main.lua

function love.load()
  debugging = false;
  if( love.window.setMode(500, 500, {}) ) then
    if debugging then print("Window size has been set.") end
    love.graphics.setPointSize(10);
  end
end

map = {}

function love.mousepressed(x, y, b)
  if(b == "l") then
    
  end
end

function love.update()
  if( love.mouse.isDown("l") ) then
    addRGBPoint(love.mouse.getX(), love.mouse.getY(), {math.random(0,100),math.random(0,100),math.random(0,100)})
  end
end

function addRGBPoint(x,y,rgb)
  assert(type(rgb) == "table", "rgb must be a table.");
  if not(map[x]) then map[x] = {} end
  map[x][y] = rgb
  if debugging then print(string.format("Adding point to %d,%d", x, y)) end
end

function love.draw()
    for xi,xv in pairs(map) do
      for yi,yv in pairs(xv) do
        love.graphics.setColor(yv[1],yv[2],yv[3])
        love.graphics.point(xi, yi);
        if debugging then print( string.format("Rendering points: %d, %d", xi, yi) ) end
      end
    end
end