1.0x
| Feature ID | Type | Deviation | Tolerance | Result |
|---|
| Tool | Key | How to use |
|---|---|---|
| Select | V | Click annotation to select; drag to move |
| Calibrate | C | Click two points of known distance and enter value; or click a circle of known diameter |
| Distance | D | Click two points |
| Angle | A | Click three points (middle point is the vertex) |
| Circle | O | Click three points on the circumference |
| Fit Arc | F | Click ≥3 points on an arc or circle edge, double-click to confirm |
| Center Dist | M | Click two circles to measure center-to-center distance |
| Detect | E | Opens detection panel |
| Para | L | Click a reference line, then two points (parallel constraint) or a second line (shows parallelism angle) |
| Perp | P | Click a reference line, then two points; line is constrained perpendicular to it |
| Area | R | Click ≥3 points to define a polygon, double-click to confirm |
| Pt-Circle | G | Click a circle, then click a free point — measures shortest gap to the circle edge |
| Intersect | I | Click two line annotations — marks their mathematical intersection (even off-screen) |
| Slot | W | Click two line annotations — measures perpendicular distance between the lines |
| Key | Action |
|---|---|
| Escape | Back to Select / cancel |
| Delete / Backspace | Delete selected annotation |
| ? | This help dialog |
| Alt + click | Bypass snap (precision placement) |
| ⊙ (toolbar) | Click toolbar ⊙ then click canvas to set coordinate origin; hovering shows X/Y relative to origin |