Wt support HTML5 Canvas in WPaintedWidget
I am using only FF and Chrome
http://www.w3schools.com/html5/html5_ref_canvas.asp
HTML5 canvas.getContext("2d") gives the context and
imgData=ctx.getImageData(0,0,canvas.width,canvas.height);
red = imgData.data[0];
green= imgData.data[1];
blue = imgData.data[2];
alpha= imgData.data[3];
If i have mousePosition from wt
WMouseEvent event
imgDataFromWt =ctx.getImageData(event.widget().x, event.widget().y, 1, 1);
This psudeo code is not possible because I can access a ctx from Wt
Also this isnt a good idea.
Is there any better way to do this in Wt??
On Sun, Jul 29, 2012 at 12:03 AM, Spatial Minds <
[email protected]> wrote:
> If you use an rtree index of the lake MBR you can perform the hit test on
> the original polygons quite fast.
>
> Craig
>
>
>
> On Jul 28, 2012, at 10:33 AM, Mohammed Rashad <[email protected]>
> wrote:
>
> All,
>
> subject says it all. I have draw some complex shapes using WPainterPath in
> a WPaintedWidget
>
> for(int i=0; i< n; i++)
> painter.drawPath(path[i])
>
> path is array of WPainterPath
>
> WPainterPath path[size];
>
> using mouse how can I select a shape.?
>
> How to get the path instance from clicking on the shape using Wt?
>
> Is that possible?
>
> i can connect mouseWentUp signal to some function called mouseUp
>
> and that also have a WMouseEvent parameter
>
> using that i can get the x and y like
>
> event.widget().x
> event.widget().y
>
> Since the shapes are complex eg: waterbodies/lakes
>
> Its not a good practice to search through each shape using some
> PointInPolygon algorithm
>
> and all shapes are not same in appearance and number of shapes will be in
> the order of 100 or 1000
>
> Any hep is very much appreciated.
>
> --
> Regards,
> Rashad
>
>
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--
Regards,
Rashad
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Exclusive live event will cover all the ways today's security and
threat landscape has changed and how IT managers can respond. Discussions
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