2D Tools

Measurement, labeling, collision detection, and export in the 2D CAD Viewer.

Measurement Tool

Distance Measurement

1. Activate the Measure tool ( or key M)
2. Click on the start point
3. Click on the end point
4. The distance is displayed as a line with a label

The measurement shows:

• Distance in the current unit (meters, if CRS is defined)
• Measurement points as colored markers
• Measurement line between the points

Area Measurement

1. Activate the Measure tool ()
2. Click successively on the vertices of the area
3. Double-click to close the polygon
4. The area and perimeter are displayed

Coordinate Display

The 2D Viewer shows the current cursor coordinates in real time (bottom left of the viewer). The coordinates use the CRS of the active layer.

Clearing Measurements

• Key Delete / Backspace - Clear all measurements
• → "Clear Measurements" in the toolbar

Snapping

When snapping is active, measurement points automatically snap to existing feature vertices for precise measurements.

Labels

Display automatic feature labels on the drawing.

Activating Labels

Click in the toolbar or press L.

Configuration

Labels can be configured:

Setting	Description
Attribute	Which DXF attribute is used as label text
Font size	Size of the labels
Color	Text and background color
Style presets	Predefined label styles

Collision Avoidance

The system uses a quadtree algorithm to automatically hide overlapping labels. Only labels with sufficient space are displayed.

Auto-Update

Labels are automatically updated when you zoom or pan. At closer zoom levels, more labels become visible.

2D Collision Detection

Detect overlaps between features of different 2D layers.

Starting Collision Detection

1. Click → "Collision Detection" in the toolbar
2. Select the first layer (Layer A)
3. Select the second layer (Layer B)
4. Click "Start Detection"

Results

The collision detection uses Shapely/STRtree for fast spatial analysis:

Column	Description
Feature A	Element from Layer A
Feature B	Element from Layer B
Type	Type of overlap (intersection, touching, containment)
Area	Overlap area (m²)

Viewing a Collision

Click on a row in the results list:

• The colliding features are highlighted
• The view zooms to the overlap

Common Use Cases

• Utility line collisions in site plans
• Overlap of construction areas and existing trees
• Setback area verification

Export

Export Formats

Format	Description	Use Case
PNG	Raster image	Presentations, reports
SVG	Vector graphic	Scalable output, printing
GeoJSON	Geodata format	GIS post-processing
DXF	CAD exchange	Return to CAD software

Performing an Export

1. Click → "Export" in the toolbar
2. Select the format
3. Configure the options:

PNG Options:

• Scale - Resolution (1x, 2x, 4x)
• Background - Transparent or colored
• Include basemap - Export background map as well

SVG Options:

• Preserve layers - Separate SVG groups per layer

GeoJSON Options:

• CRS - Coordinate system of the output
• Layers - Which layers to export

DXF Options:

• Version - DXF version for the output

4. Click "Export"
5. The file is automatically downloaded

Keyboard Shortcut Reference

Key	Function
F / H / V	Fit all to view
+ / =	Zoom in
-	Zoom out
S	Select tool
P	Pan
M	Measure tool
I	Identify
L	Toggle labels
Space (hold)	Temporary pan
Ctrl + A	Select all features
Escape	Cancel tool / reset
Delete / Backspace	Clear measurements

See Also

• 2D CAD Viewer - Overview and navigation
• 2D Layers & Import - Layer management and data import
• Collision Detection - 3D collision detection
• Measurement Tool - 3D measurement tool