347 lines
14 KiB
JavaScript
347 lines
14 KiB
JavaScript
/* Flot plugin for adding the ability to pan and zoom the plot.
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Copyright (c) 2007-2014 IOLA and Ole Laursen.
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Licensed under the MIT license.
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The default behaviour is double click and scrollwheel up/down to zoom in, drag
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to pan. The plugin defines plot.zoom({ center }), plot.zoomOut() and
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plot.pan( offset ) so you easily can add custom controls. It also fires
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"plotpan" and "plotzoom" events, useful for synchronizing plots.
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The plugin supports these options:
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zoom: {
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interactive: false
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trigger: "dblclick" // or "click" for single click
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amount: 1.5 // 2 = 200% (zoom in), 0.5 = 50% (zoom out)
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}
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pan: {
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interactive: false
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cursor: "move" // CSS mouse cursor value used when dragging, e.g. "pointer"
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frameRate: 20
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}
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xaxis, yaxis, x2axis, y2axis: {
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zoomRange: null // or [ number, number ] (min range, max range) or false
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panRange: null // or [ number, number ] (min, max) or false
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}
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"interactive" enables the built-in drag/click behaviour. If you enable
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interactive for pan, then you'll have a basic plot that supports moving
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around; the same for zoom.
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"amount" specifies the default amount to zoom in (so 1.5 = 150%) relative to
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the current viewport.
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"cursor" is a standard CSS mouse cursor string used for visual feedback to the
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user when dragging.
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"frameRate" specifies the maximum number of times per second the plot will
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update itself while the user is panning around on it (set to null to disable
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intermediate pans, the plot will then not update until the mouse button is
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released).
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"zoomRange" is the interval in which zooming can happen, e.g. with zoomRange:
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[1, 100] the zoom will never scale the axis so that the difference between min
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and max is smaller than 1 or larger than 100. You can set either end to null
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to ignore, e.g. [1, null]. If you set zoomRange to false, zooming on that axis
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will be disabled.
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"panRange" confines the panning to stay within a range, e.g. with panRange:
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[-10, 20] panning stops at -10 in one end and at 20 in the other. Either can
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be null, e.g. [-10, null]. If you set panRange to false, panning on that axis
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will be disabled.
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Example API usage:
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plot = $.plot(...);
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// zoom default amount in on the pixel ( 10, 20 )
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plot.zoom({ center: { left: 10, top: 20 } });
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// zoom out again
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plot.zoomOut({ center: { left: 10, top: 20 } });
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// zoom 200% in on the pixel (10, 20)
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plot.zoom({ amount: 2, center: { left: 10, top: 20 } });
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// pan 100 pixels to the left and 20 down
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plot.pan({ left: -100, top: 20 })
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Here, "center" specifies where the center of the zooming should happen. Note
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that this is defined in pixel space, not the space of the data points (you can
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use the p2c helpers on the axes in Flot to help you convert between these).
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"amount" is the amount to zoom the viewport relative to the current range, so
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1 is 100% (i.e. no change), 1.5 is 150% (zoom in), 0.7 is 70% (zoom out). You
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can set the default in the options.
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*/
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// First two dependencies, jquery.event.drag.js and
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// jquery.mousewheel.js, we put them inline here to save people the
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// effort of downloading them.
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/*
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jquery.event.drag.js ~ v1.5 ~ Copyright (c) 2008, Three Dub Media (http://threedubmedia.com)
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Licensed under the MIT License ~ http://threedubmedia.googlecode.com/files/MIT-LICENSE.txt
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*/
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(function(a){function e(h){var k,j=this,l=h.data||{};if(l.elem)j=h.dragTarget=l.elem,h.dragProxy=d.proxy||j,h.cursorOffsetX=l.pageX-l.left,h.cursorOffsetY=l.pageY-l.top,h.offsetX=h.pageX-h.cursorOffsetX,h.offsetY=h.pageY-h.cursorOffsetY;else if(d.dragging||l.which>0&&h.which!=l.which||a(h.target).is(l.not))return;switch(h.type){case"mousedown":return a.extend(l,a(j).offset(),{elem:j,target:h.target,pageX:h.pageX,pageY:h.pageY}),b.add(document,"mousemove mouseup",e,l),i(j,!1),d.dragging=null,!1;case!d.dragging&&"mousemove":if(g(h.pageX-l.pageX)+g(h.pageY-l.pageY)<l.distance)break;h.target=l.target,k=f(h,"dragstart",j),k!==!1&&(d.dragging=j,d.proxy=h.dragProxy=a(k||j)[0]);case"mousemove":if(d.dragging){if(k=f(h,"drag",j),c.drop&&(c.drop.allowed=k!==!1,c.drop.handler(h)),k!==!1)break;h.type="mouseup"}case"mouseup":b.remove(document,"mousemove mouseup",e),d.dragging&&(c.drop&&c.drop.handler(h),f(h,"dragend",j)),i(j,!0),d.dragging=d.proxy=l.elem=!1}return!0}function f(b,c,d){b.type=c;var e=a.event.dispatch.call(d,b);return e===!1?!1:e||b.result}function g(a){return Math.pow(a,2)}function h(){return d.dragging===!1}function i(a,b){a&&(a.unselectable=b?"off":"on",a.onselectstart=function(){return b},a.style&&(a.style.MozUserSelect=b?"":"none"))}a.fn.drag=function(a,b,c){return b&&this.bind("dragstart",a),c&&this.bind("dragend",c),a?this.bind("drag",b?b:a):this.trigger("drag")};var b=a.event,c=b.special,d=c.drag={not:":input",distance:0,which:1,dragging:!1,setup:function(c){c=a.extend({distance:d.distance,which:d.which,not:d.not},c||{}),c.distance=g(c.distance),b.add(this,"mousedown",e,c),this.attachEvent&&this.attachEvent("ondragstart",h)},teardown:function(){b.remove(this,"mousedown",e),this===d.dragging&&(d.dragging=d.proxy=!1),i(this,!0),this.detachEvent&&this.detachEvent("ondragstart",h)}};c.dragstart=c.dragend={setup:function(){},teardown:function(){}}})(jQuery);
