[sip-comm-dev] [GSoC] Whiteboard Status


#1

Hi all,
Here my weekly whiteboard plugin status,
I still work on the drawing system of the whiteboard (jabber-svg-message
send/receive system are done)
Currently the hardest work is to integrate Bézier curves and elliptical
arcs:
it's all shapes with controls points (in this case a SVG-lib would be
useful)

A cubic Bézier segment is defined by a start point, an end point, and two
control points.
The cubic Bézier commands are C and S (c and s for relative coordinates).

a quick description:
*C
name : curveto
Parameters : (x1 y1 x2 y2 x y)+
Description : Draws a cubic Bézier curve from the current point to (x,y)
using (x1,y1) as the control point at the beginning of the curve and (x2,y2)
as the control point at the end of the curve. Multiple sets of coordinates
may be specified to draw a polybézier. At the end of the command, the new
current point becomes the final (x,y) coordinate pair used in the
polybézier.

*S
name : shorthand/smooth curveto
Parameters : (x2 y2 x y)+
Description : Draws a cubic Bézier curve from the current point to
(x,y). The first control point is assumed to be the reflection of the second
control point on the previous command relative to the current point. (If
there is no previous command or if the previous command was not an C, c, S
or s, assume the first control point is coincident with the current point.)
(x2,y2) is the second control point ( i.e., the control point at the end of
the curve). Multiple sets of coordinates may be specified to draw a
polybézier. At the end of the command, the new current point becomes the
final (x,y) coordinate pair used in the polybézier.

For exemple:
<path d="M100,200 C100,100 250,100 250,200 S400,300 400,200" />
result : http://caotic.free.fr/whiteboard/cubic01.svg

(more informations this WE)

Julien