{"id":15073,"date":"2019-09-09T09:00:18","date_gmt":"2019-09-09T00:00:18","guid":{"rendered":"https:\/\/www.agent-grow.com\/self20percent\/?p=15073"},"modified":"2019-09-04T08:30:03","modified_gmt":"2019-09-03T23:30:03","slug":"javascript-physics-animation-5","status":"publish","type":"post","link":"https:\/\/www.agent-grow.com\/self20percent\/2019\/09\/09\/javascript-physics-animation-5\/","title":{"rendered":"Web \u3067\u7269\u7406\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u30fb\u305d\u306e5(\u6700\u7d42\u56de) \u300c\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u304a\u3046\u300d"},"content":{"rendered":"<h1>\u524d\u56de\u306e\u56de\u7b54<\/h1>\n<p>\u524d\u56de\u306e\u5bbf\u984c\u306f\u3001\u30d0\u30a6\u30f3\u30c9\u6642\u306e\u8df3\u306d\u8fd4\u308a\u65b9\u3092\u5236\u5fa1\u3059\u308b\u3093\u3067\u3057\u305f\u306d\u3002<\/p>\n<p>\u3067\u306f\u56de\u7b54\u3002<\/p>\n<pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nconst main = () =\uff1e {\n  const canvas = document.getElementById(\u2019canvas\u2019);\n  const ctx = canvas.getContext(\u20192d\u2019);\n\n\n  \/\/ -------------- \u8a08\u7b97\u7528\u5b9a\u6570\u5b9a\u7fa9 -------------- \/\/\n  \/\/ \u958b\u59cb\u6642\u70b9\u306e\u6642\u9593\u3092\u53d6\u5f97\u3057\u3066\u304a\u304f\n  let prev_time = new Date();\n\n  \/\/ \u30dc\u30fc\u30eb\u306e\u534a\u5f84\n  const r = 10;\n\n  \/\/ \u30dc\u30fc\u30eb\u306e\u521d\u671f\u5ea7\u6a19\n  let x = 50;\n  let y = 440;\n\n  \/\/ \u30dc\u30fc\u30eb\u306e\u521d\u901f\u5ea6\n  let vx = 30;\n  let vy = -80;\n\n  \/\/ \u91cd\u529b\u52a0\u901f\u5ea6\n  const a = 10;\n\n  \/\/ \u53cd\u767a\u4fc2\u6570\n  const e = 0.8;\n\n   \/\/ -------------- \u63cf\u753b\u51e6\u7406 -------------- \/\/\n  const draw = () =\uff1e {\n    ctx.clearRect(0, 0, 640, 480);\n    \/\/ \u73fe\u5728\u6642\u523b\u3092\u53d6\u5f97\n    const now = new Date();\n    \/\/ \u958b\u59cb\u6642\u70b9\u304b\u3089\u73fe\u5728\u307e\u3067\u306e\u7d4c\u904e\u6642\u9593\n    const diffSecond = (now.getTime() - prev_time.getTime()) * 0.01;\n\n    \/\/ \u6b21\u306e\u8a08\u7b97\u306b\u5099\u3048\u3066\u3001 prev_time \u306b now \u3092\u4ee3\u5165\n    prev_time = now;\n\n    \/\/ \u73fe\u5728\u306e x \u8ef8\u65b9\u5411\u306e\u4f4d\u7f6e\n    x = x + (vx * diffSecond);\n\n    \/\/ \u6a2a\u65b9\u5411\u306b\u98db\u3073\u51fa\u3057\u3066\u3044\u305f\u3089\u3001\u58c1\u306b\u3076\u3064\u304b\u3063\u3066\u3044\u308b\u3068\u5224\u5b9a\n    if (x \uff1c 0) {\n      x = -x;  \/\/ \u58c1\u304b\u3089\u98db\u3073\u51fa\u3057\u305f\u5206\u3092\u623b\u3059\n      vx = -vx;  \/\/ \u52d5\u304d\u3092\u53cd\u8ee2\n    }\n    else if (x \uff1e 640) {\n      x = 640 - (x - 640);  \/\/ \u58c1\u304b\u3089\u98db\u3073\u51fa\u3057\u305f\u5206\u3092\u623b\u3059\n      vx = -(vx * e);  \/\/ \u52d5\u304d\u3092\u53cd\u8ee2\n    }\n\n    \/\/ \u73fe\u5728\u306e y \u8ef8\u65b9\u5411\u306e\u4f4d\u7f6e\n    y = y + ((vy * diffSecond) + (0.5 * a * diffSecond * diffSecond));\n\n    \/\/ \u4e0b\u65b9\u5411\u306b\u98db\u3073\u51fa\u3057\u3066\u3044\u305f\u3089\u3001\u5e8a\u306b\u3076\u3064\u304b\u3063\u3066\u3044\u308b\u3068\u5224\u5b9a\n    if (y \uff1e 480) {\n      y = 480 - (y - 480); \/\/ \u5e8a\u304b\u3089\u98db\u3073\u51fa\u3057\u305f\u5206\u3092\u623b\u3059\n      vy = -(vy * e);  \/\/ \u52d5\u304d\u3092\u53cd\u8ee2\n    }\n    else {\n      vy = vy + (a * diffSecond);  \/\/ \u5e8a\u306b\u3076\u3064\u304b\u3063\u3066\u3044\u306a\u3044\u6642\u306f\u901a\u5e38\u901a\u308a\u306e\u52d5\u304d\u3092\u3055\u305b\u308b\n    }\n\n    ctx.fillStyle = \u2019rgb(63, 81, 181)\u2019;\n    ctx.beginPath();\n    ctx.arc(x, y, r, 0, Math.PI*2, false)\n    ctx.fill();\n\n    \/\/ \u6b21\u56de\u753b\u9762\u66f4\u65b0\u6642\u306b draw \u3092\u5b9f\u884c\u3059\u308b\u3088\u3046\u306b\u6307\u5b9a\n    requestAnimationFrame(draw);\n  };\n\n  \/\/ \u4e00\u56de\u76ee\u63cf\u753b\u5b9f\u884c\n  draw();\n};\n\ndocument.addEventListener(\u2019DOMContentLoaded\u2019, main);\n<\/pre>\n<p>\u65b0\u3057\u304f\u5165\u3063\u3066\u3044\u308b\u306e\u306f\u53cd\u767a\u4fc2\u6570\u3068\u547c\u3070\u308c\u308b\u3082\u306e\u3067\u3059\u306d\u3002<\/p>\n<p>x, y \u65b9\u5411\u3069\u3061\u3089\u3082<\/p>\n<pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nvy = -(vy * e);  \/\/ \u52d5\u304d\u3092\u53cd\u8ee2\n<\/pre>\n<p>\u3053\u3093\u306a\u611f\u3058\u3067\u3001\u52d5\u304d\u304c\u53cd\u8ee2\u3059\u308b\u3068\u304d\u306b\u53cd\u767a\u4fc2\u6570 <code>e<\/code> \u3092\u304b\u3051\u3066\u3044\u307e\u3059\u3002<br \/>\n\u3053\u308c\u306b\u3088\u3063\u3066\u3001\u901f\u5ea6\u304c\u6e1b\u8870\u3059\u308b\u3088\u3046\u306b\u306a\u308b\u306e\u3067\u3059\u306d\u3002<\/p>\n<h1>\u6700\u7d42\u56de\uff01<\/h1>\n<p>\u3055\u3066\u30015 \u56de\u7d9a\u3051\u305f\u7269\u7406\u6f14\u7b97\u30cd\u30bf\u3082\u4eca\u56de\u304c\u6700\u5f8c\u3067\u3059\u3002<\/p>\n<p>\u3053\u3053\u307e\u3067\u304d\u305f\u3089\u4e8c\u3064\u306e\u30dc\u30fc\u30eb\u306e\u885d\u7a81\u3068\u304b\u3084\u308a\u305f\u3044\u306a\u30fc\u3068\u304b\u601d\u3044\u307e\u3059\u3088\u306d\uff1f<br \/>\n\u79c1\u3082\u3061\u3087\u3063\u3068\u601d\u3063\u3066\u3044\u305f\u306e\u3067\u3059\u304c\u3001\u6b8b\u5ff5\u306a\u304c\u3089\u30dc\u30fc\u30eb\u540c\u58eb\u306e\u885d\u7a81\u306f\u7d50\u69cb\u96e3\u3057\u3044\u3093\u3067\u3059\u3088\u306d\u3002<\/p>\n<p>\u3068\u3044\u3046\u306e\u3082\u3001\u3076\u3064\u304b\u308b\u3068\u304d\u306e\u304a\u4e92\u3044\u306e\u89d2\u5ea6\u3082\u8003\u616e\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u306e\u3067<br \/>\n\u58c1\u3068\u306e\u885d\u7a81\u306e\u3088\u3046\u306b\u5358\u7d14\u306b\u901f\u5ea6\u3092\u53cd\u8ee2\u3057\u305f\u308a\u3059\u308b\u3060\u3051\u3067\u306f\u305d\u308c\u3063\u307d\u3044\u611f\u3058\u306b\u306a\u3089\u306a\u3044\u306e\u3067\u3059\u3002<\/p>\n<p>\u3068\u3044\u3046\u3053\u3068\u3067\u3001\u6700\u7d42\u56de\u306f\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n<h1>\u7269\u7406\u6f14\u7b97\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u3046\uff01<\/h1>\n<p>\u3053\u308c\u307e\u3067 canvas \u4e0a\u3067\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u308f\u305a\u7269\u7406\u6f14\u7b97\u3057\u3066\u304d\u305f\u306e\u306f\u3001<br \/>\n\u7269\u7406\u6f14\u7b97\u3063\u3066\u30b7\u30f3\u30d7\u30eb\u306b\u8003\u3048\u305f\u3089\u3053\u3093\u306a\u611f\u3058\u3067\u7c21\u5358\u306b\u304b\u3051\u308b\u3093\u3060\u3088\u3068\u3044\u3046\u306e\u3092\u898b\u3066\u3082\u3089\u3044\u305f\u304b\u3063\u305f\u306e\u3067\u3059\u304c\u3001<br \/>\n\u3082\u3046\u3061\u3087\u3063\u3068\u8907\u96d1\u306a\u4e8b\u3092\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001\u7d50\u69cb\u6570\u5b66\u3092\u9811\u5f35\u3089\u306a\u3044\u3068\u884c\u3051\u306a\u304f\u306a\u3063\u3066\u304d\u307e\u3059\u3002<\/p>\n<p>\u305d\u308c\u306f\u305d\u308c\u3067\u3001\u9811\u5f35\u308b\u306e\u3082\u826f\u3044\u306e\u3067\u3059\u304c\u3001\u3053\u308c\u306f\u8a66\u9a13\u3067\u306f\u306a\u3044\u3067\u3059\u304b\u3089\u306d\u3002<br \/>\n\u81ea\u529b\u3067\u89e3\u304f\u5fc5\u8981\u306f\u5168\u304f\u306a\u3044\u306e\u3067\u3001\u30e9\u30af\u3067\u304d\u308b\u3068\u3053\u308d\u306f\u30e9\u30af\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u3068\u3044\u3046\u3053\u3068\u3067\u3001\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<p>https:\/\/github.com\/liabru\/matter-js<\/p>\n<p>matter-js \u3068\u3044\u3046\u3001\u30b7\u30f3\u30d7\u30eb\u306a 2 \u6b21\u5143\u7269\u7406\u6f14\u7b97\u7528\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u3059\u3002<\/p>\n<p>\u6b8b\u5ff5\u306a\u304c\u3089 2018 \u5e74\u672b\u3054\u308d\u304b\u3089\u66f4\u65b0\u304c\u6b62\u307e\u3063\u3066\u3044\u308b\u3088\u3046\u3067\u3059\u304c\u3001<br \/>\n\u4e00\u901a\u308a\u6f14\u7b97\u306b\u56f0\u3089\u306a\u3044\u7a0b\u5ea6\u306e\u3082\u306e\u306f\u7528\u610f\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3053\u308c\u3092\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u3046\u306b\u306f\u3001HTML \u306b script \u30bf\u30b0\u3092\u8ffd\u52a0\u3057\u305f\u3089\u3044\u3044\u3067\u3059\u306d\u3002<\/p>\n<p>https:\/\/www.jsdelivr.com\/package\/npm\/matter-js<\/p>\n<p>jsdelivr \u304b\u3089\u53d6\u5f97\u3067\u304d\u308b\u306e\u3067\u3001<br \/>\n\u30b9\u30af\u30ea\u30d7\u30c8\u30bf\u30b0\u3092<\/p>\n<pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n\uff1cscript src=&amp;quot;https:\/\/cdn.jsdelivr.net\/npm\/matter-js@0.14.2\/build\/matter.min.js&amp;quot;\uff1e\uff1c\/script\uff1e\n\uff1cscript src=&amp;quot;.