2D drawing – construction lines
Creating grid of construction lines
When creating a 2D drawing, you can use a mesh of auxiliary construction lines. Construction lines can be created as vertical, horizontal or under two predefined angles. They can be defined by distance from a selected point, from previous construction line or they can be dragged by cursor.
Here, horizontal construction lines are created. After selection of a point, direction to first line is defined.
See also Construction Lines or Grid.
Distance from point to first and second horizontal construction line is defined.
Dragging of construction line by cursor is selected. You can define an increment of distance. By default, 1 mm is used for working in ISO units. Select a point, a direction the construction line is created at, and then move the cursor. Distance from initial point or from previous line is displayed near the cursor. Here, measurement of direction from previous line is selected. Left-click mouse button, a new construction line is inserted. If necessary, wrong insertion of a construction line can be undone by command UNDO, similarly as for any 2D or 3D object.
2D drawing – lines, filleting, offsets
To fillet corners, you can detect them automatically or select both line or arc segments individually. The automatic detection is used in this example. Similar methods are available also for chamfering and creation of corners.
See Creating Corners, Chamfers and Fillets.
2D offset, a curve is temporarily integrated from arcs and line segments
Define an offset distance before the offset is created. In this case, offset is created to the object which is temporarily integrated from line segments and arcs. Click the first segment. Then select a direction the poly-line will be integrated at, and a side the poly-line will follow. Then left-click to confirm each added segment. Integration is finished by right-click or by reaching an open end.
In this case, left end was selected. Adjacent segments from right will be integrated. The side the poly-line follows here has no effect – there are no intersections in this example.
See also Offsets of Objects.
2D offset, selecting a side the offset is created at
After the integration is completed, select a side of offset.
Drawing a line, automatic 2D location
Finally, both curves (original and offset) are connected at the ends. The location of the points of the connecting lines is detected automatically.
In this example, the automatic detection of an end-point is used. You can always select method of location by clicking an icon at the tool-bar or by pressing Ctrl + right click and then select method from pop-up menu.
To learn more about various methods of 2D location (definition of line endpoint, arc center, arc endpoint, point on 2D NURBS curve etc), see Selecting 2D Locations.