Cocos2d-x 3.2 Mobile game backgrounds and Sprites

1, first new listener event

Auto listener = Eventlistenertouchonebyone::create (); Listener->setswallowtouches (True);listener-> Ontouchbegan = Cc_callback_2 (Startgame::ontouchbegan, this); listener->ontouchmoved = Cc_callback_2 (StartGame::o Ntouchmoved, this): listener->ontouchended = Cc_callback_2 (startgame::ontouchended, this);_eventdispatcher-> Addeventlistenerwithscenegraphpriority (listener, this);

2, the Listener method callback function implementation

bool    Startgame::ontouchbegan (touch* touch, event* Event) {Point touchlocation = This->converttouchtonodespace (Touch);    This->selectspritefortouch (touchlocation); return true;} void startgame::ontouchmoved (touch* touch, event* Event) {Point touchlocation = This->converttouchtonodespace (Touch    );    Point oldtouchlocation = Touch->getpreviouslocation ();    Oldtouchlocation = This->converttonodespace (oldtouchlocation); Point translation = touchlocation-oldtouchlocation;//Gets the moved distance Cclog ("Touchlocation--------------------%d-------%d", TOUCHLOCATION.X,TOUCHLOCATION.Y); Cclog ("Oldtouchlocation--------------------%d-------%d", OLDTOUCHLOCATION.X,OLDTOUCHLOCATION.Y);    Cclog ("Translation--------------------%d-------%d", TRANSLATION.X,TRANSLATION.Y); This->boundlayerpos (translation);//Background move function 

    This->panfortranslation (translation);//elf Move function}void startgame::ontouchended (touch* Touch, event* Event) {}

3, method implementation

Background event, loading a background image in Init

void Startgame::boundlayerpos (Point newtouch) {    Size winsize = director::getinstance ()->getwinsize (); Point newpos = this->getposition () + Newtouch;auto map = Getchildbytag (102); Get background picture here    newpos.x = MIN (newpos.x, 0);    Newpos.x = MAX (newpos.x,-map->getcontentsize (). width+winsize.width);    Newpos.y = MIN (newpos.y,0); newpos.y = MAX (Newpos.y,-map->getcontentsize (). Height + winsize.height);    This->setposition (Newpos);}

Implementation of the Sprite Move method

Load an elf in init

void Startgame::p anfortranslation (point translation) {Auto Sprite = Getchildbytag (101);//Get elf point    Newpos = Sprite->getposition () + translation;    Sprite->setposition (Newpos);    }

This is OK.

The sprite or background image movement is in the touch screen monitoring event ontouchmoved (touch* touch,event *) to get the original touch point and move the touch screen point, to get their difference, to the sprite or background image repositioning SetPosition ( Point * point), which completes the movement of the background and sprite (background image to determine the boundary is worth)

Note that node can return the bounding rectangle of the sprite through the function Getboundingbox. This is much better than manually calculating the bounding rectangle of the sprite yourself. Because, first, it's simpler; second, it takes into account the position-coordinate transformation of the sprite. (such as the anchor point has changed, to perform the corresponding matrix transformation, specific reference to the source code, these are no longer detailed.) ）

Click on the selected time can let the elves do some action, here is flashing

void Startgame::selectspritefortouch (Point touchlocation) {Auto Sprite = Getchildbytag (101);       if (Sprite->getboundingbox (). Containspoint (touchlocation))    {            auto blink = ccblink::create (2.0f,5); Sprite->runaction (blink);    }      }

Cocos2d-x 3.2 Mobile game backgrounds and Sprites