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/* jquery.mousewheel.min.js
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* Copyright (c) 2011 Brandon Aaron (http://brandonaaron.net)
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* Licensed under the MIT License (LICENSE.txt).
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* Thanks to: http://adomas.org/javascript-mouse-wheel/ for some pointers.
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* Thanks to: Mathias Bank(http://www.mathias-bank.de) for a scope bug fix.
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* Thanks to: Seamus Leahy for adding deltaX and deltaY
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*
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* Version: 3.0.6
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*
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* Requires: 1.2.2+
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*/
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(function(d){function e(a){var b=a||window.event,c=[].slice.call(arguments,1),f=0,e=0,g=0,a=d.event.fix(b);a.type="mousewheel";b.wheelDelta&&(f=b.wheelDelta/120);b.detail&&(f=-b.detail/3);g=f;void 0!==b.axis&&b.axis===b.HORIZONTAL_AXIS&&(g=0,e=-1*f);void 0!==b.wheelDeltaY&&(g=b.wheelDeltaY/120);void 0!==b.wheelDeltaX&&(e=-1*b.wheelDeltaX/120);c.unshift(a,f,e,g);return(d.event.dispatch||d.event.handle).apply(this,c)}var c=["DOMMouseScroll","mousewheel"];if(d.event.fixHooks)for(var h=c.length;h;)d.event.fixHooks[c[--h]]=d.event.mouseHooks;d.event.special.mousewheel={setup:function(){if(this.addEventListener)for(var a=c.length;a;)this.addEventListener(c[--a],e,!1);else this.onmousewheel=e},teardown:function(){if(this.removeEventListener)for(var a=c.length;a;)this.removeEventListener(c[--a],e,!1);else this.onmousewheel=null}};d.fn.extend({mousewheel:function(a){return a?this.bind("mousewheel",a):this.trigger("mousewheel")},unmousewheel:function(a){return this.unbind("mousewheel",a)}})})(jQuery);
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(function ($) {
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var options = {
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xaxis: {
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zoomRange: null, // or [number, number] (min range, max range)
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panRange: null // or [number, number] (min, max)
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},
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zoom: {
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interactive: false,
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trigger: "dblclick", // or "click" for single click
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amount: 1.5 // how much to zoom relative to current position, 2 = 200% (zoom in), 0.5 = 50% (zoom out)
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},
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pan: {
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interactive: false,
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cursor: "move",
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frameRate: 20
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}
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};
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function init(plot) {
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function onZoomClick(e, zoomOut) {
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var c = plot.offset();
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c.left = e.pageX - c.left;
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c.top = e.pageY - c.top;
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if (zoomOut)
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plot.zoomOut({ center: c });
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else
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plot.zoom({ center: c });
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}
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function onMouseWheel(e, delta) {
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e.preventDefault();
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onZoomClick(e, delta < 0);
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return false;
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}
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var prevCursor = 'default', prevPageX = 0, prevPageY = 0,
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panTimeout = null;
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function onDragStart(e) {
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if (e.which != 1) // only accept left-click
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return false;
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var c = plot.getPlaceholder().css('cursor');
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if (c)
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prevCursor = c;
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plot.getPlaceholder().css('cursor', plot.getOptions().pan.cursor);
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prevPageX = e.pageX;
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prevPageY = e.pageY;
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}
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function onDrag(e) {
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var frameRate = plot.getOptions().pan.frameRate;
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if (panTimeout || !frameRate)
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return;
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panTimeout = setTimeout(function () {
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plot.pan({ left: prevPageX - e.pageX,
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top: prevPageY - e.pageY });
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prevPageX = e.pageX;
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prevPageY = e.pageY;
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panTimeout = null;
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}, 1 / frameRate * 1000);
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}
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function onDragEnd(e) {
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if (panTimeout) {
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clearTimeout(panTimeout);
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panTimeout = null;
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}
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plot.getPlaceholder().css('cursor', prevCursor);
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plot.pan({ left: prevPageX - e.pageX,
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top: prevPageY - e.pageY });
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}
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function bindEvents(plot, eventHolder) {
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var o = plot.getOptions();
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if (o.zoom.interactive) {
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eventHolder[o.zoom.trigger](onZoomClick);
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eventHolder.mousewheel(onMouseWheel);
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}
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if (o.pan.interactive) {
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eventHolder.bind("dragstart", { distance: 10 }, onDragStart);
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eventHolder.bind("drag", onDrag);
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eventHolder.bind("dragend", onDragEnd);
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}
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}
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plot.zoomOut = function (args) {
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if (!args)
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args = {};
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if (!args.amount)
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args.amount = plot.getOptions().zoom.amount;
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args.amount = 1 / args.amount;
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plot.zoom(args);
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};
