{"id":3890,"date":"2014-04-28T07:47:02","date_gmt":"2014-04-27T22:47:02","guid":{"rendered":"http:\/\/www.a21-hp.com\/wp\/?p=3890"},"modified":"2022-09-29T23:11:29","modified_gmt":"2022-09-29T14:11:29","slug":"%e3%82%b9%e3%83%8d%e3%83%bc%e3%82%af%e3%82%b2%e3%83%bc%e3%83%a0","status":"publish","type":"post","link":"https:\/\/www.a21-hp.com\/wp\/%e3%82%b9%e3%83%8d%e3%83%bc%e3%82%af%e3%82%b2%e3%83%bc%e3%83%a0\/","title":{"rendered":"\u30b9\u30cd\u30fc\u30af\u30b2\u30fc\u30e0"},"content":{"rendered":"\n

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\"20140428a\"<\/a><\/figure>\n<\/div>\n\n\n

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\u8a66\u3057\u306b\u3001snake.js\uff08120\u884c\u76ee\uff09\u306e\u3001e.preventDefault(); \u3092 e.defaultPrevented; \u306b\u5909\u66f4\u3057\u3066\u307f\u305f\u3082\u306e\u306e\u3001\u8b66\u544a\u304c\u6d88\u3048\u3066\u304f\u308c\u306a\u3044\u3088\u3046\u3067\u3001\u3069\u3046\u3059\u3079\u304d\u304b\u89e3\u3089\u306a\u304b\u3063\u305f\u306e\u3067\u3001\u5143\u306b\u623b\u3057\u3066\u304a\u304d\u307e\u3057\u305f\u3002<\/p>\n\n\n

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\"20140428b\"<\/a><\/figure>\n<\/div>\n\n\n

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<!DOCTYPE html>\n<html>\n<head>\n\t<meta charset="UTF-8">\n\t<title>Snake Game<\/title>\n\t<script src="snake.js" type="text\/javascript" ><\/script>\n\t<style>\n\t\tbody {\n\t\t\ttext-align:center;\n\t\t\tbackground-color:green;\n\t\t\tcolor:white;\n\t\t}\n\t\tbutton {\n\t\t\twidth:400px;\n\t\t\theight:32px;\n\t\t}\n\t<\/style>\n<\/head>\n<body>\n\t<h1 id="info">Snake Game<\/h1>\n\t<!-- \u30b2\u30fc\u30e0\u753b\u9762\u7528 -->\n\t<div id="game" data-role="page">\n\t\t<canvas id="aCanvas" width="400" height="400"><\/canvas><br>\n\t\t<button id="rButton">\u65b9\u5411\u8ee2\u63db<\/button>\t\n\t<\/div>\n\t<!-- \u30bf\u30a4\u30c8\u30eb\u753b\u9762 -->\n\t<div id="title" data-role="page">\n\t\t<img src="title.png" alt="title"><br>\n\t\t<button id="startButton">START<\/button>\n\t<\/div>\n<\/body>\n<\/html><\/code><\/pre><\/div>\n\n\n\n
