www/plugins-dist/statistiques/javascript/jquery.flot.selection.js

   1 /*
   2 Flot plugin for selecting regions.
   3
   4 The plugin defines the following options:
   5
   6   selection: {
   7     mode: null or "x" or "y" or "xy",
   8     color: color
   9   }
  10
  11 Selection support is enabled by setting the mode to one of "x", "y" or
  12 "xy". In "x" mode, the user will only be able to specify the x range,
  13 similarly for "y" mode. For "xy", the selection becomes a rectangle
  14 where both ranges can be specified. "color" is color of the selection
  15 (if you need to change the color later on, you can get to it with
  16 plot.getOptions().selection.color).
  17
  18 When selection support is enabled, a "plotselected" event will be
  19 emitted on the DOM element you passed into the plot function. The
  20 event handler gets a parameter with the ranges selected on the axes,
  21 like this:
  22
  23   placeholder.bind("plotselected", function(event, ranges) {
  24     alert("You selected " + ranges.xaxis.from + " to " + ranges.xaxis.to)
  25     // similar for yaxis - with multiple axes, the extra ones are in
  26     // x2axis, x3axis, ...
  27   });
  28
  29 The "plotselected" event is only fired when the user has finished
  30 making the selection. A "plotselecting" event is fired during the
  31 process with the same parameters as the "plotselected" event, in case
  32 you want to know what's happening while it's happening,
  33
  34 A "plotunselected" event with no arguments is emitted when the user
  35 clicks the mouse to remove the selection.
  36
  37 The plugin allso adds the following methods to the plot object:
  38
  39 - setSelection(ranges, preventEvent)
  40
  41   Set the selection rectangle. The passed in ranges is on the same
  42   form as returned in the "plotselected" event. If the selection mode
  43   is "x", you should put in either an xaxis range, if the mode is "y"
  44   you need to put in an yaxis range and both xaxis and yaxis if the
  45   selection mode is "xy", like this:
  46
  47     setSelection({ xaxis: { from: 0, to: 10 }, yaxis: { from: 40, to: 60 } });
  48
  49   setSelection will trigger the "plotselected" event when called. If
  50   you don't want that to happen, e.g. if you're inside a
  51   "plotselected" handler, pass true as the second parameter. If you
  52   are using multiple axes, you can specify the ranges on any of those,
  53   e.g. as x2axis/x3axis/... instead of xaxis, the plugin picks the
  54   first one it sees.
  55
  56 - clearSelection(preventEvent)
  57
  58   Clear the selection rectangle. Pass in true to avoid getting a
  59   "plotunselected" event.
  60
  61 - getSelection()
  62
  63   Returns the current selection in the same format as the
  64   "plotselected" event. If there's currently no selection, the
  65   function returns null.
  66
  67 */
  68
  69 (function ($) {
  70     function init(plot) {
  71         var selection = {
  72                 first: { x: -1, y: -1}, second: { x: -1, y: -1},
  73                 show: false,
  74                 active: false
  75             };
  76
  77         // FIXME: The drag handling implemented here should be
  78         // abstracted out, there's some similar code from a library in
  79         // the navigation plugin, this should be massaged a bit to fit
  80         // the Flot cases here better and reused. Doing this would
  81         // make this plugin much slimmer.
