Activities/Physics: Difference between revisions

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== 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.

*A cyclic mechanism for lifting balls from the bottom of the screen to the top, again and again.

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|'''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

[https://github.com/sugarlabs/physics git repository on GitHub]

= Development =

[[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==

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* [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://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]

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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-tracing.png|thumb|none|280px|Tracing multiple objects]]
+|+
+|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]]
+|+
+|valign="top"|[[File:Chain.png|thumb|none|280px|a chain generated in Turtle Art]]
 |}
 == 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.
 *A cyclic mechanism for lifting balls from the bottom of the screen to the top, again and again.
@@ Line 92: / Line 99: @@
 |'''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.
 |}
+== 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
+[https://github.com/sugarlabs/physics git repository on GitHub]
 = Development =
 [[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==
@@ Line 214: / Line 264: @@
 * [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://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]