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Author Topic: [solved] how to detect mouse if over a character?  (Read 3116 times)

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coding99

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[solved] how to detect mouse if over a character?
« on: May 31, 2012, 05:54:37 pm »


this is my image(png format).
at center of image is my character(red color) and have a transparency background.

how to detect if mouse over my character(red color) not include over transparency background.

ps.sorry for my poor english.
« Last Edit: May 31, 2012, 06:54:55 pm by coding99 »
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I use SFML version 1.6 and sorry for my poor English.
- sfml1.6 can compile cleanly with gcc 4.4(recommended)-4.5 and gcc 4.6-4.7 must define NULL or modify some code
- compiling sfml1.6 with codeblocks is good on codeblocks 8.02(10.05 alway add .dll suffix)

Laurent

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Re: how to detect mouse if over a character?
« Reply #1 on: May 31, 2012, 06:12:26 pm »
Which version of SFML?
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Laurent Gomila - SFML developer

coding99

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Re: how to detect mouse if over a character?
« Reply #2 on: May 31, 2012, 06:22:29 pm »
version 1.6
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I use SFML version 1.6 and sorry for my poor English.
- sfml1.6 can compile cleanly with gcc 4.4(recommended)-4.5 and gcc 4.6-4.7 must define NULL or modify some code
- compiling sfml1.6 with codeblocks is good on codeblocks 8.02(10.05 alway add .dll suffix)

eXpl0it3r

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Re: how to detect mouse if over a character?
« Reply #3 on: May 31, 2012, 06:37:03 pm »
Get the pixel under the mouse position and check the alpha channel of that pixel.
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coding99

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Re: [solved] how to detect mouse if over a character?
« Reply #4 on: May 31, 2012, 07:00:18 pm »
thank you  :)
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I use SFML version 1.6 and sorry for my poor English.
- sfml1.6 can compile cleanly with gcc 4.4(recommended)-4.5 and gcc 4.6-4.7 must define NULL or modify some code
- compiling sfml1.6 with codeblocks is good on codeblocks 8.02(10.05 alway add .dll suffix)

vro

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Re: [solved] how to detect mouse if over a character?
« Reply #5 on: June 03, 2012, 06:26:00 am »
What would the answer have been for sfml 2.0?
I'm sure I could be doing it better than the way I currently am.
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Laurent

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Re: [solved] how to detect mouse if over a character?
« Reply #6 on: June 03, 2012, 08:55:39 am »
With SFML 2 you would have to store a "collision map" (a 2D array of booleans), created after you load the texture, because you can't easily read from a sf::Texture.
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Laurent Gomila - SFML developer

vro

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Re: [solved] how to detect mouse if over a character?
« Reply #7 on: June 03, 2012, 09:45:23 am »
The (likely worse) way that I was doing is just checking if mouse x and y lied between the min and max x and y values of the sprite's rectangle... is that pretty bad or is it alright?
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Laurent

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Re: [solved] how to detect mouse if over a character?
« Reply #8 on: June 03, 2012, 10:41:57 am »
It's not good ar bad, it depends on what you want. If an approximate detection using the sprite's rectangle is all that you need then it's perfect, if you need a more precise detection then you'll have to play with the alpha channel of the image.
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Laurent Gomila - SFML developer
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