• 7 September 2005 from 09:00 till 17:30

• 8 September 2005 from 09:00 till 17:30

Geometry lines are a superset of construction lines. They allow you to define the layout, position lines and arcs tangential to each other and defines the basic layout of the drawing elements. You can therefore simply fill in with solid lines to create the objects.

With AllyCAD’s construction lines you can resolve the layout and details of the drawing in your mind and on the screen as you go along. In addition, the useful geometry lines allow you to draw the way you would draw naturally.

Geometry has the following properties:

• It has no end points and continues into infinity.

• It is not printed or plotted.

• It is common to all layers.

There are also many geometric constructions available:

• Intersecting horizontal and vertical geometry lines (cross).

• Line at a defined angle.

• Line through two points.

• Line parallel to an existing line or circle.

• Circle.

• Up to five concentric circles.

• Circle tangent to two lines.

• Circle tangent to a line and a circle.

• Circle tangent to two circles.

• Circle tangent to three lines.

• Circle through a point and tangent to a line.

• Circle through a point and tangent to a circle.

• Circle through three points.

• Line tangent to a circle.

• Line tangent to two circles.

• Line that is a perpendicular bisector of two points or a line.

The Geometry menu is versatile and easy to use with loads of functionality. You can project solid lines and arcs to geometry lines and circles by making use of the ‘Make Geometry’ function. This duplicating function is especially useful for projecting lines into another part of the drawing, or for finding the intersection between projected lines and arcs.

Geometry may also be deleted or may be switched on or off at will. To switch geometry off, go to the Settings Menu and select ‘Show Geometry’ under ‘View Settings’. The message Don’t Draw Geometry’ will appear briefly on the screen. You can switch it on again by selecting ‘Geometry - Geometry On/Off’. The message ‘Draw Geometry’ will appear briefly on the screen. To delete geometry, go to ‘Geometry EI’ to delete a single geometry line or circle or go to ‘Delete All Geometry’ to delete all the geometry. Once you have deleted your geometry, the action is permanent and the information cannot be restored.

When you save your drawing, the geometry is not automatically stored. In order to set it so that your geometry automatically stores with each save, go to ‘File – Save Options’ and check the ‘Save Geometry’ box in the ‘Save Settings’ option before saving. Once this option has been checked, your geometry will be saved in a file with the same name as your drawing, but the extension will show .geo instead of .drg. Alternatively, you can save your geometry using the ‘File – Save Options – Save Geometry’ option.

Geometry is represented by construction lines and circles which can be used as guide lines for tracing over, for determining the positions of points, for determining line and arc intersection points and for projecting existing lines to another part of the drawing. Geometry entities are therefore necessary to allow for the precise layout of complex shapes quickly and effectively.
 

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