Comparison of drawing pacman character both in code and by using images.

main.lua

local x = 20

-- image code
local images = {}
local image
local quad
local t = 0
-- gen code
local PI_QUARTER = math.pi/4
local TWO_PI = 2*math.pi
local arc_start = PI_QUARTER
local arc_end = TWO_PI - PI_QUARTER
local animation_value = PI_QUARTER
local animation_state = 1

function love.load()
	love.window.setTitle('Pacman')
	love.window.setMode( 800, 150)
	-- image code
	images[1] = love.graphics.newImage('pacman1.png')
	images[2] = love.graphics.newImage('pacman2.png')
	images[3] = love.graphics.newImage('pacman3.png')
	quad = love.graphics.newQuad(0, 0, 20, 20, 20, 20)
	image = images[1]
end

function love.draw()
	-- image code
	love.graphics.draw(image, quad, x, 100)
	-- gen code
	love.graphics.setColor(unpack({255, 255, 0}))
	love.graphics.arc("fill", x + 10, 60, 10, arc_start-animation_value, arc_end+animation_value, 100)
end

function love.update(dt)
	-- image code
	t = t + dt * 6
	if t < 1 then
		image = images[1]
	elseif t < 2 then
		image = images[2]
	elseif t < 3 then
		image = images[3]
	elseif t < 4 then
		image = images[2]
	else
		t = 0
	end
	-- gen code
	arc_start = PI_QUARTER
	arc_end = TWO_PI - PI_QUARTER
	if animation_value >= PI_QUARTER then
		animation_state = 2
	elseif animation_value <= 0 then
		animation_state = 1
	end
	if animation_state == 1 then
		-- close mouth
		animation_value = animation_value + dt * 3
	elseif animation_state == 2 then
		-- open mouth
		animation_value = animation_value - dt * 3
	end
	x = x + 50 * dt
	if x > 800 then
		x = -20
	end	
end

pacman1.png

pacman2.png

pacman3.png

run.sh

rm pacman.love
zip -9 -q -r pacman.love main.lua  *.png
love pacman.love

Read the full related article here: https://masterex.github.io/archive/2020/07/18/signal-generation-by-using-mathematical-formulas.html