Canvas Element

Canvas - the FlightGear 2D drawing API
Canvas - Main Page Canvas News - for the latest developments Shiva Alternatives - ongoing work for Core Profile support Canvas Efforts - projects using the Canvas system Canvas FAQs - frequently asked questions Canvas - Getting started Canvas Development (core) Canvas Troubleshooting (core) Canvas Sandbox (core) PUI2Canvas (PUI/XML Parser) Canvas GUI Canvas Widgets Canvas Maps Canvas Snippets
RFC
Canvas Instancing Howto:New Canvas Execution Model Canvas SVG Canvas Popout Windows Canvas Scenery Overlays
Frameworks
Canvas Map API (soon deprecated!) Canvas MapStructure Canvas MapStructure Layers MapStructure Snippets Canvas Radar Canvas Animation Framework (WIP) Canvas Plotting Framework (WIP) Canvas MFD Framework Canvas ND Framework Canvas PFD Framework Canvas MCDU Framework Canvas EFB Framework Canvas Wrappers Canvas Glass Cockpit Efforts
Tutorials
Howto:Getting started with Canvas Howto: Canvas Troubleshooting Howto:Adding a canvas to a GUI dialog (PUI!) Howto:Creating a Canvas GUI dialog file (New) Howto:Dynamic Liveries via Canvas (new) Howto:Creating a Canvas GUI Widget Howto:Add a 2D canvas instrument to your aircraft Howto:Parsing 2D Instruments using the Canvas Howto:Creating fullscreen Canvas applications Howto:Use SVG inside a Canvas Howto:Extend the Canvas SVG module Howto:Serializing a Canvas to SVG Howto:Canvas applications as Nasal submodules Howto:Using raster images and nested canvases Canvas HUD Howto:Project 3D to 2D coordinates on desktop canvas
Reference
Canvas Element Group Image Map Path Text Canvas Nasal API MessageBox Layout System Canvas GUI API Canvas draw library Event Handling
Related
Canvas Properties Unifying the 2D rendering backend via canvas Howto:Use a Camera View in an Instrument Howto:Extending Canvas to support rendering 3D models Howto:Extending Canvas to support MathGL
To be ported
Navigation display Map FGCanvas Canvas Nasal/JavaScript Subset
Deprecated by Canvas
Complex Glass Cockpit Avionics
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A handful of rendering primitives are available to draw on a canvas. Properties (see Property Tree for general information on FlightGear's property system) are used to control the appearance and behaviour of such Elements.

Properties

clip

• Format: "auto" | "rect(<top>, <right>, <bottom>, <left>)"
• Default: "auto"

Set clipping rectangle for element and all its children. Only what is inside the clipping bounds will be shown.

# set clipping rectangle with x=10, y=5, width=90, height=45
el.set("clip", "rect(5, 100, 50, 10)");

clip-frame

• Format: GLOBAL | PARENT | LOCAL
• Default: GLOBAL

Set the coordinate reference frame for the clip property.

# set clip reference frame to parent coordinate frame
el.set("clip-frame", canvas.Element.PARENT);

z-index

• Format: <number> (Integer)
• Default: 0

Change order in which elements are drawn. Elements with higher z-index are drawn later and cover allready drawn elements on overlapping parts.

# Draw before all elements (if no z-index of the other elements is lower than zero)
el.set("z-index", -1);

# Ensure el2 is drawn before/below el1
el1.set("z-index", 51);
el2.set("z-index", 50);