-
Notifications
You must be signed in to change notification settings - Fork 0
/
Slider.js
420 lines (354 loc) · 15.5 KB
/
Slider.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
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
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
import {degToRad} from "./Utils.js";
const CIRCLE_IN_RADIANS = (Math.PI * 2); // Circle in radians
const DEFAULT_COLOR = "#FF00FF"; // Default (fallback) slider color
const NUMBER_FORMAT_LOCALES = 'en-US'; // Number format localization
const NUMBER_FORMAT_OPTIONS = {currency: 'USD', maximumFractionDigits: 0, style: 'currency'}; // Number format options
class CircleSlider {
constructor(data = {}) {
// Element selector
if (undefined !== data?.selector) {
// If selector is found then use it, otherwise use body
this.selector = document.querySelector(data.selector) ?? document.getElementsByTagName("body");
} else {
// Use body when selector is not set
this.selector = document.getElementsByTagName("body");
}
this.selector.classList.add("cs-slider");
// List of slides
this.slides = data?.slides ?? [];
// SVG contaner
this.height = 400;
this.width = 400;
// Events
this.is_moving = false; // Is touch/mouse event active
this.moving_index = null; // Which slider is moving
this.almost_reached_max_value = false; // Has slider almost reached the end?
this.almost_reached_min_value = false; // Has slider almost reached the start?
try {
// Run validation on slides properties
this.validateSlides();
// and radius between the slides
this.validateRadius();
// Get max radius, to expand the container sizes
let max_radius = Math.max.apply(Math, this.slides.map(function(o) { return o.radius; })) * 2;
if (max_radius > 370) {
// Expand the container are and add additional 30px margin
this.height = max_radius + 30;
this.width = max_radius + 30;
}
// Creates slides and a legend
this.createLegend();
this.createSlides();
} catch (error) {
this.selector.classList.add("error");
this.selector.innerHTML = error;
}
};
/**
* Calculate angle from current and max value
* @param {number} min Min slide value
* @param {number} max Max slide value
* @param {number} current Current slide value
* @returns {number} Angle in radians
*/
calculateAngle = (min, max, current) => {
// Use min and max value and current value to get fill percentage
// Then multiply percenteg with circle (360deg)
let angle = ((current - min) / (max - min)) * 360;
// Conver angle to radians
return degToRad(angle);
};
/**
* Calculate angle between svg center point and cursor / touch.
* @param {MouseEvent|TouchEvent} event
* @returns {number} Angle in radians
*/
calculateNewAngle = (event) => {
let point = {
x: 0,
y: 0,
};
// Get coordinate where user clicked / touched
if ("mousemove" === event.type) {
point.x = event.clientX;
point.y = event.clientY;
} else if ("touchmove" === event.type) {
point.x = event.touches[0].clientX;
point.y = event.touches[0].clientY;
}
// Get the middle point of a slider
let svg = document.querySelector(".cs-slides svg").getBoundingClientRect();
let middle_point = {
x: svg.left + (svg.width / 2),
y: svg.top + (svg.height / 2),
}
let angle = Math.atan2(point.y - middle_point.y, point.x - middle_point.x);
if (angle < 0) {
// Angle is less than 0, add 360deg
angle += CIRCLE_IN_RADIANS;
}
return angle;
};
/**
* Calculate value from angle
* @param {number} angle Angle in radians
* @param {object} slide Slide details
* @returns {number} Value
*/
calculateValueFromAngle = (angle, slide) => {
if (CIRCLE_IN_RADIANS === angle) {
return slide.max;
}
// Number of steps with used angle
let number_of_steps = Math.round(angle / slide.step_angle);
// Calculate the value
return slide.min + (slide.step * number_of_steps);
};
/**
* Create legend
*/
createLegend = () => {
let list = document.createElement("div");
list.classList.add("cs-legend");
this.slides.forEach((slide, index) => {
if (undefined === slide?.value) {
// Default value not defined, use minimum value
this.slides[index].value = slide.min;
}
if (undefined === slide?.title) {
// Title is not set
this.slides[index].title = "Not set";
}
// Slide wrapper
let list_item = document.createElement("div");
list_item.classList.add("cs-legend-item");
list_item.dataset.index = index;
// Formatted value
let element_value = document.createElement("div");
element_value.classList.add('cs-legend-item--value');
element_value.innerHTML = this.getFormattedValue(slide.value);
