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Waugh

Thu May 24, 2018 12:37 pm


Guitar hero animation flickering problem

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I'm programming a guitar hero game for my programming class and I am having difficulty with the animation of the circle things that fall down that you tap.
The problem is that because I have the "cls" part in each of the codes, it will run and clear the screen from all of the other falling objects as well, which gives the flickering effect.
I need help with what I should do to achieve this effect without the flickering. Should I use the View.Update style things, if so how? Or if anyone has any better ideas I am open to them of course.
Thank you!






Here is that section of the code to help visualize/ make it easier to know what I mean (the "cls" parts have been bolded, as they are the issue spots so I figured it might be easier to make them stand out):

process Blue
    var Purple_y1 : int := 620
    var Purple_y2 : int := 680

    for i : 1 .. 90
        cls
        drawfillstar (100, Purple_y1, 160, Purple_y2, 13)
        Purple_y1 := Purple_y1 - 15
        Purple_y2 := Purple_y2 - 15
        delay (25)
    end for

end Blue

process Red
    var Red_y1 : int := 620
    var Red_y2 : int := 680

    for i : 1 .. 90
        cls
        drawfillstar (360, Red_y1, 420, Red_y2, 12)
        Red_y1 := Red_y1 - 15
        Red_y2 := Red_y2 - 15
        delay (25)
    end for
end Red

fork Blue
fork Red


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Insectoid

Fri May 25, 2018 12:33 pm


RE:Guitar hero animation flickering problem

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Instead of having two processes running simultaneously, you can use a single procedure that moves both circles, then draws both circles, and then erases everything, with just one loop.


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Srlancelot39

Fri May 25, 2018 1:17 pm


Re: Guitar hero animation flickering problem

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In my experience, you should only need one clear statement and one update statement (per "thread"?).  This will not only reduce/avoid flashing, but also make your code more clear and easy to follow.

As Insectoid said, what you are doing can be done in just one process/thread (i.e. the main program "thread")...which is good, because Turing doesn't do parallel processing properly and this shows when graphics are run in a process.  In contrast, audio doesn't seem to be affected when run in a process.