More extreme editing, replacing the confusing variable naming with clear variable names and intuitive structures, to help people to answer the original question (rather than becoming confused by the specific coding style)

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edited Jan 26, 2012 at 2:37

Trevor Powell

21.5k
1
63
96

What do I do after the bounding box test against a tile to see ifdetermine whether there is a real collision against the contents of that tile? And if there is, how should I move the object in response to that collision?

I have a small object, and test for collisions against the tiles that each corner of it is on.

Here's my current code, which I run for each of those (up to) four tiles:

// i have a small object.. i test it vsget the 4 tiles that eachbounding cornerbox of it is 
// on to see ifthe thereobject, isin aworld collision...space
// _1x1 and _1y1 andobjectBounds so= onobject->bounds are+ setobject->position; to the
if Object( 1(objectBounds.right x>= andtileBounds.left) y&& coordinates
// _2x1[i] and _2y1[i] and so on are set(objectBounds.left to<= thetileBounds.right) Tiles&& coordinates
if ((_1x2 >= _2x1[i]) && (_1x1objectBounds.top <=>= _2x2[i]tileBounds.bottom) && 
    (_1y2 >= _2y1[i]) && (_1y1objectBounds.bottom <= _2y2[i]tileBounds.top))
{
    // perform specific test to see if it's a left, top , bottom 
    // or right collision. If so, I check to see the nature of it 
    // and where I need to place the object... [this isto therespond partto that collision... 
    // needs[THIS work]IS THE PART THAT NEEDS WORK]
    //
    if(lastkey==keydown[right]&& lastkey==keydown[right] && ((_1x2objectBounds.right >= _2x1[i]tileBounds.left) && 
                                   (_1x2objectBounds.right <= _2x2[i]tileBounds.right) && 
                                   (_1y1objectBounds.bottom >= _2y1[i]tileBounds.bottom) && (_1y1 
 <= _2y2[i])))
    {
        currentobject1_ptr->xpos = _2x1[i]-(currentobject1_ptr->boundingmap ->width );
        gamechar_x =newgc1= currentobject1_ptr->xpos - -mapooffset_x;
     (objectBounds.bottom <= tileBounds.top)) gamechar_y)
 = newgamechar_y = oldgamechar_y;{
        rightstopobject->position.x = =1;tileBounds.left - objectBounds.width;
    }
    // etc.

What do I do after the bounding box test against a tile to see if there is a real collision against the contents of that tile?

Here's my current code:

// i have a small object.. i test it vs the 4 tiles that each corner of it is 
// on to see if there is a collision...
// _1x1 and _1y1 and so on are set to the Object 1 x and y coordinates
// _2x1[i] and _2y1[i] and so on are set to the Tiles coordinates
if ((_1x2 >= _2x1[i]) && (_1x1 <= _2x2[i]) && 
    (_1y2 >= _2y1[i]) && (_1y1 <= _2y2[i]))
{
    // perform specific test to see if it's a left, top , bottom 
    // or right collision. If so, I check to see the nature of it 
    // and where I need to place the object... [this is the part that 
    // needs work]
    //
    if(lastkey==keydown[right]&&((_1x2 >= _2x1[i]) && (_1x2 <= _2x2[i]) && 
                                (_1y1 >= _2y1[i]) && (_1y1 <= _2y2[i])))
    {
        currentobject1_ptr->xpos = _2x1[i]-(currentobject1_ptr->boundingmap ->width );
        gamechar_x =newgc1= currentobject1_ptr->xpos - -mapooffset_x;
        gamechar_y = newgamechar_y = oldgamechar_y;
        rightstop  =1;
    }

What do I do after the bounding box test against a tile to determine whether there is a real collision against the contents of that tile? And if there is, how should I move the object in response to that collision?

I have a small object, and test for collisions against the tiles that each corner of it is on.

Here's my current code, which I run for each of those (up to) four tiles:

// get the bounding box of the object, in world space
objectBounds = object->bounds + object->position;  
if ( (objectBounds.right >= tileBounds.left) && 
     (objectBounds.left <= tileBounds.right) && 
     (objectBounds.top >= tileBounds.bottom) && 
     (objectBounds.bottom <= tileBounds.top))
{
    // perform specific test to see if it's a left, top , bottom 
    // or right collision. If so, I check to see the nature of it 
    // and where I need to place the object to respond to that collision... 
    // [THIS IS THE PART THAT NEEDS WORK]
    //
    if( lastkey==keydown[right] && ((objectBounds.right >= tileBounds.left) && 
                                   (objectBounds.right <= tileBounds.right) && 
                                   (objectBounds.bottom >= tileBounds.bottom) &&  
                                   (objectBounds.bottom <= tileBounds.top)) )
    {
        object->position.x = tileBounds.left - objectBounds.width;
    }
    // etc.

