Controls

9.35
6.30
-0.25

Base frame (x, y)

x = 0.00
y = 0.00
x² + y² = 0.00

Rotated frame (x′, y′)

x′ = 0.00
y′ = 0.00
x′² + y′² = 0.00
Invariant distance x² + y² = x′² + y′² (rotation preserves distance)
adjust angle • W/S y • A/D x