Canvas (elemento HTML): differenze tra le versioni

Versione delle 16:59, 14 mar 2007

Versione delle 00:08, 15 mar 2007

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'''Canvas''' è una estensione dell'[[HTML]] standard <!--che thatpermette allowsil forrendering dynamicdinamico renderingdi ofimmagini [[Scripting language|scriptable]] [[bitmap]] images.

Fu inizialmente introdotta da [[Apple Computer|Apple]] per uso all'interno del loro componente [[Mac OS X]] [[Webkit]], per migliorare applicazioni come [[Dashboard (software)|Dashboard]] widgets ed il browser [[Safari (browser)|Safari]].

Più tardi fu adottata dai browsers [[Gecko (layout engine)|Gecko]] ([[Mozilla Application Suite|Mozilla]] e [[Mozilla Firefox|Firefox]]) ed [[Opera (internet suite)|Opera]]<ref>[http://www.opera.com/docs/changelogs/windows/900/ Opera 9.0 changelog]</ref>, e standardizzati dal [[Web Hypertext Application Technology Working Group|WHATWG]] su nuove specifiche proposte per le tecnologie della prossima generazione.

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It was initially introduced by [[Apple Computer|Apple]] for use inside their own [[Mac OS X]] [[Webkit]] component, powering applications like [[Dashboard (software)|Dashboard]] widgets and the [[Safari (browser)|Safari]] browser. Later, it was adopted by [[Gecko (layout engine)|Gecko]] browsers (notably [[Mozilla Application Suite|Mozilla]] and [[Mozilla Firefox|Firefox]]) and [[Opera (internet suite)|Opera]]<ref>[http://www.opera.com/docs/changelogs/windows/900/ Opera 9.0 changelog]</ref>, and standardized by the [[Web Hypertext Application Technology Working Group|WHATWG]] on new proposed specifications for next generation web technologies. [[Novell]] manufactures an [[XForms]] processor plugin for [[Internet Explorer]], which also provides support for the canvas element.<ref>[http://lab.cph.novell.com/nxie/ Novell XForms Explorer]</ref> Independent efforts to support the canvas feature on Internet Explorer do not require plugins and are based solely on [[Vector Markup Language|VML]] and [[JavaScript]].<ref>[http://me.eae.net/archive/2005/12/29/canvas-in-ie/ Canvas in IE]</ref> Google has also begun a project to add canvas abilities to Internet Explorer using the same techniques.<ref>[http://excanvas.sourceforge.net/ Google's Canvas in IE project]</ref>

that allows for dynamic rendering of [[Scripting language|scriptable]] [[bitmap]] images.

It was initially introduced by [[Apple Computer|Apple]] for use inside their own [[Mac OS X]] [[Webkit]] component, powering applications like [[Dashboard (software)|Dashboard]] widgets and the [[Safari (browser)|Safari]] browser.

Later, it was adopted by [[Gecko (layout engine)|Gecko]] browsers (notably [[Mozilla Application Suite|Mozilla]] and [[Mozilla Firefox|Firefox]]) and [[Opera (internet suite)|Opera]]<ref>[http://www.opera.com/docs/changelogs/windows/900/ Opera 9.0 changelog]</ref>, and standardized by the [[Web Hypertext Application Technology Working Group|WHATWG]] on new proposed specifications for next generation web technologies.

It was initially introduced by [[Apple Computer|Apple]] for use inside their own [[Mac OS X]] [[Webkit]] component, powering applications like [[Dashboard (software)|Dashboard]] widgets and the [[Safari (browser)|Safari]] browser. Later, it was adopted by [[Gecko (layout engine)|Gecko]] browsers (notably [[Mozilla Application Suite|Mozilla]] and [[Mozilla Firefox|Firefox]]) and [[Opera (internet suite)|Opera]]<ref>[http://www.opera.com/docs/changelogs/windows/900/ Opera 9.0 changelog]</ref>, and standardized by the [[Web Hypertext Application Technology Working Group|WHATWG]] on new proposed specifications for next generation web technologies. [[Novell]] manufactures an [[XForms]] processor plugin for [[Internet Explorer]], which also provides support for the canvas element.<ref>[http://lab.cph.novell.com/nxie/ Novell XForms Explorer]</ref> Independent efforts to support the canvas feature on Internet Explorer do not require plugins and are based solely on [[Vector Markup Language|VML]] and [[JavaScript]].<ref>[http://me.eae.net/archive/2005/12/29/canvas-in-ie/ Canvas in IE]</ref> Google has also begun a project to add canvas abilities to Internet Explorer using the same techniques.<ref>[http://excanvas.sourceforge.net/ Google's Canvas in IE project]</ref>

Canvas consists of a drawable region defined in HTML code with ''height'' and ''width'' attributes. [[JavaScript]] code may access the area through a full set of drawing functions similar to other common 2D APIs, thus allowing for dynamically generated graphics. Some anticipated uses of the canvas include building graphs, animations, and image composition.-->