More editing to try to turn this into a meaningful and salvagable question, including reformatting the code to look less painful. (Didn't change variable naming, although I dearly would have love to have done that as well)

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edited Jan 26, 2012 at 2:18

Trevor Powell

21.5k
1
63
96

What do I do after the bounding box test against a tile to see if there is any kind ofa real collision at all? How do I test for specific collisions afteragainst the contents of that tile?

Here's my current code:

// i have a small object.. i test it vs the 4 tiles that each corner of it is 
// on to see if //there is a collision...
// _1x1 and _1y1 and so on are set to the Object 1 x and y coordinates
//2x1[i] _2x1[i] and _2y1[i] and so on are set to the Tiles coordinates
if ((_1x2 >= _2x1[i]) && (_1x1 <= _2x2[i]) && 
    (_1y2 >= _2y1[i]) && (_1y1 <= _2y2[i]))
{
    // perform specific test to see if it'sait's a left, top , bottom or 
 right collision
  //then ifor thereright iscollision. oneIf iso, I check to see the nature of it 
    // and where iI need to place the object... this[this is the part needsthat work 
 and then it all// worksneeds perfect,work]
 thanks please help
 //
    if(lastkey==keydown[right]&&((_1x2 >= _2x1[i]) && (_1x2 <= _2x2[i]) && 
                                (_1y1 >= _2y1[i]) && (_1y1 <= _2y2[i])))
    {
        currentobject1_ptr->xpos = _2x1[i]-(currentobject1_ptr->boundingmap ->width );
        gamechar_x =newgc1= currentobject1_ptr->xpos - -mapooffset_x;
        gamechar_y = newgamechar_y = oldgamechar_y;
        rightstop  =1;
    }

What do I do after the bounding box test against a tile to see if there is any kind of collision at all? How do I test for specific collisions after that? Here's my current code:

//i have a small object.. i test it vs the 4 tiles that each corner of it is on to see if //there is a collision...
//_1x1 and so on are set to the Object 1 coordinates
//2x1[i] and so on are set to the Tiles coordinates
if ((_1x2 >= _2x1[i]) && (_1x1 <= _2x2[i]) && (_1y2 >= _2y1[i]) && (_1y1 <= _2y2[i]))
{
//perform specific test to see if it'sa  left, top , bottom or right collision
//then if there is one i check to see the nature of it and where i need to place the object... this part needs work and then it all works perfect, thanks please help
//
 if(lastkey==keydown[right]&&((_1x2 >= _2x1[i]) && (_1x2 <= _2x2[i]) && (_1y1 >= _2y1[i]) && (_1y1 <= _2y2[i])))
{
   currentobject1_ptr->xpos = _2x1[i]-(currentobject1_ptr->boundingmap ->width );
   gamechar_x =newgc1= currentobject1_ptr->xpos - -mapooffset_x;
   gamechar_y = newgamechar_y = oldgamechar_y;
   rightstop  =1;
}

What do I do after the bounding box test against a tile to see if there is a real collision against the contents of that tile?

Here's my current code:

// i have a small object.. i test it vs the 4 tiles that each corner of it is 
// on to see if there is a collision...
// _1x1 and _1y1 and so on are set to the Object 1 x and y coordinates
// _2x1[i] and _2y1[i] and so on are set to the Tiles coordinates
if ((_1x2 >= _2x1[i]) && (_1x1 <= _2x2[i]) && 
    (_1y2 >= _2y1[i]) && (_1y1 <= _2y2[i]))
{
    // perform specific test to see if it's a left, top , bottom  
    // or right collision. If so, I check to see the nature of it 
    // and where I need to place the object... [this is the part that  
    // needs work]
    //
    if(lastkey==keydown[right]&&((_1x2 >= _2x1[i]) && (_1x2 <= _2x2[i]) && 
                                (_1y1 >= _2y1[i]) && (_1y1 <= _2y2[i])))
    {
        currentobject1_ptr->xpos = _2x1[i]-(currentobject1_ptr->boundingmap ->width );
        gamechar_x =newgc1= currentobject1_ptr->xpos - -mapooffset_x;
        gamechar_y = newgamechar_y = oldgamechar_y;
        rightstop  =1;
    }

deleted 195 characters in body; edited title

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edited Jan 25, 2012 at 19:08

user1430

2d game object VS 2d How do I handle specific tile colision/object collisions?

