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A scroll bar is like a 2d camera control that controlls the scroll area's viewport's contents. I will assume you know how to render your gui in its entirety. I also strongly advice against making a gui that is complex unless it truly contributes to ux. This could lead to a mediocre gaming experience. I also strongly urge you to use a UI library. In abstract ...


Let's call the content you want to scroll content and the viewable area of that content viewPort. Your scrollbars will be at the sides of the viewport. The first step is to create a mask such that only parts within content which intersect with viewPort are visible. I can't answer exactly how to do this because it depends on your language and technologies. ...

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