Difference between revisions of "Karma/Specifications"
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==== Accessibility ==== | ==== 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 === | === Animations === | ||
| Line 42: | Line 50: | ||
=== Sound === | === Sound === | ||
| − | * Format(s): [http://en.wikipedia.org/wiki/Vorbis OGG Vorbis] | + | * Format(s): [http://en.wikipedia.org/wiki/Vorbis OGG Vorbis] (Note 1) |
* Bit rate: TBD | * Bit rate: TBD | ||
* Max. size per lesson: 3~4MB | * Max. size per lesson: 3~4MB | ||
* Recommended tools: [http://audacity.sourceforge.net/ Audacity] | * Recommended tools: [http://audacity.sourceforge.net/ Audacity] | ||
| − | * Notes: | + | * Notes: |
| + | # https://developer.mozilla.org/En/Media_formats_supported_by_the_audio_and_video_elements | ||
=== Video === | === Video === | ||
| − | * Format(s): TBD | + | * Format(s): TBD (Note 1) |
* Recommended tools: TBD | * Recommended tools: TBD | ||
* Notes: TBD | * Notes: TBD | ||
| − | + | # https://developer.mozilla.org/En/Media_formats_supported_by_the_audio_and_video_elements | |
Latest revision as of 03:53, 25 August 2009
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 (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. 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 checklist), especially with regard to 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
- Format(s): JPEG, PNG, SVG (Note 1, 2 and 3)
- Recommended tools: Inkscape, GIMP, Adobe Illustrator (non-free), 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 RaphaelJS and Browse)
Sound
- Format(s): OGG Vorbis (Note 1)
- Bit rate: TBD
- Max. size per lesson: 3~4MB
- Recommended tools: Audacity
- Notes:
Video
- Format(s): TBD (Note 1)
- Recommended tools: TBD
- Notes: TBD