Is there a function similar to rbbox that draws a line from corner to corner?
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I am currently using rbbox to select a point on the axis and draw a ray to some other point. The rbbox draws the outline of the rectangle as I drag the mouse cursor around. When rbbox is done, I draw the line from the starting corner to the ending corner. However, my goal is to make a line parallel to a feature on the axis (image) and I find that I cannot do this precisely being able to see only the rectangle outline. I'd really like rbbox to draw a line corner-to-corner as I drag the mouse cursor. Is there a function similar to rbbox that can help me with this? Or do I need to write my own "real-time" line drawer?
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