// Color box
let element_color = document.createElement("div");
element_color.classList.add('cs-legend-item--color');
element_color.style.backgroundColor = slide?.color ?? DEFAULT_COLOR;
// Title
let element_title = document.createElement("div");
element_title.classList.add('cs-legend-item--title');
element_title.innerHTML = slide.title;
list_item.append(element_value, element_color, element_title);
list.appendChild(list_item);
});
this.selector.appendChild(list);
};
/**
* Create slider(s)
*/
createSlides = () => {
let svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
svg.setAttribute("height", this.height);
svg.setAttribute("width", this.width);
svg.setAttribute("viewBox", `0 0 ${this.width} ${this.height}`);
this.slides.forEach((slide, index) => {
// Calculate angle in radians
let angle = this.calculateAngle(slide.min, slide.max, slide.value);
this.slides[index].angle = angle;
// Calculate step percent
let steps = (slide.max - slide.min) / slide.step; // Number of steps
this.slides[index].step_angle = CIRCLE_IN_RADIANS / steps; // Angle in radians
// Arc or circle to show selected range
let active_range = document.createElementNS("http://www.w3.org/2000/svg", "path");
active_range.setAttribute("d", this.getArcPath(slide.radius, angle, this.width, this.height));
active_range.setAttribute("stroke", `${slide.color}aa`); // Add alpha
active_range.setAttribute("class", "cs-circle");
active_range.setAttribute("data-index", index);
// Circle "dot" element to move the slider value
let dot = document.createElementNS("http://www.w3.org/2000/svg", "circle");
dot.setAttribute("cx", (slide.radius * Math.cos(angle)) + (this.width / 2));
dot.setAttribute("cy", (slide.radius * Math.sin(angle)) + (this.height / 2));
dot.setAttribute("r", 10);
dot.setAttribute("class", "cs-dot");
dot.setAttribute("data-index", index);
// Background circle
let circle = document.createElementNS("http://www.w3.org/2000/svg", "circle");
circle.setAttribute("cx", (this.width / 2));
circle.setAttribute("cy", (this.height / 2));
circle.setAttribute("r", slide.radius);
circle.setAttribute("stroke-dasharray", "8 2");
circle.setAttribute("class", "cs-circle cs-back");
// Create a group
let group = document.createElementNS("http://www.w3.org/2000/svg", "g");
group.dataset.index = index;
// Append group elements
group.appendChild(circle);
group.appendChild(active_range);
group.appendChild(dot);
// Append group
svg.appendChild(group);
});
// Create wrapper and add svg
let svg_wrapper = document.createElement("div");
svg_wrapper.classList.add("cs-slides")
svg_wrapper.appendChild(svg);
this.selector.appendChild(svg_wrapper);
// Add start event for each "dot"
document.querySelectorAll("svg .cs-dot").forEach(item => {
item.addEventListener("mousedown", this.movingStarted);
item.addEventListener("touchstart", this.movingStarted);
});
// Add mouse and touch event to the window
window.addEventListener("mousemove", this.movingRange);
window.addEventListener("touchmove", this.movingRange);
window.addEventListener("mouseup", this.movingEnded);
window.addEventListener("touchend", this.movingEnded);
};
/**
* Get arc or circle path
* @param {number} radius Radius
* @param {number} angle Angle
* @param {number} width Container width
* @param {number} height Container height
* @returns {string} Svg Path
*/
getArcPath = (radius, angle, width, height) => {
if (CIRCLE_IN_RADIANS === angle) {
// Return path for a circle
return `M ${(width / 2)} ${(height / 2)}
m -${radius}, 0
a ${radius},${radius} 0 1,0 ${radius * 2},0
a ${radius},${radius} 0 1,0 -${radius *2},0`;
}
// Is first or second part of an arc
let angle_draw = (Math.PI < angle) ? "1" : "0";
// Return path for a arc
return `M ${(width / 2) + radius} ${height / 2}
A ${radius} ${radius} 0 ${angle_draw} 1 ${(radius * Math.cos(angle)) + (width / 2)} ${(radius * Math.sin(angle)) + (height / 2)}`;
};
/**
* Format value with currency formatting
* @param {number} value Value to be formatted
* @returns {string} Formatted value
*/
getFormattedValue = (value) => {
return new Intl.NumberFormat(NUMBER_FORMAT_LOCALES, NUMBER_FORMAT_OPTIONS).format(value);
};
/**
* Touch or mouse event completed
*/
movingEnded = () => {
// Reset variables
this.is_moving = false;
this.moving_index = null;
this.almost_reached_max_value = false;
this.almost_reached_min_value = false;
};
/**
* Touch or mouse event - moving.