\/index.js&amp;quot;\uff1e\uff1c\/script\uff1e\n<\/pre>\n<p>\u3053\u3093\u306a\u611f\u3058\u3067\u3001index.js \u306e\u524d\u306b\u8aad\u307f\u8fbc\u3080\u3088\u3046\u306b html \u306e\u65b9\u306b\u8a2d\u5b9a\u3057\u307e\u3057\u3087\u3046\u3002<br \/>\n(\u9806\u756a\u304c\u9006\u3060\u3068\u3046\u307e\u304f\u52d5\u304b\u306a\u3044\u306e\u3067\u3054\u6ce8\u610f)<\/p>\n<p>js \u306f\u524d\u56de\u3068\u306f\u30ac\u30e9\u30c3\u3068\u5909\u308f\u3063\u3066\u3053\u3093\u306a\u611f\u3058\u3067\u3002<\/p>\n<pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n\/\/ \u30e2\u30b8\u30e5\u30fc\u30eb\u8a2d\u5b9a\nconst Engine = Matter.Engine,\n    Render = Matter.Render,\n    World = Matter.World,\n    Bodies = Matter.Bodies,\n    Body = Matter.Body;\n\n\/\/ \u7269\u7406\u30a8\u30f3\u30b8\u30f3\u4f5c\u6210\nvar engine = Engine.create();\n\n\/\/ canvas \u53d6\u5f97\nconst canvas = document.getElementById(\u2019canvas\u2019);\n\n\/\/ \u753b\u9762\u4f5c\u6210\nvar render = Render.create({\n    canvas,\n    engine: engine,\n    options: {\n      width: canvas.width,\n      height: canvas.height,\n      background: \u2019#FFF\u2019,\n      wireframes: false\n    }\n});\n\n\/\/ \u58c1\u3092\u8ffd\u52a0\nWorld.add(engine.world, &#x5B;\n  Bodies.rectangle(canvas.width \/ 2, canvas.height - 10, canvas.width, 20, { isStatic: true }),\n  Bodies.rectangle(canvas.width - 10, canvas.height \/ 2, 20, canvas.height, { isStatic: true }),\n  Bodies.rectangle(10, canvas.height \/ 2, 20, canvas.height, { isStatic: true }),\n]);\n\n\/\/ \u4e8c\u3064\u306e\u5186\u3092\u4f5c\u6210\nvar ballA = Bodies.circle(400, 200, 10, { restitution: 1.2 });\nvar ballB = Bodies.circle(200, 50, 10, { restitution: 1.2 });\n\n\/\/ \u4f5c\u6210\u3057\u305f\u5186\u3092\u8ffd\u52a0\nWorld.add(engine.world, &#x5B;ballA, ballB]);\n\n\/\/ \u30dc\u30fc\u30ebA, B \u306b\u6295\u3052\u308b\u529b\u3092\u52a0\u3048\u308b\nBody.applyForce(\n  ballA,\n  { x: ballA.position.x, y: ballA.position.y },\n  { x: 0.01, y: 0.005 }\n);\nBody.applyForce(\n  ballB,\n  { x: ballB.position.x, y: ballB.position.y },\n  { x: -0.01, y: 0.003 }\n);\n\n\/\/ \u7269\u7406\u8a08\u7b97\u958b\u59cb\nEngine.run(engine);\n\n\/\/ \u753b\u9762\u63cf\u753b\u958b\u59cb\nRender.run(render);\n<\/pre>\n<p>\u3053\u308c\u3060\u3051\u3067\u7d50\u679c\u306f\u3053\u3046\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"15075\" data-permalink=\"https:\/\/www.agent-grow.com\/self20percent\/2019\/09\/09\/javascript-physics-animation-5\/anim-22\/\" data-orig-file=\"https:\/\/www.agent-grow.com\/self20percent\/wp-content\/uploads\/2019\/09\/anim.gif\" data-orig-size=\"649,485\" data-comments-opened=\"1\" 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