On Thu, Dec 17, 2009 at 11:41 PM, Christopher Schmidt <crschm...@metacarta.com> wrote: > 1. In Javascript/Images/DOM (ignoring Canvas for the moment), there is > no way to make an image exist on an angle.
That depends on what browsers you want to support ;) Most major browsers now have support for CSS3 transformations that allow us to rotate to any angle on the client side. Safari, Firefox, Chrome, and a fall-back option for IE. Hopefully we could find a way to detect the transform-capability by checking currentStyle or similar, and only show the control for supported browsers. I guess we still have to re-write some parts of OpenLayers. Like how to calculate the map extent, modify getLonLatFromViewPortPx, rewrite the layers to resize/load tiles when rotated, etc... but we'll get the caching-benefits of tiling. And we don't have to do anything server side. Except for labels :/ Which I guess might be a show stopper for some. Theoretically I guess it would be possible to have several rotated label-layers, and let the controller decide which is closest to the current rotation. I.e. label-layer rotated (on map-server) to North, East, South and West. Then the labels would never be more than 45 degrees off. Another option could be to add labels client-side. But I don't know much about map-servers, so I'll leave that for others to discuss. WebKit (-webkit-transform) has supported rotations for a while: http://developer.apple.com/safari/library/documentation/InternetWeb/Conceptual/SafariVisualEffectsProgGuide/Transforms/Transforms.html Firefox got -moz-transform in 3.5: http://developer.mozilla.org/En/CSS/Using_CSS_transforms Fall-back for IE (filters *ugh*), but it should work. MIT/GPL, so could easily be ported to fit OpenLayers: http://paulbakaus.com/2008/08/16/bringing-css-transform-to-internet-explorer/ Couldn't find any info about Opera, but they're working on CSS3, and transformations is in the CSS3 draft (http://www.w3.org/TR/css3-2d-transforms/). So I guess it's only a matter of time. Just a wild thought... Merry Christmas to everyone! Gregers _______________________________________________ Dev mailing list Dev@openlayers.org http://openlayers.org/mailman/listinfo/dev
