Changing CCSprite position leads to disappearing from screen

Question

Faced strange behaviour of CCSprite positioning on a screen. Scenario is simple: change sprite position on touch (dragging item on a screen).

private void HandleInput(List<CCTouch> arg1, CCEvent arg2)
{
    base.Position = arg1.Last().LocationOnScreen;
}

After setting base.Position to LocationOnScreen it simply disappears.

NOTE: cocossharp is a c# port of famous framework and is quite similar in its structure and implementation to cocos2d-x hence adding this tag.
Any help appreciated.

Have you tried logging `arg1.Last().LocationOnScreen`? Where is your `base` added? — musikov, Sep 29 '15 at 17:17
Location seems to be reasonable (it points to coordinates within visible screen). — Anatolii Gabuza, Sep 29 '15 at 18:06

score 2 · Answer 1 · answered Sep 30 '15 at 05:44

In cocos2d-x nodes are positioned relative to their parents content area.

Typically, to position a sprite in cocos2d-x using a touch derived (world space) co-ordinate you would use the convertToNodeSpace method on the parent.

In c++ because cocos2d-x:

void setSpritePositionWhenTouched(Node* sprite, const Vec2& touchPos)
{
  auto parent = sprite->getParent();
  auto pos = parent->convertToNodeSpace(touchPos);
  sprite->setPosition(pos);
}

Changing CCSprite position leads to disappearing from screen

1 Answers1