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I agree with the 2 answers above and would add that the handles provide an affordance by conveying that there are areas on the shape that can be interacted with. Looking at the figure on the left, without the handles, it would be difficult to know what can be done with the shape. It also feels like a non-editable graphic compared to the one on the right. ...


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It's design for the majority use-case This is an example of use case design. For many drawing/canvas programs (e.g. Visio, PowerPoint, Slides) users want to: Connect shapes quickly, which means that hunting around for the right angle can be unnecessarily frustrating. Maintain a reasonable layout in the overall diagram, which usually results in preferred ...


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What is the problem that handles solve? The problem is how to make it easier to create smooth curves in drawing software. The handles are essentially a visual way to directly interact with the line vs. writing mathematical formulas. More info: Bezier curves If you want a handle on a circle at the 33 degree mark, rotate the circle 33 degrees. EDIT: ...



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