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tint() (Read 954 times)
rpw029
tint()
Dec 28th, 2009, 8:56pm  
Just a quick question on image transparency..
i was wondering..I'm trying to make it so that when my character 'collects' an item the image of the item disappears.. is there a way that I can do this, like using 'null' for an image parameter, or should I change it so it's like:

tint(255, 0);
image(item, x, y);

?
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JR
Re: tint()
Reply #1 - Dec 29th, 2009, 12:44am  
Yes, don't draw the image ...
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blindfish
Re: tint()
Reply #2 - Dec 29th, 2009, 1:04am  
Exactly - if you're drawing a fresh background each frame just don't draw the image once it's collected (if your items are class based you could just build a condition into the item's display method).  Your solution is rather inefficient since you're still requesting it to be drawn, albeit with alpha = 0...
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Where is the what if the what is in why?
 
rpw029
Re: tint()
Reply #3 - Dec 29th, 2009, 9:47am  
I did make it so that my items are class-based, but I was just unsure about how to make a condition so that it won't draw that one class after it has been collected..it seems like a simple enough problem, I'm just overlooking something =x. Would I say like:

if (collect == true){
    image(null, x, y);
}

or I believe null isn't a valid parameter for 'image.' =/
I just don't know how to actually make it so that the item disappears once collected.
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blindfish
Re: tint()
Reply #4 - Dec 29th, 2009, 9:52am  
Put the condition around the code where you draw it:

if(!collect){
 image(myImg,x,y);
}

i.e. if the item hasn't been collected draw it, otherwise do nothing...
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Where is the what if the what is in why?
 
rpw029
Re: tint()
Reply #5 - Dec 29th, 2009, 10:08am  
That makes sense xD;
heh, thanks, that works.
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