Need computeScreenSpacePosition for polygon, possibly other primitives

[mrmattf]

I'd like to know where the screen space position for a polygon is to tell me where to put a dom element.

[mramato]

Couldn't you just get the Polygon's extent and then get the screen space position of each corner?

[mrmattf]

possibly. having a function on the polygon,like the billboard and label have, would be a nice convenience. I'm picking objects and would just like to call computeScreenSpacePosition on the object itself and not have to query the type of object to figure out how to compute the screen space.

[mramato]

I'm not saying we shouldn't have a computeScreenSpaceExtent function on Polygon, it's useful and all primitives should have some sort of screen space method. However, I'm not sure computeScreenSpacePosition on every primitive is the way to go. For polygons, the only way a single position make any sense is if we computed a centroid to go a long with it, and on top of that, the centroid may not even be on the screen (at which point I'm not sure if we can actually compute it's position as a negative number or not). Lots of other primitive types would similarly not make sense for a single position in screen space.

That being said, we could ultimately move to computeScreenSpaceBounds which is generic across all primitives and returns a BoundingRectangle. For billboards, the rectangle would include the full bounds of the billboard and a center property would return the same value that computeScreenSpacePosition currently does.

Obviously I'm just brain storming, but I like my second idea since it could apply to all primitives.

[bagnell]

@mrmattf Can we close this?

[mrmattf]

yep. thought this was closed already