*
* @param {TouchEvent|MouseEvent} event
*/
movingRange = (event) => {
if (true === this.is_moving) {
// Add 90deg, due to svg rotataion
let new_angle = (this.calculateNewAngle(event) + (Math.PI / 2));
if (new_angle > CIRCLE_IN_RADIANS) {
// new angle is more than 360deg
new_angle = new_angle % CIRCLE_IN_RADIANS;
}
if (this.almost_reached_min_value && (new_angle > (Math.PI / 2))) { // 90deg
if (new_angle > ((Math.PI / 2) * 3)) { // 270deg
// User reached the start
this.slides[this.moving_index].angle = 0;
this.slides[this.moving_index].value = this.slides[this.moving_index].min;
new_angle = 0;
}
} else if (this.almost_reached_max_value && (new_angle < ((Math.PI / 2) * 3))) { // 270deg
if (new_angle < (Math.PI / 2)) { // 90deg
// User reached the end
this.slides[this.moving_index].angle = CIRCLE_IN_RADIANS;
this.slides[this.moving_index].value = this.slides[this.moving_index].max;
new_angle = CIRCLE_IN_RADIANS;
}
} else {
this.slides[this.moving_index].angle = new_angle;
}
// Update dot element
let element = document.querySelector(`.cs-dot[data-index="${this.moving_index}"]`);
element.setAttribute("cx", (this.slides[this.moving_index].radius * Math.cos(new_angle)) + (this.width / 2));
element.setAttribute("cy", (this.slides[this.moving_index].radius * Math.sin(new_angle)) + (this.height / 2));
// Update path element
element = document.querySelector(`.cs-circle[data-index="${this.moving_index}"]`);
element.setAttribute("d", this.getArcPath(this.slides[this.moving_index].radius, new_angle, this.width, this.height));
this.slides[this.moving_index].value = this.calculateValueFromAngle(new_angle, this.slides[this.moving_index]);
// this.updateRecords();
this.updateBounds();
document.querySelector(`.cs-legend-item[data-index="${this.moving_index}"] .cs-legend-item--value`).innerHTML = this.getFormattedValue(this.slides[this.moving_index].value);
}
};
/**
* Touch or mouse event started
* @param {TouchEvent|MouseEvent} event
*/
movingStarted = (event) => {
this.is_moving = true;
this.moving_index = event.target.dataset.index;
this.updateBounds();
};
/**
* Update state if user has almost reached the start or end of the slider.
* max is reached when angle is more than 315deg
* min is reached when angle is less than 45deg
*/
updateBounds = () => {
this.almost_reached_max_value = this.slides[this.moving_index].angle > (CIRCLE_IN_RADIANS - (Math.PI / 4));
this.almost_reached_min_value = this.slides[this.moving_index].angle < (Math.PI / 4);
};
/**
* To make a sliders "perfect", radius can't be smaller than 20.
* Radius between each slider must be at least 20.
* @returns {boolean} true when all radiuses are ok
* @throws Exception when radius is too small between the slides
*/
validateRadius = () => {
// List of radiuses
let radiuses = [];
for (let index in this.slides) {
// Add all radiuses to the array
radiuses.push(this.slides[index].radius);
}
// Sort radiuses
radiuses.sort(function (a, b) {
return a - b;
});
// Check if smallest
if (radiuses[0] < 20) {
// Smallest radius can't be less than 20
throw "Radius can not be smaller than 20.";
}
// Difference between each slide must be at least 20.
for (let i = 1; i < radiuses.length; i++) {
if ((radiuses[i] - radiuses[i - 1]) < 20) {
throw "Radius between the slides is less than 20.";
}
}
return true;
};
/**
* Slides Object should have minimum required data for display
* @returns {boolean} true when all slides are valid
* @throws Exception when one slide does not have all required properties
*/
validateSlides = () => {
// Check all objects in a list
for (let index in this.slides) {
let slide = Object.keys(this.slides[index]);
if ((false === slide.includes("max")) ||
(false === slide.includes("min")) ||
(false === slide.includes("radius")) ||
(false === slide.includes("step"))) {
throw "Slide does not have all required properties (max, min, radius, step)<br />" + JSON.stringify(this.slides[index]);
}
};
return true;
};
};
export default CircleSlider;