local gpu = require("component").gpu
local function createFunction(x1, y1, x2, y2)
  local slope = (y1-y2)/(x1-x2)
  local b = y1 - (slope*x1)
  local function f(x)
    return slope*x+b
  end
  return f
end

local function drawLine(x1, y1, x2, y2)
  f = createFunction(x1, y1, x2, y2)
  for x = x1, x2, 0.1 do
    gpu.set(x, f(x), "X")
  end
end