| /* Flot plugin for selecting regions of a plot. |
| |
| Copyright (c) 2007-2012 IOLA and Ole Laursen. |
| Licensed under the MIT license. |
| |
| The plugin supports these options: |
| |
| selection: { |
| mode: null or "x" or "y" or "xy", |
| color: color |
| } |
| |
| Selection support is enabled by setting the mode to one of "x", "y" or "xy". |
| In "x" mode, the user will only be able to specify the x range, similarly for |
| "y" mode. For "xy", the selection becomes a rectangle where both ranges can be |
| specified. "color" is color of the selection (if you need to change the color |
| later on, you can get to it with plot.getOptions().selection.color). |
| |
| When selection support is enabled, a "plotselected" event will be emitted on |
| the DOM element you passed into the plot function. The event handler gets a |
| parameter with the ranges selected on the axes, like this: |
| |
| placeholder.bind( "plotselected", function( event, ranges ) { |
| alert("You selected " + ranges.xaxis.from + " to " + ranges.xaxis.to) |
| // similar for yaxis - with multiple axes, the extra ones are in |
| // x2axis, x3axis, ... |
| }); |
| |
| The "plotselected" event is only fired when the user has finished making the |
| selection. A "plotselecting" event is fired during the process with the same |
| parameters as the "plotselected" event, in case you want to know what's |
| happening while it's happening, |
| |
| A "plotunselected" event with no arguments is emitted when the user clicks the |
| mouse to remove the selection. |
| |
| The plugin allso adds the following methods to the plot object: |
| |
| - setSelection( ranges, preventEvent ) |
| |
| Set the selection rectangle. The passed in ranges is on the same form as |
| returned in the "plotselected" event. If the selection mode is "x", you |
| should put in either an xaxis range, if the mode is "y" you need to put in |
| an yaxis range and both xaxis and yaxis if the selection mode is "xy", like |
| this: |
| |
| setSelection({ xaxis: { from: 0, to: 10 }, yaxis: { from: 40, to: 60 } }); |
| |
| setSelection will trigger the "plotselected" event when called. If you don't |
| want that to happen, e.g. if you're inside a "plotselected" handler, pass |
| true as the second parameter. If you are using multiple axes, you can |
| specify the ranges on any of those, e.g. as x2axis/x3axis/... instead of |
| xaxis, the plugin picks the first one it sees. |
| |
| - clearSelection( preventEvent ) |
| |
| Clear the selection rectangle. Pass in true to avoid getting a |
| "plotunselected" event. |
| |
| - getSelection() |
| |
| Returns the current selection in the same format as the "plotselected" |
| event. If there's currently no selection, the function returns null. |
| |
| */ |
| |
| (function ($) { |
| function init(plot) { |
| var selection = { |
| first: { x: -1, y: -1}, second: { x: -1, y: -1}, |
| show: false, |
| active: false |
| }; |
| |
| // FIXME: The drag handling implemented here should be |
| // abstracted out, there's some similar code from a library in |
| // the navigation plugin, this should be massaged a bit to fit |
| // the Flot cases here better and reused. Doing this would |
| // make this plugin much slimmer. |
| var savedhandlers = {}; |
| |
| var mouseUpHandler = null; |
| |
| function onMouseMove(e) { |
| if (selection.active) { |
| updateSelection(e); |
| |
| plot.getPlaceholder().trigger("plotselecting", [ getSelection() ]); |
| } |
| } |
| |
| function onMouseDown(e) { |
