EPSIAE » eneraptor

/*

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 (c) 2008, Three Dub Media (http://threedubmedia.com)  

Licensed under the MIT License ~ http://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)[0]}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(c){var a=["DOMMouseScroll","mousewheel"];c.event.special.mousewheel={setup:function(){if(this.addEventListener){for(var d=a.length;d;){this.addEventListener(a[--d],b,false)}}else{this.onmousewheel=b}},teardown:function(){if(this.removeEventListener){for(var d=a.length;d;){this.removeEventListener(a[--d],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);