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plot.zoom = function (args) {
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if (!args)
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args = {};
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var c = args.center,
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amount = args.amount || plot.getOptions().zoom.amount,
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w = plot.width(), h = plot.height();
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if (!c)
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c = { left: w / 2, top: h / 2 };
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var xf = c.left / w,
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yf = c.top / h,
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minmax = {
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x: {
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min: c.left - xf * w / amount,
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max: c.left + (1 - xf) * w / amount
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},
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y: {
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min: c.top - yf * h / amount,
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max: c.top + (1 - yf) * h / amount
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}
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};
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$.each(plot.getAxes(), function(_, axis) {
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var opts = axis.options,
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min = minmax[axis.direction].min,
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max = minmax[axis.direction].max,
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zr = opts.zoomRange,
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pr = opts.panRange;
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if (zr === false) // no zooming on this axis
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return;
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min = axis.c2p(min);
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max = axis.c2p(max);
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if (min > max) {
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// make sure min < max
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var tmp = min;
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min = max;
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max = tmp;
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}
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//Check that we are in panRange
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if (pr) {
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if (pr[0] != null && min < pr[0]) {
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min = pr[0];
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}
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if (pr[1] != null && max > pr[1]) {
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max = pr[1];
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}
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}
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var range = max - min;
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if (zr &&
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((zr[0] != null && range < zr[0] && amount >1) ||
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(zr[1] != null && range > zr[1] && amount <1)))
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return;
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opts.min = min;
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opts.max = max;
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});
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plot.setupGrid();
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plot.draw();
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if (!args.preventEvent)
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plot.getPlaceholder().trigger("plotzoom", [ plot, args ]);
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};
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plot.pan = function (args) {
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var delta = {
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x: +args.left,
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y: +args.top
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};
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if (isNaN(delta.x))
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delta.x = 0;
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if (isNaN(delta.y))
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delta.y = 0;
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$.each(plot.getAxes(), function (_, axis) {
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var opts = axis.options,
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min, max, d = delta[axis.direction];
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min = axis.c2p(axis.p2c(axis.min) + d),
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max = axis.c2p(axis.p2c(axis.max) + d);
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var pr = opts.panRange;
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if (pr === false) // no panning on this axis
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return;
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if (pr) {
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// check whether we hit the wall
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if (pr[0] != null && pr[0] > min) {
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d = pr[0] - min;
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min += d;
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max += d;
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}
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if (pr[1] != null && pr[1] < max) {
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d = pr[1] - max;
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min += d;
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max += d;
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}
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}
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opts.min = min;
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opts.max = max;
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});
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plot.setupGrid();
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plot.draw();
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if (!args.preventEvent)
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plot.getPlaceholder().trigger("plotpan", [ plot, args ]);
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};
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function shutdown(plot, eventHolder) {
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eventHolder.unbind(plot.getOptions().zoom.trigger, onZoomClick);
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eventHolder.unbind("mousewheel", onMouseWheel);
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eventHolder.unbind("dragstart", onDragStart);
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eventHolder.unbind("drag", onDrag);
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eventHolder.unbind("dragend", onDragEnd);
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if (panTimeout)
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clearTimeout(panTimeout);
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}
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plot.hooks.bindEvents.push(bindEvents);
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plot.hooks.shutdown.push(shutdown);
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}
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$.plot.plugins.push({
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init: init,
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options: options,
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name: 'navigate',
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version: '1.3'
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});
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})(jQuery);
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