What this does
Drag-and-drop is the fastest way to move a marker from one group to another. Useful when:
- ZeroCount split one symbol into two groups and you want to consolidate without merging.
- A marker landed in the wrong group during Auto Count Symbol (the matcher misclassified it).
- You're refining group boundaries in Stage 2.
The marker keeps its position on the drawing — only the parent group changes.
Dragging a single marker
- 1
Click and hold the marker on the canvas. Don't release yet.
- 2
Drag towards the sidebar. The other marker groups in the same section highlight as drop targets when you hover over them.
- 3
Release on top of the target group. The marker re-parents instantly.
The source group's count goes down by one; the target group's count goes up. Both update live.
Type constraints
You can only drag a marker to another group of the same type. So:
- A Detection marker can move to another Detection group.
- A Linear marker can move to another Linear group.
- A Detection marker cannot move to a Unit group, and so on.
If you drop a marker on a group of the wrong type, nothing happens — the marker stays in its original group.
This is by design: each type has different metadata (lengths for Linear, areas for Area, images for Detection), so a Linear marker simply doesn't make sense inside a Unit group.
Dragging multiple markers
You can multi-select and drag the selection:
- 1
Select multiple markers — see Selecting and moving markers.
- 2
Click and hold one of the selected markers and drag towards the sidebar.
- 3
Release on the target group. Every marker in the selection that matches the target's type re-parents. Mismatched-type markers in the selection stay where they are.
Multi-marker drag is the right tool when you've used a marquee to grab a cluster of mis-grouped markers. For every marker in a group, use merge instead.
Drag visual feedback
While you're dragging:
- The source marker shows a "ghost" outline at its position.
- Compatible target groups in the sidebar highlight.
- Incompatible groups (wrong type) appear dimmed.
- A small drag indicator follows the cursor.
Releasing outside a valid drop target cancels the drag — the marker stays put.
Drag vs Merge — when to use which
| Scenario | Use |
|---|---|
| Moving 1–10 markers between groups | Drag |
| Consolidating two whole groups into one | Merge |
| Moving every marker but wanting both groups to remain | Drag (one by one) — merge would delete the source |
| Markers are across many drawings | Cross-file operations — see Cross-file merging |