Tips for determining the offset of mouse coordinates while utilizing a scrollbar

I'm currently developing a whiteboard application using Raphael JS. One issue I've encountered is that when the paper size exceeds the viewable portion of the web page, right and bottom scrollbars are added. This causes problems with obtaining accurate mouse coordinates for drawing elements. For instance, if I draw a line at the bottom right corner by scrolling down the paper, the object appears only within the viewable portion of the paper. This discrepancy means that the mouse coordinates and the drawn element's position do not align properly. How can I determine the offset values for x and y coordinates that need to be adjusted in order to place the element correctly when the scrollbars are moved?

jquery raphael

Answer №1

During my experience working with Raphael and drag and drop functionality, I encountered a similar issue. It appears that the dragMove wrapper in Raphael provides a practical solution to this problem. By utilizing the scrollLeft and scrollTop properties of the document, you can accurately determine the current scroll offset. For more details, refer to the dragMove function within the uncompressed source code. Surprisingly, addressing this matter is much simpler than it initially seems.

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