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annotate geotemco/lib/flot/jquery.flot.selection.js @ 44:3163d8ca0b62 default

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closing default branch, we use extractapp branch
author Zoe Hong <zhong@mpiwg-berlin.mpg.de>
date Fri, 13 Mar 2015 09:55:07 +0100
parents b12c99b7c3f0
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1 /* Flot plugin for selecting regions of a plot.
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2
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3 Copyright (c) 2007-2013 IOLA and Ole Laursen.
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4 Licensed under the MIT license.
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5
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6 The plugin supports these options:
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7
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8 selection: {
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9 mode: null or "x" or "y" or "xy",
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10 color: color,
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11 shape: "round" or "miter" or "bevel",
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12 minSize: number of pixels
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13 }
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14
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15 Selection support is enabled by setting the mode to one of "x", "y" or "xy".
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16 In "x" mode, the user will only be able to specify the x range, similarly for
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17 "y" mode. For "xy", the selection becomes a rectangle where both ranges can be
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18 specified. "color" is color of the selection (if you need to change the color
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19 later on, you can get to it with plot.getOptions().selection.color). "shape"
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20 is the shape of the corners of the selection.
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21
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22 "minSize" is the minimum size a selection can be in pixels. This value can
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23 be customized to determine the smallest size a selection can be and still
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24 have the selection rectangle be displayed. When customizing this value, the
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25 fact that it refers to pixels, not axis units must be taken into account.
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26 Thus, for example, if there is a bar graph in time mode with BarWidth set to 1
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27 minute, setting "minSize" to 1 will not make the minimum selection size 1
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28 minute, but rather 1 pixel. Note also that setting "minSize" to 0 will prevent
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29 "plotunselected" events from being fired when the user clicks the mouse without
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30 dragging.
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31
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32 When selection support is enabled, a "plotselected" event will be emitted on
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33 the DOM element you passed into the plot function. The event handler gets a
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34 parameter with the ranges selected on the axes, like this:
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35
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36 placeholder.bind( "plotselected", function( event, ranges ) {
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37 alert("You selected " + ranges.xaxis.from + " to " + ranges.xaxis.to)
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38 // similar for yaxis - with multiple axes, the extra ones are in
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39 // x2axis, x3axis, ...
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40 });
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41
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42 The "plotselected" event is only fired when the user has finished making the
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43 selection. A "plotselecting" event is fired during the process with the same
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44 parameters as the "plotselected" event, in case you want to know what's
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45 happening while it's happening,
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46
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47 A "plotunselected" event with no arguments is emitted when the user clicks the
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48 mouse to remove the selection. As stated above, setting "minSize" to 0 will
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49 destroy this behavior.
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50
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51 The plugin allso adds the following methods to the plot object:
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52
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53 - setSelection( ranges, preventEvent )
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54
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55 Set the selection rectangle. The passed in ranges is on the same form as
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56 returned in the "plotselected" event. If the selection mode is "x", you
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57 should put in either an xaxis range, if the mode is "y" you need to put in
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58 an yaxis range and both xaxis and yaxis if the selection mode is "xy", like
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59 this:
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60
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61 setSelection({ xaxis: { from: 0, to: 10 }, yaxis: { from: 40, to: 60 } });
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62
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63 setSelection will trigger the "plotselected" event when called. If you don't
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64 want that to happen, e.g. if you're inside a "plotselected" handler, pass
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65 true as the second parameter. If you are using multiple axes, you can
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66 specify the ranges on any of those, e.g. as x2axis/x3axis/... instead of
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67 xaxis, the plugin picks the first one it sees.
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68
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69 - clearSelection( preventEvent )
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70
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71 Clear the selection rectangle. Pass in true to avoid getting a
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72 "plotunselected" event.
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73
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74 - getSelection()
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75
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76 Returns the current selection in the same format as the "plotselected"
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77 event. If there's currently no selection, the function returns null.
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78
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79 */
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80
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81 (function ($) {
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82 function init(plot) {
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83 var selection = {
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84 first: { x: -1, y: -1}, second: { x: -1, y: -1},
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85 show: false,
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86 active: false
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87 };
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88
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89 // FIXME: The drag handling implemented here should be
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90 // abstracted out, there's some similar code from a library in
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91 // the navigation plugin, this should be massaged a bit to fit
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92 // the Flot cases here better and reused. Doing this would
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93 // make this plugin much slimmer.
