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annotate react_games/src/Connectfour/latest.tsx @ 71:75de5903355c

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Giagantic changes that update Dowa library to be more align with stb style array and hashmap. Updated Seobeo to be caching on server side instead of file level caching. Deleted bunch of things I don't really use.
author June Park <parkjune1995@gmail.com>
date Sun, 28 Dec 2025 20:34:22 -0800
parents 5e6a5d3c6868
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 import { CSSProperties, memo, useCallback, useReducer } from "react";
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2
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3 /**
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4 * Connect4 game is also known as Four Up, Plot Four, Find Four, Captain’s Mistress, Four in a Row, Drop Four, and Gravitrips in the Soviet Union.
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5 * It is a two-player connection board game, in which the players choose a color and then take turns dropping colored discs into a seven-column, six-row vertically suspended grid.
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6 * There could be human and bot players.
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7 * The pieces fall straight down, occupying the lowest available space within the column.
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8 * The objective of the game is to be the first to form a horizontal, vertical, or diagonal line of four of one’s own discs. Connect Four is a solved game.
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9 * The first player can always win by playing the right moves.
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10 *
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11 */
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12
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13 interface Cell {
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14 value: CellValue;
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15 isHighlighted: boolean;
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16 }
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17
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18 type CellValue = Player | "";
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19
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20 type Board = Cell[][];
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21
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22 enum Player {
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23 RED="🔴",
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24 BLUE="🔵",
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25 }
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26
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27 enum GameStatus {
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28 PLAYABLE = "Your Turn!",
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29 RED_WON = "RED WON!",
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30 BLUE_WON = "BLUE WON!",
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31 }
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32
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33 interface GameState {
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34 board: Board;
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35 player: Player;
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36 status: GameStatus;
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37 }
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38
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39 const MAX_ROW = 6;
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40 const MAX_COL = 7;
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41
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42 const constructGameState = (): GameState => {
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43 return {
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44 board: Array.from(
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45 { length: MAX_ROW }, () =>
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46 Array.from({ length: MAX_COL }, (): Cell => ({ value: "", isHighlighted: false }) )),
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47 player: Player.RED,
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48 status: GameStatus.PLAYABLE
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49 }
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50 }
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51
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52 interface CellComponentProp {
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53 cell: Cell;
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54 placeDispatch: (col: number) => void;
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55 col: number;
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56 }
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57
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58 interface StylesProp {
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59 board: CSSProperties;
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60 cell: (isHighlighted: boolean) => CSSProperties;
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61 circle: CSSProperties;
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62 }
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63
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64 const styles: StylesProp = {
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65 board: {
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66 display: "grid",
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67 gridTemplateColumns: `repeat(${MAX_COL}, 1fr)`,
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68 width: 600,
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69 },
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70 cell: (isHighlighted: boolean) => ({
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71 width: "100%",
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72 display: "flex",
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73 justifyContent: "center",
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74 alignItems: "center",
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75 aspectRatio: "1 / 1",
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76 border: "1px solid black",
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77 backgroundColor: isHighlighted ? "blue": "lightblue",
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78 }),
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79 circle: {
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80 width: "60%",
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81 borderRadius: 50,
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82 backgroundColor: "aqua",
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83 aspectRatio: "1 / 1",
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84 display: "flex",
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85 justifyContent: "center",
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86 alignItems: "center",
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87 }
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88 }
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89
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90 type Action =
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91 | { type: "place", col: number }
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92 | { type: "reset" };
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93
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94
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95 const DIRECTION = [
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96 [0, 1],
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97 [1, 0],
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98 [1, 1],
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99 [1, -1],
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100 ]
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101 const calculateGameStatus = (board: Board): { status: GameStatus, winningIndex: number[][] } => {
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102 for (let rowIdx = 0; rowIdx < MAX_ROW; rowIdx++) {
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103 for (let colIdx = 0; colIdx < MAX_COL; colIdx++) {
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104 if (board[rowIdx][colIdx].value === "") continue;
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105
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106 for (const [dr, dc] of DIRECTION) {
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107 if (
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108 board[rowIdx][colIdx].value === board[rowIdx+dr]?.[colIdx+dc]?.value &&
