From Sugar Labs

Contents 1 Turtle Art 1.1 Introduction 1.2 What is new for users 1.3 What is new for developers 1.4 Internationalization (i18n) and Localization (l10n) 1.5 Compatibility 1.6 Detailed changes 1.7 Open tickets 1.8 Credits

Turtle Art

Introduction

Turtle Art is an activity with a Logo-inspired graphical "turtle" that draws colorful art based on snap-together visual programming elements.

Turtle Art is intended to be a stepping stone to the Logo programming language, but there are many restrictions compared to Logo. (Only numeric global variables and stack items are available, no lists or other data-structures. The conditionals and some of the functions only take constants or variables, not expressions. Limited screen real-estate makes building large programs unfeasible.) However, you can export your Turtle Art creations to Berkley Logo. The sensor-enabled version of Turtle Art also has a facility for sensor input, so, for example, you can move the Turtle based upon sound volume or pitch.

Turtle Art is in the same tradition as Etoys, Scratch, Lego Mindstorms™, and Lego Microworlds™.

Turtle Art is used extensively in Sugar deployments and numerous materials for support in the classroom have been developed. Of course, since Turtle Art is a Logo derivative, many of the classic Logo exercises are well suited for engaging students in Turtle Art. For example, Bill Kerr has been blogging about the experiences of his students trying to tackle Barry Newell worksheet of 40 geometric shapes to be rendered using turtle graphics.

More Info:

• Turtle Art Sugar Activity homepage
• Turtle Art gallery (See [1])
• Turtle Art Manual (See [2])
• Turtle Art teacher guides from Uruguay (See [3])
• Turtle Art teacher guides from Peru (See [4])
• Turtle Art student guide (See [5])
• Tony Forster blog on Turtle Art (See [6])
• Bill Kerr blog on Turtle Art (See [7])
• Barry Newell worksheet (See [8])

What is new for users

The most visible change is the incorporation of the new Sugar Toolbar design.

Minor bugs and feature changes include:

73

• raise status flag when catching overflow error
• clean up of de, it, fr, es artwork
• fixed bug related to blocks running off the left edge
• cleaned up command-line code

72

• cleaned up code for pre-0.86 palettes
• fixed keyboard shortcut bug in pre-0.86 palettes
• fixed problem with int(None) in unselect
• fixed problem with int(float) in unselect
• fixed fence-post problem with searching off the end of blocks
• work-around Rainbow problem with tmpfile

71

• updated fr translations
• more sample Python code
• limiting abs(number) to max of 1000000 to prevent OverflowErrors

70

• new translations/artwork for vi, it, fr
• added linewrap to help label (with rgs)
• added label to Help toolbar (to work around bug with small displays)
• caught some exceptions that prevented TA from running outside of Sugar
• fixed bug preventing simple save to HTML for pre-086 systems
• added missing icon for Save from Journal

69

• chmod +x svg factory
• added missing import gettext from talogo.py
• renamed xo-man to xo-child
• caught missing attribute when running from outside of Sugar
• new translations/artwork for de, fr, es, it
• added translator comments
• fixed several bugs in export to Logo code

68

• made case consistent on tool tips
• fixed bug re i18n in debug panel
• new artwork for es and fr
• fixed some problems with svg factory
• fixed bug in Export HTML
• fixed naming problem with all save_as functions
• fixed bug in Export Logo in regard to start block

67

• added mime-type icon
• changed keyboard shortcuts to use Ctrl instead of Alt as per guidelines
• fixed bug re wait time (now in seconds)
• fixed problem with fractional wait times
• fixed i18n problem with labels in hover help
• reorganization of extras palette
• fixed problem of empty file with "Save as HTML" (saving screen capture)

66

• fixed bug preventing launch on (0.82-0.84)
• work around Rainbow problem with Save as image
• fixed bug re activate Stop Button on launch (thanks to rgs)
• added open from journal button (with rgs)
• fixed bug re Erase Button (hides status blocks)
• cleaned up some broken sample code

65

• fixed problem with View Toolbar
• moved Samples button to Help Toolbar

64

• major refactoring for new toolbar design
• stop sign turns off after execution is finished
• added preliminary support for mg and ta
• moved hover help to help toolbar
• adjusted artwork on Turtle palette

63

• more sample programs
• consolidated samples into one directory
• fixed mask bug that prevented palette hiding

