Customize menu > Preferences > Preference Settings dialog > Viewports tab > Mouse Control group > Stroke
Strokes are a way to assign command shortcuts to mouse (or tablet) stroke patterns. Strokes require a three-button mouse, or the equivalent in a digitizing tablet. If you don't have a three-button mouse, you can still use some strokes by using the Strokes utility.
Important: Before you can use any stroke feature, you must specify the Stroke option for the middle mouse button in the Viewports panel of the Customize menu > Preferences dialog. See the following procedure, “To activate the Strokes feature.”
Important: You can also assign keyboard shortcuts to frequently used commands, but strokes are convenient because they can select an object and apply a command to it.
Important: For example, you can assign Arc Rotate to a downward stroke. When you draw this stroke the software changes to Arc Rotate mode. You can assign a circular stroke to the Hide Selected command so that it both selects the objects and then hides all the objects in the bounding extents of the stroke pattern.
The same stroke pattern can perform four different functions by holding the SHIFT, ALT, or SHIFT+ALT keys when drawing the stroke:
To activate the Strokes feature:
This procedure is required both for strokes using the middle mouse button and for the Strokes utility, which uses the left mouse button.
Choose Customize menu > Preferences > Preference Settings dialog > Viewports tab.
In the Mouse Control group on the Viewports panel, turn on Stroke.
You must turn this option on for all Stroke functions to work. If you switch back to the Pan/Zoom option, remember to reactivate the Strokes option when you want to use strokes.
To assign properties to a stroke:
Choose Customize menu > Preferences > Preference Settings dialog > Viewports tab.
In the Mouse Control group on the Viewports panel, turn on Stroke.
Hold down CTRL, and drag from top to bottom and then back up to the starting point.
The Define Stroke dialog appears and the name of the stroke is "HKKH."
If an alert appears, you've either drawn the stroke incorrectly, or this stroke has already been assigned. Continue with the following steps to replace the defined stroke.
Choose the Properties command from the Command to Execute list.
The option enabled is Single Object at Start of Stroke, because that's the logical choice for the Object Properties command.
Click OK.
Drag vertically down and back up over any object in the scene to display the Object Properties dialog for that object.
Example: To assign Hide Selection to a stroke:
Click the Draw Strokes button if it's not already green.
Hold down CTRL, and drag an L shape (drag vertically from top to bottom, and then continue from left to right).
In the alert that appears, click Yes to redefine the stroke and display the Define Stroke dialog.
The name of this stroke is GJEF.
Choose Hide Selection from the list.
Choose All Objects in Rectangular Extents, and then choose Crossing.
Click OK.
Load a scene containing several objects.
Drag an L shape that crosses and encloses some objects in the scene.
The stroked objects are all hidden.
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