Photo — Zoom point
A slideshow that dives into each photograph at a chosen spot — click a picture and its zoom cycles re-aim at that exact point.
Each photograph gets a slice of the loop and, inside it, a smooth plunge toward one point and back out, with a small ring marking the target. The point is not fixed: clicking anywhere on the picture moves it there, remembered per photo, so the next pass dives exactly where you pointed.
A click is un-projected through the current pan-and-zoom transform back into image coordinates and stored as a fractional position on that photo, so it survives refits and resizes. The zoom is a triangle wave eased per cycle, the pan is derived so the chosen point stays pinned at the centre of the frame, and the ring's size is divided by the zoom so the marker never grows.
