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Viewing file:     LinearRing.js (14.68 KB)      -rw-rw-rw-

/* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for 
 * full list of contributors). Published under the Clear BSD license.  
 * See http://svn.openlayers.org/trunk/openlayers/license.txt for the
 * full text of the license. */

/**
 * @requires OpenLayers/Geometry/LineString.js
 */

/**
 * Class: OpenLayers.Geometry.LinearRing
 * 
 * A Linear Ring is a special LineString which is closed. It closes itself 
 * automatically on every addPoint/removePoint by adding a copy of the first
 * point as the last point. 
 * 
 * Also, as it is the first in the line family to close itself, a getArea()
 * function is defined to calculate the enclosed area of the linearRing
 * 
 * Inherits:
 *  - <OpenLayers.Geometry.LineString>
 */
OpenLayers.Geometry.LinearRing = OpenLayers.Class(
  OpenLayers.Geometry.LineString, {

    /**
     * Property: componentTypes
     * {Array(String)} An array of class names representing the types of 
     *                 components that the collection can include.  A null 
     *                 value means the component types are not restricted.
     */
    componentTypes: ["OpenLayers.Geometry.Point"],

    /**
     * Constructor: OpenLayers.Geometry.LinearRing
     * Linear rings are constructed with an array of points.  This array
     *     can represent a closed or open ring.  If the ring is open (the last
     *     point does not equal the first point), the constructor will close
     *     the ring.  If the ring is already closed (the last point does equal
     *     the first point), it will be left closed.
     * 
     * Parameters:
     * points - {Array(<OpenLayers.Geometry.Point>)} points
     */
    initialize: function(points) {
        OpenLayers.Geometry.LineString.prototype.initialize.apply(this, 
                                                                  arguments);
    },

    /**
     * APIMethod: addComponent
     * Adds a point to geometry components.  If the point is to be added to
     *     the end of the components array and it is the same as the last point
     *     already in that array, the duplicate point is not added.  This has 
     *     the effect of closing the ring if it is not already closed, and 
     *     doing the right thing if it is already closed.  This behavior can 
     *     be overridden by calling the method with a non-null index as the 
     *     second argument.
     *
     * Parameter:
     * point - {<OpenLayers.Geometry.Point>}
     * index - {Integer} Index into the array to insert the component
     * 
     * Returns:
     * {Boolean} Was the Point successfully added?
     */
    addComponent: function(point, index) {
        var added = false;

        //remove last point
        var lastPoint = this.components.pop();

        // given an index, add the point
        // without an index only add non-duplicate points
        if(index != null || !point.equals(lastPoint)) {
            added = OpenLayers.Geometry.Collection.prototype.addComponent.apply(this, 
                                                                    arguments);
        }

        //append copy of first point
        var firstPoint = this.components[0];
        OpenLayers.Geometry.Collection.prototype.addComponent.apply(this, 
                                                                [firstPoint]);
        
        return added;
    },
    
    /**
     * APIMethod: removeComponent
     * Removes a point from geometry components.
     *
     * Parameters:
     * point - {<OpenLayers.Geometry.Point>}
     */
    removeComponent: function(point) {
        if (this.components.length > 4) {

            //remove last point
            this.components.pop();
            
            //remove our point
            OpenLayers.Geometry.Collection.prototype.removeComponent.apply(this, 
                                                                    arguments);
            //append copy of first point
            var firstPoint = this.components[0];
            OpenLayers.Geometry.Collection.prototype.addComponent.apply(this, 
                                                                [firstPoint]);
        }
    },
    
    /**
     * APIMethod: move
     * Moves a geometry by the given displacement along positive x and y axes.
     *     This modifies the position of the geometry and clears the cached
     *     bounds.
     *
     * Parameters:
     * x - {Float} Distance to move geometry in positive x direction. 
     * y - {Float} Distance to move geometry in positive y direction.
     */
    move: function(x, y) {
        for(var i = 0, len=this.components.length; i<len - 1; i++) {
            this.components[i].move(x, y);
        }
    },

    /**
     * APIMethod: rotate
     * Rotate a geometry around some origin
     *
     * Parameters:
     * angle - {Float} Rotation angle in degrees (measured counterclockwise
     *                 from the positive x-axis)
     * origin - {<OpenLayers.Geometry.Point>} Center point for the rotation
     */
    rotate: function(angle, origin) {
        for(var i=0, len=this.components.length; i<len - 1; ++i) {
            this.components[i].rotate(angle, origin);
        }
    },

