Upgrading openlayers to 3.x

1 files changed, 0 insertions, 906 deletions

diff --git a/misc/openlayers/lib/OpenLayers/Renderer/Canvas.js b/misc/openlayers/lib/OpenLayers/Renderer/Canvas.js
deleted file mode 100644
index 61a327c..0000000
--- a/misc/openlayers/lib/OpenLayers/Renderer/Canvas.js
+++ /dev/null
@@ -1,906 +0,0 @@
-/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
- * full list of contributors). Published under the 2-clause BSD license.
- * See license.txt in the OpenLayers distribution or repository for the
- * full text of the license. */
-
-/**
- * @requires OpenLayers/Renderer.js
- */
-
-/**
- * Class: OpenLayers.Renderer.Canvas 
- * A renderer based on the 2D 'canvas' drawing element.
- * 
- * Inherits:
- *  - <OpenLayers.Renderer>
- */
-OpenLayers.Renderer.Canvas = OpenLayers.Class(OpenLayers.Renderer, {
-    
-    /**
-     * APIProperty: hitDetection
-     * {Boolean} Allow for hit detection of features.  Default is true.
-     */
-    hitDetection: true,
-    
-    /**
-     * Property: hitOverflow
-     * {Number} The method for converting feature identifiers to color values
-     *     supports 16777215 sequential values.  Two features cannot be 
-     *     predictably detected if their identifiers differ by more than this
-     *     value.  The hitOverflow allows for bigger numbers (but the 
-     *     difference in values is still limited).
-     */
-    hitOverflow: 0,
-
-    /**
-     * Property: canvas
-     * {Canvas} The canvas context object.
-     */
-    canvas: null, 
-    
-    /**
-     * Property: features
-     * {Object} Internal object of feature/style pairs for use in redrawing the layer.
-     */
-    features: null,
-    
-    /**
-     * Property: pendingRedraw
-     * {Boolean} The renderer needs a redraw call to render features added while
-     *     the renderer was locked.
-     */
-    pendingRedraw: false,
-    
-    /**
-     * Property: cachedSymbolBounds
-     * {Object} Internal cache of calculated symbol extents.
-     */
-    cachedSymbolBounds: {},
-    
-    /**
-     * Constructor: OpenLayers.Renderer.Canvas
-     *
-     * Parameters:
-     * containerID - {<String>}
-     * options - {Object} Optional properties to be set on the renderer.
-     */
-    initialize: function(containerID, options) {
-        OpenLayers.Renderer.prototype.initialize.apply(this, arguments);
-        this.root = document.createElement("canvas");
-        this.container.appendChild(this.root);
-        this.canvas = this.root.getContext("2d");
-        this.features = {};
-        if (this.hitDetection) {
-            this.hitCanvas = document.createElement("canvas");
-            this.hitContext = this.hitCanvas.getContext("2d");
-        }
-    },
-    
-    /**
-     * Method: setExtent
-     * Set the visible part of the layer.
-     *
-     * Parameters:
-     * extent - {<OpenLayers.Bounds>}
-     * resolutionChanged - {Boolean}
-     *
-     * Returns:
-     * {Boolean} true to notify the layer that the new extent does not exceed
-     *     the coordinate range, and the features will not need to be redrawn.
-     *     False otherwise.
-     */
-    setExtent: function() {
-        OpenLayers.Renderer.prototype.setExtent.apply(this, arguments);
-        // always redraw features
-        return false;
-    },
-    
-    /** 
-     * Method: eraseGeometry
-     * Erase a geometry from the renderer. Because the Canvas renderer has
-     *     'memory' of the features that it has drawn, we have to remove the
-     *     feature so it doesn't redraw.   
-     * 
-     * Parameters:
-     * geometry - {<OpenLayers.Geometry>}
-     * featureId - {String}
-     */
-    eraseGeometry: function(geometry, featureId) {
-        this.eraseFeatures(this.features[featureId][0]);
-    },
-
-    /**
-     * APIMethod: supported
-     * 
-     * Returns:
-     * {Boolean} Whether or not the browser supports the renderer class
-     */
-    supported: function() {
-        return OpenLayers.CANVAS_SUPPORTED;
-    },    
-    
-    /**
-     * Method: setSize
-     * Sets the size of the drawing surface.
