/* Flot plugin for adding panning and zooming capabilities to a plot.

The default behaviour is double click and scrollwheel up/down to zoom in, drag to pan. The plugin defines plot.zoom({ center }), plot.zoomOut() and plot.pan(offset) so you easily can add custom controls. It also fires a “plotpan” and “plotzoom” event when something happens, useful for synchronizing plots.

Example usage:

plot = $.plot(...);

// zoom default amount in on the pixel (100, 200) 
plot.zoom({ center: { left: 10, top: 20 } });

// zoom out again
plot.zoomOut({ center: { left: 10, top: 20 } });

// pan 100 pixels to the left and 20 down
plot.pan({ left: -100, top: 20 })

Options:

zoom: {
  interactive: false
  trigger: "dblclick" // or "click" for single click
  amount: 1.5         // 2 = 200% (zoom in), 0.5 = 50% (zoom out)
}

pan: {
  interactive: false
}

xaxis, yaxis, x2axis, y2axis: {
  zoomRange: null  // or [number, number] (min range, max range)
  panRange: null   // or [number, number] (min, max)
}

“interactive” enables the built-in drag/click behaviour. “amount” is the amount to zoom the viewport relative to the current range, so 1 is 100% (i.e. no change), 1.5 is 150% (zoom in), 0.7 is 70% (zoom out).

“zoomRange” is the interval in which zooming can happen, e.g. with zoomRange: [1, 100] the zoom will never scale the axis so that the difference between min and max is smaller than 1 or larger than 100. You can set either of them to null to ignore.

“panRange” confines the panning to stay within a range, e.g. with panRange: [-10, 20] panning stops at -10 in one end and at 20 in the other. Either can be null. */

// First two dependencies, jquery.event.drag.js and // jquery.mousewheel.js, we put them inline here to save people the // effort of downloading them.

/* jquery.event.drag.js ~ v1.5 ~ Copyright © 2008, Three Dub Media (threedubmedia.com)

Licensed under the MIT License ~ threedubmedia.googlecode.com/files/MIT-LICENSE.txt */ (function(E){E.fn.drag=function(L,K,J){if(K){this.bind(“dragstart”,L)}if(J){this.bind(“dragend”,J)}return !L?this.trigger(“drag”):this.bind(“drag”,K?K:L)};var A=E.event,B=A.special,F=B.drag={not:“:input”,distance:0,which:1,dragging:false,setup:function(J){J=E.extend({distance:F.distance,which:F.which,not:F.not},J||{});J.distance=I(J.distance);A.add(this,“mousedown”,H,J);if(this.attachEvent){this.attachEvent(“ondragstart”,D)}},teardown:function(){A.remove(this,“mousedown”,H);if(this===F.dragging){F.dragging=F.proxy=false}G(this,true);if(this.detachEvent){this.detachEvent(“ondragstart”,D)}}};B.dragstart=B.dragend={setup:function(){},teardown:function(){}};function H(L){var K=this,J,M=L.data||{};if(M.elem){K=L.dragTarget=M.elem;L.dragProxy=F.proxy||K;L.cursorOffsetX=M.pageX-M.left;L.cursorOffsetY=M.pageY-M.top;L.offsetX=L.pageX-L.cursorOffsetX;L.offsetY=L.pageY-L.cursorOffsetY}else{if(F.dragging||(M.which>0&&L.which!=M.which)||E(L.target).is(M.not)){return }}switch(L.type){case“mousedown”:E.extend(M,E(K).offset(),{elem:K,target:L.target,pageX:L.pageX,pageY:L.pageY});A.add(document,“mousemove mouseup”,H,M);G(K,false);F.dragging=null;return false;case !F.dragging&&“mousemove”:if(I(L.pageX-M.pageX)+I(L.pageY-M.pageY)<M.distance){break}L.target=M.target;J=C(L,“dragstart”,K);if(J!==false){F.dragging=K;F.proxy=L.dragProxy=E(J||K)}case“mousemove”:if(F.dragging){J=C(L,“drag”,K);if(B.drop){B.drop.allowed=(J!==false);B.drop.handler(L)}if(J!==false){break}L.type=“mouseup”}case“mouseup”:A.remove(document,“mousemove mouseup”,H);if(F.dragging){if(B.drop){B.drop.handler(L)}C(L,“dragend”,K)}G(K,true);F.dragging=F.proxy=M.elem=false;break}return true}function C(M,K,L){M.type=K;var J=E.event.handle.call(L,M);return J===false?false:J||M.result}function I(J){return Math.pow(J,2)}function D(){return(F.dragging===false)}function G(K,J){if(!K){return }K.unselectable=J?“off”:“on”;K.onselectstart=function(){return J};if(K.style){K.style.MozUserSelect=J?“”:“none”}}})(jQuery);

/* jquery.mousewheel.min.js

* Copyright (c) 2009 Brandon Aaron (http://brandonaaron.net)
* Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
* and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
* Thanks to: http://adomas.org/javascript-mouse-wheel/ for some pointers.
* Thanks to: Mathias Bank(http://www.mathias-bank.de) for a scope bug fix.
*
* Version: 3.0.2
* 
* Requires: 1.2.2+
*/

