Applied Parameters: DimensionKind = DATUM
Summary
This command is used to place an Ordinate Dimension object onto the active document. An ordinate dimension is a group design object. It allows for the dimensioning of a linear distance of a collection of objects relative to a single reference object. The first object chosen is the 'base'. All subsequent objects are relative to this first object. The dimension value in each case is, therefore, the distance between each reference object and the 'base' measured in the default units. The references may be tracks, arcs, pads, vias, text, fills, polygons, or components.
Access
This command can be accessed from the PCB Editor by:
- Locating and using the Ordinate Dimension command () on the Active Bar.
If the command has been recently used from the Active Bar, it will become the active/visible button. Where other commands are available, this is indicated by a triangle at the bottom-right corner of the button. Click and hold on the active button to access a menu of all associated commands for that grouping.
Use
After launching the command, the cursor will change to a cross-hair and you will enter dimension placement mode. Placement is made by performing the following sequence of actions:
- Position the cursor then click or press Enter to anchor the dimension start point (this is the first reference object or 'base').
- Move the cursor to the next required object then click or press Enter to anchor the dimension end point (this is the second reference object).
- Move the cursor to subsequent reference objects then click or press Enter. When all desired objects have been selected, right-click or press Esc.
- The text can now be initially positioned. Click or press Enter when the text is in the desired position to complete placement and exit placement mode.
When dimensioning an object, anchor points become available to you highlighting where the dimension can be attached. The point nearest the cursor will be the one used and where the dimension will attach if you proceed to click or press Enter.
At any time during placement, press the
Tab key to access the
Properties panel from where properties for the dimension can be changed on-the-fly. Pressing
Tab pauses placement, allowing you to interact with the panel (or other area of the software) directly. To resume, click the pause symbol that appears over the workspace or press
Esc.
Additional actions that can be performed during placement are:
- Press the + and - keys (on the numeric keypad) to cycle forward and backward through all visible layers in the design to change placement layer quickly.
- Press the Spacebar to rotate the dimension counterclockwise or Shift+Spacebar for clockwise rotation. Rotation is in accordance with the value for the Rotation Step defined on the PCB Editor – General page of the Preferences dialog.
Tips
- While attributes can be modified during placement (Tab to bring up the Properties panel), keep in mind that these will become the default settings for further placement unless the Permanent option on the PCB Editor – Defaults page of the Preferences dialog is enabled. When this option is enabled, changes made will affect only the object being placed and subsequent objects placed during the same placement session.
- Ordinate dimensions are group objects consisting of text and track segments. They can be converted to their set of primitive objects by choosing Tools » Convert » Explode Dimension to Free Primitives from the main menus. Once exploded, a dimension object can no longer be manipulated as a group object.