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Line 1: − === Introduction ===+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + − + + + + + + + − {|+ − ! Format !! Bit rate !! Recommended tools !! Max. size+ − |-+ − | [http://en.wikipedia.org/wiki/Vorbis OGG Vorbis]+ − | ???+ − | [http://audacity.sourceforge.net/ Audacity]+ − | 3~4MB − |- − } + − === Video ===+ + + +
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<noinclude>{{GoogleTrans-en}}{{TOCright}}</noinclude>
=== Introduction ===
Two main goals should be kept in mind when creating Karma lessons:
# they should be easy to adapt
# they should run on as much hardware as possibe with OLPC's XO-1 laptop representing the baseline
=== General Notes ===
==== Hardware constraints ====
Since a large percentage (if not the majority) of Karma users are envisioned to be using OLPC XO-1 laptops, netbooks, older hardware or generally relatively slow systems there are several performance constraints that need to be taken into account when designing Karma lessons.
* CPU/Memory: The baseline regarding available performance is the XO-1 laptop which comes with an AMD Geode LX 433MHz CPU and 256MB RAM ([http://wiki.sugarlabs.org/go/Karma/Specifications full specifications]). This limits the use of high-resolution multimedia, animations and videos to some degree.
* Display: Karma lessons should work well on displays with a resolution of 1024*768 (whereby a part of the display may be taken up by browser UI elements!).
* Mass storage: Since especially the XO-1 laptop only has very limited local mass storage (1GB) lessons should be kept reasonably small.
* Connectivity: Karma lessons must not assume constant connectivity with a locally (e.g. [http://wiki.laptop.org/go/School_server XS]) or globally available server. Support for storing data locally will be provided by Karma.
==== Accessibility ====
Follow best practices for accessibility (e.g. example of a [http://northtemple.com/1608 checklist]), especially with regard to [http://en.wikipedia.org/wiki/Color_blindness colorblindness].
=== HTML ===
* <!DOCTYPE HTML>
=== JavaScript ===
* ...
=== Animations ===
* Format(s): TBD
* Recommended tools: TBD
* Notes: TBD
The Karma animations are created using JavScript and the Karma plugin. At this moment we haven't defined a mechanism to "export" (and "import") one animation. But copying and pasting the code (of the animation) will be enough in most cases.
=== Images ===
=== Images ===
* Format(s): [http://en.wikipedia.org/wiki/JPEG JPEG], [http://en.wikipedia.org/wiki/Portable_Network_Graphics PNG], [http://en.wikipedia.org/wiki/Scalable_Vector_Graphics SVG] '''(Note 1, 2 and 3)'''
* Recommended tools: [http://www.inkscape.org/ Inkscape], [http://www.gimp.org/ GIMP], [http://www.adobe.com/products/illustrator/ Adobe Illustrator] (non-free), [http://www.corel.com CorelDRAW] (non-free)
* Max. resolution: 1200*900 px
* Notes:
#To handle SVG files will be necessary to create a parser svg2canvas in order to introduce them as objects inside canvas element.
#Animated SVG content will be hard to reproduce using canvas.
#SVG animations seems slow under the XO-1 (Tested with [http://raphaeljs.com/ RaphaelJS] and Browse)
=== Sound ===
=== Sound ===
* Format(s): [http://en.wikipedia.org/wiki/Vorbis OGG Vorbis] (Note 1)
* Bit rate: TBD
* Max. size per lesson: 3~4MB
* Recommended tools: [http://audacity.sourceforge.net/ Audacity]
* Notes:
# https://developer.mozilla.org/En/Media_formats_supported_by_the_audio_and_video_elements
=== Video ===
* Format(s): TBD (Note 1)
* Recommended tools: TBD
* Notes: TBD
# https://developer.mozilla.org/En/Media_formats_supported_by_the_audio_and_video_elements