Welcome, Guest. Please login or register. Did you miss your activation email?
Pages: [1]

Author Topic: [solved] how to detect mouse if over a character?  (Read 3130 times)

0 Members and 1 Guest are viewing this topic.

coding99

  • Newbie
  • *
  • Posts: 5
    • View Profile
    • Email
[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 »
Logged
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

  • Administrator
  • Hero Member
  • *****
  • Posts: 32498
    • View Profile
    • SFML's website
    • Email
Re: how to detect mouse if over a character?
« Reply #1 on: May 31, 2012, 06:12:26 pm »
Which version of SFML?
Logged
Laurent Gomila - SFML developer

coding99

  • Newbie
  • *
  • Posts: 5
    • View Profile
    • Email
Re: how to detect mouse if over a character?
« Reply #2 on: May 31, 2012, 06:22:29 pm »
version 1.6
Logged
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

  • SFML Team
  • Hero Member
  • *****
  • Posts: 11034
    • View Profile
    • development blog
    • Email
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.
Logged
Official FAQ: https://www.sfml-dev.org/faq.php
Official Discord Server: https://discord.gg/nr4X7Fh
——————————————————————
Dev Blog: https://duerrenberger.dev/blog/

coding99

  • Newbie
  • *
  • Posts: 5
    • View Profile
    • Email
Re: [solved] how to detect mouse if over a character?
« Reply #4 on: May 31, 2012, 07:00:18 pm »
thank you  :)
Logged
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

  • Newbie
  • *
  • Posts: 44
    • View Profile
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.
Logged

Laurent

  • Administrator
  • Hero Member
  • *****
  • Posts: 32498
    • View Profile
    • SFML's website
    • Email
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.
Logged
Laurent Gomila - SFML developer

vro

  • Newbie
  • *
  • Posts: 44
    • View Profile
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?
Logged

Laurent

  • Administrator
  • Hero Member
  • *****
  • Posts: 32498
    • View Profile
    • SFML's website
    • Email
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.
Logged
Laurent Gomila - SFML developer
Pages: [1]