m = peripheral.wrap("right")

m.setTextScale(1.5)


w, h = term.getSize()

repeat
m.setBackgroundColor(colors.lightGray)
m.clear()
m.setTextColor(colors.blue)
for y=1, h do
 for x=1, w do
  m.setCursorPos(x, y)
  m.write("=")
 end
end
 if tX and tY then
 m.setBackgroundColor(colors.lightBlue)
 m.setTextColor(colors.white)
 m.setCursorPos(tX, tY)
 m.write("=")
 end

event, side, tX, tY = os.pullEvent("monitor_touch")

 m.setBackgroundColor(colors.lightBlue)
 m.setTextColor(colors.white)

 m.setCursorPos(tX, tY)
 m.write("=")

sleep(0)
until nil