Now that you have created a guide layer, you can draw out your guidelines.
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Click once on the guide layer. The Pencil icon that appears next to the name indicates that the layer is active and ready for editing.
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Choose the Line tool from the drawing toolbar.
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Select the Line Color button and, from the pop-up color picker, choose white (see figure 02:07).
Figure 02:07.
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Draw a straight line down the stage. Hold the Shift key down as you draw to ensure a straight line. The line size doesn't matter; you'll adjust that next.
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While the line is selected, choose Window > Inspectors > Object to open the Object Inspector. Alternatively, you can use the keyboard shortcut Ctrl-Alt-I / Cmd-Option-I.
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Enter 10 in the x (horizontal) field and in the y (vertical) field. This moves the line 10 pixels from the left, creating a margin.
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Enter 400 in the h (height) field to match the dimensions of the stage (see figure 02:08).
Figure 02:08.
Notice that the line, when deselected, is the color of your guide layer outline boxin this case, blue. You can set that color by double-clicking on the Guide Layer icon and selecting the Color tab.
Now the idea is to repeat this process in order to define a 10-pixel margin around the stage as well as a center point.
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Select the line and choose Edit > Copy or use the keyboard shortcut Ctrl-C / Cmd-C.
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Paste the line by selecting Edit > Paste (Ctrl-V / Cmd-V).
The line is pasted in the center of the stagewhich is exactly where you need a line for your center axis.
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Duplicate the selected center line by choosing Edit > Duplicate or by pressing the keyboard shortcut Ctrl-D / Cmd-D.
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In the still-open Object Inspector, move the newly created line to the right margin by changing the x value to 540 10 pixels fewer than the stage's width, (550)and the y value to 0.