I need a modification on the application that will only allow the user to
draw WHITE filled objects on top of ONLY BLACK FILLED objects. The white
objects must overlap at least at one point with a black filled object
otherwise an error message should appear, or not draw the object at all.
Basically i need to forbid the user of drawing invinsible objects(
white-on-white), or (black on black).

The objects must overlap at least at some point otherwise this must be
forbidden.

Do you have any suggestions?

I know my question is nearly impossible to answer but i though i try all
available avenues for help. I am also offering payment if someone figures
this out(i dont know if its forbidden to state this here, if it is just
ignore me!:P).

Your requirements are a bit vague: what happens with the stroke color?
Should it take into account layers? Should it take into account the color
of the background? How are you limiting the colors to black and white? If I
select the rectangle tool, start dragging from a "banned" area, but the end
of the drag in an "allowed" area, should the rectangle still be created?

A very basic implementation of what you're trying to achieve can be done by
adding these lines at lne 2357 of svgcanvas.js:

var hitColor = evt.target.getAttribute("fill");
 var currentColor = document.querySelector("#fill_color
rect").getAttribute("fill");
if (hitColor === currentColor) {
                        alert("same color");
return;

Mark

On Tue, Nov 13, 2012 at 12:24 AM, nicholaskyriakides <