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lib/ICC/Javascripts/rgraph/RGraph.common.core.js  view on Meta::CPAN

    * @param  number cy  The centery coordinate
    * @param  number x   The X coordinate (eg the mouseX if coming from a click)
    * @param  number y   The Y coordinate (eg the mouseY if coming from a click)
    * @return number     The relevant angle (measured in in RADIANS)
    */
    RG.getAngleByXY = function (cx, cy, x, y)
    {
        var angle = ma.atan((y - cy) / (x - cx));
            angle = ma.abs(angle)

        if (x >= cx && y >= cy) {
            angle += RG.TWOPI;

        } else if (x >= cx && y < cy) {
            angle = (RG.HALFPI - angle) + (RG.PI + RG.HALFPI);

        } else if (x < cx && y < cy) {
            angle += RG.PI;

        } else {
            angle = RG.PI - angle;
        }

        /**
        * Upper and lower limit checking
        */
        if (angle > RG.TWOPI) {
            angle -= RG.TWOPI;
        }

        return angle;
    };




    /**
    * This function returns the distance between two points. In effect the
    * radius of an imaginary circle that is centered on x1 and y1. The name
    * of this function is derived from the word "Hypoteneuse", which in
    * trigonmetry is the longest side of a triangle
    * 
    * @param number x1 The original X coordinate
    * @param number y1 The original Y coordinate
    * @param number x2 The target X coordinate
    * @param number y2 The target Y  coordinate
    */
    RG.getHypLength = function (x1, y1, x2, y2)
    {
        var ret = ma.sqrt(((x2 - x1) * (x2 - x1)) + ((y2 - y1) * (y2 - y1)));

        return ret;
    };




    /**
    * This function gets the end point (X/Y coordinates) of a given radius.
    * You pass it the center X/Y and the radius and this function will return
    * the endpoint X/Y coordinates.
    * 
    * @param number cx The center X coord
    * @param number cy The center Y coord
    * @param number r  The lrngth of the radius
    */
    RG.getRadiusEndPoint = function (cx, cy, angle, radius)
    {
        var x = cx + (ma.cos(angle) * radius);
        var y = cy + (ma.sin(angle) * radius);
        
        return [x, y];
    };




    /**
    * This installs all of the event listeners
    * 
    * @param object obj The chart object
    */
    RG.installEventListeners =
    RG.InstallEventListeners = function (obj)
    {
        var prop = obj.properties;

        /**
        * Don't attempt to install event listeners for older versions of MSIE
        */
        if (RG.ISOLD) {
            return;
        }

        /**
        * If this function exists, then the dynamic file has been included.
        */
        if (RG.installCanvasClickListener) {

            RG.installWindowMousedownListener(obj);
            RG.installWindowMouseupListener(obj);
            RG.installCanvasMousemoveListener(obj);
            RG.installCanvasMouseupListener(obj);
            RG.installCanvasMousedownListener(obj);
            RG.installCanvasClickListener(obj);
        
        } else if (   RG.hasTooltips(obj)
                   || prop['chart.adjustable']
                   || prop['chart.annotatable']
                   || prop['chart.contextmenu']
                   || prop['chart.resizable']
                   || prop['chart.key.interactive']
                   || prop['chart.events.click']
                   || prop['chart.events.mousemove']
                   || typeof obj.onclick === 'function'
                   || typeof obj.onmousemove === 'function'
                  ) {

            alert('[RGRAPH] You appear to have used dynamic features but not included the file: RGraph.common.dynamic.js');
        }
    };