//-------------------------------------------------------------
//check collision of an dynamic object with another object
//return CollisionDirection of 2nd object
//-------------------------------------------------------------
eCollisionDirection PlayMap::CheckCollision(GameObject *targetObj, GameObject *unknownObj, float &offsetX, float &offsetY)
{
float normalX, normalY;
float moveX, moveY;
Box dynamicBox = targetObj->GetBoundaryBox();
Box unknownBox = unknownObj->GetBoundaryBox();
//neu chua va cham
if (AABB(dynamicBox, unknownBox, moveX, moveY, offsetX, offsetY) == false)
{
if (targetObj->IsDynamic())
{
DynamicGameObject* dynamicObj = (DynamicGameObject*)targetObj;
//neu unknownObj co van toc thi tru van toc 2 vat
if (unknownObj->IsDynamic())
{
dynamicBox.fVx -= unknownBox.fVx;
dynamicBox.fVy -= unknownBox.fVy;
unknownBox.fVx = 0.0f;
unknownBox.fVy = 0.0f;
}
//lay vung khong gian cua vat 1
Box broadphasebox = getSweptBroadphaseBox(dynamicBox);
//neu vat 2 nam trong vung khong gian cua vat 1
if (AABB(broadphasebox, unknownBox, moveX, moveY, offsetX, offsetY) == true)
{
//su dung thuat toan sweptAABB de xac dinh va cham
float collisiontime = sweptAABB(dynamicBox, unknownBox, normalX, normalY);
//truong hop co xay ra va cham
if (collisiontime > 0.0f && collisiontime < 1.0f)
{
//normalY != 0.0f va moveY != 0 tuc va cham theo phuong doc
if (normalY != 0.0f && moveY != 0)
{
//va cham top, truong hop moveY <= 0 thi khong tinh va cham
if (normalY == 1.0f && moveY > 0)
{
return eCollisionDirection::eTop;
}
//va cham bot, truong hop moveY >= 0 thi khong tinh va cham
else if (normalY == -1.0f && moveY < 0)
{
return eCollisionDirection::eBottom;
}
}
//normalX != 0.0f va moveX != 0 tuc va cham theo phuong ngang
else if (normalX != 0.0f && moveX != 0.0f)
{
//va cham right, truong hop moveX >= 0 thi khong tinh va cham
if (normalX == 1.0f && moveX < 0)
{
return eCollisionDirection::eRight;
}
//va cham left, truong hop moveX <= 0 thi khong tinh va cham
else if (normalX == -1.0f && moveX > 0)
{
return eCollisionDirection::eLeft;
}
}
}
}
}
}
//neu da va cham
else
{
//va cham theo phuong doc
if (moveY != 0)
{
//top
if (moveY > 0.0f)
{
return eCollisionDirection::eTop;
}
//bot
else
{
return eCollisionDirection::eBottom;
}
}
//va cham theo phuong ngang
else if (moveX != 0)
{
//left
if (moveX < 0.0f)
{
return eCollisionDirection::eLeft;
}
//right
else
{
return eCollisionDirection::eRight;
}
}
//moveX == 0 va move Y == 0 tuc 2 vat dang tiep xuc
else
{
//truong hop goc cham goc thi khong xac dinh duoc huong va cham
//top left dynamicbox collide with bot right unknownbox
if ((dynamicBox.fY == unknownBox.fY - unknownBox.fHeight && dynamicBox.fX == unknownBox.fX + unknownBox.fWidth)
//top right dynamicbox collide with bot left unknownbox
|| (dynamicBox.fY == unknownBox.fY - unknownBox.fHeight && dynamicBox.fX + dynamicBox.fWidth == unknownBox.fX)
//bot right dynamicbox collide with top left unknowbox
|| (dynamicBox.fY - dynamicBox.fHeight == unknownBox.fY && dynamicBox.fX + dynamicBox.fWidth == unknownBox.fX)
//bot left dynamicbox collide with top right unknowbox
|| (dynamicBox.fY - dynamicBox.fHeight == unknownBox.fY && dynamicBox.fX == unknownBox.fX + unknownBox.fWidth)
)
return eCollisionDirection::eNone;
//tiep xuc voi mat tren cua vat unknown
if (dynamicBox.fY - dynamicBox.fHeight == unknownBox.fY)
{
return eCollisionDirection::eTop;
}
//tiep xuc o mat duoi cua vat unknown
else if (dynamicBox.fY == unknownBox.fY - unknownBox.fHeight)
{
return eCollisionDirection::eBottom;
}
//tiep xuc o mat trai cua vat unknown
else if (dynamicBox.fX + dynamicBox.fWidth == unknownBox.fX)
{
return eCollisionDirection::eLeft;
}
//tiep xuc o mat phai cua vat unknown
else if (dynamicBox.fX == unknownBox.fX + unknownBox.fWidth)
{
return eCollisionDirection::eRight;
}
}
}
return eCollisionDirection::eNone;
}
int Box::collide(Box box, Box block)
{
// Box is the moving Box
// block is the static Box
Box broadphaseBox = getSweptBroadphaseRec(box);
if (aabbCheck(broadphaseBox, block))
{
float normalx, normaly;
float collisiontime = sweptAABB(box, block, normalx, normaly);
float remainingtime = 1.0f - collisiontime;
if (collisiontime <1.0f)
{
if (normalx == -1)
return 2; //right
if (normalx == 1)
return 1; //left
if (normaly == -1)
return 4;//top
if (normaly == 1)
return 3; //bottom
}
else
if (aabbCheck(box, block))
{
return 5;
}
}
return 0;
}