Topic: The Internet has been very stale lately. (Read 1842 times)
Wait till the song B.DOUBLE O.T.Y comes out in both a rap and country version at the same time.
Collision is simple, assuming that your characters are rectangles here is a sample of my old code
Collision detection is simple (for simple shapes, anyway); it's collision response that's the hard part. 
For platform games, this depends on the type of objects that collided.
The simplest case is, of course, a bullet. A colliding bullet simply disappears and causes damage to whatever it collided with.
Enemy vs. player collisions are more complicated, since unless the player is a one hit-point wonder, both objects will still be around and still be intersecting unless you do something about it. Depending on the game, you may or may not want enemies to be solid (see below), and in either case, if the collision itself causes damage (as opposed to the more realistic case of requiring one actor to actually perform an attack in order to damage the other), then you need knockback and/or mercy invincibility to avoid repeating the damage on every frame.
Finally comes the platforms themselves (as well as anything else that functions as a solid platform). Here, it's important to know which direction the collision came from (whether you walked into a wall, bumped your head on the ceiling, or are standing on the floor). For square actors, this can be accomplished by checking which axis (X or Y) has the greatest absolute difference between the distance and the sum of the sizes of the actors (ie, how deeply they're interpenetrating) (for rectangular actors, you also need to take into account the actors' aspect ratio). The sign of the difference tells you the direction. Then it's just a simple matter for zeroing the moving actor's velocity in that axis, and clipping its position to the plane of the platform. For the special case of collisions from above (standing on the floor), you also want to set a flag saying that the actor is standing on a floor, so you can set appropriate animation, etc.
Note that all of the above only applies if no object can move fast enough to reach the other side of another within a single frame (mostly a problem for bullets, but can affect falling players if they have no terminal velocity). In that case, it gets even more complicated.
Old school!
Now that's a real smoothie! New avatar anyone?
If you think the Internet is stale, you haven't been to leekspin.com recently 
Ty! I forgot about this site i find it funny, time to bookmark and hypnotise myself! 
http://leekspin.com/
For link purposes.
If you think the Internet is stale, you haven't been to leekspin.com recently
Stop with this useless code.
Quote from: Remember remember the 5th of November
Those are just semantics, I write clean code, if you see how the MyBB team code it's just gorgeous.
[/quote
Those are just semantics, I write clean code, if you see how the MyBB team code it's just gorgeous.
[/quote
No, I haven't seen. Are you claiming your code is gorgeous?
Quote
Plus
if(eval)
{
// code
}
is much better than
if(eval) {
// code
}
if(eval)
{
// code
}
is much better than
if(eval) {
// code
}
It's much better? One of the reasons for putting the opening curly on the same line is to show a little more code per page, decreasing scrolling for comprehension. Note that I'm not using the word 'better'. I'm stating a reason for a preference.
Whitespace is good, and necessary, but not in this case.
legendary
Activity: 1862
Merit: 1011
Reverse engineer from time to time
Code:
bool check_collision_rect(Rect *A, Rect *B)
{
// The sides of the rectangles
int leftA, leftB;
int rightA, rightB;
int topA, topB;
int bottomA, bottomB;
// Calculate the sides of rect A
leftA = A->x;
rightA = A->x + A->w;
topA = A->y;
bottomA = A->y + A->h;
// Calculate the sides of rect B
leftB = B->x;
rightB = B->x + B->w;
topB = B->y;
bottomB = B->y + B->h;
// If any of the sides from A are outside of B
if(bottomA <= topB) {
return false;
}
if(topA >= bottomB) {
return false;
}
if(rightA <= leftB) {
return false;
}
if(leftA >= rightB) {
return false;
}
// If none of the sides from A are outside B
return true;
}
and
Code:
double distance(int x1, int y1, int x2, int y2)
{
// Return the distance between the two points
return sqrt(pow(x2 - x1, 2) + pow( y2 - y1, 2));
}
bool collision_circle(Circle A, Circle B)
{
// If the distance between the centers of the circles is
// less than the sum of their radii
if(distance(A.x, A.y, B.x, B.y) < (A.r + B.r)) {
//The circles have collided
return true;
}
// If not
return false;
}
Fixed your code. Issues included no spaces between comments and double slashes, failure to put opening curly bracket for if/else/for/while constructs on same line as opening statement, failure to align assignment operator for variables belonging to a group, and excess spacing around parenthesis.
Plus
if(eval)
{
// code
}
is much better than
if(eval) {
// code
}
9gag and 4chan.
Old school!