62

• first pass at hover help support (thanks Raul)
• put samples button, keep button on project toolbar
• fixed journal icons associated with html, python, logo
• improved compatibility with old Sugar builds
• images centered under turtle
• text vertically centered under turtle
• pop blocks snap into boxes
• improved masks for fewer block-selection errors

61

• fixed es translation
• fixed problem with save/load on old systems

60

• fixed sharing bug
• began work on 701 backward compatibility
• added more debugging code

59

• fixed leading bug for OLPC XO portfolio
• enabled box to hold strings and journal objects

58

• fixed unicode string compare in equal block
• fixed journal description bug introduced in v55
• fixed misaligned myfunc block problem

57

• lots of artwork clean up
• elimination of lock block
• more dead key clean ups
• truncated strings

56

• more dead key cleanup
• empty (undefined) box error message

55

• dead key workaround

54

• debug button
• no more decimals by default for print

53

• es updates

52

• first attempt at fixing the mimetypes
• default behavior of tamyblock.py is to draw a dotted line

51

• caught ISO_Level3_Shift problem on OLPC XO keyboard

50

• fixed some problems with taexportlogo
• cleaned up save/load icons
• print uses title for Journal objects
• cleaned up movie window destroy code
• more consistent template management internally
• support of a sort for show in taexporthtml

49

• fixed character input bug

48

• reworking of media blocks
• json cleanup

What is new for developers

The good news is that contributions are coming in from multiple sources. In particular, many thanks to Raúl Gutiérrez Segalés, who has contributed many patches. Raúl and I are working on a roadmap for a major refactoring for 0.88 which will include a block factory--a more object-oriented approach that should facilitate a more decentralized development approach.

Internationalization (i18n) and Localization (l10n)

We now have support for:

• mg
• ta

Note: The artwork will be reworked once the translation team completes its work.

Compatibility

Compatible with all versions of Sugar although some functionality is lost with pre-0.82 versions.

Detailed changes

Version 71

• #893 Show multimedia tile to support text formats
• #490 Turtle Art should close video window properly
• #343 Turtle Art doesn't start on amd64 due to 32bit alsaaudio.so in bundle
• #389 Turtle Art with sensors needs special alsaaudio.so on XO
• #451 Rainbow problem copying module from Journal to data directory
• #590 Turtle Art user-defined block feedback
• #672 Export picture as pdf or png
• #774 Keep Error: json.encode() does not exist
• #883 TAPortfolio fails to keep the current project
• #894 Set scale is done in the object chooser tile should be in show tile?
• #1054 TA Text input brick, text should be right aligned (or keep cursor in view)
• #1056 TA showing Journal object (image) should be centered and rotated
• #1084 Usability enhancements for Turtle Art
• #1186 turtle art variables are not being saved
• #1205 Turtle Art not starting
• #1269 Strings in turtleart-activity.po in Fructose 0.84 need to have comments/notations for terms that should not be translated
• #1290 Turtle Art is using <Ctrl><Shift>+Q for Quit, should be <Ctrl>+Q
• #1331 Rainbow problem with Turtle Art save image
• #127 Turtle Art: Demo images not centered when first loaded
• #241 [portfolio] slide titles, stack labels and variable names do not truncate
• #549 Turtle Art, implement canvas scrollbars
• #1288 Key accelerators are all <Alt>, HIG specifies <Ctrl> is the default modifier
• #1073 Units of wait brick smaller than seconds
• #1424 Long help strings can't be seen at all
• #1425 Should the 'Hide blocks' button hide the blocks palette as well?
• #1426 lots of missing strings for spanish (probably for all other languages)
• #1455 int overflow crashes Turtle Art

Open tickets

• #472 Remove unexpected 'save/load' tab from toolbar
• #489 Turtle Art text entry should use Entry widget
• #673 Logo program should be displayable in the document View Source
• #1057 Turtle Art feature to add support for "pages"
• #1188 Load samples from turtleart.org
• #1203 Rebase Turtle Art graphics on Cairo
• #155 Turtle Art with Sensors has different requirements for non-XO hardware
• #491 Turtle Art sharing needs new logic
• #548 Turtle Art: read and write to text file
• #552 Turtle art: reinstate sensor input

Credits

• Walter Bender and Raúl Gutiérrez Segalés (with help from Simon Schampijer)
• Especially helpful community feedback from Tony Forster and Bill Kerr
• Brian Silverman is the first author of Turtle Art