-     *
-     * Once the size is updated, redraw the canvas.
-     *
-     * Parameters:
-     * size - {<OpenLayers.Size>} 
-     */
-    setSize: function(size) {
-        this.size = size.clone();
-        var root = this.root;
-        root.style.width = size.w + "px";
-        root.style.height = size.h + "px";
-        root.width = size.w;
-        root.height = size.h;
-        this.resolution = null;
-        if (this.hitDetection) {
-            var hitCanvas = this.hitCanvas;
-            hitCanvas.style.width = size.w + "px";
-            hitCanvas.style.height = size.h + "px";
-            hitCanvas.width = size.w;
-            hitCanvas.height = size.h;
-        }
-    },
-    
-    /**
-     * Method: drawFeature
-     * Draw the feature. Stores the feature in the features list,
-     * then redraws the layer. 
-     *
-     * Parameters:
-     * feature - {<OpenLayers.Feature.Vector>} 
-     * style - {<Object>} 
-     *
-     * Returns:
-     * {Boolean} The feature has been drawn completely.  If the feature has no
-     *     geometry, undefined will be returned.  If the feature is not rendered
-     *     for other reasons, false will be returned.
-     */
-    drawFeature: function(feature, style) {
-        var rendered;
-        if (feature.geometry) {
-            style = this.applyDefaultSymbolizer(style || feature.style);
-            // don't render if display none or feature outside extent
-            var bounds = feature.geometry.getBounds();
-
-            var worldBounds;
-            if (this.map.baseLayer && this.map.baseLayer.wrapDateLine) {
-                worldBounds = this.map.getMaxExtent();
-            }
-
-            var intersects = bounds && bounds.intersectsBounds(this.extent, {worldBounds: worldBounds});
-
-            rendered = (style.display !== "none") && !!bounds && intersects;
-            if (rendered) {
-                // keep track of what we have rendered for redraw
-                this.features[feature.id] = [feature, style];
-            }
-            else {
-                // remove from features tracked for redraw
-                delete(this.features[feature.id]);
-            }
-            this.pendingRedraw = true;
-        }
-        if (this.pendingRedraw && !this.locked) {
-            this.redraw();
-            this.pendingRedraw = false;
-        }
-        return rendered;
-    },
-
-    /** 
-     * Method: drawGeometry
-     * Used when looping (in redraw) over the features; draws
-     * the canvas. 
-     *
-     * Parameters:
-     * geometry - {<OpenLayers.Geometry>} 
-     * style - {Object} 
-     */
-    drawGeometry: function(geometry, style, featureId) {
-        var className = geometry.CLASS_NAME;
-        if ((className == "OpenLayers.Geometry.Collection") ||
-            (className == "OpenLayers.Geometry.MultiPoint") ||
-            (className == "OpenLayers.Geometry.MultiLineString") ||
-            (className == "OpenLayers.Geometry.MultiPolygon")) {
-            for (var i = 0; i < geometry.components.length; i++) {
-                this.drawGeometry(geometry.components[i], style, featureId);
-            }
-            return;
-        }
-        switch (geometry.CLASS_NAME) {
-            case "OpenLayers.Geometry.Point":
-                this.drawPoint(geometry, style, featureId);
-                break;
-            case "OpenLayers.Geometry.LineString":
-                this.drawLineString(geometry, style, featureId);
-                break;
-            case "OpenLayers.Geometry.LinearRing":
-                this.drawLinearRing(geometry, style, featureId);
-                break;
-            case "OpenLayers.Geometry.Polygon":
-                this.drawPolygon(geometry, style, featureId);
-                break;
-            default:
-                break;
-        }
-    },
-
-    /**
-     * Method: drawExternalGraphic
-     * Called to draw External graphics. 
-     * 
-     * Parameters: 
-     * geometry - {<OpenLayers.Geometry>}
-     * style    - {Object}
-     * featureId - {String}
-     */ 
-    drawExternalGraphic: function(geometry, style, featureId) {
-        var img = new Image();
-
-        var title = style.title || style.graphicTitle;        
-        if (title) {
-            img.title = title;           
-        }
-
-        var width = style.graphicWidth || style.graphicHeight;
-        var height = style.graphicHeight || style.graphicWidth;
-        width = width ? width : style.pointRadius * 2;
-        height = height ? height : style.pointRadius * 2;
-        var xOffset = (style.graphicXOffset != undefined) ?
