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Viewing file:     Point.js (8.7 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.js
 */

/**
 * Class: OpenLayers.Geometry.Point
 * Point geometry class. 
 * 
 * Inherits from:
 *  - <OpenLayers.Geometry> 
 */
OpenLayers.Geometry.Point = OpenLayers.Class(OpenLayers.Geometry, {

    /** 
     * APIProperty: x 
     * {float} 
     */
    x: null,

    /** 
     * APIProperty: y 
     * {float} 
     */
    y: null,

    /**
     * Constructor: OpenLayers.Geometry.Point
     * Construct a point geometry.
     *
     * Parameters:
     * x - {float} 
     * y - {float}
     * 
     */
    initialize: function(x, y) {
        OpenLayers.Geometry.prototype.initialize.apply(this, arguments);
        
        this.x = parseFloat(x);
        this.y = parseFloat(y);
    },

    /**
     * APIMethod: clone
     * 
     * Returns:
     * {<OpenLayers.Geometry.Point>} An exact clone of this OpenLayers.Geometry.Point
     */
    clone: function(obj) {
        if (obj == null) {
            obj = new OpenLayers.Geometry.Point(this.x, this.y);
        }

        // catch any randomly tagged-on properties
        OpenLayers.Util.applyDefaults(obj, this);

        return obj;
    },

    /** 
     * Method: calculateBounds
     * Create a new Bounds based on the lon/lat
     */
    calculateBounds: function () {
        this.bounds = new OpenLayers.Bounds(this.x, this.y,
                                            this.x, this.y);
    },

    /**
     * APIMethod: distanceTo
     * Calculate the closest distance between two geometries (on the x-y plane).
     *
     * Parameters:
     * geometry - {<OpenLayers.Geometry>} The target geometry.
     * options - {Object} Optional properties for configuring the distance
     *     calculation.
     *
     * Valid options:
     * details - {Boolean} Return details from the distance calculation.
     *     Default is false.
     * edge - {Boolean} Calculate the distance from this geometry to the
     *     nearest edge of the target geometry.  Default is true.  If true,
     *     calling distanceTo from a geometry that is wholly contained within
     *     the target will result in a non-zero distance.  If false, whenever
     *     geometries intersect, calling distanceTo will return 0.  If false,
     *     details cannot be returned.
     *
     * Returns:
     * {Number | Object} The distance between this geometry and the target.
     *     If details is true, the return will be an object with distance,
     *     x0, y0, x1, and x2 properties.  The x0 and y0 properties represent
     *     the coordinates of the closest point on this geometry. The x1 and y1
     *     properties represent the coordinates of the closest point on the
     *     target geometry.
     */
    distanceTo: function(geometry, options) {
        var edge = !(options && options.edge === false);
        var details = edge && options && options.details;
        var distance, x0, y0, x1, y1, result;
        if(geometry instanceof OpenLayers.Geometry.Point) {
            x0 = this.x;
            y0 = this.y;
            x1 = geometry.x;
            y1 = geometry.y;
            distance = Math.sqrt(Math.pow(x0 - x1, 2) + Math.pow(y0 - y1, 2));
            result = !details ?
                distance : {x0: x0, y0: y0, x1: x1, y1: y1, distance: distance};
        } else {
            result = geometry.distanceTo(this, options);
            if(details) {
                // switch coord order since this geom is target
                result = {
                    x0: result.x1, y0: result.y1,
                    x1: result.x0, y1: result.y0,
                    distance: result.distance
                };
            }
        }
        return result;
    },
    
    /** 
     * APIMethod: equals
     * Determine whether another geometry is equivalent to this one.  Geometries
     *     are considered equivalent if all components have the same coordinates.
     * 
     * Parameters:
     * geom - {<OpenLayers.Geometry.Point>} The geometry to test. 
     *
     * Returns:
     * {Boolean} The supplied geometry is equivalent to this geometry.
     */
    equals: function(geom) {
        var equals = false;
        if (geom != null) {
            equals = ((this.x == geom.x && this.y == geom.y) ||
                      (isNaN(this.x) && isNaN(this.y) && isNaN(geom.x) && isNaN(geom.y)));
        }
        return equals;
    },
    
    /**
     * Method: toShortString
     *
     * Returns:
     * {String} Shortened String representation of Point object. 
     *         (ex. <i>"5, 42"</i>)
     */
    toShortString: function() {
        return (this.x + ", " + this.y);
    },
    
    /**
     * 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) {
        this.x = this.x + x;
        this.y = this.y + y;
        this.clearBounds();
    },

    /**
     * APIMethod: rotate
     * Rotate a point around another.
     *
     * 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) {
        angle *= Math.PI / 180;
        var radius = this.distanceTo(origin);
        var theta = angle + Math.atan2(this.y - origin.y, this.x - origin.x);
        this.x = origin.x + (radius * Math.cos(theta));
        this.y = origin.y + (radius * Math.sin(theta));
        this.clearBounds();
    },
    
    /**
     * APIMethod: getCentroid
     *
     * Returns:
     * {<OpenLayers.Geometry.Point>} The centroid of the collection
     */
    getCentroid: function() {
        return new OpenLayers.Geometry.Point(this.x, this.y);
    },

    /**
     * APIMethod: resize
     * Resize a point relative to some origin.  For points, this has the effect
     *     of scaling a vector (from the origin to the point).  This method is
     *     more useful on geometry collection subclasses.
     *
     * Parameters:
     * scale - {Float} Ratio of the new distance from the origin to the old
     *                 distance from the origin.  A scale of 2 doubles the
     *                 distance between the point and origin.
     * 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) {
        ratio = (ratio == undefined) ? 1 : ratio;
        this.x = origin.x + (scale * ratio * (this.x - origin.x));
        this.y = origin.y + (scale * (this.y - origin.y));
        this.clearBounds();
        return this;
    },
    
    /**
     * 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.equals(geometry);
        } else {
            intersect = geometry.intersects(this);
        }
        return intersect;
    },
    
    /**
     * APIMethod: transform
     * Translate the x,y properties of the point from source to dest.
     * 
     * Parameters:
     * source - {<OpenLayers.Projection>} 
     * dest - {<OpenLayers.Projection>}
     * 
     * Returns:
     * {<OpenLayers.Geometry>} 
     */
    transform: function(source, dest) {
        if ((source && dest)) {
            OpenLayers.Projection.transform(
                this, source, dest); 
            this.bounds = null;
        }       
        return this;
    },

    /**
     * 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 [this];
    },

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