Activities/Ruler
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Where to get Ruler
About Ruler
Ruler is a simple collection of measurement tools that are displayed on the screen.
CM and MM scales
CM and MM grid
angles
checkerboard
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.
Toolbar
From left to right:
- Activity menu button
- CM and MM ruler
- CM and MM grid
- Angles (protractor)
- Checkerboard
- Dots per inch (DPI) spinner – used to set the display DPI – only appears when DPI is not known, e.g., non-OLPC-XO hardware
- Stop button (not shown)