Spawn and remove objects/enemies (AS3 for Flash, Lua for Corona, Javascript for Unity)
Comments (0) This is the first post in a series of new samples that will show similar code translated into multiple engines, typically Flash(as3), Corona(Lua) and Unity(javascript), maybe even UDK too. This first example just spawns 10 squares(enemies) on the screen. If you click one, the square disappears. If you click the background, they all disappear. If you click the background when there are no squares, the squares will respawn.
Flash-AS3 – Flash source files
//create a table(array) to store the enemies
var enemyTable:Array = [];
//this function gets passed an enemy to remove
function removeEnemy(enemy){
//loop through the table
for( var i=0; i< enemyTable.length; i++ ){
//find the item in the table that is the same as the enemy
if(enemyTable[i] == enemy){
//remove the enemy from the table
enemyTable.splice(i,1);
//remove the enemy
removeChild(enemy);
//break out of the loop
break;
}
}
}
//listener that gets attached to each enemy
function touchListener(event:MouseEvent){
//
//
//find out which enemy we are talking about
var enemy = event.currentTarget;
//need to remove event listener, it's not automatically removed
enemy.removeEventListener( MouseEvent.CLICK, touchListener);
removeEnemy(enemy);
//
//
//
}
//spawnEnemies function
function spawnEnemies(){
//loop 10 times
for(var count:int = 0; count<10; count++){
//draw 10 rectangles at random locations
var enemy = new Sprite();
enemy.graphics.beginFill(0x8C8C8C);
enemy.graphics.lineStyle(3, 0xB4B4B4);
enemy.graphics.drawRect(0, 0, 50, 50);
enemy.x = Math.random()*stage.stageWidth;
enemy.y = Math.random()*stage.stageHeight;
addChild(enemy);
//add a touch event to each enemy
enemy.addEventListener( MouseEvent.CLICK, touchListener )
//add the enemy to the enemyTable
enemyTable.push(enemy);
}
}
//function called when you click the green bg
function removeAll( event:MouseEvent ){
//
//
//if all the enemies are gone, respawn them
if(enemyTable.length == 0){
spawnEnemies();
}else{
//loop through the table
for(var i:int=0;i<enemyTable.length; i++){
//remove each enemy
removeChild(enemyTable[i]);
}
//set the enemyTable to empty
enemyTable = [];
}
//
}
//draw the bg
var bg:Sprite = new Sprite();
bg.graphics.beginFill(0x99ff00);
bg.graphics.drawRect(0,0,stage.stageWidth, stage.stageHeight);
addChild(bg);
bg.addEventListener( MouseEvent.CLICK, removeAll )
//spawn the enmies
spawnEnemies();
Corona-Lua – Corona source files
--create a table(array) to store the enemies
local enemyTable = {};
--this function gets passed an enemy to remove
local function removeEnemy(enemy)
--loop through the table
for i=1,#enemyTable do
--find the item in the table that is the same as the enemy
if(enemyTable[i] == enemy) then
--remove the enemy from the table
table.remove (enemyTable,i )
--remove the enemy
enemy:removeSelf();
--break out of the loop
break;
end
end
end
--listener that gets attached to each enemy
local function touchListener( event )
--only do remove the enemy when the touch begins
if(event.phase=="began") then
--find out which enemy we are talking about
local enemy = event.target;
--don't need to remove event listener, it's automatically removed when you remove the object
--enemy:removeEventListener( "touch", touchListener );
removeEnemy(enemy);
--by returning true it prevents the touch event from continuing to the bg
return true
end
end
--spawnEnemies function
local function spawnEnemies()
--loop 10 times
for count = 1,10 do
--draw 10 rectangles at random locations
local enemy = display.newRect(math.random(display.contentWidth), math.random(display.contentHeight), 50, 50)
enemy.strokeWidth = 3;
enemy:setFillColor(140, 140, 140);
enemy:setStrokeColor(180, 180, 180);
--add a touch event to each enemy
enemy:addEventListener( "touch", touchListener )
--add the enemy to the enemyTable
enemyTable[count] = enemy;
end
end
--function called when you click the green bg
local function removeAll( event )
--only remove all when the touch first starts
if(event.phase=="began") then
--if all the enemies are gone, respawn them
if(#enemyTable == 0) then
spawnEnemies();
else
--loop through the table
for i=1,#enemyTable do
--remove each enemy
enemyTable[i]:removeSelf();
end
--set the enemyTable to empty
enemyTable = {};
end
end
end
--draw the bg
local bg = display.newRect(0,0,display.contentWidth, display.contentHeight)
bg:setFillColor(153, 255, 0)
bg:addEventListener( "touch", removeAll )
--spawn the enmies
spawnEnemies();
Unity-Javascript – Unity source files
//create a table(array) to store the enemies
var enemyTable:Array = [];
var enemyPreFab:GameObject;
//this function gets passed an enemy to remove
function removeEnemy(enemy){
print("removeEnemy()");
print(enemy);
//loop through the table
for( var i=0; i< enemyTable.length; i++ ){
//find the item in the table that is the same as the enemy
if(enemyTable[i] == enemy){
//remove the enemy from the table
enemyTable.splice(i,1);
//remove the enemy
Destroy(enemy);
//break out of the loop
break;
}
}
}
//spawnEnemies function
function spawnEnemies(){
//loop 10 times
for(var count:int = 0; count<10; count++){
//draw 10 rectangles at random locations
var position:Vector3 = Vector3(Random.Range(0, 16), Random.Range(0, 10), 0);
var enemy = Instantiate(enemyPreFab, position, Quaternion());
//add the enemy to the enemyTable
enemyTable.push(enemy);
}
}
//function called when you click the green bg
function removeAll(){
//
//
//if all the enemies are gone, respawn them
if(enemyTable.length == 0){
spawnEnemies();
}else{
//loop through the table
for(var i:int=0;i<enemyTable.length; i++){
//remove each enemy
Destroy(enemyTable[i]);
}
//set the enemyTable to empty
enemyTable = [];
}
//
}
function Start(){
//spawn the enmies
spawnEnemies();
}
function Update () {
if(Input.GetMouseButtonUp(0)){
var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
var hit:RaycastHit;
if (Physics.Raycast (ray, hit,100)) {
removeEnemy(hit.transform.gameObject);
}else{
removeAll();
}
}
}
Themocracy