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Asked: 2026-05-14T14:52:30+00:00

I was wondering how drawing applications draw the entire time the mouse is down

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I was wondering how drawing applications draw the entire time the mouse is down without having empty gaps. What I mean is, for example if the program only drew circles at the mouse’s X, y coordinate, then if the mouse went too quicly it would seem like a bunch of little circles rather than a nice continuous line. How can this be done without constantly drawing a short straight line between where the mouse was 0.001 seconds ago and where the mouse now is.
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  1. Editorial Team

    It can’t be done without constantly drawing a line between the current mouse point and the previous point, which is why this is what drawing programs generally do do.

    Fancier drawing programs will fit curvy lines to multiple previous points to achieve a more natural drawing stroke, but the principle is the same.

    Update: Based on a comment, it appears that you have a timer involved in your drawing code. This is surely unnecessary, since your application will generate a MouseMove event whenever the mouse is moved at all, and you can use that event to draw the next line.

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