Cocos2dx game development simple getting started video tutorial (cocos2d-x)-3rd days

 

 

1. Data Structure Selection

// The efficiency of array insertion and deletion is low; the efficiency of searching and traversing is high.
// High efficiency of list insertion and deletion; low efficiency of searching and traversing
// Add or delete: the number of collisions between monsters and darts is small.
// Traversal: it takes more than 1.0 fps for a traversal.
// Select array

2. Collision Detection Functions

 

void HelloWorld::update(float delta) // delta = 1.0 / fps{CCArray* targetToDelete = new CCArray;CCArray* projToDelete = new CCArray;CCObject* itarget;CCObject* iproj;CCARRAY_FOREACH(_targets, itarget){CCSprite* target = (CCSprite*)itarget;CCRect targetZone = CCRectMake(target->getPositionX(),target->getPositionY(),target->getContentSize().width,target->getContentSize().height);CCARRAY_FOREACH(_projs, iproj){CCSprite* proj = (CCSprite*)iproj;CCRect projZone = CCRectMake(proj->getPositionX(),proj->getPositionY(),proj->getContentSize().width,proj->getContentSize().height);if (projZone.intersectsRect(targetZone)){projToDelete->addObject(iproj);targetToDelete->addObject(itarget);}} // end of iterate projectile} // end of iterate targetCCARRAY_FOREACH(projToDelete, iproj){_projs->removeObject(iproj);CCSprite* proj = (CCSprite*)iproj;proj->removeFromParentAndCleanup(true);}CCARRAY_FOREACH(targetToDelete, itarget){_targets->removeObject(itarget);CCSprite* target = (CCSprite*)itarget;target->removeFromParentAndCleanup(true);}targetToDelete->release();projToDelete->release();}

Note: You cannot delete a Member from CCArray while traversing CCArray.

 

 

3. Use CCSprite-> setTag (int)

In this way, different genie can be marked to distinguish them.

 

 

 

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