[Chameleon] Rendering inverse ROI image

[Paul Spencer]

Jan,

The ROI image is rendered in a script called ROIRenderer.php.  It is 
drawn as a separate image and overlayed on the map image in the client. 
  It should be possible to make the change you are doing.

The ROI tools can be put into different modes using an ROIMode widget. 
Specifically, you will need to draw a large rectangle on the map in add 
mode, then switch to subtract mode and draw the specific ROI  that you 
want to cut out of the big ROI.

Ultimately, I think you will have to make a customized version of 
ROIRenderer.php to do what you want in an efficient manner, though.

Cheers

Paul

Jan Jansen wrote:
> Hi List,
>  
> I was wondering if it is possible to customize the rendering of the ROI 
> Image. I want to obtain a kind of 'inverse' version of the currently 
> drawn ROI image, e.g. the selected ROI rectangle being transparent, and 
> the 'unselected' area's having a colour and opacity defined though the 
> attributes of the ROI widget.. 
> Which files or function(s) should I adjust to achieve this?
> Any comments / help would be highly appreciated.
>  
> Best regards,
>  
> Jan Jansen
> 
> 
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|Paul Spencer                           pspencer at dmsolutions.ca   |
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|Applications & Software Development                              |
|DM Solutions Group Inc                 http://www.dmsolutions.ca/|
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