Bruce wrote:
To do this to a non-orthogonal line is a bit more of an effort. You need to get the perpendicular snap guide showing up, then:
1. Hover over this snap guide (dark mercedes cursor)
2. Type your distance, then TAB (not + / -)
3. Hit escape or pan in window.
Takes a bit of getting used to, but depending on what you're doing, can be faster than guide lines.
Just to add a bit more explanation to Bruce's method for the "less initiated"
:
The way you can get a Snap Guide perpendicular to an element edge quickly show up is to hover over either end node of the given element edge and press Q, which will immediately highlight the node as a Snap Reference Point (with a light blue circle).
The you can move your cursor away from the element edge perpendicular to the Snap Reference Point you just marked and the perpendicular Snap Guide will be offered by ARCHICAD. Then you can do steps 1, 2 and 3.
The reason this works is because when you type a value while your cursor is over the perpendicular Snap Guide, the distance will be automatically measured from the marked Snap Reference Point (which is the end point of the element edge), so any value you type is measured from that point.
When you press TAB the next field in the Tracker is activated and the value you types into the Distance field is now noted by ARCHICAD. If you now press the Esc key or Pan, ARCHICAD considers that you have finished your input in the Tracker and uses that distance value you types. So it measures that Distance along the Perpendicular Snap Guide and draws a Snap Guide Circle with the specified radius and also draws a parallel (offset) Snap Guide at the specified distance along the perpendicular Snap Guide.
Sounds a bit complicated when you read it but if you try it once you will immediately see what all these words are trying to describe.
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