[nodejs] [ANN] openvg-canvas - Hardware accelerated HTML5 canvas on the Raspberry Pi

On Oct 20, 2012, at 8:45 PM, Luis Reis wrote:

Hi all,

I've just published on npm the openvg-canvas module. It allows you to use the Raspberry Pi's GPU as a HTML5 Canvas. It works on top of OpenVG which, I believe, is also available on android.

Current code, details and implementation status are available on https://github.com/luismreis/node-openvg-canvas.

This library was used to power the LXJS tweetwall and although it isn't complete it is already very usable. It supports truetype fonts via freetype (currently only dejavu fonts which are bundled on the raspbian distribution) and images through FreeImage.

Comments and contributions are appreciated.

Cheers,
Luis Reis
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On Sunday, 21 October 2012 13:45:22 UTC+13, Luis Reis wrote:

Hi all,

I've just published on npm the openvg-canvas module. It allows you to use
the Raspberry Pi's GPU as a HTML5 Canvas. It works on top of OpenVG which,
I believe, is also available on android.

Current code, details and implementation status are available on
https://github.com/luismreis/node-openvg-canvas.

This library was used to power the LXJS tweetwall and although it isn't
complete it is already very usable. It supports truetype fonts via freetype
(currently only dejavu fonts which are bundled on the raspbian
distribution) and images through FreeImage.

Comments and contributions are appreciated.

Cheers,
Luis Reis
--

Thanks, examples work on my Raspberry Pi.
Trying to interop with node-easel, not successful so far.


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On Thursday, 7 March 2013 23:53:31 UTC+13, Luis Reis wrote:

Hi Kevin,

Can you tell me more about the problems you're having ?

I'd like to take a look at that.

Best,
Luis

Luis
--



On Fri, Mar 1, 2013 at 12:47 AM, Kevin Donnelly <kevin.l....@gmail.com<javascript:>

This example has error

require('node-easel');
var Stage = createjs.Stage;
var Shape = createjs.Shape;
var Canvas = require('../lib/canvas'); //openvg canvas

//Create the canvas to draw to
var canvas = new Canvas(350, 350);
var stage = new createjs.Stage(canvas);

//Create graphics object
var shape = new createjs.Shape();
shape.graphics.beginFill("#FF0000").drawCircle(0,0,50);
stage.addChild(shape);
stage.tick();



../bin/node-canvas bball3.js
node: /home/pi/.node-gyp/0.8.20/src/node_object_wrap.h:61: static T*
node::ObjectWrap::Unwrap(v8::Handle<v8::Object>) [with T = Context2d]:
Assertion `handle->InternalFieldCount() > 0' failed.

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So this allows you to "draw" to the ras-pi screen from node as if it were
a HTML5 canvas?

If so thats prity amazingly impressive :) Is there such a thing that
allows you to treat the screen output as just one big non-interactive
webpage? i saw node-gtk & node-qt but they look a bit complex and i already
know HTML

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On Wed, May 1, 2013 at 8:19 PM, Mark Losey wrote:


Works great on my PI. A newbie with nodejs but is it possible to write
video to this canvas while animating other stuff over the top of the video?

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On Saturday, October 20, 2012 5:45:22 PM UTC-7, Luis Reis wrote:

Hi all,

I've just published on npm the openvg-canvas module. It allows you to use
the Raspberry Pi's GPU as a HTML5 Canvas. It works on top of OpenVG which,
I believe, is also available on android.

Current code, details and implementation status are available on
https://github.com/luismreis/node-openvg-canvas.

This library was used to power the LXJS tweetwall and although it isn't
complete it is already very usable. It supports truetype fonts via freetype
(currently only dejavu fonts which are bundled on the raspbian
distribution) and images through FreeImage.

Comments and contributions are appreciated.

Cheers,
Luis Reis
--

On Saturday, 20 October 2012 20:45:22 UTC-4, Luis Reis wrote:

Hi all,

I've just published on npm the openvg-canvas module. It allows you to use
the Raspberry Pi's GPU as a HTML5 Canvas. It works on top of OpenVG which,
I believe, is also available on android.

