Action Script 3. Spawn objects in different time - actionscript-3

Question

I'm creating game where falling 4 different objects from the sky and need to destroy them by clicking mouse button. My problem is that all 4 objects spawns at the same time. I need to make that randomly spawned all 4, but not in the same time and after player have 200 points I need to make that spawned and falled more objects. (I have working counter which counting points).
And one more thing if you know how to make that objects not spawned on one other.
I mean:
Bad spawn.
Here is my constant vars:
public static const GRAVITY:Number = 3;
public static const HIT_TOLERANCE:Number = 50;
//Powerup
public static const APPLE_END_Y:Number = 640;
public static const APPLE_SPAWN_CHANCE:Number = 0.02; //per frame per second
public static const APPLE_START_Y:Number = 110;
public static const APPLE_SPAWN_START_X:Number = 50;
public static const APPLE_SPAWN_END_X:Number = 500;
//Scoring
public static const PLAYER_START_SCORE:Number = 0;
public static const SCORE_PER_APPLE:Number = 10;
Here is part of my code:
public function startGame()
{
speed = C.PLAYER_SPEED;
gravity = C.GRAVITY;
score = C.PLAYER_START_SCORE;
randomChance = C.APPLE_SPAWN_CHANCE;
tol = C.HIT_TOLERANCE;
apples = new Array();
mcGameStage.addEventListener(Event.ENTER_FRAME,update);
}
private function update(evt:Event)
{
//Spawn new apples
if (Math.random() < randomChance)
{
//spawn x coordinates
var newPirmas = new Pirmas();
newPirmas.x = Math.random() * C.APPLE_SPAWN_END_X + C.APPLE_SPAWN_START_X;
var newAntras = new Antras();
newAntras.x = Math.random() * C.APPLE_SPAWN_END_X + C.APPLE_SPAWN_START_X;
var newTrecias = new Trecias();
newTrecias.x = Math.random() * C.APPLE_SPAWN_END_X + C.APPLE_SPAWN_START_X;
var newApple = new Apple();
newApple.x = Math.random() * C.APPLE_SPAWN_END_X + C.APPLE_SPAWN_START_X;
//spawn y coordinates
newPirmas.y = C.APPLE_START_Y;
newAntras.y = C.APPLE_START_Y;
newTrecias.y = C.APPLE_START_Y;
newApple.y = C.APPLE_START_Y;
apples.push(newPirmas);
apples.push(newAntras);
apples.push(newTrecias);
apples.push(newApple);
newPirmas.addEventListener(MouseEvent.CLICK, onClick);
newAntras.addEventListener(MouseEvent.CLICK, onClick);
newTrecias.addEventListener(MouseEvent.CLICK, onClick);
newApple.addEventListener(MouseEvent.CLICK, onClick);
mcGameStage.addChildAt(newPirmas,0);
mcGameStage.addChildAt(newAntras,0);
mcGameStage.addChildAt(newTrecias,0);
mcGameStage.addChildAt(newApple,0);
}
//Move Apples
for (var i = apples.length-1; i >= 0; i--)
{
apples[i].y += gravity;
if (apples[i].y > C.APPLE_END_Y)
{
mcGameStage.removeChild(apples[i]);
apples.splice(i,1);
m_iLives--;
if (!m_iLives)
{
trace("Game Over");
// newApple.removeEventListener(MouseEvent.CLICK, onClick);
break;
}
}
}
txtScore.text = String(score);
}
function onClick(evt:MouseEvent):void{
var apples = evt.target;
apples.visible = false;
apples = tol;
score += C.SCORE_PER_APPLE;
}
}

Answer 1

public function startGame()
{
speed = C.PLAYER_SPEED;
gravity = C.GRAVITY;
score = C.PLAYER_START_SCORE;
randomChance = C.APPLE_SPAWN_CHANCE;
tol = C.HIT_TOLERANCE;
apples = [];
itemsToSpawn = [];
mcGameStage.addEventListener(Event.ENTER_FRAME,update);
nextSpawn:Number = 0;
}
private function update(evt:Event)
{
//Spawn new apples
if (Math.random() < randomChance)
{
//spawn x coordinates
var newPirmas = new Pirmas();
newPirmas.x = Math.random() * C.APPLE_SPAWN_END_X + C.APPLE_SPAWN_START_X;
var newAntras = new Antras();
newAntras.x = Math.random() * C.APPLE_SPAWN_END_X + C.APPLE_SPAWN_START_X;
var newTrecias = new Trecias();
newTrecias.x = Math.random() * C.APPLE_SPAWN_END_X + C.APPLE_SPAWN_START_X;
var newApple = new Apple();
newApple.x = Math.random() * C.APPLE_SPAWN_END_X + C.APPLE_SPAWN_START_X;
//spawn y coordinates
newPirmas.y = C.APPLE_START_Y;
newAntras.y = C.APPLE_START_Y;
newTrecias.y = C.APPLE_START_Y;
newApple.y = C.APPLE_START_Y;
newPirmas.addEventListener(MouseEvent.CLICK, onClick);
newAntras.addEventListener(MouseEvent.CLICK, onClick);
newTrecias.addEventListener(MouseEvent.CLICK, onClick);
newApple.addEventListener(MouseEvent.CLICK, onClick);
//add items to itemsToAdd
itemsToAdd.push(newPirmas, newAntras, newTrecias, newApple);
}
//Move Apples
for (var i = apples.length-1; i >= 0; i--)
{
apples[i].y += gravity;
if (apples[i].y > C.APPLE_END_Y)
{
mcGameStage.removeChild(apples[i]);
apples.splice(i,1);
m_iLives--;
if (!m_iLives)
{
trace("Game Over");
// newApple.removeEventListener(MouseEvent.CLICK, onClick);
break;
}
}
}
txtScore.text = String(score);
if( itemsToSpawn.length > 0 && getTimeout() > nextSpawn )
{
var item:DisplayObject = itemsToAdd.shift();
apples.push(item);
mcGameStage.addChild(item);
nextSpawn = getTimeout() + Math.random() * 4000;
}
}
function onClick(event:MouseEvent):void
{
var apples = event.currentTarget;
apples.visible = false;
apples = tol;
score += C.SCORE_PER_APPLE;
if(score % 100 == 0)
{
gravity += 10;
}
}

Answer 2

In your update code, you're checking a single time for a random value to be less than randomChance, and when it is, you spawn 4 apples.
If you want them to spawn at different times, you would call them one at a time. I would make a function to create a randomly placed apple, and call that whenever your if statement is satisfied.
Eg:
private function update(evt:Event){
if(Math.random() < randomValue){
createApple();
}
Where createApple() would create a new apple, position it, add it to the array, and add it to the stage.
If you're trying to create a different apple each time, you can put the different types in an array and iterate through it as you create new apples.
EG.
private function createApple(){
...
var newApple = appleToSpawn[currentApple]
...
}
Where appleToSpawn is an array of apple objects, and currentApple is an index of which apple you're currently on.
Alternatively, you could do a series of comparisons to a random number, and spawn a different apple depending on which condition is satisfied.
As for making sure they don't overlap, you can keep a history of their spawn points, and change how you get their random X value. Just iterate through the array of previous X values, and make sure the new one isn't within (oldX + (width/2)).
Now for spawning more than 4 as you get more points, just change your randomChance to a bigger number as you go. If it's a bigger number, you'll satisfy your conditional statement more often, therefor spawning more apples.