projection

问题 I know that method exists and is documented, but I don\'t know how to get an MapCanvasProjection object. 回答1: Look at http://qfox.nl/notes/116 var overlay = new google.maps.OverlayView(); overlay.draw = function() {}; overlay.setMap(map); var point = overlay.getProjection().fromLatLngToDivPixel(latLng); Ugly indeed. Much easier in v2 - another flaw of google api v3! 回答2: I think the easiest way is to ignore Google's desire to make our life harder by removing and hiding useful functions

问题 I am currently working on some kind of OCR (Optical Character Recognition) system. I have already written a script to extract each character from the text and clean (most of the) irregularities out of it. I also know the font. The images I have now for example are: M (http://i.imgur.com/oRfSOsJ.png (font) and http://i.imgur.com/UDEJZyV.png (scanned)) K (http://i.imgur.com/PluXtDz.png (font) and http://i.imgur.com/TRuDXSx.png (scanned)) C (http://i.imgur.com/wggsX6M.png (font) and http://i

问题 I\'ve searched around for an example that matches my use case but cannot find one. I\'m trying to convert screen mouse co-ordinates into 3D world co-ordinates taking into account the camera. Solutions I\'ve found all do ray intersection to achieve object picking. What I am trying to do is position the center of a Three.js object at the co-ordinates that the mouse is currently \"over\". My camera is at x:0, y:0, z:500 (although it will move during the simulation) and all my objects are at z =

问题 Suppose you have the following documents in my collection: { \"_id\":ObjectId(\"562e7c594c12942f08fe4192\"), \"shapes\":[ { \"shape\":\"square\", \"color\":\"blue\" }, { \"shape\":\"circle\", \"color\":\"red\" } ] }, { \"_id\":ObjectId(\"562e7c594c12942f08fe4193\"), \"shapes\":[ { \"shape\":\"square\", \"color\":\"black\" }, { \"shape\":\"circle\", \"color\":\"green\" } ] } Do query: db.test.find({\"shapes.color\": \"red\"}, {\"shapes.color\": 1}) Or db.test.find({shapes: {\"$elemMatch\":