多人賽車 | JavaScript 程式專案

{"id":17881,"student_id":1407,"content":"var target_1 = createSprite(\"target.jpg\");\r\nvar target_2 = createSprite(\"target.jpg\");\r\ntarget_2.y = -260;\r\nvar border = createSprite(\"border.png\");\r\nvar car = createSprite(\"blue.png\");\r\nvar objects = [target_1,target_2,border,car];\r\nvar speed = 3;\r\nvar round = 0;\r\nvar ID = Date.now()\r\nvar hostid = ID\r\nvar name = prompt(\"你的名字？\");\r\nvar users = {};\r\nvar cars = {};\r\nfunction startGame(){\r\n    car.moveTo(border)\r\n    car.direction = 45\r\n    users[ID].status = 1\r\n}\r\nusers[ID]={\r\n   id:ID,\r\n   name:name,\r\n   status:0,\r\n   offsetX:0,\r\n   offsetY:0,\r\n   direction:0,\r\n   updateTime:0\r\n}\r\ncars[ID] = car;\r\nforever(function(){\r\n   if(key.right){\r\n       car.direction += 3;\r\n   }\r\n   if(key.left){\r\n       car.direction -=3;\r\n   }\r\n   if(speed\u003c8){\r\n       speed+=0.3;\r\n   }\r\n   if(car.touched(border)){\r\n       if(speed\u003e0.5){\r\n           speed -=0.5;\r\n       }\r\n   }\r\n   if(users[ID].status == 1){\r\n       car.stepForward(speed);\r\n    }\r\n   var offsetX = car.x - 320;\r\n   var offsetY = car.y - 240;\r\n   for(var i=0;i\u003cobjects.length;i++){\r\n       objects[i].move(-offsetX,-offsetY);\r\n   }\r\n   if(car.touched(target_2)){\r\n       round = 1;\r\n   }\r\n   if(car.touched(target_1)\u0026\u0026round==1){\r\n       stop();\r\n   }\r\n});\r\n//車尾燈\r\nforever(function(){\r\n       var fire = createSprite(\"blue.png\");\r\n       fire.moveTo(car);\r\n       fire.direction = car.direction;\r\n       objects.push(fire);\r\n       fire.forever(function(){\r\n       /* Do this every tick */\r\n           this.scale -= 0.03;\r\n           this.opacity-=0.03;\r\n           if(this.scale\u003c0 || this.opacity\u003c0){\r\n               this.destroy();\r\n           }\r\n       });   \r\n});\r\nforever(function(){\r\n   users[ID].offsetX = car.x - border.x;\r\n   users[ID].offsetY = car.y - border.y;\r\n   users[ID].direction = car.direction;\r\n   users[ID].updateTime = Date.now();\r\n   DB.broadcast(\"update\",users[ID]);\r\n   for(var id in users) {\r\n       if(id \u003c hostid) {\r\n           hostid = id\r\n       }\r\n   }\r\n   var h = 0;\r\n   for(var id in users){\r\n       h++;\r\n       if(id == hostid) {\r\n         print(users[id].name +'防主' ,10,20*h,\"red\")\r\n       } else {\r\n         print(users[id].name,10,20*h,\"red\");\r\n        }\r\n        print(users[id].name,car.x,car.y)\r\n       cars[id].x = users[id].offsetX + border.x;\r\n       cars[id].y = users[id].offsetY + border.y;     \r\n       cars[id].direction = users[id].direction;\r\n       if(Date.now()\u003eusers[id].updateTime + 1000) {\r\n           cars[id].destroy()\r\n           delete cars[id]\r\n           delete users[id]\r\n       }\r\n   }\r\n});\r\nDB.onMessage(\"update\",function(data){\r\n   if(users[data.id]){\r\n       users[data.id] = data;\r\n   }else{\r\n       users[data.id] = data;\r\n       var car = createSprite(\"gold.png\");\r\n       cars[data.id] = car;\r\n   }\r\n})\r\n\r\nwhen('keydown','enter',function(){\r\n    if(status == 0){\r\n        if(hostid=ID) {\r\n            startGame()\r\n        }\r\n    }\r\n    DB.broadcast('startGame')\r\n})\r\nDB.onMessage('startGame',startGame);","created_at":"2017-03-01T20:52:04.729+08:00","updated_at":"2019-10-19T18:55:18.128+08:00","name":"多人賽車","language":"javascript","screenshot":{"url":"https://cdn1.koding.school/uploads/project/screenshot/17881/e0b063d38368d7dbd210f3213bda9fc5.jpg"},"parent_id":17296,"plugin":"","description":null,"note":null,"status":"public","like_student_ids":[],"is_featured":false,"views":293,"hashid":"gk4skz2y","is_content_changed":false,"review_status":"unsubmitted","submitted_at":null,"reviewed_at":null,"advise":null,"is_deleted":false}