-           style.graphicXOffset : -(0.5 * width);
-        var yOffset = (style.graphicYOffset != undefined) ?
-           style.graphicYOffset : -(0.5 * height);
-
-        var opacity = style.graphicOpacity || style.fillOpacity;
-        
-        var onLoad = function() {
-            if(!this.features[featureId]) {
-                return;
-            }
-            var pt = this.getLocalXY(geometry);
-            var p0 = pt[0];
-            var p1 = pt[1];
-            if(!isNaN(p0) && !isNaN(p1)) {
-                var x = (p0 + xOffset) | 0;
-                var y = (p1 + yOffset) | 0;
-                var canvas = this.canvas;
-                canvas.globalAlpha = opacity;
-                var factor = OpenLayers.Renderer.Canvas.drawImageScaleFactor ||
-                    (OpenLayers.Renderer.Canvas.drawImageScaleFactor =
-                        /android 2.1/.test(navigator.userAgent.toLowerCase()) ?
-                            // 320 is the screen width of the G1 phone, for
-                            // which drawImage works out of the box.
-                            320 / window.screen.width : 1
-                    );
-                canvas.drawImage(
-                    img, x*factor, y*factor, width*factor, height*factor
-                );
-                if (this.hitDetection) {
-                    this.setHitContextStyle("fill", featureId);
-                    this.hitContext.fillRect(x, y, width, height);
-                }
-            }
-        };
-
-        img.onload = OpenLayers.Function.bind(onLoad, this);
-        img.src = style.externalGraphic;
-    },
-
-    /**
-     * Method: drawNamedSymbol
-     * Called to draw Well Known Graphic Symbol Name. 
-     * This method is only called by the renderer itself.
-     * 
-     * Parameters: 
-     * geometry - {<OpenLayers.Geometry>}
-     * style    - {Object}
-     * featureId - {String}
-     */ 
-    drawNamedSymbol: function(geometry, style, featureId) {
-        var x, y, cx, cy, i, symbolBounds, scaling, angle;
-        var unscaledStrokeWidth;
-        var deg2rad = Math.PI / 180.0;
-        
-        var symbol = OpenLayers.Renderer.symbol[style.graphicName];
-         
-        if (!symbol) {
-            throw new Error(style.graphicName + ' is not a valid symbol name');
-        }
-        
-        if (!symbol.length || symbol.length < 2) return;
-        
-        var pt = this.getLocalXY(geometry);
-        var p0 = pt[0];
-        var p1 = pt[1];
-       
-        if (isNaN(p0) || isNaN(p1)) return;
-        
-        // Use rounded line caps
-        this.canvas.lineCap = "round";
-        this.canvas.lineJoin = "round";
-        
-        if (this.hitDetection) {
-            this.hitContext.lineCap = "round";
-            this.hitContext.lineJoin = "round";
-        }
-        
-        // Scale and rotate symbols, using precalculated bounds whenever possible.
-        if (style.graphicName in this.cachedSymbolBounds) {
-            symbolBounds = this.cachedSymbolBounds[style.graphicName];
-        } else {
-            symbolBounds = new OpenLayers.Bounds();
-            for(i = 0; i < symbol.length; i+=2) {
-                symbolBounds.extend(new OpenLayers.LonLat(symbol[i], symbol[i+1]));
-            }
-            this.cachedSymbolBounds[style.graphicName] = symbolBounds;
-        }
-        
-        // Push symbol scaling, translation and rotation onto the transformation stack in reverse order.
-        // Don't forget to apply all canvas transformations to the hitContext canvas as well(!)
-        this.canvas.save();
-        if (this.hitDetection) { this.hitContext.save(); }
-        
-        // Step 3: place symbol at the desired location
-        this.canvas.translate(p0,p1);
-        if (this.hitDetection) { this.hitContext.translate(p0,p1); }
-        
-        // Step 2a. rotate the symbol if necessary
-        angle = deg2rad * style.rotation; // will be NaN when style.rotation is undefined.
