You can constrain your lines to be strictly vertical or strictly horizontal by holding down the Shift key as you draw them; they will snap to preset angles for perfect right angles or perfect diagonals.
By Adrien-Luc Sanders, About.com Guide
You can constrain your lines to be strictly vertical or strictly horizontal by holding down the Shift key as you draw them; they will snap to preset angles for perfect right angles or perfect diagonals.
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