2D Shape Creation

2D Shape Creation

Select one of the Shape Creation tools: Polygonal, Rectangular, or Circular.

Polygonal and arc

Select the Polygonal Shape Creation tool (press S). Click into the viewport to create the first vertex, further clicks create additional vertices. To finish the shape, you can either click on the first vertex, double click, or press Enter.

While you are drawing, you can switch between a line and an arc by pressing A. You can adjust the radius of the arc with the handles. When the tool is in this arc mode, you can change how many sides the polygon has by moving the scroll wheel.

Rectangular

Select the Rectangular Shape Creation tool (press Shift + S). Click to start drawing. Click again to define the edge. Drag the rectangle to the size you want and click. The rectangle is constrained to the line perpendicular to the first edge.

Circular

Select the Circular Shape Creation tool (press Shift + C). Click once to set the center of the circle, move the mouse to size the circle, and click again to finish.

Similarly to the arc mode, you can change how many sides the circle has by moving the scroll wheel.

Snapping

Simple snapping

By moving the cursor over existing shapes or the terrain you can snap the position to those objects. An orange rectangle is shown around the cursor when snapping is active. Additionally, the snapped component is highlighted.

Snapping to polygonal edges

After the first click, multiple snapping features are enabled. These include: Global axes, 90 degree angles, parallel lines, extensions of lines and line midpoints. All snapping features are automatically intersected to form combined snapping results. While moving the mouse, an orange dashed line is shown whenever snapping to such a feature occurs. Additionally, symbols are shown to differentiate the features:


Types: (a) global axis or line extension (b) 90 degree (c) parallel (d) midpoint (e) vertex (f) combined

Snapping to feature edges

To snap to other feature edges, hover over any shape edge and press G. The edge becomes a snapping edge for drawing. When you create a snapping edge, you can snap to guides from the edge, such as parallel or perpendicular guides. You can have up to two snapping edges at time. When you press G to make a third snapping edge, the snapping behavior is removed from the first edge.


(left) press G to make snapping edge (center) parallel rectangle edge snapped to perpendicular guide
(right) finished parallel rectangle

You can also set streets as a snapping edge.


(a) set snapping edge (b) parallel rectangle edge (c) draw rectangle (d) finished parallel rectangle

You can temporarily deactivate snapping by pressing Shift.

Splitting shapes

When the first and last vertices are snapped to an edge or vertex of the same polygon, and the whole line is contained in this polygon, the polygon is automatically split into two parts. Here is an example:


Start by creating a simple shape. Then move the cursor over the left edge until it is highlighted in orange, indicating snapping. Click to create the first vertex, then click another few times in the polygon for further vertices. Snap to the right edge, and click again, to split the shape.

Automatic closing: When the first point snaps to a shape, and the last point snaps to a line that is indirectly connected to the first point, the polygon is automatically closed along the indirect connection, as shown here:


Text entry

Click on the numerical field in the edit toolbar, enter three values for the coordinates of the starting point and press Enter. When you move the mouse the numerical field shows the length of the line, rectangle, or radius. Enter a value to set the length. With the Polygonal shape creation tool, you can enter another set of coordinates to set the next point.

When you enter a value with the polygonal and rectangle tools, the current line turns magenta and the length is fixed to the value. You can enter another value to set the length of the next segment or size of the rectangle.

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