Implement canvas for drawing pages about curie HOT 9 CLOSED

StayerX, would you like to start this one?

This might be a helpful start: Using Clutter and Champlain to display map.

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Then we can look at adding new navigation using buttons on the canvas itself to solve #61. I'm trying to find an example of a UI that does that.

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@StayerX, another direction that might be helpful would be to write a small script that renders a Cairo::ImageSurface to a Clutter::Stage. Then the ideas from the script can be brought into the rest of the code.

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@StayerX, I found this script which shows how to load an image into Clutter. It uses Imager to read in the data, but we don't need that part. All we need is a Cairo::ImageSurface. I thought it looked neat, so I wanted to share.

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More Clutter code : 2eb3854

It is part of #75.

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1. Start with PageDrawingArea Glade file
2. Instead of GtkDrawingArea, we need GtkClutterEmbed
3. Draw the first page as a Cairo::ImageSurface

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Very soon Gtk+ will have a built-in scene graph library which we can use. Search for GSK on the roadmap and the post here.

Just some notes:

• Inkscape uses a canvas that was forked off of GnomeCanvas, but since that is only Gtk2, we can not use it.
• Julia's Immerse.jl has a canvas, but it is just a GtkDrawingArea
• We need to support interactive things on the canvas such as text entry and rubber band selection.
• GooCanvas doesn't have active development.
• PiTiVi went from using GooCanvas to Clutter for its timeline then later dropped Clutter for a plain GTK+ timeline.
• Glob uses GooCanvas.
• The Clutter documentation needs a lot of work.

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Note: Clutter is in maintenance mode and will not be updated with new features.

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Closed by #237, #238, #239.

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