Animated Sprite Factory

Here you will find various resources to help you create games and apps in Gideros Studio.

note: You may have to provide your own assets (fonts, gfx, …).
note 2: You can copy/paste the code :-)

Description

This section deals with animating any of your sprites (player, enemies, collectibles, ...). It can be used either in conjunction with cbump, liquidfun(box2d) or as standalone.

Spritesheet Animations (player, enemies, collectibles, npcs, ...)

This is an example of how to animate using a spritesheet.

If you are using a class

Player = Core.class(Sprite)

function Player:init()
	-- spritesheet animations
	local spritesheettex = Texture.new("gfx/playable/mr_man.png")
	local cols, rows = 8, 6
	self.spritesheetimgs = {} -- table that will hold all the images in the sprite sheet
	self.anims = {} -- table that will hold all our animations ("idle", "run", ...)
	self.currentanim = ""
	self.frame = 0
	self.animspeed = 1 / 7
	self.animtimer = self.animspeed
	-- 1 retrieve all anims in spritesheet
	local w, h = spritesheettex:getWidth() / cols, spritesheettex:getHeight() / rows
	local spritesheettexregion = nil
	for r = 1, rows do
		for c = 1, cols do
			spritesheettexregion = TextureRegion.new(spritesheettex, (c - 1) * w, (r - 1) * h, w, h)
			self.spritesheetimgs[#self.spritesheetimgs + 1] = spritesheettexregion
		end
	end
	-- 2 create animations
	self:createAnim("idle", 1, 4)
	self:createAnim("run", 9, 14)
	self.currentanim = "run"
	-- 3 we can now create the player
	self.bitmap = Bitmap.new(self.spritesheetimgs[1])
	self.bitmap:setAnchorPoint(0.5, 0.5)
	self.bitmap:setScale(2)
	self:addChild(self.bitmap)
	-- LISTENERS
	self:addEventListener(Event.ENTER_FRAME, self.onEnterFrame, self)
end

-- PLAYER LOOP
function Player:onEnterFrame(e)
	-- animations
	if self.currentanim ~= "" then
		self.animtimer = self.animtimer - e.deltaTime
		if self.animtimer <= 0 then
			self.frame += 1
			self.animtimer = self.animspeed
			if self.frame > #self.anims[self.currentanim] then
				self.frame = 1
			end
			self.bitmap:setTextureRegion(self.anims[self.currentanim][self.frame])
		end
	end
	self.bitmap:setPosition(128, 64)
end

-- FUNCTIONS
function Player:createAnim(xanimname, xstart, xfinish)
	self.anims[xanimname] = {}
	for i = xstart, xfinish do
		self.anims[xanimname][#self.anims[xanimname] + 1] = self.spritesheetimgs[i]
	end
end

If you are not using a class

-- spritesheet animations
local spritesheettex = Texture.new("gfx/hero/HQ_Trooper_all.png") -- change accordingly
local cols, rows = 6, 13 -- change accordingly
local spritesheetimgs = {} -- table that will hold all the images in the sprite sheet
local anims = {} -- table that will hold all our animations ("idle", "run", ...)
local currentanim = ""
local frame = 0
local animspeed = 1 / 7 -- change accordingly
local animtimer = animspeed

-- 1 retrieve all anims in spritesheet
local w, h = spritesheettex:getWidth() / cols, spritesheettex:getHeight() / rows
local spritesheettexregion = nil
for r = 1, rows do
	for c = 1, cols do
		spritesheettexregion = TextureRegion.new(spritesheettex, (c - 1) * w, (r - 1) * h, w, h)
		spritesheetimgs[#spritesheetimgs + 1] = spritesheettexregion
	end
end

-- 2 create animations
function createAnim(xanimname, xstart, xfinish)
	anims[xanimname] = {}
	for i = xstart, xfinish do
		anims[xanimname][#anims[xanimname] + 1] = spritesheetimgs[i]
	end
end
createAnim("idle", 1, 2)
createAnim("run", 25, 30)

-- 3 we can now create the player
local bitmap = Bitmap.new(spritesheetimgs[1])
bitmap:setAnchorPoint(0.5, 0.5)
bitmap:setPosition(128, 64)
stage:addChild(bitmap)
currentanim = "idle"
--currentanim = "run"

-- GAME LOOP
function onEnterFrame(e)
	if currentanim ~= "" then
		animtimer = animtimer - e.deltaTime
		if animtimer <= 0 then
			frame += 1
			animtimer = animspeed
			if frame > #anims[currentanim] then
				frame = 1
			end
			bitmap:setTextureRegion(anims[currentanim][frame])
		end
	end
end
stage:addEventListener(Event.ENTER_FRAME, onEnterFrame)

In your game

Then all you need to do is create an instance of the player in your game class.

local myhero = Player.new()

Assets

You can pick the files from opengameart.org:

• https://opengameart.org/content/space-soldier-resize-64x64
• https://opengameart.org/content/pixel-coins-asset

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