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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 |
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| Credits |
| Eugene Lazutkin (eugene.lazutkin@gmail.com) |
| Kun Xi (bookstack@gmail.com) |
| Chris Mitchell (ccmitchellusa@gmail.com) HTML Canvas |
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| Project description |
| |
| Implementation of simple portable 2D graphics library. |
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| 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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