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authormensonge <mensonge@b3834d28-1941-0410-a4f8-b48e95affb8f>2008-11-13 09:49:11 +0000
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New feature: basic Ajax suggestion for tags and implementation of Dojo toolkit
git-svn-id: https://semanticscuttle.svn.sourceforge.net/svnroot/semanticscuttle/trunk@151 b3834d28-1941-0410-a4f8-b48e95affb8f
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+-------------------------------------------------------------------------------
+dojox.gfx
+-------------------------------------------------------------------------------
+Version 1.100
+Release date: 08/01/2006
+-------------------------------------------------------------------------------
+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
+-------------------------------------------------------------------------------
+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.
+
+
+-------------------------------------------------------------------------------
+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.
+-------------------------------------------------------------------------------