PyGame (Ball-E) error

Paula

Hi!

I am trying to implement a pygame in OS, so that participants can play this game after they finished completing a survey.

The game is Ball-E, taken from here: https://www.pygame.org/project/1072/1916

The survey works fine, but the game does not. Once I press on the button I created for the game, the game flashes on the screen for a very short time and then i get the error message below.

Any help is much appreciated.

Cheers!

item-stack: survey[run].Games[run].Games_loop[run].Ball_e[run]

exception type: ValueError

exception message: subsurface rectangle outside surface area

item: Ball_e

time: Wed Oct 30 14:42:13 2019

phase: run

Traceback (also in debug window)

File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\inline_script.py", line 116, in run

self.workspace._exec(self.crun)

File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\base_python_workspace.py", line 124, in _exec

exec(bytecode, self._globals)

Inline script, line 191, in <module>

Inline script, line 178, in main

ValueError: subsurface rectangle outside surface area

eduard

Hi,

Can you share your experiment here? Then we might able to get to the bottom of what is going awry here.

Eduard

Paula

survey_v12_w_games.osexp

Hi,

Thanks for the reply!

I've uploaded a simple version of the survey. To advance, please use the space bar and/or fill in the information required. :)

Paula

Paula

Later edit: deleted.

eduard

Hi Paula,

sorry for the delay. Does your last post mean the problem is resolved?

Thanks,

Eduard

Paula

Hi Eduard,

No: unfortunately, I was not able to solve it.

Any input would be much appreciated.

Paula

eduard

Hi Paula,

I looked at your code and I found the problem. However, as I don't know how this game is supposed to work exactly, and the code is too complex to get it just from looking at it, I can't fix it for you. So, I can describe it, and you have to figure out yourself what to do about it.

The issue is that the surface rotatedhas a different size than the rectangle subrect  (newimg = rotated.subsurface(subrect)

# these are the sub rect dimensions
<rect(-34, -33, 84, 83)>
# these are the rotated dimensions
<rect(0, 0, 16, 16)>

If you want to create a subsurface of a surface (rotated), it must be contained (maybe even the same) as the parent surface. So, basically your script scrashes because you want to create a subsurface of an object that lies outside its scope. To fix it, you have to make the subrect be contained in rotated. Whether you better change one or the other, I can't tell you.

Does that make sense?

I upload a version of the game, in which I arbitrarily changed the surfaces and could make the screen appear. Whether the game works as you wish it to work, I don't know (lines that I changed are 181-187

survey_v12_w_games.osexp

.

Best,

Eduard

Paula

Hi Eduard,

Thank you VERY much for your help.

Your fix worked perfectly just by keeping the change you made in lines 181-187.

Cheers,

Paula

Paula

I edited the script a bit more and in the end managed to enlarge the subsurface to get a larger ball image based on your explanation.

Thanks again for the help!