Comments on: SDL Per Pixel Collision http://www.sdltutorials.com/sdl-per-pixel-collision/ SDL Tutorials - Game Tutorials - Programming Tutorials Wed, 28 Jul 2010 14:45:55 +0000 hourly 1 http://wordpress.org/?v=3.0 By: Jason Norris http://www.sdltutorials.com/sdl-per-pixel-collision/comment-page-1/#comment-9530 Jason Norris Thu, 15 Jul 2010 16:48:13 +0000 http://www.sdltutorials.com/?p=213#comment-9530 SDL_PollEvent works like a queue and will return NULL when no items are left in the queue. If you use it in an if-statement, it will only pull the first event in the queue. If you use a while-loop, it will continue until the queue has been entirely emptied. SDL_PollEvent works like a queue and will return NULL when no items are left in the queue. If you use it in an if-statement, it will only pull the first event in the queue. If you use a while-loop, it will continue until the queue has been entirely emptied.

]]> By: Jan http://www.sdltutorials.com/sdl-per-pixel-collision/comment-page-1/#comment-9495 Jan Wed, 14 Jul 2010 12:11:04 +0000 http://www.sdltutorials.com/?p=213#comment-9495 Hello! Wonderful tutorial! But I think, we should have: void Game::OnThink() { if(SDL_PollEvent(&event)) { instead of: void Game::OnThink() { while(SDL_PollEvent(&event)) Hello!
Wonderful tutorial!

But I think, we should have:

void Game::OnThink()
{
if(SDL_PollEvent(&event))
{

instead of:

void Game::OnThink()
{
while(SDL_PollEvent(&event))

]]> By: Jason Norris http://www.sdltutorials.com/sdl-per-pixel-collision/comment-page-1/#comment-6807 Jason Norris Mon, 22 Feb 2010 16:38:54 +0000 http://www.sdltutorials.com/?p=213#comment-6807 Thank you for catching that, Erik. For those of you not seeing why this is a problem, this could cause the SDL_Surface's pixel array to go out of bounds in the GetAlphaXY function, resulting in a crash. The changes have now been made. :) Thank you for catching that, Erik. For those of you not seeing why this is a problem, this could cause the SDL_Surface’s pixel array to go out of bounds in the GetAlphaXY function, resulting in a crash. The changes have now been made. :)

]]> By: Erik http://www.sdltutorials.com/sdl-per-pixel-collision/comment-page-1/#comment-6802 Erik Mon, 22 Feb 2010 03:22:08 +0000 http://www.sdltutorials.com/?p=213#comment-6802 found a bug in bool Entity::CheckCollision(Entity* entityA, Entity* entityB) THIS for(int y = 0; y <= collisionRect.h; y++) for(int x = 0; x <= collisionRect.w; x++) SHOULD BE for(int y = 0; y <collisionRect.h; y++) for(int x = 0; x < collisionRect.w; x++) very good tutorial though one of the best i've come across! found a bug in
bool Entity::CheckCollision(Entity* entityA, Entity* entityB)

THIS
for(int y = 0; y <= collisionRect.h; y++)
for(int x = 0; x <= collisionRect.w; x++)

SHOULD BE
for(int y = 0; y <collisionRect.h; y++)
for(int x = 0; x < collisionRect.w; x++)

very good tutorial though one of the best i've come across!

]]> By: NordCoder http://www.sdltutorials.com/sdl-per-pixel-collision/comment-page-1/#comment-6407 NordCoder Wed, 03 Feb 2010 19:02:19 +0000 http://www.sdltutorials.com/?p=213#comment-6407 Very nice tutorial with good explanations. The red/green box feature is a nice visual touch. Keep up the good work :) Very nice tutorial with good explanations. The red/green box feature is a nice visual touch. Keep up the good work :)

]]> By: Leonardo http://www.sdltutorials.com/sdl-per-pixel-collision/comment-page-1/#comment-6396 Leonardo Tue, 02 Feb 2010 15:07:15 +0000 http://www.sdltutorials.com/?p=213#comment-6396 Good tutorials on pixel perfect collision with SDL are hard to find out there, thank you for this one. It is clear and very well written. The code is very easy to follow. Good tutorials on pixel perfect collision with SDL are hard to find out there, thank you for this one. It is clear and very well written. The code is very easy to follow.

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