-        if (!isNaN(angle)) {
-            this.canvas.rotate(angle);
-            if (this.hitDetection) { this.hitContext.rotate(angle); }
-        }
-                
-        // // Step 2: scale symbol such that pointRadius equals half the maximum symbol dimension.
-        scaling = 2.0 * style.pointRadius / Math.max(symbolBounds.getWidth(), symbolBounds.getHeight());
-        this.canvas.scale(scaling,scaling);
-        if (this.hitDetection) { this.hitContext.scale(scaling,scaling); }
-        
-        // Step 1: center the symbol at the origin        
-        cx = symbolBounds.getCenterLonLat().lon;
-        cy = symbolBounds.getCenterLonLat().lat;
-        this.canvas.translate(-cx,-cy);
-        if (this.hitDetection) { this.hitContext.translate(-cx,-cy); }        
-
-        // Don't forget to scale stroke widths, because they are affected by canvas scale transformations as well(!)
-        // Alternative: scale symbol coordinates manually, so stroke width scaling is not needed anymore.
-        unscaledStrokeWidth = style.strokeWidth;
-        style.strokeWidth = unscaledStrokeWidth / scaling;
-            
-        if (style.fill !== false) {
-            this.setCanvasStyle("fill", style);
-            this.canvas.beginPath();
-            for (i=0; i<symbol.length; i=i+2) {
-                x = symbol[i];
-                y = symbol[i+1];
-                if (i == 0) this.canvas.moveTo(x,y);
-                this.canvas.lineTo(x,y);
-            }
-            this.canvas.closePath();
-            this.canvas.fill();
-
-            if (this.hitDetection) {
-                this.setHitContextStyle("fill", featureId, style);
-                this.hitContext.beginPath();
-                for (i=0; i<symbol.length; i=i+2) {
-                    x = symbol[i];
-                    y = symbol[i+1];
-                    if (i == 0) this.canvas.moveTo(x,y);
-                    this.hitContext.lineTo(x,y);
-                }
-                this.hitContext.closePath();
-                this.hitContext.fill();
-            }
-        }  
-        
-        if (style.stroke !== false) {
-            this.setCanvasStyle("stroke", style);
-            this.canvas.beginPath();
-            for (i=0; i<symbol.length; i=i+2) {
-                x = symbol[i];
-                y = symbol[i+1];
-                if (i == 0) this.canvas.moveTo(x,y);
-                this.canvas.lineTo(x,y);
-            }
-            this.canvas.closePath();
-            this.canvas.stroke();
-            
-            
-            if (this.hitDetection) {
-                this.setHitContextStyle("stroke", featureId, style, scaling);
-                this.hitContext.beginPath();
-                for (i=0; i<symbol.length; i=i+2) {
-                    x = symbol[i];
-                    y = symbol[i+1];
-                    if (i == 0) this.hitContext.moveTo(x,y);
-                    this.hitContext.lineTo(x,y);
-                }
-                this.hitContext.closePath();
-                this.hitContext.stroke();
-            }
-            
-        }
-        
-        style.strokeWidth = unscaledStrokeWidth;
-        this.canvas.restore();
-        if (this.hitDetection) { this.hitContext.restore(); }
-        this.setCanvasStyle("reset");  
-    },
-
-    /**
-     * Method: setCanvasStyle
-     * Prepare the canvas for drawing by setting various global settings.
-     *
-     * Parameters:
-     * type - {String} one of 'stroke', 'fill', or 'reset'
-     * style - {Object} Symbolizer hash
-     */
-    setCanvasStyle: function(type, style) {
-        if (type === "fill") {     
-            this.canvas.globalAlpha = style['fillOpacity'];
-            this.canvas.fillStyle = style['fillColor'];
-        } else if (type === "stroke") {  
-            this.canvas.globalAlpha = style['strokeOpacity'];
-            this.canvas.strokeStyle = style['strokeColor'];
-            this.canvas.lineWidth = style['strokeWidth'];
-        } else {
-            this.canvas.globalAlpha = 0;
-            this.canvas.lineWidth = 1;
-        }
-    },
-    
-    /**
-     * Method: featureIdToHex
-     * Convert a feature ID string into an RGB hex string.
