Howto:Canvas Troubleshooting

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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Event Handling

Work in progress This article or section will be worked on in the upcoming hours or days. See history for the latest developments.

please keep in mind that you need to set up your z-index properly, or the corresponding group may not even receive any events due to overlapping stuff. — Hooray (Sat Jul 26). Re: Event Click Listener on SVG element. (powered by Instant-Cquotes)

Using Online Imagery

I'd try to troubleshoot this step-by-step, e.g.: use a static LOCAL raster image (on disk/in fgdata - e.g. a splash screen -if this doesn't work, your Canvas/Image isn't set up properly, check visibility and z-index) use a http URL (e.g. the google/flightgear logo - if this doesn't work, check for errors/networking issues) use a dynamically-built URL - if this doesn't work, check your URL building scheme — Hooray (Sat Aug 09). Re: Displaying Remote Images (from URL/API) on canvas/MapStr. (powered by Instant-Cquotes)

Textures not shown properly

For starters, I'd suggest to work with textures that can be more easily recognized, i.e. some checker pattern or red as a color, to see what could be going on - otherwise, there's too much guessing involved, which is tedious for us given that we don't have access to your aircraft. So if you are hoping for more specific advice, open the texture in GIMP/photoshop and use some pattern for each different face that we can more easliy identify to see what's going on — Hooray (Wed Sep 17). Re: Two Images to a Texture. (powered by Instant-Cquotes)

I'd just copy the livery texture to a new file and fill each part with a separate pattern/color to see what's going on - that will tell us if we can work around the issue by editing the model, the texture, the Nasal code - or if we need to look at the C++ code So far, this could be just a simple matter of changing scale/transforming the texture a bit (hopefully) — Hooray (Wed Sep 17). Re: Two Images to a Texture. (powered by Instant-Cquotes)