View difference between Paste ID: f1fGnKwm and LErbin5K

 function lerp(a, b, t)
     return a + (b-a)*t
 end
 
 width, height = term.getSize()
 midw = math.floor(width/2)
 midh = math.floor(height/2)
 
 p0 = vector.new(1, 1, 0)
 p2 = vector.new(width, height, 0)
 
 function quad_bezier(p0, p1, p2, step)
 
     local oldx = p0.x
     local oldy = p0.y
 
     for t=0, 1, step do
         local x1 = lerp(p0.x, p1.x, t)
         local y1 = lerp(p0.y, p1.y, t)
         local x2 = lerp(p1.x, p2.x, t)
         local y2 = lerp(p1.y, p2.y, t)
         local x = lerp(x1, x2, t)
         local y = lerp(y1, y2, t)
 
         paintutils.drawLine(oldx, oldy, x, y, colors.white)
 
         oldx = x
         oldy = y
     end
 end
 
 while true do
     local p1 = vector.new(1, height, 0)
     local event, button, x, y = os.pullEvent("mouse_drag")
     term.setBackgroundColor(colors.black)
     term.clear()
     p1.x, p1.y = x, y
     quad_bezier(p0, p1, p2, 0.2)
 end
 
 -- paintutils.drawLine(p0.x, p0.y, p1.x, p1.y, colors.white)