Euclidean Prime Rectangle

Interactive rectangle 
Continuous GCD calculation.
Shows integer points of rectangles with same area

4 Spinners:
Area, Height, Width,  Products with same area

4 Buttons:
Show integer hyperbola dots of same area rectangles (movement constrained to this)
Vertical movement (constrained horizontal)
Horizontal movement (constrained vertical)
Show integer dots of same ratio rectangles  (movement constrained to this)