Pivot Line Tool
The Pivot Line tool is intended to aid in the creation of perspective grids. If you are tracing a photograph, you will probably draw two lines over the drawing and then use the Trim tool to trim them to their common intersection. This will be the vanishing point, and often it will be completely off the page. Once you have the two lines projecting off to the vanishing points, for two- or three-point perspective, then you can use the Pivot Line tool to duplicate these lines in one operation.
You have a choice of fixed or interactive length. If you select the fixed length option, then the new line will be the same length as the original line. If you select the interactive length option, then the new line will extent to the location of the cursor in the drawing.
Use the Shift key to switch between interactive and fixed length.
You may use the Option key to switch from which end of the line that you are pivoting about, or from the center of the line.
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