    /**
     * APIMethod: resize
     * Resize a geometry relative to some origin.  Use this method to apply
     *     a uniform scaling to a geometry.
     *
     * Parameters:
     * scale - {Float} Factor by which to scale the geometry.  A scale of 2
     *                 doubles the size of the geometry in each dimension
     *                 (lines, for example, will be twice as long, and polygons
     *                 will have four times the area).
     * origin - {<OpenLayers.Geometry.Point>} Point of origin for resizing
     * ratio - {Float} Optional x:y ratio for resizing.  Default ratio is 1.
     * 
     * Returns:
     * {OpenLayers.Geometry} - The current geometry. 
     */
    resize: function(scale, origin, ratio) {
        for(var i=0, len=this.components.length; i<len - 1; ++i) {
            this.components[i].resize(scale, origin, ratio);
        }
        return this;
    },
    
    /**
     * APIMethod: transform
     * Reproject the components geometry from source to dest.
     *
     * Parameters:
     * source - {<OpenLayers.Projection>}
     * dest - {<OpenLayers.Projection>}
     * 
     * Returns:
     * {<OpenLayers.Geometry>} 
     */
    transform: function(source, dest) {
        if (source && dest) {
            for (var i=0, len=this.components.length; i<len - 1; i++) {
                var component = this.components[i];
                component.transform(source, dest);
            }
            this.bounds = null;
        }
        return this;
    },
    
    /**
     * APIMethod: getCentroid
     *
     * Returns:
     * {<OpenLayers.Geometry.Point>} The centroid of the collection
     */
    getCentroid: function() {
        if (this.components && (this.components.length > 2)) {
            var sumX = 0.0;
            var sumY = 0.0;
            for (var i = 0; i < this.components.length - 1; i++) {
                var b = this.components[i];
                var c = this.components[i+1];
                sumX += (b.x + c.x) * (b.x * c.y - c.x * b.y);
                sumY += (b.y + c.y) * (b.x * c.y - c.x * b.y);
            }
            var area = -1 * this.getArea();
            var x = sumX / (6 * area);
            var y = sumY / (6 * area);
            return new OpenLayers.Geometry.Point(x, y);
        } else {
            return null;
        }
    },

    /**
     * APIMethod: getArea
     * Note - The area is positive if the ring is oriented CW, otherwise
     *         it will be negative.
     * 
     * Returns:
     * {Float} The signed area for a ring.
     */
    getArea: function() {
        var area = 0.0;
        if ( this.components && (this.components.length > 2)) {
            var sum = 0.0;
            for (var i=0, len=this.components.length; i<len - 1; i++) {
                var b = this.components[i];
                var c = this.components[i+1];
                sum += (b.x + c.x) * (c.y - b.y);
            }
            area = - sum / 2.0;
        }
        return area;
    },
    
    /**
     * APIMethod: getGeodesicArea
     * Calculate the approximate area of the polygon were it projected onto
     *     the earth.  Note that this area will be positive if ring is oriented
     *     clockwise, otherwise it will be negative.
     *
     * Parameters:
     * projection - {<OpenLayers.Projection>} The spatial reference system
     *     for the geometry coordinates.  If not provided, Geographic/WGS84 is
     *     assumed.
     * 
     * Reference:
     * Robert. G. Chamberlain and William H. Duquette, "Some Algorithms for
     *     Polygons on a Sphere", JPL Publication 07-03, Jet Propulsion
     *     Laboratory, Pasadena, CA, June 2007 http://trs-new.jpl.nasa.gov/dspace/handle/2014/40409
     *
     * Returns:
     * {float} The approximate signed geodesic area of the polygon in square
     *     meters.
     */
    getGeodesicArea: function(projection) {
        var ring = this;  // so we can work with a clone if needed
        if(projection) {
            var gg = new OpenLayers.Projection("EPSG:4326");
            if(!gg.equals(projection)) {
                ring = this.clone().transform(projection, gg);
            }
        }
        var area = 0.0;
        var len = ring.components && ring.components.length;
        if(len > 2) {
            var p1, p2;
            for(var i=0; i<len-1; i++) {
                p1 = ring.components[i];
                p2 = ring.components[i+1];
                area += OpenLayers.Util.rad(p2.x - p1.x) *
                        (2 + Math.sin(OpenLayers.Util.rad(p1.y)) +
                        Math.sin(OpenLayers.Util.rad(p2.y)));
            }
            area = area * 6378137.0 * 6378137.0 / 2.0;
        }
        return area;
    },
    