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94 var savedhandlers = {};
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95
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96 var mouseUpHandler = null;
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97
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98 function onMouseMove(e) {
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99 if (selection.active) {
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100 updateSelection(e);
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101
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102 plot.getPlaceholder().trigger("plotselecting", [ getSelection() ]);
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103 }
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104 }
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105
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106 function onMouseDown(e) {
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107 if (e.which != 1) // only accept left-click
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108 return;
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109
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110 // cancel out any text selections
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111 document.body.focus();
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112
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113 // prevent text selection and drag in old-school browsers
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114 if (document.onselectstart !== undefined && savedhandlers.onselectstart == null) {
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115 savedhandlers.onselectstart = document.onselectstart;
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116 document.onselectstart = function () { return false; };
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117 }
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118 if (document.ondrag !== undefined && savedhandlers.ondrag == null) {
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119 savedhandlers.ondrag = document.ondrag;
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120 document.ondrag = function () { return false; };
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121 }
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122
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123 setSelectionPos(selection.first, e);
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124
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125 selection.active = true;
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126
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127 // this is a bit silly, but we have to use a closure to be
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128 // able to whack the same handler again
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129 mouseUpHandler = function (e) { onMouseUp(e); };
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130
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131 $(document).one("mouseup", mouseUpHandler);
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132 }
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133
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134 function onMouseUp(e) {
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135 mouseUpHandler = null;
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136
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137 // revert drag stuff for old-school browsers
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138 if (document.onselectstart !== undefined)
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139 document.onselectstart = savedhandlers.onselectstart;
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140 if (document.ondrag !== undefined)
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141 document.ondrag = savedhandlers.ondrag;
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142
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143 // no more dragging
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144 selection.active = false;
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145 updateSelection(e);
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146
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147 if (selectionIsSane())
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148 triggerSelectedEvent();
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149 else {
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150 // this counts as a clear
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151 plot.getPlaceholder().trigger("plotunselected", [ ]);
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152 plot.getPlaceholder().trigger("plotselecting", [ null ]);
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153 }
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154
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155 return false;
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156 }
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157
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158 function getSelection() {
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159 if (!selectionIsSane())
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160 return null;
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161
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162 if (!selection.show) return null;
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163
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164 var r = {}, c1 = selection.first, c2 = selection.second;
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165 $.each(plot.getAxes(), function (name, axis) {
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166 if (axis.used) {
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167 var p1 = axis.c2p(c1[axis.direction]), p2 = axis.c2p(c2[axis.direction]);
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168 r[name] = { from: Math.min(p1, p2), to: Math.max(p1, p2) };
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169 }
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170 });
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171 return r;
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172 }
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173
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174 function triggerSelectedEvent() {
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175 var r = getSelection();
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176
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177 plot.getPlaceholder().trigger("plotselected", [ r ]);
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178
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179 // backwards-compat stuff, to be removed in future
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180 if (r.xaxis && r.yaxis)
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181 plot.getPlaceholder().trigger("selected", [ { x1: r.xaxis.from, y1: r.yaxis.from, x2: r.xaxis.to, y2: r.yaxis.to } ]);
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182 }
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183
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184 function clamp(min, value, max) {
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185 return value < min ? min: (value > max ? max: value);
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186 }
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187
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188 function setSelectionPos(pos, e) {
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189 var o = plot.getOptions();
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190 var offset = plot.getPlaceholder().offset();
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191 var plotOffset = plot.getPlotOffset();
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192 pos.x = clamp(0, e.pageX - offset.left - plotOffset.left, plot.width());
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193 pos.y = clamp(0, e.pageY - offset.top - plotOffset.top, plot.height());
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194
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195 if (o.selection.mode == "y")
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196 pos.x = pos == selection.first ? 0 : plot.width();
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197
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198 if (o.selection.mode == "x")
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199 pos.y = pos == selection.first ? 0 : plot.height();
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200 }
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201
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202 function updateSelection(pos) {
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203 if (pos.pageX == null)
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204 return;
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205
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206 setSelectionPos(selection.second, pos);
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207 if (selectionIsSane()) {
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208 selection.show = true;
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209 plot.triggerRedrawOverlay();
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210 }
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211 else
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212 clearSelection(true);
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213 }
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214
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215 function clearSelection(preventEvent) {
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216 if (selection.show) {
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217 selection.show = false;
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218 plot.triggerRedrawOverlay();
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219 if (!preventEvent)
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220 plot.getPlaceholder().trigger("plotunselected", [ ]);
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221 }
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222 }
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223
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224 // function taken from markings support in Flot
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225 function extractRange(ranges, coord) {
