1回答

• 

  morninggair

  2018-04-06 09:35:23

  //绘制果实

  
  

  var fruitObj = function()

  {

  this.alive = [];//bool

  this.x = [];

  this.y = [];

  this.l = [];

  this.spd = [];

  this.fruitType = [];

  this.orange = new Image();

  this.blue = new Image();

  }

  fruitObj.prototype.num = 30;

  fruitObj.prototype.init = function()

  {

  for(var i = 0; i < this.num; i++)

  {

  this.alive[i] = false;

  this.x[i] = 0;

  this.y[i] = 0;

  this.l[i] = 0;

  this.spd[i] = Math.random() * 0.017 + 0.003;  //[0.003,0.02)

  this.fruitType[i] = "";

  }

  this.orange.src = "./SRC/fruit.png";

  this.blue.src = "./SRC/blue.png";

  }

  fruitObj.prototype.draw = function()

  {

  for(var i = 0; i < this.num; i++)

  {

  //draw

  //find an ane,grow,fly,up

  if(this.alive[i])

  {

  if(this.fruitType[i] == "blue")

  {

  var pic = this.blue;

  }

  else

  {

  var pic = this.orange;

  }

  if(this.l[i] <= 14)

  {

  this.l[i] += this.spd[i] * deltaTime;

  }

  else

  {

  this.y[i] -= this.spd[i] * 7 * deltaTime;

  }

  ctx2.drawImage(pic, this.x[i] - this.l[i] * 0.5, this.y[i] - this.l[i] * 0.5, this.l[i], this.l[i]);

  if(this.y[i] < 10)

  {

  this.alive[i] = false;

  }

  }

  }

  }

  
  

  fruitObj.prototype.born = function(i)

  {

  var aneID = Math.floor(Math.random() * ane.num);

  this.x[i] = ane.x[aneID];

  this.y[i] = canHeight - ane.len[aneID];

  this.l[i] = 0;

  this.alive[i] = true;

  var ran = Math.random();

  if(ran < 0.2)

  {

  this.fruitType[i] = "blue";  //orange,blue

  }

  else

  {

  this.fruitType[i] = "orange";

  }

  }

  
  

  fruitObj.prototype.dead = function(i)

  {

  this.alive[i] = false;

  }

  
  

  function fruitMonitor()

  {

  var num = 0;

  for(var i = 0; i < fruit.num; i++)

  {

  if(fruit.alive[i])

  num++;

  }

  if(num < 15)

  {

  //send fruit

  sendFruit();

  return;

  }

  }

  
  

  function sendFruit()

  {

  for(var i = 0; i < fruit.num; i++)

  {

  if(!fruit.alive[i])

  {

  fruit.born(i);

  return;

  }

  }

  }

  
  

  
  

  应该是代码有的地方打错了，这个代码是对的，你可以看一下

  0 0