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→About Ruler
File:Ruler-fig3.png|angles
File:Ruler-fig3.png|angles
File:Ruler-fig4.png|checkerboard
File:Ruler-fig4.png|checkerboard
<gallery>
</gallery>
Since the OLPC XO computer has a 200 DPI display, the rulers are quite accurate. One other hardware, where the display resolution is not known, their is a spinner to let the user set the DPI. Ruler saves this value to the Journal, so it need not be set on subsequent uses of the Activity.
Since the OLPC XO computer has a 200 DPI display, the rulers are quite accurate. One other hardware, where the display resolution is not known, their is a spinner to let the user set the DPI. Ruler saves this value to the Journal, so it need not be set on subsequent uses of the Activity.