create a draw screen independent of resolution

Hi, i want to create a draw screen like the one in https://play.google.com/store/apps/details?id=com.inthegame.brainon&hl=en or like this: https://play.google.com/store/apps/details?id=com.orbital.brainiton&hl=en and it should be independent of resolution and the game is in landscape mode .i just need to create a draw screen to draw shapes on. how to draw shapes that's different question