| if (e.which != 1) // only accept left-click |
| return; |
| |
| // cancel out any text selections |
| document.body.focus(); |
| |
| // prevent text selection and drag in old-school browsers |
| if (document.onselectstart !== undefined && savedhandlers.onselectstart == null) { |
| savedhandlers.onselectstart = document.onselectstart; |
| document.onselectstart = function () { return false; }; |
| } |
| if (document.ondrag !== undefined && savedhandlers.ondrag == null) { |
| savedhandlers.ondrag = document.ondrag; |
| document.ondrag = function () { return false; }; |
| } |
| |
| setSelectionPos(selection.first, e); |
| |
| selection.active = true; |
| |
| // this is a bit silly, but we have to use a closure to be |
| // able to whack the same handler again |
| mouseUpHandler = function (e) { onMouseUp(e); }; |
| |
| $(document).one("mouseup", mouseUpHandler); |
| } |
| |
| function onMouseUp(e) { |
| mouseUpHandler = null; |
| |
| // revert drag stuff for old-school browsers |
| if (document.onselectstart !== undefined) |
| document.onselectstart = savedhandlers.onselectstart; |
| if (document.ondrag !== undefined) |
| document.ondrag = savedhandlers.ondrag; |
| |
| // no more dragging |
| selection.active = false; |
| updateSelection(e); |
| |
| if (selectionIsSane()) |
| triggerSelectedEvent(); |
| else { |
| // this counts as a clear |
| plot.getPlaceholder().trigger("plotunselected", [ ]); |
| plot.getPlaceholder().trigger("plotselecting", [ null ]); |
| } |
| |
| return false; |
| } |
| |
| function getSelection() { |
| if (!selectionIsSane()) |
| return null; |
| |
| if (!selection.show) return null; |
| |
| var r = {}, c1 = selection.first, c2 = selection.second; |
| $.each(plot.getAxes(), function (name, axis) { |
| if (axis.used) { |
| var p1 = axis.c2p(c1[axis.direction]), p2 = axis.c2p(c2[axis.direction]); |
| r[name] = { from: Math.min(p1, p2), to: Math.max(p1, p2) }; |
| } |
| }); |
| return r; |
| } |
| |
| function triggerSelectedEvent() { |
| var r = getSelection(); |
| |
| plot.getPlaceholder().trigger("plotselected", [ r ]); |
| |
| // backwards-compat stuff, to be removed in future |
| if (r.xaxis && r.yaxis) |
| plot.getPlaceholder().trigger("selected", [ { x1: r.xaxis.from, y1: r.yaxis.from, x2: r.xaxis.to, y2: r.yaxis.to } ]); |
| } |
| |
| function clamp(min, value, max) { |
| return value < min ? min: (value > max ? max: value); |
| } |
| |
| function setSelectionPos(pos, e) { |
| var o = plot.getOptions(); |
| var offset = plot.getPlaceholder().offset(); |
| var plotOffset = plot.getPlotOffset(); |
| pos.x = clamp(0, e.pageX - offset.left - plotOffset.left, plot.width()); |
| pos.y = clamp(0, e.pageY - offset.top - plotOffset.top, plot.height()); |
| |
| if (o.selection.mode == "y") |
| pos.x = pos == selection.first ? 0 : plot.width(); |
| |
| if (o.selection.mode == "x") |
| pos.y = pos == selection.first ? 0 : plot.height(); |
| } |
| |
| function updateSelection(pos) { |
| if (pos.pageX == null) |
| return; |
| |
| setSelectionPos(selection.second, pos); |
| if (selectionIsSane()) { |
| selection.show = true; |
| plot.triggerRedrawOverlay(); |
| } |
| else |
| clearSelection(true); |
| } |
| |
| function clearSelection(preventEvent) { |
| if (selection.show) { |
| selection.show = false; |
| plot.triggerRedrawOverlay(); |
| if (!preventEvent) |
| plot.getPlaceholder().trigger("plotunselected", [ ]); |
| } |
| } |
| |
| // function taken from markings support in Flot |
