======= Constructions Overview ======

This page describes the general operations and principles of Constructions. \\
More information about all features of the Construction Tools Sidebar, see : [[110:orbitgis:tools:construction:sidebar|]].

===== What are construction tools? =====
Construction tools are used to **help you calculate and position** exact locations. Look at them as your ruler and **measure equipment** to set out new coordinates.

==== Types of constructions ====
There are 2 types of construction tools : **Points and Lines**. A Construction Point has a single location. You can create as many as you need. A Construction Line as a position and orientation but has no length. You can create as many as you need.
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Constructions are georeferenced and can be saved in a special file (*.ocf) so you can use them again or forward them to a college.
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  * Construction **Points** represent an exact position and are drawn as follows : {{43:orbitgis:data:editing:constructions:con_cpt_visual.gif?20x20&nolink}}. \\ The cross indicates the exact position, while the circle shows the snap proximity area.
  * Construction **Lines** represent an orientation at a certain position. Use them as a ruler to set out distances.

==== Constructions and editing ====

Construction tools are mostly used to edit objects. \\
While editing objects, [[110:orbitgis:tools:editing:snap|the snap function]] will use constructions as anchorpoints.

==== Example ====
{{orbitgis:preferences:constructions_example.png?400x200nolink|}}

  * This is an example of a combination from construction poinst and lines
  * Yellow constructions are highlighted, which means they are selected. **Selected constructions** are subject to some of the construction functions. For example they can be replaced over an indicated distance.
  * Green constructions are not selected. They are no subject to any construction function.
  * The **standard and highlight color** can be changed in the [[110:orbitgis:preferences:construction|Construction preferences]]
===== Construction Tools Sidebar =====

[[110:orbitgis:tools:construction:sidebar|{{toptoolbar_constructions.png|}}]]

Open [[sidebar]] :
  * from Top Toolbar : Tools > Cons