• LOVE Lua OOP
7 replies, posted
• Hey, How might I go about making bullets? I've made a bullet class, but I can't figure out how I go about using them, as in, editing them once they're made. I have: [code] Bullet = {} Bullet.new = function(x, y) local self = {} local x = x or love.mouse.getX() local y = y or love.mouse.getY() self.getX = function() return x end self.getY = function() return y end self.setX = function(val) x = val end self.setY = function(val) Y = val end return self end [/code] Obviously I can do a [code] if fire then bullet = Bullet.new(x, y) end [/code] But how can I make more than 1 and be able to modify its position? I tried something like [code] bullets = {} for i = 0, 20 do bullets[i] = Bullet.new() end for i = 0, 20 do bullets[i].setX(500) end [/code] but that didn't seem to work :/ Any help? Thanks
• In fact, your code doesn't even make sense. Try this: [code] Bullet_mt = {} Bullet_mt.getX = function(self) return self.x end Bullet_mt.getY = function(self) return self.y end Bullet_mt.setX = function(self, x) self.x = x end Bullet_mt.setY = function(self, y) self.y = y end function NewBullet(x, y) local self = {} setmetatable(self, Bullet_mt) self.x = x or love.mouse.getX() self.y = y or love.mouse.getY() return self end [/code] Then you can use this syntactic sugar to invoke the functions: [code] local bullet = NewBullet(0, 0) -- x:y(z) is the same as y(x, z) bullet:setX(100) print bullet:getX() [/code]
• [QUOTE=BlkDucky;34163417]"love.mouse.love.mouse.getX()" what are you what[/QUOTE] Sorry, I started writing it out manually, then copy pasted it in forgetting to remove the first love.mouse. Its not like that in the code. [QUOTE=ROBO_DONUT;34163498]In fact, your code doesn't even make sense. Try this: [code] Bullet_mt = {} Bullet_mt.getX = function(self) return self.x end Bullet_mt.getY = function(self) return self.y end Bullet_mt.setX = function(self, x) self.x = x end Bullet_mt.setY = function(self, y) self.y = y end function NewBullet(x, y) local self = {} setmetatable(self, Bullet_mt) self.x = x or love.mouse.getX() self.y = y or love.mouse.getY() return self end [/code] Then you can use this syntactic sugar to invoke the functions: [code] local bullet = NewBullet(0, 0) -- x:y(z) is the same as y(x, z) bullet:setX(100) print bullet:getX() [/code][/QUOTE] Ok, thanks. But I still don't get how I'd go about using multiple bullets.
• [QUOTE=thetree;34163602]Ok, thanks. But I still don't get how I'd go about using multiple bullets.[/QUOTE] You're using them correctly, but it didn't work before because the class itself was broken.
• [QUOTE=ROBO_DONUT;34163684]You're using them correctly, but it didn't work before because the class itself was broken.[/QUOTE] Excellent, thank you very much, everything works now :)