-     *
-     * Parameters:
-     * featureId - {String} Feature id
-     *
-     * Returns:
-     * {String} RGB hex string.
-     */
-    featureIdToHex: function(featureId) {
-        var id = Number(featureId.split("_").pop()) + 1; // zero for no feature
-        if (id >= 16777216) {
-            this.hitOverflow = id - 16777215;
-            id = id % 16777216 + 1;
-        }
-        var hex = "000000" + id.toString(16);
-        var len = hex.length;
-        hex = "#" + hex.substring(len-6, len);
-        return hex;
-    },
-    
-    /**
-     * Method: setHitContextStyle
-     * Prepare the hit canvas for drawing by setting various global settings.
-     *
-     * Parameters:
-     * type - {String} one of 'stroke', 'fill', or 'reset'
-     * featureId - {String} The feature id.
-     * symbolizer - {<OpenLayers.Symbolizer>} The symbolizer.
-     */
-    setHitContextStyle: function(type, featureId, symbolizer, strokeScaling) {
-        var hex = this.featureIdToHex(featureId);
-        if (type == "fill") {
-            this.hitContext.globalAlpha = 1.0;
-            this.hitContext.fillStyle = hex;
-        } else if (type == "stroke") {  
-            this.hitContext.globalAlpha = 1.0;
-            this.hitContext.strokeStyle = hex;
-            // bump up stroke width to deal with antialiasing. If strokeScaling is defined, we're rendering a symbol 
-            // on a transformed canvas, so the antialias width bump has to scale as well.
-            if (typeof strokeScaling === "undefined") {
-                this.hitContext.lineWidth = symbolizer.strokeWidth + 2;
-            } else {
-                if (!isNaN(strokeScaling)) { this.hitContext.lineWidth = symbolizer.strokeWidth + 2.0 / strokeScaling; }
-            }
-        } else {
-            this.hitContext.globalAlpha = 0;
-            this.hitContext.lineWidth = 1;
-        }
-    },
-
-    /**
-     * Method: drawPoint
-     * This method is only called by the renderer itself.
-     * 
-     * Parameters: 
-     * geometry - {<OpenLayers.Geometry>}
-     * style    - {Object}
-     * featureId - {String}
-     */ 
-    drawPoint: function(geometry, style, featureId) {
-        if(style.graphic !== false) {
-            if(style.externalGraphic) {
-                this.drawExternalGraphic(geometry, style, featureId);
-            } else if (style.graphicName && (style.graphicName != "circle")) {
-                this.drawNamedSymbol(geometry, style, featureId);
-            } else {
-                var pt = this.getLocalXY(geometry);
-                var p0 = pt[0];
-                var p1 = pt[1];
-                if(!isNaN(p0) && !isNaN(p1)) {
-                    var twoPi = Math.PI*2;
-                    var radius = style.pointRadius;
-                    if(style.fill !== false) {
-                        this.setCanvasStyle("fill", style);
-                        this.canvas.beginPath();
-                        this.canvas.arc(p0, p1, radius, 0, twoPi, true);
-                        this.canvas.fill();
-                        if (this.hitDetection) {
-                            this.setHitContextStyle("fill", featureId, style);
-                            this.hitContext.beginPath();
-                            this.hitContext.arc(p0, p1, radius, 0, twoPi, true);
-                            this.hitContext.fill();
-                        }
-                    }
-
-                    if(style.stroke !== false) {
-                        this.setCanvasStyle("stroke", style);
-                        this.canvas.beginPath();
-                        this.canvas.arc(p0, p1, radius, 0, twoPi, true);
-                        this.canvas.stroke();
-                        if (this.hitDetection) {
-                            this.setHitContextStyle("stroke", featureId, style);
-                            this.hitContext.beginPath();
-                            this.hitContext.arc(p0, p1, radius, 0, twoPi, true);
-                            this.hitContext.stroke();
-                        }
-                        this.setCanvasStyle("reset");
-                    }
-                }
-            }
-        }
-    },
-    
-    /**
-     * Method: drawLineString
-     * This method is only called by the renderer itself.
