Stylish
Member
Hello,
Imagine you have an isometric map built by overlapping SPImages inside a SPSprite and you want to detect what SPImage has been touched.
As you have overlapped SPImages, how do you know the real SPImage the user has touched?
I'm trying to figure out by myself but I can't!
Best regards,
baike
Moderator
You could add the touch event listener to the SPSprite and then work out which tile on the map should have fired the event. Once you get the SPTouch object from the event, you can use [touch locationInSpace:self] and then decide which tile owns touches with those coordinates. Then just call a function on that tile to process the event.
Edit:
If the player is able to drag these tiles, then you'd need to do the calculation for which tile got touched on the SPTouchPhaseBegan phase and then set an ivar to identify the tile. The SPSprite would then just be a conduit for touch events for this tile until SPTouchPhaseEnded occurs, when everything is reset.
Another alternative would be to override the "hitTest:"-method, which is used by Sparrow when finding out which object was touched. The demo project shows that with a circular button, but you could modify the code for different types of checks.
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