  82         var savedhandlers = {};
  83
  84         var mouseUpHandler = null;
  85
  86         function onMouseMove(e) {
  87             if (selection.active) {
  88                 updateSelection(e);
  89
  90                 plot.getPlaceholder().trigger("plotselecting", [ getSelection() ]);
  91             }
  92         }
  93
  94         function onMouseDown(e) {
  95             if (e.which != 1)  // only accept left-click
  96                 return;
  97
  98             // cancel out any text selections
  99             document.body.focus();
 100
 101             // prevent text selection and drag in old-school browsers
 102             if (document.onselectstart !== undefined && savedhandlers.onselectstart == null) {
 103                 savedhandlers.onselectstart = document.onselectstart;
 104                 document.onselectstart = function () { return false; };
 105             }
 106             if (document.ondrag !== undefined && savedhandlers.ondrag == null) {
 107                 savedhandlers.ondrag = document.ondrag;
 108                 document.ondrag = function () { return false; };
 109             }
 110
 111             setSelectionPos(selection.first, e);
 112
 113             selection.active = true;
 114
 115             // this is a bit silly, but we have to use a closure to be
 116             // able to whack the same handler again
 117             mouseUpHandler = function (e) { onMouseUp(e); };
 118
 119             $(document).one("mouseup", mouseUpHandler);
 120         }
 121
 122         function onMouseUp(e) {
 123             mouseUpHandler = null;
 124
 125             // revert drag stuff for old-school browsers
 126             if (document.onselectstart !== undefined)
 127                 document.onselectstart = savedhandlers.onselectstart;
 128             if (document.ondrag !== undefined)
 129                 document.ondrag = savedhandlers.ondrag;
 130
 131             // no more dragging
 132             selection.active = false;
 133             updateSelection(e);
 134
 135             if (selectionIsSane())
 136                 triggerSelectedEvent();
 137             else {
 138                 // this counts as a clear
 139                 plot.getPlaceholder().trigger("plotunselected", [ ]);
 140                 plot.getPlaceholder().trigger("plotselecting", [ null ]);
 141             }
 142
 143             return false;
 144         }
 145
 146         function getSelection() {
 147             if (!selectionIsSane())
 148                 return null;
 149
 150             var r = {}, c1 = selection.first, c2 = selection.second;
 151             $.each(plot.getAxes(), function (name, axis) {
 152                 if (axis.used) {
 153                     var p1 = axis.c2p(c1[axis.direction]), p2 = axis.c2p(c2[axis.direction]);
 154                     r[name] = { from: Math.min(p1, p2), to: Math.max(p1, p2) };
 155                 }
 156             });
 157             return r;
 158         }
 159
 160         function triggerSelectedEvent() {
 161             var r = getSelection();
 162
 163             plot.getPlaceholder().trigger("plotselected", [ r ]);
 164
 165             // backwards-compat stuff, to be removed in future
 166             if (r.xaxis && r.yaxis)
 167                 plot.getPlaceholder().trigger("selected", [ { x1: r.xaxis.from, y1: r.yaxis.from, x2: r.xaxis.to, y2: r.yaxis.to } ]);
 168         }
 169
 170         function clamp(min, value, max) {
 171             return value < min ? min: (value > max ? max: value);
 172         }
 173
 174         function setSelectionPos(pos, e) {
 175             var o = plot.getOptions();
 176             var offset = plot.getPlaceholder().offset();
 177             var plotOffset = plot.getPlotOffset();
 178             pos.x = clamp(0, e.pageX - offset.left - plotOffset.left, plot.width());
 179             pos.y = clamp(0, e.pageY - offset.top - plotOffset.top, plot.height());
 180
 181             if (o.selection.mode == "y")
 182                 pos.x = pos == selection.first ? 0 : plot.width();
 183
 184             if (o.selection.mode == "x")
 185                 pos.y = pos == selection.first ? 0 : plot.height();
 186         }
 187
 188         function updateSelection(pos) {
 189             if (pos.pageX == null)
 190                 return;
 191
 192             setSelectionPos(selection.second, pos);
 193             if (selectionIsSane()) {
 194                 selection.show = true;
 195                 plot.triggerRedrawOverlay();
 196             }
 197             else
 198                 clearSelection(true);
 199         }
 200
 201         function clearSelection(preventEvent) {
 202             if (selection.show) {
 203                 selection.show = false;
 204                 plot.triggerRedrawOverlay();
 205                 if (!preventEvent)
 206                     plot.getPlaceholder().trigger("plotunselected", [ ]);
 207             }
 208         }
 209
 210         // function taken from markings support in Flot
