--- a/lib/flot/jquery.flot.selection.js +++ b/lib/flot/jquery.flot.selection.js @@ -1,1 +1,345 @@ - +/* +Flot plugin for selecting regions. + +The plugin defines the following 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; + + 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), + y = Math.min(selection.first.y, selection.second.y), + w = Math.abs(selection.second.x - selection.first.x), + h = Math.abs(selection.second.y - selection.first.y); + + 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); +