draw.lua

local LM = require("includes.lovemachine")

--https://love2d.org/forums/viewtopic.php?t=80746
-- Returns canvas of given width and height containing a circle
function initCanvas(size, color)
	local c = love.graphics.newCanvas(size, size)
	love.graphics.setCanvas(c) -- Switch to drawing on canvas 'c'
	--love.graphics.setLineWidth for circle thickness
	love.graphics.setBlendMode("alpha")
	love.graphics.setColor(color:get())
	love.graphics.circle("line", size / 2, size / 2, size / 2.2, 100)
	love.graphics.setCanvas() -- Switch back to drawing on main screen
	return c
end

--function to create a pulse
--could probably calculate the particle count in an intelligent way...
function createPulse(startSize, color, frequency, duration, endscale)
	local img = initCanvas(startSize, color)

		--[[local pulse = {
		{LM.Components.particle, img, --image
		frequency * duration, -- count
		duration--[ lifetime]] , frequency, false, --rate, once
		{ 0, 0, 0, 0 }, 0, { 0, 0 }, { 0, 0 }, 0, --acceleration, speed, rotation, spin
		{ 1, endscale }, 0 --[[scale} --sizes, size variation
	}]]

	return LM.Components.particle(img, frequency * duration,
		duration, frequency, false, { 0, 0, 0, 0 }, 0, { 0, 0 }, { 0, 0 }, 0,
		{ 1, endscale }, 0, true)
end

function createStockParticleSystem(imgPath)
	return LM.Components.particle(initCanvas(32, Color.new(1, 1, 1, 1)),
		32, 5, 5, false, { 0, 0, 0, 0 }, 0, { 0, 0 }, { 0, 0 }, 0,
		{ 1, 2 }, 0, true)
end

-- DEBUG HELPERS

function DrawGridFilled(x, y, cellSize)
	for i = 0, x, cellSize do
		for j = 0, y, cellSize do
			love.graphics.rectangle("fill", i, j, cellSize, cellSize)
		end
	end
end

function DrawGridLines(sX, sY, eX, eY, cellSize)
	for i = sX, eX, cellSize do
		love.graphics.line(i, 0, i, eY)
	end

	for j = sY, eY, cellSize do
		love.graphics.line(0, j, eX, j)
	end
end

function DrawArrows(x, y, cellSize)
	local arrowSize = cellSize / 2
	for i = 0, x, cellSize do
		for j = 0, y, cellSize do
			-- Draw the arrow
			love.graphics.push()
			love.graphics.translate(i + cellSize / 2, j + cellSize / 2)
			love.graphics.rotate(math.pi / 4)
			love.graphics.polygon("fill", arrowSize / 2, 0, -arrowSize / 2, -arrowSize / 2, -arrowSize / 2, arrowSize / 2)
			love.graphics.pop()
		end
	end
end

-- Function to create the canvas
function CreateGridCanvas(width, height, cellSize)
	local canvas = love.graphics.newCanvas(width, height)
	love.graphics.setCanvas(canvas)
	love.graphics.setColor(255, 255, 255, 1)
	-- Reset the color to white
	DrawGridLines(0, 0, width, height, cellSize)
	love.graphics.setColor(255, 255, 255)

	love.graphics.setCanvas()

	return canvas
end