| function extractRange(ranges, coord) { |
| var axis, from, to, key, axes = plot.getAxes(); |
| |
| for (var k in axes) { |
| axis = axes[k]; |
| if (axis.direction == coord) { |
| key = coord + axis.n + "axis"; |
| if (!ranges[key] && axis.n == 1) |
| key = coord + "axis"; // support x1axis as xaxis |
| if (ranges[key]) { |
| from = ranges[key].from; |
| to = ranges[key].to; |
| break; |
| } |
| } |
| } |
| |
| // backwards-compat stuff - to be removed in future |
| if (!ranges[key]) { |
| axis = coord == "x" ? plot.getXAxes()[0] : plot.getYAxes()[0]; |
| from = ranges[coord + "1"]; |
| to = ranges[coord + "2"]; |
| } |
| |
| // auto-reverse as an added bonus |
| if (from != null && to != null && from > to) { |
| var tmp = from; |
| from = to; |
| to = tmp; |
| } |
| |
| return { from: from, to: to, axis: axis }; |
| } |
| |
| function setSelection(ranges, preventEvent) { |
| var axis, range, o = plot.getOptions(); |
| |
| if (o.selection.mode == "y") { |
| selection.first.x = 0; |
| selection.second.x = plot.width(); |
| } |
| else { |
| range = extractRange(ranges, "x"); |
| |
| selection.first.x = range.axis.p2c(range.from); |
| selection.second.x = range.axis.p2c(range.to); |
| } |
| |
| if (o.selection.mode == "x") { |
| selection.first.y = 0; |
| selection.second.y = plot.height(); |
| } |
| else { |
| range = extractRange(ranges, "y"); |
| |
| selection.first.y = range.axis.p2c(range.from); |
| selection.second.y = range.axis.p2c(range.to); |
| } |
| |
| selection.show = true; |
| plot.triggerRedrawOverlay(); |
| if (!preventEvent && selectionIsSane()) |
| triggerSelectedEvent(); |
| } |
| |
| function selectionIsSane() { |
| var minSize = 5; |
| return Math.abs(selection.second.x - selection.first.x) >= minSize && |
| Math.abs(selection.second.y - selection.first.y) >= minSize; |
| } |
| |
| plot.clearSelection = clearSelection; |
| plot.setSelection = setSelection; |
| plot.getSelection = getSelection; |
| |
| plot.hooks.bindEvents.push(function(plot, eventHolder) { |
| var o = plot.getOptions(); |
| if (o.selection.mode != null) { |
| eventHolder.mousemove(onMouseMove); |
| eventHolder.mousedown(onMouseDown); |
| } |
| }); |
| |
| |
| plot.hooks.drawOverlay.push(function (plot, ctx) { |
| // draw selection |
| if (selection.show && selectionIsSane()) { |
| var plotOffset = plot.getPlotOffset(); |
| var o = plot.getOptions(); |
| |
| ctx.save(); |
| ctx.translate(plotOffset.left, plotOffset.top); |
| |
| var c = $.color.parse(o.selection.color); |
| |
| ctx.strokeStyle = c.scale('a', 0.8).toString(); |
| ctx.lineWidth = 1; |
| ctx.lineJoin = "round"; |
| ctx.fillStyle = c.scale('a', 0.4).toString(); |
| |
| var x = Math.min(selection.first.x, selection.second.x) + 0.5, |
| y = Math.min(selection.first.y, selection.second.y) + 0.5, |
| w = Math.abs(selection.second.x - selection.first.x) - 1, |
| h = Math.abs(selection.second.y - selection.first.y) - 1; |
| |
| ctx.fillRect(x, y, w, h); |
| ctx.strokeRect(x, y, w, h); |
| |
| ctx.restore(); |
| } |
| }); |
| |
| plot.hooks.shutdown.push(function (plot, eventHolder) { |
| eventHolder.unbind("mousemove", onMouseMove); |
| eventHolder.unbind("mousedown", onMouseDown); |
| |
| if (mouseUpHandler) |
| $(document).unbind("mouseup", mouseUpHandler); |
| }); |
| |
| } |
| |
| $.plot.plugins.push({ |
| init: init, |
| options: { |
| selection: { |
| mode: null, // one of null, "x", "y" or "xy" |
| color: "#e8cfac" |
| } |
| }, |
| name: 'selection', |
| version: '1.1' |
| }); |
| })(jQuery); |
