On Sun, Mar 23, 2008 at 11:54 AM, Miguel BYRAM <migounanounet@...400...> wrote:

Diederik,

Thanks for your answer

On Sun, Mar 23, 2008 at 4:20 AM, Diederik van Lierop <mail@...1689...> wrote:

Hi Miguel,

Your proposal makes sense to me. Have you already thought about how to
implement the UI for this?

Yes I do. I think about a keycombination while someone drag the node and a up-down value item into the node toolbar to modify the amount of "solidarity" between the node and its handles.

Finally, perhaps the key combination is not possible. Alt, CTRL & Shift are allready used.
Another solution could be the right button dragging. Will it be difficult to implement ?
Is it possible with the GTK version used in Inkscape ?

Have a look in src/nodepath.cpp, for example node_request(),
sp_node_selected_move(), sp_nodepath_move_node_and_handles(), etc.
You'll probably figure it out from there.

I looked in all those function and it help me a lot in my understanding of the node's move.
It seems that I got to make a node-sculpt similar function except that I got to set the dragged node's type to NODE_CUSP, the other nodes act the same way than in the node-sculpt.

I made what I said : a function similar to sp_node_selected_sculpt call sp_node_selected_needlelize. At present time it only move the dragged node without moving the other selected nodes or modifying their handles.

I want to make curve the segment before and after the draged point to get the spaghetti effect (see below) but, when I call sp_nodepath_set_line_type() it doesn't set the handle the same way than when I press the "set to curve the selected segment" button in the toolbar.
So, to understand what it's done when I press the button, and then reproduce it before the drag, I want to know where can I find the code describing the toolbar ?

I join the 2 little functions created to needlelize a node.

Regards,
Miguel

Regards,

Diederik

Miguel BYRAM wrote:
> Hi,
>
> I'm a Inkscape user for 3 or 4 years and first of all I want to thank
> and congratulate U for this program.
> I'm also a C++ beginner developer and I want to implement a
> functionality. It's about the moving of nodes.
>
> In Inkscape, at present, when U move a node toward a vector V1, his
> handles (bezier indicators) move with the same vector V1.
> What I want to do is to add the possibility to move a node with V1 while
> his handles move with f*V1 where 0.0 <= f <= 1.0
> As if U put a spaghetti on a table, U took it near the middle and pull
> it up.
>
> This could be very useful to draw a sun or a hair shape.
>
> As I said earlier, I'm a C++ beginner. I just succeeded in compiling
> Inkscape using Eclipse under Ubuntu but I don't know where to modify, or
> search... even where to look at, to understand how the node's moving
> works presently.
>
> So here are my questions :
>
> 1. Did I made myself clear ? English is not my mother tongue (so please
> pardon me for faults) and before going further I want U to understand my
> proposition.
>
> 2. Could someone lead me or just show me where to look at to understand
> the Inkscape architecture and more specifically the node's moving ?
>
> Thanks.
>
> ..miguel..
>
>

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