Arc/Centre,R,Start,End
Arc by Centre, Radius, and Angles
Creates an arc defined by a centre point, radius, start angle, and end angle. CW/CCW selector required.
What It Does
The Arc/Centre,R,Start,End operator creates an arc defined by a centre point, radius, start angle, and end angle. CW/CCW specifies the sweep direction.
Syntax
Arc/Centre, P, R, Start, End, CW|CCW
Quick Input
C: [centre point]
R: [radius]
Start: [start angle degrees]
End: [end angle degrees]
Dir: ○ CW ● CCW
Direction Selector
| Selector | Meaning |
|---|---|
CCW | Sweeps counter-clockwise from start to end |
CW | Sweeps clockwise from start to end |
Worked Examples
P0=(0,0)
Arc/Centre, P0, R=50, Start=0, End=90, CCW
→ A0: quarter circle CCW
Start: (50,0) End: (0,50) Sweep: 90° CCW
Arc/Centre, P0, R=50, Start=0, End=90, CW
→ A1: three-quarter circle CW Sweep: 270° CW
Analytic Rule
Start point: (cx+r*cos(A_start), cy+r*sin(A_start))
End point: (cx+r*cos(A_end), cy+r*sin(A_end))
Sweep direction: CCW or CW
Result: Exact analytic arc.
FAQ
What is the difference between CW and CCW?
CCW sweeps in the positive angular direction. CW sweeps in the negative direction. Same start/end angles with different directions produce complementary arcs.
Can start and end be the same?
This creates a full circle (360° sweep) or zero-length arc depending on direction.