Center of Rotation

A Quick Guide for Etoys on the OLPC XO

Guides about topics in EToys Help screens for the OLPC XO machine. NavBar    Keep Find Projects    Choose a Language Paint    Brushes    Color Palette    Bucket Tool    Straight Line Tool    Ellipse Tool    Rectangle Tool    Polygon Tool    Color Picker    Stamps Tool Halo    Make the Handles Show    Viewer of Script Tiles    Size Color Copy    Move and Pick Up    Rotate Handle    Trash    Arrow at Center    Center of Rotation    Menu Tools    Make a Script Tile    Collapse    Color Property Sheet Supplies    Object Catalog    Text    All Scripts    Joystick Control    Sound Recorder ObjectCat    Slider Bar    Grab Patch Tool    Lasso Tool    Digital Images    Maker Button Books    Top Border Icons    Expanded Controls    Working with Layers    Navigation Tiles ScriptTile    Forward by    Turn by    Bounce Motion    X and Y Tiles    Pen Use    Playfield Trail    Stamps    Heading    Scale Factor    Hide and Show    World Input    Sound Category    Random Numbers    Exact Location    Width Length    Foward and Turn    Tests Category Menu    Normal Ticking    Viewer Icons Set    Scriptor Icons Set    Button Fires a Script    Grab Me Reveal Me    Watchers    Playfield Graph Paper

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Squeak Etoys is a "media authoring tool"-- software that you can download to your computer
and then use to create your own media. You can write out your project and share it with others.
Etoys runs on any Mac or Windows machine, as well as on the OLPC XO machine.
It is free.    Find out about Etoys.

Text of this guide (for searching): Halo Tools: Center of Rotation Every object has a center of rotation. The center can be moved to any place on the screen. Click the green clock to start the script. Open a halo for the bot's left arm and find the center-of-rotation handle, a small blue circle with red crosshairs inside. Hold down the Shift key and drag the red + to a new place. For objects that are not Sketches, rotate the blue Halo handle to see the direction and center controls. + The red + marks the bot's new center of rotation. The center of rotation can be far from the center of the drawing. Click the green clock to try this script.