He did say it was old code you know 
Code:
bool check_collision_rect(Rect *A, Rect *B)
{
// The sides of the rectangles
int leftA, leftB;
int rightA, rightB;
int topA, topB;
int bottomA, bottomB;
// Calculate the sides of rect A
leftA = A->x;
rightA = A->x + A->w;
topA = A->y;
bottomA = A->y + A->h;
// Calculate the sides of rect B
leftB = B->x;
rightB = B->x + B->w;
topB = B->y;
bottomB = B->y + B->h;
// If any of the sides from A are outside of B
if(bottomA <= topB) {
return false;
}
if(topA >= bottomB) {
return false;
}
if(rightA <= leftB) {
return false;
}
if(leftA >= rightB) {
return false;
}
// If none of the sides from A are outside B
return true;
}
and
Code:
double distance(int x1, int y1, int x2, int y2)
{
// Return the distance between the two points
return sqrt(pow(x2 - x1, 2) + pow( y2 - y1, 2));
}
bool collision_circle(Circle A, Circle B)
{
// If the distance between the centers of the circles is
// less than the sum of their radii
if(distance(A.x, A.y, B.x, B.y) < (A.r + B.r)) {
//The circles have collided
return true;
}
// If not
return false;
}
Fixed your code. Issues included no spaces between comments and double slashes, failure to put opening curly bracket for if/else/for/while constructs on same line as opening statement, failure to align assignment operator for variables belonging to a group, and excess spacing around parenthesis.
I'm using SFML myself so the code is already there, I just need to implement it all into my game properly which is harder than it looks!
legendary
Activity: 1862
Merit: 1011
Reverse engineer from time to time
Collision is simple, assuming that your characters are rectangles here is a sample of my old code
and
Looks like space invaders + mario
Yeah, I was inspired by mario. At first I was going to make so you could walk up,down,left,right but then decided to make it like Super Mario from 84 for SNES.
Code:
bool check_collision_rect(Rect *A, Rect *B)
{
//The sides of the rectangles
int leftA, leftB;
int rightA, rightB;
int topA, topB;
int bottomA, bottomB;
//Calculate the sides of rect A
leftA = A->x;
rightA = A->x + A->w;
topA = A->y;
bottomA = A->y + A->h;
//Calculate the sides of rect B
leftB = B->x;
rightB = B->x + B->w;
topB = B->y;
bottomB = B->y + B->h;
//If any of the sides from A are outside of B
if(bottomA <= topB)
{
return false;
}
if(topA >= bottomB)
{
return false;
}
if(rightA <= leftB)
{
return false;
}
if(leftA >= rightB)
{
return false;
}
//If none of the sides from A are outside B
return true;
}
and
Code:
double distance(int x1, int y1, int x2, int y2)
{
//Return the distance between the two points
return sqrt( pow( x2 - x1, 2 ) + pow( y2 - y1, 2 ) );
}
bool collision_circle(Circle A, Circle B)
{
//If the distance between the centers of the circles is less than the sum of their radii
if(distance(A.x, A.y, B.x, B.y) < (A.r + B.r))
{
//The circles have collided
return true;
}
//If not
return false;
}
It's true actually 
the internet isn't being as original as it used to be, maybe everyones working on news stuff or something, i need to hurry up and finish learning the coding I need so I can make some fun games to play and not be bored anymore lololool
Already ahead of you the internet isn't being as original as it used to be, maybe everyones working on news stuff or something, i need to hurry up and finish learning the coding I need so I can make some fun games to play and not be bored anymore lololool Looks like space invaders + mario
The Internet is so 90's...
I know we just hijacked this thread but what the hell maybe we should make a thread just to show off our WIP games , so far I've managed to make my rabbit thingy move across the screen, need to fix FPS and add collision in for it to properly work and of course put in some gravity.
The idea is it's a basic platformer and you play as a rabbit that has to jump up clouds to the moon, the stars are either powerups or bad guys depending on their emotions
maybe we should make a thread just to show off our WIP games , so far I've managed to make my rabbit thingy move across the screen, need to fix FPS and add collision in for it to properly work and of course put in some gravity.
The idea is it's a basic platformer and you play as a rabbit that has to jump up clouds to the moon, the stars are either powerups or bad guys depending on their emotions
It's true actually the internet isn't being as original as it used to be, maybe everyones working on news stuff or something, i need to hurry up and finish learning the coding I need so I can make some fun games to play and not be bored anymore lololool
Already ahead of you the internet isn't being as original as it used to be, maybe everyones working on news stuff or something, i need to hurry up and finish learning the coding I need so I can make some fun games to play and not be bored anymore lololool 
Looks like space invaders + mario
Hah! Bet you're not fixing the FPS issues yet
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