\/\/ snake.js\n\/\/ \u5b9a\u6570\u306e\u5ba3\u8a00\uff08\u5927\u6587\u5b57\u306e\u5909\u6570\u3092\u5b9a\u6570\u3068\u3057\u3066\u6271\u3046\uff09\nvar COLS = 20;\t\/\/ \u753b\u9762\u306e\u5217\u6570\nvar ROWS = 20;\t\/\/\t\u753b\u9762\u306e\u884c\u6570\nvar TILE_W = 400 \/ COLS;\nvar TILE_H = 400 \/ ROWS;\nvar DEFAULT_WAIT_TIME = 300;\t\/\/ \u30d8\u30d3\u306e\u52d5\u4f5c\u9593\u9694\n\/\/ \u79fb\u52d5\u65b9\u5411\u3092\u8868\u3059\u30c6\u30fc\u30d6\u30eb\nvar DIR_TBL = [[0,-1],[1,0],[0,1],[-1,0]];\n\/\/ \u5909\u6570\u306e\u5ba3\u8a00\nvar aCanvas;\t\t\/\/ \u30ad\u30e3\u30f3\u30d0\u30b9\nvar ctx;\t\t\t\/\/ \u63cf\u753b\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\nvar dir = 0;\t\t\/\/ \u30d8\u30d3\u306e\u9032\u884c\u65b9\u5411\nvar waitTime = DEFAULT_WAIT_TIME;\nvar sx,sy;\t\t\t\/\/ \u30d8\u30d3\u306e\u982d\u306e\u4f4d\u7f6e\nvar snakeArray = [];\t\/\/ \u30d8\u30d3\u306e\u982d\u306e\u8ecc\u8de1\uff08\u3057\u3063\u307d\uff09\nvar snakeLen;\nvar ax,ay;\t\t\t\/\/ \u30ea\u30f3\u30b4\u306e\u4f4d\u7f6e\nvar needRotate = false;\t\/\/ \u30d8\u30d3\u56de\u8ee2\u8981\u6c42\nvar level = 1;\n\/\/ \u521d\u671f\u5316\u51e6\u7406\nwindow.onload = function () {\n\t\/\/ \u63cf\u753b\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306e\u53d6\u5f97\n\taCanvas = $("aCanvas");\n\tctx = aCanvas.getContext("2d");\n\t\/\/ \u30ad\u30fc\u30dc\u30fc\u30c9\u30a4\u30d9\u30f3\u30c8\u306e\u8a2d\u5b9a\n\twindow.onkeydown = keyHandler;\n\t\/\/ \u65b9\u5411\u8ee2\u63db\u30dc\u30bf\u30f3\u306e\u8a2d\u5b9a\n\t$("rButton").onclick = rButtonHandler;\n\tinitGame();\n};\n\/\/ \u30b2\u30fc\u30e0\u306e\u521d\u671f\u8a2d\u5b9a\u3092\u884c\u3046\nfunction initGame() {\n\t\/\/ \u30b2\u30fc\u30e0\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u521d\u671f\u5316\n\twaitTime = DEFAULT_WAIT_TIME;\n\tlevel = 1;\n\tsnakeLen = 4;\n\t\/\/ \u30bf\u30a4\u30c8\u30eb\u753b\u9762\u3092\u8868\u793a\n\tshowPage('title');\n\t$("info").innerHTML = "Snake Game";\n\t$("startButton").onclick = function () {\n\t\tshowPage('game');\n\t\tnextGame();\n\t};\n}\nfunction nextGame() {\n\t\/\/ \u30d8\u30d3\u306e\u521d\u671f\u4f4d\u7f6e\u3068\u9032\u884c\u65b9\u5411\u3092\u6c7a\u5b9a\n\tsx = rnd(COLS-2);\n\tsy = rnd(ROWS-2)+1;\n\tdir = (sx > (COLS\/2)) ? 3 : 1;\n\tsnakeArray = [[sx, sy]];\n\t\/\/ \u30ea\u30f3\u30b4\u306e\u4f4d\u7f6e\u3092\u6c7a\u5b9a\n\tax = rnd(COLS);\n\tay = rnd(ROWS);\n\t\/\/ \u73fe\u5728\u306e\u30ec\u30d9\u30eb\u3092\u8868\u793a\n\t$("info").innerHTML = "Snake Game level." + level;\n\tdrawScreen();\n\tsetTimeout(gameLoop, 100);\n}\nfunction gameLoop() {\n\t\/\/ \u30e6\u30fc\u30b6\u304b\u3089\u306e\u5165\u529b\u304c\u3042\u3063\u305f\u304b\uff1f\n\tif (needRotate) {\n\t\tneedRotate = false;\n\t\tdir = (dir + 1) % 