-     * 
-     * Parameters: 
-     * geometry - {<OpenLayers.Geometry>}
-     * style    - {Object}
-     * featureId - {String}
-     */ 
-    drawLineString: function(geometry, style, featureId) {
-        style = OpenLayers.Util.applyDefaults({fill: false}, style);
-        this.drawLinearRing(geometry, style, featureId);
-    },    
-    
-    /**
-     * Method: drawLinearRing
-     * This method is only called by the renderer itself.
-     * 
-     * Parameters: 
-     * geometry - {<OpenLayers.Geometry>}
-     * style    - {Object}
-     * featureId - {String}
-     */ 
-    drawLinearRing: function(geometry, style, featureId) {
-        if (style.fill !== false) {
-            this.setCanvasStyle("fill", style);
-            this.renderPath(this.canvas, geometry, style, featureId, "fill");
-            if (this.hitDetection) {
-                this.setHitContextStyle("fill", featureId, style);
-                this.renderPath(this.hitContext, geometry, style, featureId, "fill");
-            }
-        }
-        if (style.stroke !== false) {
-            this.setCanvasStyle("stroke", style);
-            this.renderPath(this.canvas, geometry, style, featureId, "stroke");
-            if (this.hitDetection) {
-                this.setHitContextStyle("stroke", featureId, style);
-                this.renderPath(this.hitContext, geometry, style, featureId, "stroke");
-            }
-        }
-        this.setCanvasStyle("reset");
-    },
-    
-    /**
-     * Method: renderPath
-     * Render a path with stroke and optional fill.
-     */
-    renderPath: function(context, geometry, style, featureId, type) {
-        var components = geometry.components;
-        var len = components.length;
-        context.beginPath();
-        var start = this.getLocalXY(components[0]);
-        var x = start[0];
-        var y = start[1];
-        if (!isNaN(x) && !isNaN(y)) {
-            context.moveTo(start[0], start[1]);
-            for (var i=1; i<len; ++i) {
-                var pt = this.getLocalXY(components[i]);
-                context.lineTo(pt[0], pt[1]);
-            }
-            if (type === "fill") {
-                context.fill();
-            } else {
-                context.stroke();
-            }
-        }
-    },
-    
-    /**
-     * Method: drawPolygon
-     * This method is only called by the renderer itself.
-     * 
-     * Parameters: 
-     * geometry - {<OpenLayers.Geometry>}
-     * style    - {Object}
-     * featureId - {String}
-     */ 
-    drawPolygon: function(geometry, style, featureId) {
-        var components = geometry.components;
-        var len = components.length;
-        this.drawLinearRing(components[0], style, featureId);
-        // erase inner rings
-        for (var i=1; i<len; ++i) {
-            /** 
-             * Note that this is overly agressive.  Here we punch holes through 
-             * all previously rendered features on the same canvas.  A better 
-             * solution for polygons with interior rings would be to draw the 
-             * polygon on a sketch canvas first.  We could erase all holes 
-             * there and then copy the drawing to the layer canvas. 
-             * TODO: http://trac.osgeo.org/openlayers/ticket/3130 
-             */
-            this.canvas.globalCompositeOperation = "destination-out";
-            if (this.hitDetection) {
-                this.hitContext.globalCompositeOperation = "destination-out";
-            }
-            this.drawLinearRing(
-                components[i], 
-                OpenLayers.Util.applyDefaults({stroke: false, fillOpacity: 1.0}, style),
-                featureId
-            );
-            this.canvas.globalCompositeOperation = "source-over";
-            if (this.hitDetection) {
-                this.hitContext.globalCompositeOperation = "source-over";
-            }
-            this.drawLinearRing(
-                components[i], 
-                OpenLayers.Util.applyDefaults({fill: false}, style),
-                featureId
-            );
-        }
-    },
-    
-    /**
-     * Method: drawText
-     * This method is only called by the renderer itself.
