X2o (activity): Difference between revisions
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Alexlevenson (talk | contribs) (Replacing page with 'Category:Gamescategory:softwarecategory:physicscategory:science {{olpcboxtop|toptext=[[{{PAGENAME}}|x2o]]}} {{ OBX activity | [[Image: Activity-physics.svg|40p...') |
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= x2o = |
= x2o = |
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adsf |
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[[Image:PhysicsElements.png|160px|left]] |
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Physics is a physical world simulator and playground -- you can add squares, circles, triangles, or '''draw your own shapes''', and see them come to life with forces (think '''gravity''', Newton!), friction ('''scrrrrape'''), and inertia (ahh, '''slow down'''!). |
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We also plan to add forces such as: magnetism, springs, and motors |
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== Shape Drawing == |
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[[Image:PhysicsTriangleDraw.png|160px]] [[Image:PhysicsSquareDrawing.png|160px]] [[Image:PhysicsCircleDrawing.png|160px]] |
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== Get Physics! == |
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Click this link in browse: [http://dev.laptop.org/~bjordan/Physics-0.2.xo Physics-0.2.xo] |
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''OR'' (for the newest version...) |
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Open up the Terminal activity and follow these steps: |
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sudo yum install git |
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cd ~/Activities/ |
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git clone git://dev.laptop.org/activities/physics |
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mv physics Physics.activity |
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# Then press ctrl + alt + erase to restart sugar. |
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# The newest version of physics is installed! (but may not be stable!) |
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===Old versions=== |
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[http://dev.laptop.org/~bjordan/Physics-0.1.xo Physics-0.1.xo] |
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=Usage= |
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==Drawing objects== |
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** '''Boxes''' |
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*** Non-rotated box of any dimension |
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*** Use: click (top-left corner) drag + release (bottom left corner) -- like dragging a selection box in a photo editor |
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** '''Circles''' |
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*** click (center) drag + release (outer edge) |
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** '''Triangles''' |
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*** Equilateral triangle of any size and rotation |
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*** Use: click (center of base) drag + release (tip) |
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** '''Polygons''' |
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*** Click for each point of the polygon |
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*** Use: Right click to end OR left click in the circle around the original point |
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** '''Magic Pen''' |
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*** Use: Click and hold to draw any shape you'd like! |
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==Using tools== |
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* '''Grab''' - Drag existing objects around with the mouse |
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* '''Connect''' |
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** Click on any object, drag to another object + release to create a distance joint |
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** Click on any object to add a revolute joint (like a push pin!) |
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* '''Destroy''' - Click on an object to destroy it, or draw a line of destruction--destroying everything in its path! |
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==Class Challenges== |
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===Egyptian Pyramid=== |
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How did the Egyptians build the pyramids using just human effort? They didn't have cranes, trucks or even cars. Make a block with a high mass and use a weak grab tool. How can you get it across the screen? |
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===Vertical Tennis=== |
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Can you use motors to make a device that hits a ball up and down? |
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=Plan to Add / Requests= |
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These are the features we would like to add, and if you think you can help us out please do! |
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#There are some tools that need to be added |
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#*fixate tool (object doesn't move / hangs in space) |
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#*More complex joint tool |
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#**Need to implement gears, motors, prismatic and revolute joints in elements (already implemented in Box2D) |
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#Need a way to change the properties of an object |
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#*density |
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#*rotation |
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#*strength (for breaking) |
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#*bounciness |
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#*friction |
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#*color |
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#More physics! |
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#*Joints + Motors |
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#*Magnetism |
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#*Springs -- via prismatic joints? |
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#*Breakable bodies |
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#*Note: We are using a ''rigid body simulator'' (box2D). All of the above need to be implemented using forces on rigid bodies. Breakable bodies can be achieved a few different ways: |
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#*#When a body 'breaks' it is removed from the physics engine and some kind of graphical animation indicates that it has been broken and dissipated |
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#*#When a body 'breaks' it is removed from the physics engine and is replaced by some new (smaller, fragment-like) rigid bodies (kind of like an explosion) |
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#*#When a body 'breaks' it is removed from the physics engine, it's shape is calculated and then split into smaller polygons which are then added as rigid bodies |
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#We need a way to save / export the state of a scene |
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#*Should set up a standard format for an elements scene |
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#Need to add objectives and limits |
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#*Incredible machine style objectives (get the ball into the basket, knock the triangle off the screen, etc) |
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#*You only have 4 boxes, 1 meter of magic pen, and one triangle, etc. |
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= Photographs = |
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[[Image:Housegolf.jpg|320px]] |
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[[Image:PhysicsNew3.png|320px]] [[Image:Bridgependulum.jpg|320px]] |
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[[Image:PhysicsMesh.jpg|320px]] [[Image:Physics-1.JPG|320px]] |
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[[Image:Physics-2.jpg|320px]] [[Image:Physics-3.jpg|320px]] |
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[[Image:PhysicsNew1.png|320px]] [[Image:PhysicsNew2.png|320px]] |
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