It seems that no browser supports resetClip it was added to the standards
March 2012 but for some reason not touched in webkit or firefox so I
wouldn't rely on it. It seems the only way is to save and restore state.
Sorry,
David Botton
On Sat, Feb 14, 2015 at 3:48 AM, Pascal <[email protected]> wrote:
> Hello,
>
> I want to create a clip area and then reset it. I'm confused about that.
> See:
> http://www.w3.org/TR/2dcontext/#clipping-region
> "The clip() method must create a new clipping region by calculating the
> intersection of the current clipping region and the area described by the
> path, using the non-zero winding number rule. Open subpaths must be
> implicitly closed when computing the clipping region, without affecting the
> actual subpaths. The new clipping region replaces the current
> clipping region."
>
> Actually the new clip region is not replacing the previous one but is
> adding to the previous one. See ยง3:
>
> http://www.rgraph.net/blog/2013/january/an-example-of-the-html5-canvas-clip-function.html
>
> As ResetClip is missing I have to play with save / restore.
>
> Source code that illustrate that, I draw 3 bars. One with a first clip
> region (left square box), One with a second clip region (right square box)
> and finally one with the original context:
>
> Context.Get_Drawing_Context_2D (App.My_Canvas);
> context.save;
> context.Stroke_Rectangle((100, 100, 100, 100));
> context.Stroke_Rectangle((150, 100, 100, 100));
> context.Begin_Path;
> context.Rectangle((100,100,100,100));
> context.Clip;
> context.Fill_Rectangle((50, 120, 250, 5));
> context.Begin_Path;
> context.Rectangle((150,100,100,100));
> context.Clip;
> context.Fill_Rectangle((50, 150, 250, 5));
> context.Restore;
> context.Fill_Rectangle((50, 180, 250, 5));
>
> See result:
>
> Is there something else easier?
>
> Thanks, Pascal.
> http://blady.pagesperso-orange.fr
>
>
>
>
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