Transparent Filled Polygon
I'm working on a map program where each building is clickable and when it's clicked the page is refreshed to show a map with the building highlighted (in red). I was wondering if it would be possible to highlight the buildings using some sort of combination of the imagepolygonfill function and a transparency function (i'd like the buildings to still be visible under the highlight), rather than having to create many different files with the different buildings highlighted.
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