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authormensonge <mensonge@b3834d28-1941-0410-a4f8-b48e95affb8f>2008-11-14 15:39:19 +0000
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Minor fix: Remove DOJO library (60Mo) replaced by link to Google CDN (online DOJO library)
git-svn-id: https://semanticscuttle.svn.sourceforge.net/svnroot/semanticscuttle/trunk@159 b3834d28-1941-0410-a4f8-b48e95affb8f
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-dojox.gfx
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-Version 1.100
-Release date: 08/01/2006
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-Project state:
-beta
-HTMLCanvas renderer: experimental
--------------------------------------------------------------------------------
-Credits
- Eugene Lazutkin (eugene.lazutkin@gmail.com)
- Kun Xi (bookstack@gmail.com)
- Chris Mitchell (ccmitchellusa@gmail.com) HTML Canvas
--------------------------------------------------------------------------------
-Project description
-
-Implementation of simple portable 2D graphics library.
--------------------------------------------------------------------------------
-Dependencies:
-
-Dojo Core
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-Documentation
-
-Currently it can be found here: http://docs.google.com/Doc?id=d764479_1hnb2tn
-
-HTMLCanvas Renderer Status
-
-To use canvas rendering, insert 'canvas' at the beginning of the gfxRenderers list in your
-djConfig, for example:
-<script type="text/javascript" src="../../../dojo/dojo.js"
- djConfig="parseOnLoad: true, gfxRenderer: 'canvas,svg,silverlight,vml'"></script>
-canvas currently will only render on non-IE browsers (see dojox/gfx.js for where the renderer is loaded);
-although it should be possible to use an IE canvas implementation (like Google's); however, it will be very slow.
-
-The following tests can be made to work with HTML Canvas with minor testcase modification:
-dojox/gfx/tests
- test_gfx.html-Bugs #1
- test_arc.html
- test_bezier.html
- test_pattern.html
- test_gradient.html
- test_linearGradient.html
- test_image1.html - Limitation #3
- test_transform.html - Bug #1
- test_poly.html - Bug #1
-dojox/gfx/demos
- butterfly.html - Bug #1
- lion.html - Bug #1
- tiger.html - Bug #1
- circles.html - No event processing yet :(
- creator.html
-dojox/chart
- test_pie2d.html - Dojo Charts on iPhone anyone? :)
- test_chart2d.html -
-
- // To make charts work, the following line needs to be added to the end of the
- // Chart2D.js render() method (prior to return)
- if(this.surface.render){this.surface.render()};
-
-Known Limitations:
-1) event handling- plan is to capture all events at canvas, perform intersect/hit
- tests (not implemented) against scene graph, then propogate event to top-most
- intersected shape. HtmlCanvas shape need intersectsStroke and intersectsBounds,
- and intersects (region).
-2) SVG and VML are "live" scene graphs; eg. any state change to objects in the
- scene automatically get rendered in next engine render pass. For canvas, it's
- procedural, and current implementation requires application to call surface.render()
- whenever scene needs to be updated. Plan is to do dirty region checking based
- on bounding boxes (currently not properly computed), and track dirty areas anytime
- state changes (invalidate) separate from render phase.
- Add the following call where changes to the scene graph are complete and you want to
- render:
-
- if (surface.render){surface.render();}
-
-4) Text/Text Paths - Text shape is implemented using DIV overlays. Many text styles are not
- applied, and outline/fills are not possible. This is due to limitations in Canvas spec.
- Firefox 3.0 has proprietary text functions that we could test for and use once FF3 is out.
- No luck on Safari.
-3) No Image skewing - Limitation of Canvas
-
-Known Bugs:
-1) Matrix xformations (applied from root to shape leaf nodes) not quite right--but very close.
- Canvas does not have a built in transformation function that allows skewing. Need to
- track skew matrix with Shape, and perform other trans/rot/scale transformations without
- using canvas transform functions.
-
-
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-Installation instructions
-
-Grab the following from the Dojo SVN Repository:
-http://svn.dojotoolkit.org/var/src/dojo/dojox/trunk/gfx.js
-http://svn.dojotoolkit.org/var/src/dojo/dojox/trunk/gfx/*
-
-Install into the following directory structure:
-/dojox/gfx/
-
-...which should be at the same level as your Dojo checkout.
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