The touch player answers a laptop trackpad. In fullscreen, a two-finger swipe left or right switches angle and up or down jumps between markers, just as a finger does on a tablet, with no need to switch the touch controls on first. Swipes follow the content, so with natural scrolling fingers moving left means the next angle.
A trackpad pinch zooms the picture about the cursor, with the same range and snap-back as a two-finger pinch on the glass.
A quick mouse flick across the picture switches angle too.
