LÖVE

Posted: **Sun Mar 10, 2013 1:57 pm**

Hi guys,
I'm trying to program enemies, but i've run into a little problem. Right now, the object for the enemies is very basic - a body with some functions to get coordinates and sprite. Here is the code for the object

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function spawnEnemy(enemyx,enemyy)
	enemy = {}
	enemy.body = love.physics.newBody(world, enemyx, enemyy, "dynamic")
  enemy.shape = love.physics.newCircleShape(15) 
  enemy.fixture = love.physics.newFixture(enemy.body, enemy.shape, 1) 
  enemy.fixture:setRestitution(0.3)
  enemy.graphic = enemyr
	function enemy.setImage(Image)
	enemy.graphic = Image
	end
	function enemy.getImage()
	return enemy.graphic
	end
	function enemy.getX()
	return enemy.body:getX()
	end
	function enemy.getY()
	return enemy.body:getY()
	end
	function enemy.getXY()
	return enemy.body:getX() .. enemy.body:getY()
	
	end
return enemy
end

Then I spawn some of this objects with

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enemy1 = spawnEnemy(150,500)
enemy2 = spawnEnemy(500,500)

I will probably use arrays later on but for now i use this for testing.
Here is where the problem appears, no matter how many of these objects i have spawned, only one thing will be drawn on the screen by using

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love.graphics.draw(enemy1:getImage(),enemy1:getX(),enemy1:getY())
love.graphics.draw(enemy2:getImage(),enemy2:getX(),enemy2:getY())

Always, one of the objects is drawn, the other one behaves correctly with collision and other physics stuff, but it appears invisible.
Thanks and I hope that im not being annoying with my struggles.

Posted: **Sun Mar 10, 2013 4:10 pm**

Try

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love.graphics.setColor(255,255,255)

to set the sprites to a blank color, that might be the problem.

Posted: **Sun Mar 10, 2013 10:43 pm**

I have a tip.

Don't create all your objects like that. You have enemy1, enemy2, enemy3, etc. Instead create an enemy table:

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enemy = {}

Then add objects to it like so:

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enemy[id] = spawnEnemy(x,y)

You can also insert it into the enemy table with table.insert but I prefer to just create them this way. My prefered method is where id will = #enemy+1. #enemy returns how many items are in the enemy table.

Then when you need to update or draw or otherwise refer to all your enemies at once, you'd loop through them thusly:

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for i, e in pairs(enemy) do
  -- You'd use e as a reference to the enemy.
  -- So for instance if you want to draw at the enemy's X and Y it would just be e.x or e.y or as in your code
  -- e.getX() and e.getY() or e.graphic or e.whatever.
  -- That's what the e means in the for line. The i will be returned as the current number, basically the id in the code above.
end

For pairs will loop through all the objects in the enemy table for you returning i for the ID of the table row and e for a reference to the object as explained above.

It's much much MUCH better than having separate enemy objects since you can't maintain that very well at all when it gets much more complicated.

LÖVE

Only one of many objects is drawn

Only one of many objects is drawn

Re: Only one of many objects is drawn

Re: Only one of many objects is drawn