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339 lines
10 KiB
JavaScript
339 lines
10 KiB
JavaScript
/* Flot plugin for adding the ability to pan and zoom the plot.
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Copyright (c) 2007-2013 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 = $.plot(...);
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// zoom default amount in on the pixel ( 10, 20 )
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plot.zoom({ center: { left: 10, top: 20 } });
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// zoom out again
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plot.zoomOut({ center: { left: 10, top: 20 } });
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// zoom 200% in on the pixel (10, 20)
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plot.zoom({ amount: 2, center: { left: 10, top: 20 } });
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// pan 100 pixels to the left and 20 down
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plot.pan({ left: -100, top: 20 })
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Here, "center" specifies where the center of the zooming should happen. Note
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that this is defined in pixel space, not the space of the data points (you can
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use the p2c helpers on the axes in Flot to help you convert between these).
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"amount" is the amount to zoom the viewport relative to the current range, so
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1 is 100% (i.e. no change), 1.5 is 150% (zoom in), 0.7 is 70% (zoom out). You
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can set the default in the options.
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*/
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(function($) {
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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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}
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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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}
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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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}
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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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}
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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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dragEnded: false });
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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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dragEnded: true });
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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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}
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if (!args.amount) {
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args.amount = plot.getOptions().zoom.amount;
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}
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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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}
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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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}
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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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}
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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]) ||
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(zr[1] != null && range > zr[1]))) {
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return;
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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("plotzoom", [plot, args]);
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}
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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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}
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if (isNaN(delta.y)) {
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delta.y = 0;
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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 = axis.c2p(axis.p2c(axis.min) + d),
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max = axis.c2p(axis.p2c(axis.max) + d),
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d = delta[axis.direction],
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pr = opts.panRange;
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if (pr === false) { // no panning on this axis
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return;
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}
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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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};
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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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}
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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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