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109 board[rowIdx][colIdx].value === board[rowIdx+(dr*2)]?.[colIdx+(dc*2)]?.value &&
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110 board[rowIdx][colIdx].value === board[rowIdx+(dr*3)]?.[colIdx+(dc*3)]?.value
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111 ) {
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112 return {
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113 status: board[rowIdx][colIdx].value === Player.RED ? GameStatus.RED_WON : GameStatus.BLUE_WON,
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114 winningIndex: [
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115 [rowIdx,colIdx],
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116 [rowIdx+dr,colIdx+dc],
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117 [rowIdx+(dr*2),colIdx+(dc*2)],
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118 [rowIdx+(dr*3),colIdx+(dc*3)],
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119 ]
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120 }
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121 }
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122 }
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123 }
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124 }
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125
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126 return {
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127 status: GameStatus.PLAYABLE,
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128 winningIndex: []
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129 }
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130 }
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131
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132 const gameStateReducer = (state: GameState, action: Action): GameState => {
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133 if (state.status !== GameStatus.PLAYABLE) return state;
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134
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135 switch(action.type) {
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136 case "place": {
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137 let selectedRow: number = -1
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138 for (let rowIdx = MAX_ROW - 1; rowIdx >= 0; rowIdx--) {
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139 if (state.board[rowIdx][action.col].value === "") {
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140 selectedRow = rowIdx;
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141 break;
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142 }
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143 }
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144 if (selectedRow === -1) return state;
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145 let board = state.board.map(
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146 (row, rowIdx) => rowIdx === selectedRow ?
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147 row.map((col, colIdx) =>
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148 colIdx === action.col ? { ...col, value: state.player } : col) : row
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149 );
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150 const player = Player.RED === state.player ? Player.BLUE : Player.RED;
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151 const {status, winningIndex} = calculateGameStatus(board);
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152 if (winningIndex.length > 0) {
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153 board = board.map(
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154 (row, rowIdx) =>
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155 row.map((col, colIdx): Cell =>
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156 winningIndex.some(
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157 ([r, c]) => (rowIdx === r && colIdx === c)) ?
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158 { ...col, isHighlighted: true } : col
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159 )
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160 );
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161 }
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162 return {
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163 board,
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164 player,
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165 status,
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166 };
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167 }
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168 case "reset":
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169 return constructGameState();
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170 }
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171 }
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172
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173 const CellComponent = memo(({cell, col, placeDispatch}: CellComponentProp) => {
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174 const handleOnClick = useCallback(() => {
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175 placeDispatch(col);
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176 },[col, placeDispatch]);
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177
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178 return (
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179 <div style={styles.cell(cell.isHighlighted)} onClick={handleOnClick}>
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180 <div style={styles.circle}>
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181 {cell.value}
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182 </div>
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183 </div>
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184 )
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185 })
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186
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187 const ConnectFour = () => {
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188 const [state, dispatch] = useReducer(gameStateReducer, null, constructGameState);
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189
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190 const placeDispatch = useCallback(
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191 (col: number) => {
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192 dispatch({type: "place", col})
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193 }, [dispatch]);
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194
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195 return (
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196 <>
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197 <h1> {state.status} </h1>
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198 {state.status === GameStatus.PLAYABLE &&(<h2> {state.player} </h2>)}
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199 <div style={styles.board}>
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200 {state.board.map(
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201 (row, rowIdx) => row.map(
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202 (cell, colIdx) => (
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203 <CellComponent
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204 key={`${rowIdx}-${colIdx}`}
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205 cell={cell}
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206 col={colIdx}
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207 placeDispatch={placeDispatch}/>
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208 )
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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209 )
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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210 )}
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211 </div>
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MrJuneJune <me@mrjunejune.com>
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212 </>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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213 )
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214 }
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215
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216 export {
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parents:
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217 ConnectFour
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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parents:
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218 }