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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 | /* Flot plugin for selecting regions. The plugin defines the following options: selection: { mode: null or "x" or "y" or "xy", color: color } You enable selection support 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. 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 one extra 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, secondary axes are in x2axis // and y2axis if present }); 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 (or x2axis) object, if the mode is "y" you need to put in an yaxis (or y2axis) object and both xaxis/x2axis and yaxis/y2axis 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. - 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 = {}; function onMouseMove(e) { if (selection.active) { plot.getPlaceholder().trigger("plotselecting", [ getSelection() ]); updateSelection(e); } } 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; $(document).one("mouseup", onMouseUp); } function onMouseUp(e) { // 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 draggy-dee-drag 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 x1 = Math.min(selection.first.x, selection.second.x), x2 = Math.max(selection.first.x, selection.second.x), y1 = Math.max(selection.first.y, selection.second.y), y2 = Math.min(selection.first.y, selection.second.y); var r = {}; var axes = plot.getAxes(); if (axes.xaxis.used) r.xaxis = { from: axes.xaxis.c2p(x1), to: axes.xaxis.c2p(x2) }; if (axes.x2axis.used) r.x2axis = { from: axes.x2axis.c2p(x1), to: axes.x2axis.c2p(x2) }; if (axes.yaxis.used) r.yaxis = { from: axes.yaxis.c2p(y1), to: axes.yaxis.c2p(y2) }; if (axes.y2axis.used) r.y2axis = { from: axes.y2axis.c2p(y1), to: axes.y2axis.c2p(y2) }; return r; } function triggerSelectedEvent() { var r = getSelection(); plot.getPlaceholder().trigger("plotselected", [ r ]); // backwards-compat stuff, to be removed in future var axes = plot.getAxes(); if (axes.xaxis.used && axes.yaxis.used) 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 setSelection(ranges, preventEvent) { var axis, range, axes = plot.getAxes(); var o = plot.getOptions(); if (o.selection.mode == "y") { selection.first.x = 0; selection.second.x = plot.width(); } else { axis = ranges["xaxis"]? axes["xaxis"]: (ranges["x2axis"]? axes["x2axis"]: axes["xaxis"]); range = ranges["xaxis"] || ranges["x2axis"] || { from:ranges["x1"], to:ranges["x2"] } selection.first.x = axis.p2c(Math.min(range.from, range.to)); selection.second.x = axis.p2c(Math.max(range.from, range.to)); } if (o.selection.mode == "x") { selection.first.y = 0; selection.second.y = plot.height(); } else { axis = ranges["yaxis"]? axes["yaxis"]: (ranges["y2axis"]? axes["y2axis"]: axes["yaxis"]); range = ranges["yaxis"] || ranges["y2axis"] || { from:ranges["y1"], to:ranges["y2"] } selection.first.y = axis.p2c(Math.min(range.from, range.to)); selection.second.y = axis.p2c(Math.max(range.from, range.to)); } selection.show = true; plot.triggerRedrawOverlay(); if (!preventEvent) 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); if (o.selection.mode != null) 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.plugins.push({ init: init, options: { selection: { mode: null, // one of null, "x", "y" or "xy" color: "#e8cfac" } }, name: 'selection', version: '1.0' }); })(jQuery); |