(function©{var a=;c.event.special.mousewheel={setup:function(){if(this.addEventListener){for(var d=a.length;d;){this.addEventListener(a,b,false)}}else{this.onmousewheel=b}},teardown:function(){if(this.removeEventListener){for(var d=a.length;d;){this.removeEventListener(a,b,false)}}else{this.onmousewheel=null}}};c.fn.extend({mousewheel:function(d){return d?this.bind(“mousewheel”,d):this.trigger(“mousewheel”)},unmousewheel:function(d){return this.unbind(“mousewheel”,d)}});function b(f){var d=[].slice.call(arguments,1),g=0,e=true;f=c.event.fix(f||window.event);f.type=“mousewheel”;if(f.wheelDelta){g=f.wheelDelta/120}if(f.detail){g=-f.detail/3}d.unshift(f,g);return c.event.handle.apply(this,d)}})(jQuery);

(function ($) {

var options = {
    xaxis: {
        zoomRange: null, // or [number, number] (min range, max range)
        panRange: null // or [number, number] (min, max)
    },
    zoom: {
        interactive: false,
        trigger: "dblclick", // or "click" for single click
        amount: 1.5 // how much to zoom relative to current position, 2 = 200% (zoom in), 0.5 = 50% (zoom out)
    },
    pan: {
        interactive: false
    }
};

function init(plot) {
    function bindEvents(plot, eventHolder) {
        var o = plot.getOptions();
        if (o.zoom.interactive) {
            function clickHandler(e, zoomOut) {
                var c = plot.offset();
                c.left = e.pageX - c.left;
                c.top = e.pageY - c.top;
                if (zoomOut)
                    plot.zoomOut({ center: c });
                else
                    plot.zoom({ center: c });
            }

            eventHolder[o.zoom.trigger](clickHandler);

            eventHolder.mousewheel(function (e, delta) {
                clickHandler(e, delta < 0);
                return false;
            });
        }
        if (o.pan.interactive) {
            var prevCursor = 'default', pageX = 0, pageY = 0;

            eventHolder.bind("dragstart", { distance: 10 }, function (e) {
                if (e.which != 1)  // only accept left-click
                    return false;
                eventHolderCursor = eventHolder.css('cursor');
                eventHolder.css('cursor', 'move');
                pageX = e.pageX;
                pageY = e.pageY;
            });
            eventHolder.bind("drag", function (e) {
                // unused at the moment, but we need it here to
                // trigger the dragstart/dragend events
            });
            eventHolder.bind("dragend", function (e) {
                eventHolder.css('cursor', prevCursor);
                plot.pan({ left: pageX - e.pageX,
                           top: pageY - e.pageY });
            });
        }
    }

    plot.zoomOut = function (args) {
        if (!args)
            args = {};

        if (!args.amount)
            args.amount = plot.getOptions().zoom.amount

        args.amount = 1 / args.amount;
        plot.zoom(args);
    }

    plot.zoom = function (args) {
        if (!args)
            args = {};

        var axes = plot.getAxes(),
            options = plot.getOptions(),
            c = args.center,
            amount = args.amount ? args.amount : options.zoom.amount,
            w = plot.width(), h = plot.height();

        if (!c)
            c = { left: w / 2, top: h / 2 };

        var xf = c.left / w,
            x1 = c.left - xf * w / amount,
            x2 = c.left + (1 - xf) * w / amount,
            yf = c.top / h,
            y1 = c.top - yf * h / amount,
            y2 = c.top + (1 - yf) * h / amount;

        function scaleAxis(min, max, name) {
            var axis = axes[name],
                axisOptions = options[name];

            if (!axis.used)
                return;

            min = axis.c2p(min);
            max = axis.c2p(max);
            if (max < min) { // make sure min < max
                var tmp = min
                min = max;
                max = tmp;
            }

            var range = max - min, zr = axisOptions.zoomRange;
            if (zr &&
                ((zr[0] != null && range < zr[0]) ||
                 (zr[1] != null && range > zr[1])))
                return;

            axisOptions.min = min;
            axisOptions.max = max;
        }

        scaleAxis(x1, x2, 'xaxis');
        scaleAxis(x1, x2, 'x2axis');
        scaleAxis(y1, y2, 'yaxis');
        scaleAxis(y1, y2, 'y2axis');

        plot.setupGrid();
        plot.draw();

        if (!args.preventEvent)
            plot.getPlaceholder().trigger("plotzoom", [ plot ]);
    }

    plot.pan = function (args) {
        var l = +args.left, t = +args.top,
            axes = plot.getAxes(), options = plot.getOptions();

        if (isNaN(l))
            l = 0;
        if (isNaN(t))
            t = 0;

        function panAxis(delta, name) {
            var axis = axes[name],
                axisOptions = options[name],
                min, max;

            if (!axis.used)
                return;

            min = axis.c2p(axis.p2c(axis.min) + delta),
            max = axis.c2p(axis.p2c(axis.max) + delta);

            var pr = axisOptions.panRange;
            if (pr) {
                // check whether we hit the wall
                if (pr[0] != null && pr[0] > min) {
                    delta = pr[0] - min;
                    min += delta;
                    max += delta;
                }

                if (pr[1] != null && pr[1] < max) {
                    delta = pr[1] - max;
                    min += delta;
                    max += delta;
                }
            }

            axisOptions.min = min;
            axisOptions.max = max;
        }

        panAxis(l, 'xaxis');
        panAxis(l, 'x2axis');
        panAxis(t, 'yaxis');
        panAxis(t, 'y2axis');

        plot.setupGrid();
        plot.draw();

        if (!args.preventEvent)
            plot.getPlaceholder().trigger("plotpan", [ plot ]);
    }

    plot.hooks.bindEvents.push(bindEvents);
}

$.plot.plugins.push({
    init: init,
    options: options,
    name: 'navigate',
    version: '1.1'
});

})(jQuery);