Trouble with sprites

oiky · April 2013

Hi, everyone!
I ran into a problem with the image.
If I click in the red circle, pressing is not transmitted sprite 2 , only sprite 3 (as I understand this is due to the fact that the sprite is drawn 3 later than sprite 2)
How can I solve this problem?

P.S. I'm from Russia and use Google Translate to talk to you, take my apologize

ar2rsawseen · April 2013

@oiky yes it receives the event first, and if you use stopPropagation method then it stops the event from reaching other elements. Just remove it if you have something similar

oiky · April 2013

@ar2rsawseen if I remove stopPropagation then pressing is transmitted sprite 2 and sprite 3 too

ar2rsawseen · April 2013

@oiky yes, because as you've drawn, they are overlaying.

Quick solution would be to scale down the image, when hit testing it, like:

functiom SomeButton:onMouseDown(e)
    self:setScale(0.5) -- or any other you are comfortable, without overlaying the images
    if self:hitTestPoint(e.x, e.y) then
        --your button was clicked, do what you wanted here
    end
    self:setScale(1) -- return it back to normal
end

I know thats probably a dirty hack, but thats first that came to my mind

krisis · April 2013

Or write your own hitTestPoint function that takes into consideration the shape of those isometric tiles. You'll find lots of information googling for isometric hit testing.

OZApps · April 2013

@Oiky, just a thought, what is the position (z-index) of sprite 2 and sprite3? You can use stopPropagation() so that the other sprite does not emit an event. However *I think* that sprite on the top will get the event first, so make sure that the z-order is set accordingly.

Scouser · April 2013

@oiky: You could always use something like pointInPolygon to see if the point you touched is within your sprite.

john26 · April 2013

As @Scouser says, there is nothing "magic" about hitTestPoint. You can always write your own function to suit your own needs. I think that is the best solution in your case.

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