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Datum Datum
Datum constructs a series of single dimensions, each one being measured from a common datum point. You may dimension any graphics which have the status of hittable or editable.
Select the command. You are prompted to give a position on screen through which the first dimension line will run (dimension lines are drawn parallel to the X-axis). Further dimension lines will be automatically spaced relative to the first one. Next pick a point to dimension from, using snapcodes to ensure accuracy. This is the datum point from which all dimensions will be measured. Then pick a point to dimension to. Keep clicking on further points to create further dimensions. Each new point is measured relative to the datum. If you make a mistake inputting a point you may remove it using the Backspace key. Press Enter when you have finished.
Having constructed a set of dimensions, they form a single item that can be picked up and copied/moved/deleted as a single item. To pick up the dimension set, click anywhere on the leader lines, or click on the dimension line anywhere except on its grab handle.
The dimension graphics consist of lines (the dimension and leader lines), text (the dimension text), and points (the dimension arrow). Their properties, such as font and Pen, may be changed as normal. The dimension arrow is the Symbol item called DimArrow, located in the "(standard)" Named Object Library.
The dimension line may be moved closer to or further from the items you have dimensioned, by picking it up by its grab handle. (The leader lines are stretched or shortened accordingly.)
The leader lines may be stretched or shortened by clicking on and moving their relevant vertex point (which is not at the end of the line, but offset from it).
Dimensions are dynamic - if you move a leader line (by its vertex) the dimension value will be updated accordingly.
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