4;\n\t\tconsole.log("dir=" + dir);\n\t}\n\t\/\/ \u30d8\u30d3\u306e\u982d\u306e\u79fb\u52d5\n\tvar x = sx + DIR_TBL[dir][0];\n\tvar y = sy + DIR_TBL[dir][1];\n\tif (0 <= x && x < COLS && 0 <= y && y < ROWS) {\n\t\tsx = x; sy = y;\n\t\tsnakeArray.unshift([x,y]);\n\t\tsnakeArray = snakeArray.slice(0,snakeLen);\n\t}else{\n\t\talert("Game Over");\n\t\tinitGame();\n\t\treturn;\n\t}\n\tdrawScreen();\n\t\/\/ \u30ec\u30d9\u30eb\u30af\u30ea\u30a2\uff1f\n\tif (sx == ax && sy == ay) {\n\t\talert("Level Clear!");\n\t\tlevel++;\t\t\t\t\/\/ \u30ec\u30d9\u30eb\u3092\u4e0a\u3052\u308b\n\t\tsnakeLen += 2;\t\t\/\/ \u3057\u3063\u307d\u3092\u9577\u304f\u3059\u308b\n\t\twaitTime *= 0.8;\t\/\/ \u79fb\u52d5\u3092\u65e9\u304f\u3059\u308b\n\t\tnextGame();\n\t\treturn;\n\t}\n\tsetTimeout(gameLoop, waitTime);\n}\nfunction drawScreen() {\n\t\/\/ \u80cc\u666f\u306e\u63cf\u753b\n\tctx.clearRect(0,0,400,400);\n\tctx.fillStyle="white";\n\tctx.fillRect(0,0,400,400);\n\t\/\/ \u30d8\u30d3\u306e\u63cf\u753b\n\tctx.fillStyle = "green";\n\tfor (var i in snakeArray) {\n\t\tvar x = snakeArray[i][0];\n\t\tvar y = snakeArray[i][1];\n\t\tctx.fillRect(x * TILE_W, y * TILE_H, TILE_W, TILE_H);\n\t}\n\t\/\/ \u30ea\u30f3\u30b4\u306e\u63cf\u753b\n\tctx.fillStyle = "red";\n\tvar w2 = TILE_W \/ 2;\n\tfillCircle(ax * TILE_W + w2, ay * TILE_W + w2, w2);\n}\nfunction fillCircle(x, y, r) {\n\tctx.beginPath();\n\tvar w2 = TILE_W \/ 2;\n\tctx.arc(x, y, r, 0, Math.PI*2, false);\n\tctx.fill();\n}\n\/\/ \u30ad\u30fc\u5165\u529b\nfunction keyHandler(e) {\n\tvar k = e.keyCode;\n\tconsole.log("key=" + k);\n\tif (k == 13 || k == 32) {\n\t\tneedRotate = true;\n\t\te.preventDefault();\n\t}\n}\n\/\/ \u30dc\u30bf\u30f3\u5165\u529b\nfunction rButtonHandler(e) {\n\tneedRotate = true;\n}\n\/\/ \u6574\u6570\u306e\u4e71\u6570\u3092\u8fd4\u3059\nfunction rnd(n) {\n\treturn Math.floor(Math.random() * n);\n}\n\/\/ DOM\u8981\u7d20\u306e\u53d6\u5f97\nfunction $(id) {\n\treturn document.getElementById(id);\n}\n\n\/\/ \u6307\u5b9a\u306e\u30da\u30fc\u30b8\u3092\u8868\u793a\nfunction showPage(pageId) {\n\tvar ps = document.querySelectorAll("[data-role='page']");\n\tfor (var i = 0; i < ps.length; i++) {\n\t\tvar e = ps[i];\n\t\tif (e.id == pageId) {\n\t\t\te.style.display = "block";\n\t\t}else{\n\t\t\te.style.display = "none";\n\t\t}\n\t}\n}<\/code><\/pre><\/div>\n","protected":false},"excerpt":{"rendered":"
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