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Line 264: − + − * [http://bugs.sugarlabs.org/query?component=Physics&groupdesc=1&group=resolution&col=id&col=summary&col=owner&col=type&col=status&col=priority&col=milestone&col=time&col=changetime&col=reporter&order=priority Bug tracker]
→Resources
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|valign="top"|[[Image:physics_pen.png|thumb|none|280px|Example illustrating the pen tool attached to the end of a pendulum.]]
|valign="top"|[[Image:physics_pen.png|thumb|none|280px|Example illustrating the pen tool attached to the end of a pendulum.]]
|valign="top"|[[Image:physics-tracing.png|thumb|none|280px|Tracing multiple objects]]
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|valign="top"|[[File:TAGearTA.png|thumb|none|280px|A simple gear and motor generated in Turtle Art]]
|valign="top"|[[File:TAGear.png|thumb|none|280px|rendered in Physics]]
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|valign="top"|[[File:Chain.png|thumb|none|280px|a chain generated in Turtle Art]]
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== Ideas to try ==
== Ideas to try ==
*Build a catapult to simulate Angry Birds
*Build a machine that sorts different sized balls in to two buckets, large and small, with no ball jams.
*Build a machine that sorts different sized balls in to two buckets, large and small, with no ball jams.
*A cyclic mechanism for lifting balls from the bottom of the screen to the top, again and again.
*A cyclic mechanism for lifting balls from the bottom of the screen to the top, again and again.
|'''Hints and tips''': Single clicking (no drag) with the circle, triangle or box tool, will add a default sized shape. Once you have used a shape tool, it remembers the last shape you made with it, a single click will add a clone of that last shape.
|'''Hints and tips''': Single clicking (no drag) with the circle, triangle or box tool, will add a default sized shape. Once you have used a shape tool, it remembers the last shape you made with it, a single click will add a clone of that last shape.
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== Did you know? ==
There is a Plugin for [[Activities/TurtleArt|Turtle Blocks]] that lets you create projects for the Physics Activity:
[[File:Physics pallette.jpg]]
Use these blocks to create objects that are added to the bodylist and jointlist of a Box2d database used by the Physics Activity. Objects are positioned by the turtle x,y and colored based on the current pen attributes. From left to right:
* density: set the object density (0 is light; 1 is heavy)
* friction: set the object friction (0 is slippery; 1 is sticky)
* bounciness: set the object restitution (0 is rigid; 1 is bouncy)
* start polygon: use the current turtle x,y position to specify the first vertex of a polygon
* add point: use the current turtle x,y position to add a vertex to a polygon
* end polygon: use the current turtle x,y position to specify the last vertex of a polygon
* end filled polygon: use the current turtle x,y position to specify the last vertex of a ''filled'' polygon
: '''Note:''' The polygon must be 'normal', e.g., no crossed lines; no holes. Since Box2d does not support concave polygons, all polygons are converted to triangles (triangulation). (In Turtle Blocks, these triangles are shown by slight variations in color.)
* triangle: add a triangle object at the current turtle x,y position
* circle: add a circle object at the current turtle x,y position
* rectangle: add a rectangle object at the current turtle x,y position
* gear: add a gear object at the current turtle x,y position with the number of teeth as the argument
* gear radius: returns the radius of a gear with the number of teeth as the argument (useful for positioning gears)
* motor: add a motor at the current turtle x,y position (attached to the object at this position)
* pin: add a pin at the current turtle x,y position (attached to the object at this position) to prevent movement
* pen: add a pen at the current turtle x,y position (attached to the object at this position) to trace motion
* joint: add a joint between the object at the current turtle x,y position and the object at x, y
* save as Physics project: save the current bodylist and jointlist as a Physics project in the Journal
'''Note:''' The current model is cleared whenever the Erase button is pressed or a Clean block is run.
===== Examples =====
'''For Turtle Blocks versions 107 - 183'''
[[File:TAgear.ta]] [[File:Gear.physics]]
'''For Turtle Blocks verisons 184 - '''
[http://people.sugarlabs.org/walter/physics-plugin.tar.gz]
'''Chain'''
Turtle Blocks project file: [http://people.sugarlabs.org/walter/chain.tb]
===Downloads===
[[File:Physics-plugin.tar.gz]] Physics plugin
[http://github.com/walterbender/physics-plugin git repository]
= Development =
= Development =
[[Image:PhysicsElements.png|160px|right]]
[[Image:PhysicsElements.png|160px|right]]
There are quite a few code layers to contend with. A regular Python Activity acts as a Sugar wrapper to Physics which is written using OLPCGames which itself wraps Pygame, Physics then uses Elements as a wrapper for Box2D.
There are quite a few code layers to contend with. A regular Python Activity acts as a Sugar wrapper to Physics which is written using SugarGames which itself wraps Pygame, Physics then uses Elements as a wrapper for Box2D.
==Video==
==Video==
* [http://activities.sugarlabs.org/en-US/sugar/addon/4193 Activity bundle]
* [http://activities.sugarlabs.org/en-US/sugar/addon/4193 Activity bundle]
* [http://git.sugarlabs.org/projects/physics GIT repository]
* [https://github.com/sugarlabs/physics/ GIT repository]
* [http://download.sugarlabs.org/sources/honey/Physics/ Source tarball]
* [http://download.sugarlabs.org/sources/honey/Physics/ Source tarball]