forked from chartjs/chartjs-plugin-zoom
-
Notifications
You must be signed in to change notification settings - Fork 0
/
plugin.js
130 lines (110 loc) · 3.69 KB
/
plugin.js
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
import Hammer from 'hammerjs';
import {addListeners, computeDragRect, removeListeners} from './handlers';
import {startHammer, stopHammer} from './hammer';
import {pan, zoom, resetZoom, zoomScale, getZoomLevel, getInitialScaleBounds, isZoomedOrPanned, zoomRect} from './core';
import {panFunctions, zoomFunctions, zoomRectFunctions} from './scale.types';
import {getState, removeState} from './state';
import {version} from '../package.json';
function draw(chart, caller, options) {
const dragOptions = options.zoom.drag;
const {dragStart, dragEnd} = getState(chart);
if (dragOptions.drawTime !== caller || !dragEnd) {
return;
}
const {left, top, width, height} = computeDragRect(chart, options.zoom.mode, dragStart, dragEnd);
const ctx = chart.ctx;
ctx.save();
ctx.beginPath();
ctx.fillStyle = dragOptions.backgroundColor || 'rgba(225,225,225,0.3)';
ctx.fillRect(left, top, width, height);
if (dragOptions.borderWidth > 0) {
ctx.lineWidth = dragOptions.borderWidth;
ctx.strokeStyle = dragOptions.borderColor || 'rgba(225,225,225)';
ctx.strokeRect(left, top, width, height);
}
ctx.restore();
}
export default {
id: 'zoom',
version,
defaults: {
pan: {
enabled: false,
mode: 'xy',
threshold: 10,
modifierKey: null,
},
zoom: {
wheel: {
enabled: false,
speed: 0.1,
modifierKey: null
},
drag: {
enabled: false,
drawTime: 'beforeDatasetsDraw',
modifierKey: null
},
pinch: {
enabled: false
},
mode: 'xy',
}
},
start: function(chart, _args, options) {
const state = getState(chart);
state.options = options;
if (Object.prototype.hasOwnProperty.call(options.zoom, 'enabled')) {
console.warn('The option `zoom.enabled` is no longer supported. Please use `zoom.wheel.enabled`, `zoom.drag.enabled`, or `zoom.pinch.enabled`.');
}
if (Object.prototype.hasOwnProperty.call(options.zoom, 'overScaleMode')
|| Object.prototype.hasOwnProperty.call(options.pan, 'overScaleMode')) {
console.warn('The option `overScaleMode` is deprecated. Please use `scaleMode` instead (and update `mode` as desired).');
}
if (Hammer) {
startHammer(chart, options);
}
chart.pan = (delta, panScales, transition) => pan(chart, delta, panScales, transition);
chart.zoom = (args, transition) => zoom(chart, args, transition);
chart.zoomRect = (p0, p1, transition) => zoomRect(chart, p0, p1, transition);
chart.zoomScale = (id, range, transition) => zoomScale(chart, id, range, transition);
chart.resetZoom = (transition) => resetZoom(chart, transition);
chart.getZoomLevel = () => getZoomLevel(chart);
chart.getInitialScaleBounds = () => getInitialScaleBounds(chart);
chart.isZoomedOrPanned = () => isZoomedOrPanned(chart);
},
beforeEvent(chart) {
const state = getState(chart);
if (state.panning || state.dragging) {
// cancel any event handling while panning or dragging
return false;
}
},
beforeUpdate: function(chart, args, options) {
const state = getState(chart);
state.options = options;
addListeners(chart, options);
},
beforeDatasetsDraw(chart, _args, options) {
draw(chart, 'beforeDatasetsDraw', options);
},
afterDatasetsDraw(chart, _args, options) {
draw(chart, 'afterDatasetsDraw', options);
},
beforeDraw(chart, _args, options) {
draw(chart, 'beforeDraw', options);
},
afterDraw(chart, _args, options) {
draw(chart, 'afterDraw', options);
},
stop: function(chart) {
removeListeners(chart);
if (Hammer) {
stopHammer(chart);
}
removeState(chart);
},
panFunctions,
zoomFunctions,
zoomRectFunctions,
};