whatWhat do iI do after the bounding box test against a tile to see if there is any kind of collision at all.. how? How do iI test for specific collisions after that...? Here's my current sample code provided:

//i have a small object.. i test it vs the 4 tiles that each corner of it is on to see if //there is a collision...
//_1x1 and so on are set to the Object 1 coordinates
//2x1[i] and so on are set to the Tiles coordinates
if ((_1x2 >= _2x1[i]) && (_1x1 <= _2x2[i]) && (_1y2 >= _2y1[i]) && (_1y1 <= _2y2[i]))
{
//perform specific test to see if it'sa  left, top , bottom or right collision
//then if there is one i check to see the nature of it and where i need to place the object... this part needs work and then it all works perfect, thanks please help
//
 if(lastkey==keydown[right]&&((_1x2 >= _2x1[i]) && (_1x2 <= _2x2[i]) && (_1y1 >= _2y1[i]) && (_1y1 <= _2y2[i])))
{
   currentobject1_ptr->xpos = _2x1[i]-(currentobject1_ptr->boundingmap ->width );
   gamechar_x =newgc1= currentobject1_ptr->xpos - -mapooffset_x;
   gamechar_y = newgamechar_y = oldgamechar_y;
   rightstop  =1;
}

thanks.. please email solution to [email protected] with "2D collision" in the title... i get lots of junk mail so please put "2d collision" in the title so that i can get it ;P

2d game object VS 2d tile colision

what do i do after the bounding box test against a tile to see if there is any kind of collision at all.. how do i test for specific collisions after that... current sample code provided

//i have a small object.. i test it vs the 4 tiles that each corner of it is on to see if //there is a collision...
//_1x1 and so on are set to the Object 1 coordinates
//2x1[i] and so on are set to the Tiles coordinates
if ((_1x2 >= _2x1[i]) && (_1x1 <= _2x2[i]) && (_1y2 >= _2y1[i]) && (_1y1 <= _2y2[i]))
{
//perform specific test to see if it'sa  left, top , bottom or right collision
//then if there is one i check to see the nature of it and where i need to place the object... this part needs work and then it all works perfect, thanks please help
//
 if(lastkey==keydown[right]&&((_1x2 >= _2x1[i]) && (_1x2 <= _2x2[i]) && (_1y1 >= _2y1[i]) && (_1y1 <= _2y2[i])))
{
   currentobject1_ptr->xpos = _2x1[i]-(currentobject1_ptr->boundingmap ->width );
   gamechar_x =newgc1= currentobject1_ptr->xpos - -mapooffset_x;
   gamechar_y = newgamechar_y = oldgamechar_y;
   rightstop  =1;
}

thanks.. please email solution to [email protected] with "2D collision" in the title... i get lots of junk mail so please put "2d collision" in the title so that i can get it ;P

How do I handle specific tile/object collisions?

What do I do after the bounding box test against a tile to see if there is any kind of collision at all? How do I test for specific collisions after that? Here's my current code:

//i have a small object.. i test it vs the 4 tiles that each corner of it is on to see if //there is a collision...
//_1x1 and so on are set to the Object 1 coordinates
//2x1[i] and so on are set to the Tiles coordinates
if ((_1x2 >= _2x1[i]) && (_1x1 <= _2x2[i]) && (_1y2 >= _2y1[i]) && (_1y1 <= _2y2[i]))
{
//perform specific test to see if it'sa  left, top , bottom or right collision
//then if there is one i check to see the nature of it and where i need to place the object... this part needs work and then it all works perfect, thanks please help
//
 if(lastkey==keydown[right]&&((_1x2 >= _2x1[i]) && (_1x2 <= _2x2[i]) && (_1y1 >= _2y1[i]) && (_1y1 <= _2y2[i])))
{
   currentobject1_ptr->xpos = _2x1[i]-(currentobject1_ptr->boundingmap ->width );
   gamechar_x =newgc1= currentobject1_ptr->xpos - -mapooffset_x;
   gamechar_y = newgamechar_y = oldgamechar_y;
   rightstop  =1;
}