Canvas (GUI): Difference between revisions
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* in [[Java (programming language)|Java]], the [[Java FX]] scene graph with 2D and 3D functionality |
* in [[Java (programming language)|Java]], the [[Java FX]] scene graph with 2D and 3D functionality |
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* in [[Tcl]] and other languages such as [[Perl]], [[Python (programming language)|Python]] ([[Tkinter]]), and [[Ruby (programming language)|Ruby]], the [[Tk (software)|Tk toolkit]] provides a <code>canvas</code> widget for 2D graphics <ref>http://www.tkdocs.com/tutorial/canvas.html</ref> <ref>http://tcl.tk/man/tcl8.6/TkCmd/canvas.htm</ref> |
* in [[Tcl]] and other languages such as [[Perl]], [[Python (programming language)|Python]] ([[Tkinter]]), and [[Ruby (programming language)|Ruby]], the [[Tk (software)|Tk toolkit]] provides a <code>canvas</code> widget for 2D graphics <ref>http://www.tkdocs.com/tutorial/canvas.html</ref> <ref>http://tcl.tk/man/tcl8.6/TkCmd/canvas.htm</ref> |
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* in [[Tcl]]<ref>http://wiki.tcl.tk/2798</ref> and other languages such as [[Perl]]<ref>http://search.cpan.org/~zincdev/tk-zinc-3.303/</ref> and [[Python (programming language)|Python]]<ref>https://wiki.python.org/moin/TkZinc</ref>, [https://bitbucket.org/plecoanet/tkzinc TkZinc] is an extended replacement for the Tk canvas, which adds support for hierarchical grouping, clipping, affine transformations, anti-aliasing, and specific items for air traffic control. |
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Some canvas modules within various libraries do not provide the power of a full scene-graph - they operate at a lower level which requires programmers to provide code such as mapping mouse-clicks to objects in the canvas. Examples of libraries which include such a canvas module include: |
Some canvas modules within various libraries do not provide the power of a full scene-graph - they operate at a lower level which requires programmers to provide code such as mapping mouse-clicks to objects in the canvas. Examples of libraries which include such a canvas module include: |
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Revision as of 16:55, 4 March 2016
In computer science and visualization, a canvas is a container that holds various drawing elements (lines, shapes, text, frames containing other elements, etc.). It takes its name from the canvas used in visual arts. It is sometimes called a scene graph because it arranges the logical representation of a user interface or graphical scene. Some implementations also define the spatial representation and allow the user to interact with the elements via a graphical user interface.
See this article for an overview (2010-08-15) of a small handful of canvas implementations.
Library support
Various free and open-source canvas or scene-graph libraries allow developers to construct a user interface and/or user-interface elements for their computer programs.
Examples of free and open-source scene-graph canvas options include:
- in C, Evas from the Enlightenment project
- in C, Clutter, associated with the GNOME project
- in C, GTK+ Scene Graph Kit (GSK)
- in C, Pigment
- in C++ or optionally in Qt's own markup language QML: Qt Quick, provides a scenegraph associated with the Qt project
- in C++, OpenSceneGraph, a 3D graphics API using OpenGL
- in C++, the OGRE engine, based on a scene graph, supports multiple scene managers
- in C++, OpenSG, a scene-graph system for real-time graphics, with clustering support and multi-thread safety
- in C++, the FlightGear Flight Simulator uses a custom Canvas system (LGPL'ed via SimGear[1]) that is hardware-accelerated using OpenSceneGraph/OpenGL, OpenVG/ShivaVG:[2] The FlightGear Canvas system
- in Java, the Java FX scene graph with 2D and 3D functionality
- in Tcl and other languages such as Perl, Python (Tkinter), and Ruby, the Tk toolkit provides a
canvaswidget for 2D graphics [3] [4] - in Tcl[5] and other languages such as Perl[6] and Python[7], TkZinc is an extended replacement for the Tk canvas, which adds support for hierarchical grouping, clipping, affine transformations, anti-aliasing, and specific items for air traffic control.
Some canvas modules within various libraries do not provide the power of a full scene-graph - they operate at a lower level which requires programmers to provide code such as mapping mouse-clicks to objects in the canvas. Examples of libraries which include such a canvas module include:
- in C++, KDE Plasma Workspaces Corona canvas
- the Canvas element in HTML5
- for Java, the AWT library Canvas
- for Java, the Java FX library Canvas
- for Java, the Swing library Canvas
- for Java, the SWT library Canvas, associated with Eclipse
- for Java-like JavaScript, the GWT library Canvas
- for Tcl/Tk, the canvas widget
- for Python, the Tkinter library canvas
- in C++, the papyrus Canvas library which renders using the Cairo (graphics) library
- in C, crcanvas, a GTK+ canvas widget which renders using the Cairo (graphics) library
- in C, GooCanvas, a GTK+ canvas widget which renders using the Cairo (graphics) library
Proprietary canvas libraries include, for example: