Perimeter Tool
View tab
Measurement shows:
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Distance: As you are drawing the current section of a set of lines it dynamically shows its length so far.
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Angle: This shows the angle of the first line section related to the X axis; for following line sections it shows the angle relative to the previous section. No signs or directions of rotating are considered.
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Perimeter: The total length of the line set is dynamically displayed as you are drawing it. If you use a shortcut menu to complete drawing with an open shape, the total line set length is shown. If you double-click to form a polygon, its perimeter is shown.
In Cursor Location, the X and Y coordinates of the current cursor position are dynamically displayed relating to the start points of the current line section. No signs are considered.
Setting tab
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Perpendicular Measurement sets your lines to be drawn orthogonally (at right angles relative to the X or Y axis).This does not affect lines already drawn, nor concern the last automatically drawn edge of the polygon. You can change this option midway during a measurement.
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Units Settings allows you to set the scaling for your measurement. See under Distance tool dialog box. A scale that is set applies to all measuring tools until it is changed.
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In the Snap Settings area you can specify that your measuring should snap to points, edges or arcs in your document. Adjust snap sensitivity and color.
Markup tab
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Use Markup: Choose this to store the current and future measurements with your PDF document, otherwise all results are lost as soon as you start a new measurement. Enter a text into the text field to appear in a pop-up comment window when you hover the cursor over any line in the shape.
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Measuring Color: Sets the color for your measuring lines.