-     *
-     * Parameters:
-     * location - {<OpenLayers.Point>}
-     * style    - {Object}
-     */
-    drawText: function(location, style) {
-        var pt = this.getLocalXY(location);
-
-        this.setCanvasStyle("reset");
-        this.canvas.fillStyle = style.fontColor;
-        this.canvas.globalAlpha = style.fontOpacity || 1.0;
-        var fontStyle = [style.fontStyle ? style.fontStyle : "normal",
-                         "normal", // "font-variant" not supported
-                         style.fontWeight ? style.fontWeight : "normal",
-                         style.fontSize ? style.fontSize : "1em",
-                         style.fontFamily ? style.fontFamily : "sans-serif"].join(" ");
-        var labelRows = style.label.split('\n');
-        var numRows = labelRows.length;
-        if (this.canvas.fillText) {
-            // HTML5
-            this.canvas.font = fontStyle;
-            this.canvas.textAlign =
-                OpenLayers.Renderer.Canvas.LABEL_ALIGN[style.labelAlign[0]] ||
-                "center";
-            this.canvas.textBaseline =
-                OpenLayers.Renderer.Canvas.LABEL_ALIGN[style.labelAlign[1]] ||
-                "middle";
-            var vfactor =
-                OpenLayers.Renderer.Canvas.LABEL_FACTOR[style.labelAlign[1]];
-            if (vfactor == null) {
-                vfactor = -.5;
-            }
-            var lineHeight =
-                this.canvas.measureText('Mg').height ||
-                this.canvas.measureText('xx').width;
-            pt[1] += lineHeight*vfactor*(numRows-1);
-            for (var i = 0; i < numRows; i++) {
-                if (style.labelOutlineWidth) {
-                    this.canvas.save();
-                    this.canvas.globalAlpha = style.labelOutlineOpacity || style.fontOpacity || 1.0;
-                    this.canvas.strokeStyle = style.labelOutlineColor;
-                    this.canvas.lineWidth = style.labelOutlineWidth;
-                    this.canvas.strokeText(labelRows[i], pt[0], pt[1] + (lineHeight*i) + 1);
-                    this.canvas.restore();
-                }
-                this.canvas.fillText(labelRows[i], pt[0], pt[1] + (lineHeight*i));
-            }
-        } else if (this.canvas.mozDrawText) {
-            // Mozilla pre-Gecko1.9.1 (<FF3.1)
-            this.canvas.mozTextStyle = fontStyle;
-            // No built-in text alignment, so we measure and adjust the position
-            var hfactor =
-                OpenLayers.Renderer.Canvas.LABEL_FACTOR[style.labelAlign[0]];
-            if (hfactor == null) {
-                hfactor = -.5;
-            }
-            var vfactor =
-                OpenLayers.Renderer.Canvas.LABEL_FACTOR[style.labelAlign[1]];
-            if (vfactor == null) {
-                vfactor = -.5;
-            }
-            var lineHeight = this.canvas.mozMeasureText('xx');
-            pt[1] += lineHeight*(1 + (vfactor*numRows));
-            for (var i = 0; i < numRows; i++) {
-                var x = pt[0] + (hfactor*this.canvas.mozMeasureText(labelRows[i]));
-                var y = pt[1] + (i*lineHeight);
-                this.canvas.translate(x, y);
-                this.canvas.mozDrawText(labelRows[i]);
-                this.canvas.translate(-x, -y);
-            }
-        }
-        this.setCanvasStyle("reset");
-    },
-    
-    /**
-     * Method: getLocalXY
-     * transform geographic xy into pixel xy
-     *
-     * Parameters: 
-     * point - {<OpenLayers.Geometry.Point>}
-     */
-    getLocalXY: function(point) {
-        var resolution = this.getResolution();
-        var extent = this.extent;
-        var x = ((point.x - this.featureDx) / resolution + (-extent.left / resolution));
-        var y = ((extent.top / resolution) - point.y / resolution);
-        return [x, y];
-    },
-
-    /**
-     * Method: clear
-     * Clear all vectors from the renderer.
-     */    
-    clear: function() {
-        var height = this.root.height;
-        var width = this.root.width;
-        this.canvas.clearRect(0, 0, width, height);
-        this.features = {};
-        if (this.hitDetection) {
-            this.hitContext.clearRect(0, 0, width, height);
-        }
-    },
-
-    /**
-     * Method: getFeatureIdFromEvent
-     * Returns a feature id from an event on the renderer.  
-     * 
-     * Parameters:
-     * evt - {<OpenLayers.Event>} 
-     *
-     * Returns:
-     * {<OpenLayers.Feature.Vector} A feature or undefined.  This method returns a 
-     *     feature instead of a feature id to avoid an unnecessary lookup on the
-     *     layer.
