This example demonstrates how to implement a custom click validator to make a circular drag and drop implementation. Because all DOM elements that have dimensions are rectangular, the way to implement a circular drag object is to perform calculations on mousedown to determine whether the mouse was targeting a valid portion of the element (eg, a portion within the circle).
The same method could be used to create any non-rectangular draggable object.
The Drag & Drop Utility lets you make HTML elements draggable.
For this example, we will enable drag and drop for the three
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