (y + dy);
+                                if (chessboardDict.ContainsKey(key))
+                                    keysToSet.Add(key);//将符合条件的坐标添加到集合中
+                            }
+                        }
+                    }
+                }
+                this.SetRedCells(keysToSet); // 调用设置红色背景方法，传递新计算出来的键集合
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show(ex.ToString());
+            }
+        }
+
+        private void SetRedCells(HashSet<string> keysToSet)
+        {
+            foreach (var k in keysToSet)
+            {
+                var coords = k.Split('_');
+                int x = int.Parse(coords[0]);
+                int y = int.Parse(coords[1]);
+
+                var npn = chessboardDict[x + "_" + y];
+                npn.BackColor = Color.FromArgb(128, Color.Red);//设置红色面板
+
+                redPanelsSet.Add(npn);
+            }
+        }
+
+        private void SetOriginalCells()
+        {
+            try
+            {
+                foreach (var panel in redPanelsSet)
+                {
+                    string[] coords = panel.Name.Split('_');
+                    int x = int.Parse(coords[0]);
+                    int y = int.Parse(coords[1]);
+
+                    if ((x + y) % 2 == 0)
+                        panel.BackColor = Color.White;
+                    else
+                        panel.BackColor = Color.LightGray; // 恢复为原来的背景颜色
+                }
+
+                redPanelsSet.Clear(); // 清空红色面板集合
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show(ex.ToString());
+            }
+        }
+
+        private void OnCellMouseEnter(object sender, System.EventArgs e)
+        {
+            try
+            {
+                // 获取当前鼠标进入区域对应格子位置；
+                string[] s = ((Panel)sender).Name.Split('_');
+                int x = int.Parse(s[0]);
+                int y = int.Parse(s[1]);
+
+                CheckRedCells(x, y);
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show(ex.ToString());
+            }
+        }
+
+        private void OnCellMouseLeave(object sender, EventArgs e)
+        {
+            SetOriginalCells();
+        }
+    }
+}