-     */
-    getFeatureIdFromEvent: function(evt) {
-        var featureId, feature;
-        
-        if (this.hitDetection && this.root.style.display !== "none") {
-            // this dragging check should go in the feature handler
-            if (!this.map.dragging) {
-                var xy = evt.xy;
-                var x = xy.x | 0;
-                var y = xy.y | 0;
-                var data = this.hitContext.getImageData(x, y, 1, 1).data;
-                if (data[3] === 255) { // antialiased
-                    var id = data[2] + (256 * (data[1] + (256 * data[0])));
-                    if (id) {
-                        featureId = "OpenLayers_Feature_Vector_" + (id - 1 + this.hitOverflow);
-                        try {
-                            feature = this.features[featureId][0];
-                        } catch(err) {
-                            // Because of antialiasing on the canvas, when the hit location is at a point where the edge of
-                            // one symbol intersects the interior of another symbol, a wrong hit color (and therefore id) results.
-                            // todo: set Antialiasing = 'off' on the hitContext as soon as browsers allow it.
-                        }
-                    }
-                }
-            }
-        }
-        return feature;
-    },
-    
-    /**
-     * Method: eraseFeatures 
-     * This is called by the layer to erase features; removes the feature from
-     *     the list, then redraws the layer.
-     * 
-     * Parameters:
-     * features - {Array(<OpenLayers.Feature.Vector>)} 
-     */
-    eraseFeatures: function(features) {
-        if(!(OpenLayers.Util.isArray(features))) {
-            features = [features];
-        }
-        for(var i=0; i<features.length; ++i) {
-            delete this.features[features[i].id];
-        }
-        this.redraw();
-    },
-
-    /**
-     * Method: redraw
-     * The real 'meat' of the function: any time things have changed,
-     *     redraw() can be called to loop over all the data and (you guessed
-     *     it) redraw it.  Unlike Elements-based Renderers, we can't interact
-     *     with things once they're drawn, to remove them, for example, so
-     *     instead we have to just clear everything and draw from scratch.
-     */
-    redraw: function() {
-        if (!this.locked) {
-            var height = this.root.height;
-            var width = this.root.width;
-            this.canvas.clearRect(0, 0, width, height);
-            if (this.hitDetection) {
-                this.hitContext.clearRect(0, 0, width, height);
-            }
-            var labelMap = [];
-            var feature, geometry, style;
-            var worldBounds = (this.map.baseLayer && this.map.baseLayer.wrapDateLine) && this.map.getMaxExtent();
-            for (var id in this.features) {
-                if (!this.features.hasOwnProperty(id)) { continue; }
-                feature = this.features[id][0];
-                geometry = feature.geometry;
-                this.calculateFeatureDx(geometry.getBounds(), worldBounds);
-                style = this.features[id][1];
-                this.drawGeometry(geometry, style, feature.id);
-                if(style.label) {
-                    labelMap.push([feature, style]);
-                }
-            }
-            var item;
-            for (var i=0, len=labelMap.length; i<len; ++i) {
-                item = labelMap[i];
-                this.drawText(item[0].geometry.getCentroid(), item[1]);
-            }
-        }    
-    },
-
-    CLASS_NAME: "OpenLayers.Renderer.Canvas"
-});
-
-/**
- * Constant: OpenLayers.Renderer.Canvas.LABEL_ALIGN
- * {Object}
- */
-OpenLayers.Renderer.Canvas.LABEL_ALIGN = {
-    "l": "left",
-    "r": "right",
-    "t": "top",
-    "b": "bottom"
-};
-
-/**
- * Constant: OpenLayers.Renderer.Canvas.LABEL_FACTOR
- * {Object}
- */
-OpenLayers.Renderer.Canvas.LABEL_FACTOR = {
-    "l": 0,
-    "r": -1,
-    "t": 0,
-    "b": -1
-};
-
-/**
- * Constant: OpenLayers.Renderer.Canvas.drawImageScaleFactor
- * {Number} Scale factor to apply to the canvas drawImage arguments. This
- *     is always 1 except for Android 2.1 devices, to work around
- *     http://code.google.com/p/android/issues/detail?id=5141.
- */
-OpenLayers.Renderer.Canvas.drawImageScaleFactor = null;