Drawing Ellipses and Circles

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This page demonstrates a model for drawing ellipses and circles which is much more natural and intuitive than that usually found in interactive graphics programs.



This is how most existing drawing programs let you draw circles and ellipses. Click and drag to draw ellipse. The ellipse appears inside the drag rectangle (shown in blue), so the mouse pointer doesn't actually touch the ellipse. Hold shift key to make circles. This is our improved method.  Click and drag to draw ellipse. The mouse pointer is always on the ellipse. Hold the Shift key to draw a circle, and the mouse is still on the shape. NOTE: The blue line shows the line from the starting click point to the current mouse position.
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