#include "U8glib.h"

U8GLIB_SSD1306_128X64 u8g();

int cameraX = 0;
int cameraY = 0;
int cameraZ = 0;

void setup()
{
  u8g.setFont(u8g_font_tpssb);
  u8g.setColorIndex(1);
}

void loop()
{
  int position[2] = {goToGetX(0, 0, 0), goToGetY(0, 0, 0)};
  int position2[2] = {goToGetX(0, 1, 0), goToGetY(0, 1, 0)};

  u8g.firstPage();

  do
  {
    u8g.drawStr(0, 16, "hello world");
    u8g.drawLine(position[0], position[1], position2[0], position2[1]);
  }
  while ( u8g.nextPage() );
}

int goToGetX(int x, int y, int z)
{
  return (x - cameraX) / (z - cameraZ);
}

int goToGetY(int x, int y, int z)
{
  return (y - cameraY) / (z - cameraZ);
}