Current code, details and implementation status are available on
https://github.com/luismreis/node-openvg-canvas.

This library was used to power the LXJS tweetwall and although it isn't
complete it is already very usable. It supports truetype fonts via freetype
(currently only dejavu fonts which are bundled on the raspbian
distribution) and images through FreeImage.

Comments and contributions are appreciated.

Cheers,
Luis Reis
--

On Wednesday, 4 September 2013 15:09:09 UTC-4, Chad Engler wrote:

Is webgl not an option?



-Chad



*From:* nod...@googlegroups.com <javascript:> [mailto:
nod...@googlegroups.com <javascript:>] *On Behalf Of *Greg Braman
*Sent:* Wednesday, September 04, 2013 8:16 AM
*To:* nod...@googlegroups.com <javascript:>
*Subject:* [nodejs] Re: [ANN] openvg-canvas - Hardware accelerated HTML5
canvas on the Raspberry Pi



Hi all,



Quick question. Can I use openvg-canvas to load a remote *.js file over
http? I would like to dynamically update the canvas with images that are
added on-the-fly, and would like to load the javascript from a web
application instead of locally (I want to leverage the hardware
acceleration of openvg-canvas because the browser canvas is too slow). Do
you know if this is possible?



Thanks.

On Saturday, 20 October 2012 20:45:22 UTC-4, Luis Reis wrote:

Hi all,



I've just published on npm the openvg-canvas module. It allows you to use
the Raspberry Pi's GPU as a HTML5 Canvas. It works on top of OpenVG which,
I believe, is also available on android.



Current code, details and implementation status are available on
https://github.com/luismreis/node-openvg-canvas.



This library was used to power the LXJS tweetwall and although it isn't
complete it is already very usable. It supports truetype fonts via freetype
(currently only dejavu fonts which are bundled on the raspbian
distribution) and images through FreeImage.



Comments and contributions are appreciated.



Cheers,

Luis Reis

--





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On Wed, Sep 4, 2013 at 9:09 PM, Chad Engler wrote:

Is webgl not an option?****

** **

-Chad****

** **

*From:* nodejs@googlegroups.com *On
Behalf Of *Greg Braman
*Sent:* Wednesday, September 04, 2013 8:16 AM
*To:* nodejs@googlegroups.com
*Subject:* [nodejs] Re: [ANN] openvg-canvas - Hardware accelerated HTML5
canvas on the Raspberry Pi****

** **

Hi all,****

** **

Quick question. Can I use openvg-canvas to load a remote *.js file over
http? I would like to dynamically update the canvas with images that are
added on-the-fly, and would like to load the javascript from a web
application instead of locally (I want to leverage the hardware
acceleration of openvg-canvas because the browser canvas is too slow). Do
you know if this is possible?****

** **

Thanks.

On Saturday, 20 October 2012 20:45:22 UTC-4, Luis Reis wrote:****

Hi all,****

** **

I've just published on npm the openvg-canvas module. It allows you to use
the Raspberry Pi's GPU as a HTML5 Canvas. It works on top of OpenVG which,
I believe, is also available on android.****

** **

Current code, details and implementation status are available on
https://github.com/luismreis/node-openvg-canvas.****

** **

This library was used to power the LXJS tweetwall and although it isn't
complete it is already very usable. It supports truetype fonts via freetype
(currently only dejavu fonts which are bundled on the raspbian
distribution) and images through FreeImage.****

** **

Comments and contributions are appreciated.****

** **

Cheers,
****

Luis Reis****

-- ****

** **

** **

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On Wed, Sep 4, 2013 at 5:16 PM, Greg Braman wrote:

Hi all,

Quick question. Can I use openvg-canvas to load a remote *.js file over
http? I would like to dynamically update the canvas with images that are
added on-the-fly, and would like to load the javascript from a web
application instead of locally (I want to leverage the hardware
acceleration of openvg-canvas because the browser canvas is too slow). Do
you know if this is possible?

Thanks.

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