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226 var axis, from, to, key, axes = plot.getAxes();
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227
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228 for (var k in axes) {
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229 axis = axes[k];
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230 if (axis.direction == coord) {
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231 key = coord + axis.n + "axis";
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232 if (!ranges[key] && axis.n == 1)
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233 key = coord + "axis"; // support x1axis as xaxis
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234 if (ranges[key]) {
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235 from = ranges[key].from;
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236 to = ranges[key].to;
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237 break;
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238 }
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239 }
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240 }
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241
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242 // backwards-compat stuff - to be removed in future
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243 if (!ranges[key]) {
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244 axis = coord == "x" ? plot.getXAxes()[0] : plot.getYAxes()[0];
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245 from = ranges[coord + "1"];
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246 to = ranges[coord + "2"];
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247 }
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248
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249 // auto-reverse as an added bonus
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250 if (from != null && to != null && from > to) {
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251 var tmp = from;
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252 from = to;
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253 to = tmp;
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254 }
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255
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256 return { from: from, to: to, axis: axis };
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257 }
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258
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259 function setSelection(ranges, preventEvent) {
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260 var axis, range, o = plot.getOptions();
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261
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262 if (o.selection.mode == "y") {
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263 selection.first.x = 0;
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264 selection.second.x = plot.width();
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265 }
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266 else {
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267 range = extractRange(ranges, "x");
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268
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269 selection.first.x = range.axis.p2c(range.from);
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270 selection.second.x = range.axis.p2c(range.to);
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271 }
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272
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273 if (o.selection.mode == "x") {
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274 selection.first.y = 0;
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275 selection.second.y = plot.height();
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276 }
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277 else {
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278 range = extractRange(ranges, "y");
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279
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280 selection.first.y = range.axis.p2c(range.from);
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281 selection.second.y = range.axis.p2c(range.to);
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282 }
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283
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284 selection.show = true;
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285 plot.triggerRedrawOverlay();
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286 if (!preventEvent && selectionIsSane())
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287 triggerSelectedEvent();
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288 }
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289
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290 function selectionIsSane() {
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291 var minSize = plot.getOptions().selection.minSize;
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292 return Math.abs(selection.second.x - selection.first.x) >= minSize &&
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293 Math.abs(selection.second.y - selection.first.y) >= minSize;
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294 }
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295
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296 plot.clearSelection = clearSelection;
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297 plot.setSelection = setSelection;
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298 plot.getSelection = getSelection;
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299
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300 plot.hooks.bindEvents.push(function(plot, eventHolder) {
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301 var o = plot.getOptions();
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302 if (o.selection.mode != null) {
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303 eventHolder.mousemove(onMouseMove);
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304 eventHolder.mousedown(onMouseDown);
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305 }
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306 });
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307
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308
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309 plot.hooks.drawOverlay.push(function (plot, ctx) {
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310 // draw selection
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311 if (selection.show && selectionIsSane()) {
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312 var plotOffset = plot.getPlotOffset();
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313 var o = plot.getOptions();
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314
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315 ctx.save();
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316 ctx.translate(plotOffset.left, plotOffset.top);
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317
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318 var c = $.color.parse(o.selection.color);
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319
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320 ctx.strokeStyle = c.scale('a', 0.8).toString();
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321 ctx.lineWidth = 1;
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322 ctx.lineJoin = o.selection.shape;
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323 ctx.fillStyle = c.scale('a', 0.4).toString();
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324
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325 var x = Math.min(selection.first.x, selection.second.x) + 0.5,
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326 y = Math.min(selection.first.y, selection.second.y) + 0.5,
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327 w = Math.abs(selection.second.x - selection.first.x) - 1,
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328 h = Math.abs(selection.second.y - selection.first.y) - 1;
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329
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330 ctx.fillRect(x, y, w, h);
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331 ctx.strokeRect(x, y, w, h);
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332
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333 ctx.restore();
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334 }
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335 });
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336
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337 plot.hooks.shutdown.push(function (plot, eventHolder) {
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338 eventHolder.unbind("mousemove", onMouseMove);
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339 eventHolder.unbind("mousedown", onMouseDown);
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340
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341 if (mouseUpHandler)
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342 $(document).unbind("mouseup", mouseUpHandler);
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343 });
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344
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345 }
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346
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347 $.plot.plugins.push({
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348 init: init,
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349 options: {
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350 selection: {
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351 mode: null, // one of null, "x", "y" or "xy"
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352 color: "#e8cfac",
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353 shape: "round", // one of "round", "miter", or "bevel"
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354 minSize: 5 // minimum number of pixels
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355 }
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356 },
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357 name: 'selection',
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358 version: '1.1'
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359 });
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360 })(jQuery);