I have a line which can be horizontal or diagnol, and the user can make it longer or short by dragging an end.
If the user should click anywhere on the line I need to keep track of this and place a marker or callout over this clicked spot on the line at all times. So if the user clicks say 1/4, say 100 pixels from the bottom of the line) the way down from the top left of a diagonal line I need to put a marker there. Then if the user drags the line to make it twice as long I still need that marker to be in the same spot. How would I do this math wise? And no I don't want it to be a percentage of the length of the line. Meaning I always want the spot to be 100 pixels from bottom of the line. TIA, J
