[SDL] "Eww" effect

[cboard_member]

So I've decided to implement a message-based system to things in my engine - this includes rendering. Bascially the engine will send a message to the player once every iteration of the game loop to tell him to redraw himself at a given X,Y co-ord.

T'all works well except the sprite leaves nasty trails behind it when it moves. I tried to SDL_FillRect() the background every frame but that didn't work - it all just went blank.

I haven't used SDL very much so is there something else I'm supposed to be doing?

EDIT: Oh and if you're wondering, I've decided to clone that good ol' Net Yaroze version of Rocks 'n' Gems as my first game. And that sprite was 4 red dots until I moved it.

EDIT2: I looked at SDL_UpdateRect(), made no difference.

[Quantum1024]

Are you sure your player is receiving only one Draw event each iteration?

[prog-bman]

Are you using double buffering? Cause if so you draw to the second buffer, blit it to the screen, clear it and then re-draw it rinse and repeat.

[cboard_member]

Cheers prog-bman. I just realised I had initialised SDL without SDL_DOUBLEBUF, so I just switched on double buffering and cleared after each SDL_Flip and it works.

[prog-bman]

Your welcome, even though I do the allegro thingy I did dabble in SDL .