Re: Writing a simple vector graphics editor - how to implement?
Re: Writing a simple vector graphics editor - how to implement?
- Subject: Re: Writing a simple vector graphics editor - how to implement?
- From: Wim Lewis <email@hidden>
- Date: Wed, 05 Oct 2011 13:08:34 -0700
On 5 Oct 2011, at 12:39 PM, Nick wrote:
> I have a task to write a simple vector graphics editor, which has a window, a sheet (which can be bigger than the window), and some objects [...] I need an advice how would experienced developers implement this basic functionality.
>
[....]
> What I mean is to what extent can I use Cocoa primitives for these objects
> and the sheet itself? And what I will have to implement "by hand"?
>
> Could you please give me a basic idea of how such kind of editors are
> usually implemented? If there are some simple opensource programs, I'd be
> thankful for their names.
The "Sketch" example that comes with Xcode should be a decent example of this, I think.
Using views for canvas objects is a little too "heavyweight" for a normal drawing program. Instead, I would make the canvas be a single view, containing an NSArray of (non-NSView) objects; the canvas's drawRect calls a method like -drawInView:self on each of the objects; any time an object is changed, there needs to be some way for the canvas to -setNeedsDisplay: on both the old and new bounds.
Scrolling can be done simply by placing the canvas view into an NSScollView though.
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