 211         function extractRange(ranges, coord) {
 212             var axis, from, to, key, axes = plot.getAxes();
 213
 214             for (var k in axes) {
 215                 axis = axes[k];
 216                 if (axis.direction == coord) {
 217                     key = coord + axis.n + "axis";
 218                     if (!ranges[key] && axis.n == 1)
 219                         key = coord + "axis"; // support x1axis as xaxis
 220                     if (ranges[key]) {
 221                         from = ranges[key].from;
 222                         to = ranges[key].to;
 223                         break;
 224                     }
 225                 }
 226             }
 227
 228             // backwards-compat stuff - to be removed in future
 229             if (!ranges[key]) {
 230                 axis = coord == "x" ? plot.getXAxes()[0] : plot.getYAxes()[0];
 231                 from = ranges[coord + "1"];
 232                 to = ranges[coord + "2"];
 233             }
 234
 235             // auto-reverse as an added bonus
 236             if (from != null && to != null && from > to) {
 237                 var tmp = from;
 238                 from = to;
 239                 to = tmp;
 240             }
 241
 242             return { from: from, to: to, axis: axis };
 243         }
 244
 245         function setSelection(ranges, preventEvent) {
 246             var axis, range, o = plot.getOptions();
 247
 248             if (o.selection.mode == "y") {
 249                 selection.first.x = 0;
 250                 selection.second.x = plot.width();
 251             }
 252             else {
 253                 range = extractRange(ranges, "x");
 254
 255                 selection.first.x = range.axis.p2c(range.from);
 256                 selection.second.x = range.axis.p2c(range.to);
 257             }
 258
 259             if (o.selection.mode == "x") {
 260                 selection.first.y = 0;
 261                 selection.second.y = plot.height();
 262             }
 263             else {
 264                 range = extractRange(ranges, "y");
 265
 266                 selection.first.y = range.axis.p2c(range.from);
 267                 selection.second.y = range.axis.p2c(range.to);
 268             }
 269
 270             selection.show = true;
 271             plot.triggerRedrawOverlay();
 272             if (!preventEvent && selectionIsSane())
 273                 triggerSelectedEvent();
 274         }
 275
 276         function selectionIsSane() {
 277             var minSize = 5;
 278             return Math.abs(selection.second.x - selection.first.x) >= minSize &&
 279                 Math.abs(selection.second.y - selection.first.y) >= minSize;
 280         }
 281
 282         plot.clearSelection = clearSelection;
 283         plot.setSelection = setSelection;
 284         plot.getSelection = getSelection;
 285
 286         plot.hooks.bindEvents.push(function(plot, eventHolder) {
 287             var o = plot.getOptions();
 288             if (o.selection.mode != null) {
 289                 eventHolder.mousemove(onMouseMove);
 290                 eventHolder.mousedown(onMouseDown);
 291             }
 292         });
 293
 294
 295         plot.hooks.drawOverlay.push(function (plot, ctx) {
 296             // draw selection
 297             if (selection.show && selectionIsSane()) {
 298                 var plotOffset = plot.getPlotOffset();
 299                 var o = plot.getOptions();
 300
 301                 ctx.save();
 302                 ctx.translate(plotOffset.left, plotOffset.top);
 303
 304                 var c = $.color.parse(o.selection.color);
 305
 306                 ctx.strokeStyle = c.scale('a', 0.8).toString();
 307                 ctx.lineWidth = 1;
 308                 ctx.lineJoin = "round";
 309                 ctx.fillStyle = c.scale('a', 0.4).toString();
 310
 311                 var x = Math.min(selection.first.x, selection.second.x),
 312                     y = Math.min(selection.first.y, selection.second.y),
 313                     w = Math.abs(selection.second.x - selection.first.x),
 314                     h = Math.abs(selection.second.y - selection.first.y);
 315
 316                 ctx.fillRect(x, y, w, h);
 317                 ctx.strokeRect(x, y, w, h);
 318
 319                 ctx.restore();
 320             }
 321         });
 322
 323         plot.hooks.shutdown.push(function (plot, eventHolder) {
 324             eventHolder.unbind("mousemove", onMouseMove);
 325             eventHolder.unbind("mousedown", onMouseDown);
 326
 327             if (mouseUpHandler)
 328                 $(document).unbind("mouseup", mouseUpHandler);
 329         });
 330
 331     }
 332
 333     $.plot.plugins.push({
 334         init: init,
 335         options: {
 336             selection: {
 337                 mode: null, // one of null, "x", "y" or "xy"
 338                 color: "#e8cfac"
 339             }
 340         },
 341         name: 'selection',
 342         version: '1.1'
 343     });
 344 })(jQuery);