火箭降落 AI 副本 | JavaScript 程式專案

{"id":129667,"student_id":10,"content":"var DNA_LENGTH = 500; // 每個火箭的基因長度\nvar SIZE = 30; // 每一個世代的火箭個數\nvar rockets = []; // 存放所有的火箭\n\n// 初始化所有的火箭\nfor (var i = 0; i \u003c SIZE; i++) {\n    var rocket = new Rocket();\n    rockets.push(rocket);\n    rocket.fire();\n    rocket.gens = randomGens();\n}\n\n// 當所有的火箭都停止，執行nextGeneration 產生下一代火箭\nforever(function(){\n    for (var i=0; i \u003c rockets.length; i++) {\n        if (rockets[i].active) return;\n    }\n    nextGeneration();\n});\n\n// 產生隨機的初始化基因\nfunction randomGens () {\n    var gens = [];\n    for (var i=0; i\u003cDNA_LENGTH; i++) {\n        gens.push(Math.floor(Math.random()*4));\n    }\n    return gens;\n}\n\n// 產生下一個世代\nfunction nextGeneration () {\n    // 火箭的數值 = 落地時與平台間水平x距離 + 火箭垂直下降的速度\n    rockets.forEach((rocket) =\u003e {\n        rocket.score = Math.abs(rocket.vy) + Math.abs(rocket.x - platform.x);\n    });\n    // 依據分數排序，越小的排在越前面\n    rockets.sort(function (a, b) {\n        return a.score - b.score;\n    })\n    // 挑出表現最好的兩個火箭\n    var parentA = rockets[0];\n    var parentB = rockets[1];\n\n    parentA.opacity = 1;\n    parentB.opacity = 1;\n\n    //產生新的 30 組基因替換所有火箭原本的基因\n    for (var i=0; i\u003cSIZE; i++) {\n        rockets[i].gens = crossover(parentA.gens, parentB.gens); //產生新的基因替換火箭原本的基因\n        rockets[i].fire();\n    }\n}\n\n// 交配產生下一代基因\n// 每個基因有 2% 的機率突變，若不突變則各有 50% 的機率來自父親和母親\nfunction crossover (a, b) {\n    var gens = [];\n    for (var i=0; i\u003cDNA_LENGTH; i++) {\n        gens[i] = Math.random() \u003e 0.5 ? a[i] : b[i];\n        if (Math.random() \u003c 0.02) gens[i] = Math.floor(Math.random()*4);\n    }\n    return gens;\n}","created_at":"2020-03-05T18:40:19.661+08:00","updated_at":"2020-03-06T10:21:16.445+08:00","name":"火箭降落 AI 副本","language":"javascript","screenshot":{"url":"https://cdn8.koding.school/uploads/project/screenshot/129667/4b1ae58d54b1c8cdd3232e8462536c8d.jpg"},"parent_id":61788,"plugin":"var gravity = 0.08;\n\ncreateSprite('bg.png');\nvar platformA = createSprite('platform.png');\nvar platformB = createSprite('platform.png');\nplatformA.scale = 0.6;\nplatformB.scale = 0.6;\nplatformA.y = 430;\nplatformA.x = 90;\nplatformB.y = 430;\nplatformB.x = 550;\n\n// alias\nvar platform  = platformB;\n\nvar fires = [];\n\nforever(function () {\n    fires = fires.filter(function (obj) {\n        if (obj.scale \u003c= 0) {\n            obj.destroy();\n            return false;\n        }\n        return true;\n    });\n});\n\nfunction createFire (x, y, direction) {\n    var fire = createSprite('fire.png');\n    fire.moveTo(x, y);\n    fire.direction = direction + Math.random()*30 - 15;\n    fire.stepForward(30);\n    fires.push(fire);\n    fire.forever(function () {\n        fire.stepForward(2);\n        fire.scale -= 0.02;\n        fire.opacity -= 0.02;\n    })\n}\n\nfunction Rocket () {\n    var rocket = createSprite('rocket.png');\n\n    rocket.moveTo(platformA);\n    rocket.y -= 50;\n    rocket.gens = [];\n    rocket.direction = 0;\n    rocket.scale = 0.3;\n    rocket.vx = 0;\n    rocket.vy = 0;\n    rocket.clock = 0;\n    rocket.active = false;\n    rocket.cache = {};\n    rocket.layer = 1;\n\n    rocket.fire = function () {\n        rocket.moveTo(platformA);\n        rocket.y -= 50;\n        this.direction = 0;\n        this.scale = 0.3;\n        this.vx = 0;\n        this.vy = 0;\n        this.clock = 0;\n        this.active = true;\n        this.opacity = 1;\n    }\n\n    rocket.forever(function() {\n\n        if (!rocket.active) return;\n\n        rocket.direction = rocket.vx*10;\n        rocket.isFire = (\n            Math.abs(rocket.vx - rocket.cache.vx) \u003e 0.02 ||\n            rocket.vy - gravity - rocket.cache.vy != 0\n        )\n        rocket.cache.vx = rocket.vx;\n        rocket.cache.vy = rocket.vy;\n        \n        if (rocket.clock % 3 == 0 \u0026\u0026 rocket.isFire) {\n            rocket.isFire = false;\n            createFire(rocket.x, rocket.y, rocket.direction + 180);\n        }\n\n        var g = rocket.gens[rocket.clock];\n        rocket.clock++;\n        if (g == 0) rocket.vy -= 0.3;\n        else if (g == 1) rocket.vx += 0.1;\n        else if (g == 2) rocket.vx -= 0.1;\n\n        if (Math.abs(rocket.vx) \u003c 0.01) {\n            rocket.vx = 0;\n        } else {\n            rocket.vx += rocket.vx \u003e 0 ? -0.01 : 0.01;\n        }\n\n        rocket.vy += gravity;\n        rocket.x += rocket.vx;\n        rocket.y += rocket.vy;\n\n        if (rocket.touched([platformA, platformB]) || rocket.y \u003e= 440) {\n            rocket.active = false;\n            var score = Math.abs(rocket.vy) + Math.abs(rocket.x - platformB.x);\n            rocket.opacity = score \u003e 8 ? 0.1: 1;\n        }\n    })\n\n    return rocket;\n}","description":null,"note":null,"status":"public","like_student_ids":[],"is_featured":false,"views":256,"hashid":"jzmsmyyj","is_content_changed":false,"review_status":"unsubmitted","submitted_at":null,"reviewed_at":null,"advise":null,"is_deleted":false}