center
0, 0
zoom
8
px/cell
cursor
–
rule
–
−
+
⌂
go
,
→
factor map.
Pixel (x,y) is black ⇔ row y is a whole factor of column x (x mod y = 0). Right = +x, up = +y. Origin forced black; the y=0 axis is undefined (white).
Drag to pan · scroll / pinch to zoom · click to recenter · double-click to zoom in.