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The Stroke Tool previewing an outline ring around a polygon with its settings panel open

Stroke Tool

The Stroke Tool turns a polygon’s edge into an outline ring — walls along a room, a curb around a pad, a border around any filled shape. Hover a polygon on the selected layer to preview the ring, click to create it. The ring is always created as a feature on a custom style layer, never on the source layer.

Make a stroke

Hover a polygon on the selected layer — the ring previews under the cursor.
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Hover a polygon on the selected layer — the ring previews under the cursor.
  1. Select a polygon layer (structures or a custom style) in the Layers panel — the Stroke Tool stays disabled until a layer is selected.
  2. Click the Stroke Tool in the toolbar. Its settings panel opens with Wall Thickness, Stroke Alignment, Corner Style, and the target style layer list.
  3. Hover a polygon on the selected layer — a preview ring appears in the target layer’s color.
  4. Click the polygon to create the ring.

Notes

  • The stroke is computed from the polygon’s true geometry, not the on-screen tiles.
  • Each click is a complete stroke — there is no finish step, and each stroke is one undo (Ctrl+Z / Cmd+Z). Pick another toolbar tool to leave the Stroke Tool.
  • Switching floors deactivates the tool — the source layer and the floor’s style layers change with the floor, so select a layer on the new floor and start again.
  • Coincident duplicate points on the source are welded automatically first (a message reports how many were cleaned). A shape that collapses to a line, or whose outline crosses itself, is refused with a message explaining why.
  • An outer ring that breaks into several pieces is created as separate style features.

Publish impact: the ring is created on the chosen custom style layer, which publishes as part of that layer’s geojson:styles dataset. It stays in your draft until you Publish.

Inner and outer strokes

Inner builds the ring inside the edge and shrinks the source polygon to fit.
Inner builds the ring inside the edge and shrinks the source polygon to fit.

Stroke Alignment sets which side of the edge the ring is built on. Default: Outer.

  • Outer builds the ring outside the polygon’s edge. The source polygon is left unchanged.
  • Inner builds the ring inside the edge and shrinks the source polygon to fit inside it, replacing the source geometry.

Notes

  • An inner stroke that would split the source into multiple polygons is not committed.
  • A width too large for a small polygon can leave no room for an inner ring — nothing is created; lower the width or use Outer.

Choose the custom style target

Choose Style Layer picks which custom style layer receives the ring; the choice reads back under Selected Layer.
Choose Style Layer picks which custom style layer receives the ring; the choice reads back under Selected Layer.

The Choose Style Layer list sets which custom style layer receives the ring.

  1. With the Stroke Tool active, find your custom style layers in the settings panel — each shown with its color swatch and name.
  2. Click a layer to make it the target. The current choice appears under Selected Layer:.

Notes

  • The list shows only custom style layers on the current floor (a layer with no floor binding shows on every floor and always stays).
  • The first custom style layer is selected automatically; if your target is removed, the panel falls back to the first available one.
  • With no custom style layers the panel shows No style layers available — add a style layer first.
  • The ring inherits the target layer’s color, opacity, and height.

Set the stroke width

Wall Thickness sets the ring width in meters — the preview follows as you type.
Wall Thickness sets the ring width in meters — the preview follows as you type.

Wall Thickness sets how thick the ring is, in meters.

  1. Type a value in the Wall Thickness field — 0.1 to 5.0 meters in steps of 0.1 (default 0.5; the panel suggests 0.3–2.0).
  2. Hover a polygon to preview the ring at the new width, then click to create it.

Notes

  • The width is the distance the edge is offset — it applies the same way to inner and outer strokes.

Round and square corners

Round sweeps each corner with a curved arc.
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Round sweeps each corner with a curved arc.

Corner Style sets how the ring turns each corner of the polygon. Default: Round.

  • Round sweeps each corner with a curved arc.
  • Square keeps corners sharp by offsetting the edges in straight lines and joining them at a point — like mitre corners in QGIS.

Notes

  • The setting applies to both inner and outer strokes.
  • On a very sharp (acute) corner, Square falls back to a plain offset point rather than a long spike, so the corner stays clean.

Glossary

  • Stroke / ring — the outline feature the tool creates from a polygon’s edge.
  • Wall Thickness — the ring’s width in meters (0.1–5.0).
  • Stroke Alignment — which side of the edge the ring is built on: Outer (outside, source untouched) or Inner (inside, source shrunk to fit).
  • Corner Style — Round (arced) or Square (sharp mitre) corners.
  • Target style layer — the custom style layer the ring is created on; it gives the ring its color, opacity, and height.
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