Enlarge Touch area of an asset/sprite

Dikkesnoek

Hello,

Regarding my previous question (Sprites with random text), is it possible like in Xcode/Cocoa
to enlarge the touch area of a sprite? I have a sprite, for example 80x80 px and want a touch
area of 100x100 px (10 pixels extra around the sprite).

Also can you always use onMouse events instead of onTouches? They both work on the simulator.

Thanks,

Marc

Mells

Hi Marc,

I'm not sure if what you ask is available.
But an alternative way would be to add a bigger child (touch area) to your sprite (text container), that would be responsible of event listeners (like a "bounding" or "collision" box).
When this touch area detects an event, an action is triggered on its parent (getParent()).

techdojo

Sorry @Mells - actually it's easy .

When you add a touch listener to a sprite, ALL sprites with touch listeners receive all the events (unless one calls the event.stopPropagation() function), so all you have to do is instead of calling Sprite:testHitPoint() just call Sprite:getBounds() which returns the screen position and then adjust the size of the bounds and do the in box comparison yourself. It's exactly what I do when I press a button - I have an "extended" area around the sprite so you can slightly move off without loosing a potential press.

eg.

function Object:touchListener(event) local x,y,w,h = self:getBounds(stage) x = x - extend y = y - extend w = w + extend + extend h = h + extend + extend   if event.x < x or event.x > (x+w) then return end if event.y < y or event.y > (y+h) then return end   -- hit this object...   event.stopPropagation() end

Mells

@techdojo ha, at least I've tried

Dikkesnoek

Thanks again. First I tried to enlarge the sprite with some extra transparent space.
But this will also reduce the available space in my sprite sheet.

Regards,

Marc

ar2rsawseen

Hmm, how about

function Object:touchListener(event) --scale object self:setScale(2) --or whatever scale you want if self:hitTestPoint(event.x, event.y) then --you've got a touch event end --scale back self:setScale(1) event.stopPropagation() end

Scouser

@ar2rsawseen: That would only work if the object's anchor point was centred. As you currently can't set the anchor point for shapes or text areas then this method wouldn't work.

ar2rsawseen

@Scouser, yes you're right. It was just a spontaneous idea