Merge branch 'master' of https://github.com/kberg/dygraphs
[dygraphs.git] / tests / interaction.js
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1// Code for a variety of interaction models. Used in interaction.html, but split out from
2// that file so they can be tested in isolation.
3//
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4function downV3(event, g, context) {
5 context.initializeMouseDown(event, g, context);
6 if (event.altKey || event.shiftKey) {
7 Dygraph.startZoom(event, g, context);
8 } else {
9 Dygraph.startPan(event, g, context);
10 }
11}
12
13function moveV3(event, g, context) {
14 if (context.isPanning) {
15 Dygraph.movePan(event, g, context);
16 } else if (context.isZooming) {
17 Dygraph.moveZoom(event, g, context);
18 }
19}
20
21function upV3(event, g, context) {
22 if (context.isPanning) {
23 Dygraph.endPan(event, g, context);
24 } else if (context.isZooming) {
25 Dygraph.endZoom(event, g, context);
26 }
27}
28
29// Take the offset of a mouse event on the dygraph canvas and
30// convert it to a pair of percentages from the bottom left.
31// (Not top left, bottom is where the lower value is.)
32function offsetToPercentage(g, offsetX, offsetY) {
33 // This is calculating the pixel offset of the leftmost date.
34 var xOffset = g.toDomCoords(g.xAxisRange()[0], null)[0];
35 var yar0 = g.yAxisRange(0);
36
37 // This is calculating the pixel of the higest value. (Top pixel)
38 var yOffset = g.toDomCoords(null, yar0[1])[1];
39
40 // x y w and h are relative to the corner of the drawing area,
41 // so that the upper corner of the drawing area is (0, 0).
42 var x = offsetX - xOffset;
43 var y = offsetY - yOffset;
44
45 // This is computing the rightmost pixel, effectively defining the
46 // width.
47 var w = g.toDomCoords(g.xAxisRange()[1], null)[0] - xOffset;
48
49 // This is computing the lowest pixel, effectively defining the height.
50 var h = g.toDomCoords(null, yar0[0])[1] - yOffset;
51
52 // Percentage from the left.
53 var xPct = w == 0 ? 0 : (x / w);
54 // Percentage from the top.
55 var yPct = h == 0 ? 0 : (y / h);
56
57 // The (1-) part below changes it from "% distance down from the top"
58 // to "% distance up from the bottom".
59 return [xPct, (1-yPct)];
60}
61
62function dblClickV3(event, g, context) {
63 // Reducing by 20% makes it 80% the original size, which means
64 // to restore to original size it must grow by 25%
65 var percentages = offsetToPercentage(g, event.offsetX, event.offsetY);
66 var xPct = percentages[0];
67 var yPct = percentages[1];
68
69 if (event.ctrlKey) {
70 zoom(g, -.25, xPct, yPct);
71 } else {
72 zoom(g, +.2, xPct, yPct);
73 }
74}
75
9d10bca3 76var lastClickedGraph = null;
fd556f34 77
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78function clickV3(event, g, context) {
79 lastClickedGraph = g;
80 Dygraph.cancelEvent(event);
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81}
82
2c1befcb 83function scrollV3(event, g, context) {
9d10bca3 84 if (lastClickedGraph != g) {
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85 return;
86 }
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87 var normal = event.detail ? event.detail * -1 : event.wheelDelta / 40;
88 // For me the normalized value shows 0.075 for one click. If I took
89 // that verbatim, it would be a 7.5%.
90 var percentage = normal / 50;
91
92 var percentages = offsetToPercentage(g, event.offsetX, event.offsetY);
93 var xPct = percentages[0];
94 var yPct = percentages[1];
95
96 zoom(g, percentage, xPct, yPct);
97 Dygraph.cancelEvent(event);
98}
99
100// Adjusts [x, y] toward each other by zoomInPercentage%
101// Split it so the left/bottom axis gets xBias/yBias of that change and
102// tight/top gets (1-xBias)/(1-yBias) of that change.
103//
104// If a bias is missing it splits it down the middle.
105function zoom(g, zoomInPercentage, xBias, yBias) {
106 xBias = xBias || 0.5;
107 yBias = yBias || 0.5;
108 function adjustAxis(axis, zoomInPercentage, bias) {
109 var delta = axis[1] - axis[0];
110 var increment = delta * zoomInPercentage;
111 var foo = [increment * bias, increment * (1-bias)];
112 return [ axis[0] + foo[0], axis[1] - foo[1] ];
113 }
114 var yAxes = g.yAxisRanges();
115 var newYAxes = [];
116 for (var i = 0; i < yAxes.length; i++) {
117 newYAxes[i] = adjustAxis(yAxes[i], zoomInPercentage, yBias);
118 }
119
120 g.updateOptions({
121 dateWindow: adjustAxis(g.xAxisRange(), zoomInPercentage, xBias),
122 valueRange: newYAxes[0]
123 });
124}
125
126var v4Active = false;
127var v4Canvas = null;
128
129function downV4(event, g, context) {
130 context.initializeMouseDown(event, g, context);
131 v4Active = true;
132 moveV4(event, g, context); // in case the mouse went down on a data point.
133}
134
135var processed = [];
136
137function moveV4(event, g, context) {
138 var RANGE = 7;
139
140 if (v4Active) {
141 var canvasx = Dygraph.pageX(event) - Dygraph.findPosX(g.graphDiv);
142 var canvasy = Dygraph.pageY(event) - Dygraph.findPosY(g.graphDiv);
143
144 var rows = g.numRows();
145 // Row layout:
146 // [date, [val1, stdev1], [val2, stdev2]]
147 for (var row = 0; row < rows; row++) {
148 var date = g.getValue(row, 0);
149 var x = g.toDomCoords(date, null)[0];
150 var diff = Math.abs(canvasx - x);
151 if (diff < RANGE) {
152 for (var col = 1; col < 3; col++) {
153 // TODO(konigsberg): these will throw exceptions as data is removed.
154 var vals = g.getValue(row, col);
155 if (vals == null) { continue; }
156 var val = vals[0];
157 var y = g.toDomCoords(null, val)[1];
158 var diff2 = Math.abs(canvasy - y);
159 if (diff2 < RANGE) {
160 var found = false;
161 for (var i in processed) {
162 var stored = processed[i];
163 if(stored[0] == row && stored[1] == col) {
164 found = true;
165 break;
9e9ca2eb 166 }
9e9ca2eb 167 }
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168 if (!found) {
169 processed.push([row, col]);
170 drawV4(x, y);
171 }
172 return;
9e9ca2eb 173 }
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174 }
175 }
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176 }
177 }
178}
179
180function upV4(event, g, context) {
181 if (v4Active) {
182 v4Active = false;
183 }
184}
185
186function dblClickV4(event, g, context) {
187 restorePositioning(g4);
188}
189
190function drawV4(x, y) {
191 var ctx = v4Canvas;
192
193 ctx.strokeStyle = "#000000";
194 ctx.fillStyle = "#FFFF00";
195 ctx.beginPath();
196 ctx.arc(x,y,5,0,Math.PI*2,true);
197 ctx.closePath();
198 ctx.stroke();
199 ctx.fill();
200}
201
202function captureCanvas(canvas, area, g) {
203 v4Canvas = canvas;
204}
205
206function restorePositioning(g) {
207 g.updateOptions({
208 dateWindow: null,
209 valueRange: null
210 });
211}