Re: diacanvas2

[Rick L Vinyard Jr <rvinyard cs nmsu edu>]

Pavlo Korzhyk wrote:
> But rotations

In the Drawable class (which most classes such as Shape, Rectangle, Arc, 
Group, Polyline, Bezierline....) inherit from:
/** Rotate to r radians */
void set_rotate( double r );

/** Rotate by r radians
 * If previous rotation was pr then new rotation is pr+r
 */
void rotate( double r );

> , movements, 
Same Drawable class:

/** Set absolute position */
void set_translate_x( double tx );
void set_translate_y( double ty );
void set_translate( double tx, double ty );

/** Translate by given value */
void translate_x( double tx );
void translate_y( double ty );
void translate( double tx, double ty );

And to round out affine transforms there are scaling methods and skewing 
methods.

But, if you're looking for animations, see the AffineAnimator class, 
with an example in the papyrus-demo named example_affineanimator.cpp

> doubleclicks, mouse selections etc are much more complex task for
> a developer.
These are handled by attaching an event handler to an object. With an 
event handler attached, which (intentionally) handles most of the Gdk 
events that I felt were appropriate for drawing operations. But, if 
anyone feels some are missing it wouldn't be too hard to add them.

example_selector.cpp, example_translator.cpp and 
example_freehandsketcher.cpp have examples which capture Gtk window events.

> DiaSolver is probably a thingy that simplifies automatic updates of 
> links between objects.
That's one area I've been thinking about... nothing concrete yet though.