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Activities/Turtle Art-0.86 (view source)
Revision as of 18:01, 10 February 2009
, 18:01, 10 February 2009→Palettes
* Angles are degrees from 0 to 360 (for larger values and smaller values all multiples of 360 are subtracted or added to get the value into the range 0..360).
* Angles are degrees from 0 to 360 (for larger values and smaller values all multiples of 360 are subtracted or added to get the value into the range 0..360).
::Examples: 90 means a right angle (90 degrees), clockwise; –30 means a 30-degree angle, counterclockwise
::Examples: 90 means a right angle (90 degrees), clockwise; –30 means a 30-degree angle, counterclockwise
===The Pen Palette (cyan)===
====examples====
====descriptions====
* Pen Up – turtle will not draw when moved
* Pen Down – turtle will draw when moved
* Set Pen Size(number) – set size of the line drawn by the turtle
* Set Color(number) – set color of the line drawn by the turtle
* Set Shade(number) – set shade of the line drawn by the turtle
* Fill Screen(color,shade) – fills the background with (color, shade)
* Pen state values (can plug into a parameter)
** Pen size, color, shade
** Colors and shades are represented by a number from 0 through 99. Using a number outside of this range is allowed, and will cause the value to be "wrapped around" (via a modulo, or "clock arithmetic" operation) to the 0 – 99 range. Color specifies a hue and shade specifies an admixture of white or black to the color.
===The Numbers Palette (purple)===
====examples====
====descriptions====
*Values (can plug into a parameter)
**Number (constant)
**Infix operators(left,right)
*** +, –, *, /, mod
**Random(min, max) (constants or boxes only)
*Conditions (oval, plugs into an If blocks on the Flow Palette)
** <, >, = (takes two constants or boxes)
** and, or, not (takes other conditions)
*Print(number) - Debugging output. When in full-screen mode ('''Alt-Enter'''), show a numeric value at the bottom of the screen.
===The Sensors and Keyboard Palette (red)===
====examples====
====descriptions====
*volume
*pitch
*voltage – (As read from mic in on the OLPC-XO-1 laptop)
*resistance – (As read from the mic in on the OLPC-XO-1 laptop)
More details on how to use the sensors can be found on the [http://wiki.laptop.org/go/Measure Measure] Activity page.
===The Flow Palette (orange)===
====examples====
====descriptions====
*Wait(number) – wait specified number of seconds
*Forever[stack] – (no continuation)
*Repeat(number)[stack] – loop specified number of times
*If(condition)[then] – uses boolean operators from Numbers palette
*If(condition)[then][else] – uses boolean operators from Numbers palette
*Stop (no continuation)
*Connectors:
**jog right
**jog down
===The My Blocks Palette (yellow)===
====examples====
====descriptions====
*Stack1,2 – a rhombus which tops a stack, equivalent to a procedure definition (but without parameters).
*"Stack1,2" – blocks for invoking a stack (no parameters)
*Store in "box" 1,2(n) – blocks for setting a variable
*"Box1,2" (plugs into a parameter)
==Save As Toolbar==
The Project tab (at the top left of the toolbar) has a button to access sample programs shipped with the Activity. It also has a export button to save the project into the Journal as a [[Berkeley Logo]] session (logosession.lg),
[[Category:Activity]]