    /**
     * Method: containsPoint
     * Test if a point is inside a linear ring.  For the case where a point
     *     is coincident with a linear ring edge, returns 1.  Otherwise,
     *     returns boolean.
     *
     * Parameters:
     * point - {<OpenLayers.Geometry.Point>}
     *
     * Returns:
     * {Boolean | Number} The point is inside the linear ring.  Returns 1 if
     *     the point is coincident with an edge.  Returns boolean otherwise.
     */
    containsPoint: function(point) {
        var approx = OpenLayers.Number.limitSigDigs;
        var digs = 14;
        var px = approx(point.x, digs);
        var py = approx(point.y, digs);
        function getX(y, x1, y1, x2, y2) {
            return (((x1 - x2) * y) + ((x2 * y1) - (x1 * y2))) / (y1 - y2);
        }
        var numSeg = this.components.length - 1;
        var start, end, x1, y1, x2, y2, cx, cy;
        var crosses = 0;
        for(var i=0; i<numSeg; ++i) {
            start = this.components[i];
            x1 = approx(start.x, digs);
            y1 = approx(start.y, digs);
            end = this.components[i + 1];
            x2 = approx(end.x, digs);
            y2 = approx(end.y, digs);
            
            /**
             * The following conditions enforce five edge-crossing rules:
             *    1. points coincident with edges are considered contained;
             *    2. an upward edge includes its starting endpoint, and
             *    excludes its final endpoint;
             *    3. a downward edge excludes its starting endpoint, and
             *    includes its final endpoint;
             *    4. horizontal edges are excluded; and
             *    5. the edge-ray intersection point must be strictly right
             *    of the point P.
             */
            if(y1 == y2) {
                // horizontal edge
                if(py == y1) {
                    // point on horizontal line
                    if(x1 <= x2 && (px >= x1 && px <= x2) || // right or vert
                       x1 >= x2 && (px <= x1 && px >= x2)) { // left or vert
                        // point on edge
                        crosses = -1;
                        break;
                    }
                }
                // ignore other horizontal edges
                continue;
            }
            cx = approx(getX(py, x1, y1, x2, y2), digs);
            if(cx == px) {
                // point on line
                if(y1 < y2 && (py >= y1 && py <= y2) || // upward
                   y1 > y2 && (py <= y1 && py >= y2)) { // downward
                    // point on edge
                    crosses = -1;
                    break;
                }
            }
            if(cx <= px) {
                // no crossing to the right
                continue;
            }
            if(x1 != x2 && (cx < Math.min(x1, x2) || cx > Math.max(x1, x2))) {
                // no crossing
                continue;
            }
            if(y1 < y2 && (py >= y1 && py < y2) || // upward
               y1 > y2 && (py < y1 && py >= y2)) { // downward
                ++crosses;
            }
        }
        var contained = (crosses == -1) ?
            // on edge
            1 :
            // even (out) or odd (in)
            !!(crosses & 1);

        return contained;
    },

    /**
     * APIMethod: intersects
     * Determine if the input geometry intersects this one.
     *
     * Parameters:
     * geometry - {<OpenLayers.Geometry>} Any type of geometry.
     *
     * Returns:
     * {Boolean} The input geometry intersects this one.
     */
    intersects: function(geometry) {
        var intersect = false;
        if(geometry.CLASS_NAME == "OpenLayers.Geometry.Point") {
            intersect = this.containsPoint(geometry);
        } else if(geometry.CLASS_NAME == "OpenLayers.Geometry.LineString") {
            intersect = geometry.intersects(this);
        } else if(geometry.CLASS_NAME == "OpenLayers.Geometry.LinearRing") {
            intersect = OpenLayers.Geometry.LineString.prototype.intersects.apply(
                this, [geometry]
            );
        } else {
            // check for component intersections
            for(var i=0, len=geometry.components.length; i<len; ++ i) {
                intersect = geometry.components[i].intersects(this);
                if(intersect) {
                    break;
                }
            }
        }
        return intersect;
    },

    /**
     * APIMethod: getVertices
     * Return a list of all points in this geometry.
     *
     * Parameters:
     * nodes - {Boolean} For lines, only return vertices that are
     *     endpoints.  If false, for lines, only vertices that are not
     *     endpoints will be returned.  If not provided, all vertices will
     *     be returned.
     *
     * Returns:
     * {Array} A list of all vertices in the geometry.
     */
    getVertices: function(nodes) {
        return (nodes === true) ? [] : this.components.slice(0, this.components.length-1);
    },

    CLASS_NAME: "OpenLayers.Geometry.LinearRing"
});