love.graphics.rectangle('fill', vx(Save_viewport.x), vy(Save_viewport.y), scale(Save_viewport.w/Save_viewport.zoom), scale(Save_viewport.h/Save_viewport.zoom))

		love.graphics.rectangle('fill', vx(Save_viewport.x), vy(Save_viewport.y),
			-- iscale by Save_viewport, then scale by Viewport
			scale(Save_viewport.w/Save_viewport.zoom), scale(Save_viewport.h/Save_viewport.zoom))

Viewport = {x=-50, y=-50, w=800,h=600, zoom=1.0}

Viewport = {
	x=-50, y=-50,  -- surface coordinate
	w=800, h=600,  -- viewport distances
	zoom=1.0
}