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-
- NOTE: I am no longer actively developing GooCanvas, so no major new
- features will be added (unless a new maintainer takes over). I'll still
- try to fix any bugs that appear though, and may accept minor patches.
-
-
- Bugs:
-
- o I need to check the bounds are being calculated correctly so that they
- are correct for all zoom settings. Since cairo uses fixed point maths
- and I think only calculates up to a certain tolerance there might be
- slight errors in our gdouble results. So as the canvas is scaled this
- could eventually lead to the bounds being a pixel out, leading to painting
- errors. Maybe we should extend any bounds returned from cairo slightly to
- cover the maximum possible errors.
-
-
- Features definitely needed:
-
- o API for modifying GooCanvasPath data.
- o Editable text item - a port of GtkTextView.
-
- o Need a function to setup a given cairo context with the defaults settings
- of a GooCanvas, e.g. default line width.
-
- o Check canvas and all items can be completely configured with properties
- so that GtkBuilder can be used to load hierarchies of items/models.
- Add "root-item" and "root-item-model" properties? Will GtkBuilder be able
- to handle the tree of items/models like that? What about GUI builders?
- How can gradients be specified by object properties?
-
-
- Possible additional features:
-
- o Need a way to efficiently notify items about changes in canvas scale, if
- they request it. Could use something similar to the update flags.
-
- o Change GooCanvasStyle so it doesn't expose GValues in the API.
- Use get/set_boolean/int/double/boxed() instead.
-
- o Drag-and-Drop - probably copy all the GTK+ widget signals so items can
- implement their own behavior.
-
- o Caching of rendered items to improve performance. Items would have a cache
- option with choices like Never, Always and WhenVisible.
- But don't use caches when printing.
- o Filters like in SVG, to add graphical effects.
- o Support using the same item in different places, like SVG 'use'.
- o Support using system color names, like SVG, e.g. "ActiveBorder".
- This helps you write widget-like items that fit in with the rest of GTK+.
- o "scale-line-width" boolean property to specify if the line width scales
- with the canvas? The item bounds will change at different scale settings.
- o Arrows on path items, just like on polyline.
-
-
- Requests from GTK+ people:
-
- o Use separate GooCanvasContainer[Model] interfaces? May help bindings.
- o GooCanvasWidget width & height are redundant - use widget's requested size.
- o Make PathCommand and LineDash structs opaque.
- o Use floating flag and sink() for objects.
- o Use 1-byte integer percentage for xalign/yalign instead of doubles?
- o Make it easy to add a border and background to items. "border-width",
- "border-color" and "background-color" properties? Might also need "x-pad",
- "y-pad", "x-radius", "y-radius" etc. Maybe have a related border item.
- Note that we only have the bounds in device coords, so drawing a border of
- a rotated item would be awkward. (Maybe we store the user bounds somewhere.)
- o Link/URL item, or enable URLs in the markup of text items.
- o A button item, with different children displayed for different states,
- maybe with optional automatic prelighting.
-
-