https://sasini.co.ke/wp-content/themes/sasini2023/assets/js/vanilla-tilt.js?ver=2.1.2

1var VanillaTilt = (function () {
2'use strict';
3
4/**
5 * Created by Sergiu Șandor (micku7zu) on 1/27/2017.
6 * Original idea: https://github.com/gijsroge/tilt.js
7 * MIT License.
8 * Version 1.8.0
9 */
10
11class VanillaTilt {
12  constructor(element, settings = {}) {
13    if (!(element instanceof Node)) {
14      throw ("Can't initialize VanillaTilt because " + element + " is not a Node.");
15    }
16
17    this.width = null;
18    this.height = null;
19    this.clientWidth = null;
20    this.clientHeight = null;
21    this.left = null;
22    this.top = null;
23
24    // for Gyroscope sampling
25    this.gammazero = null;
26    this.betazero = null;
27    this.lastgammazero = null;
28    this.lastbetazero = null;
29
30    this.transitionTimeout = null;
31    this.updateCall = null;
32    this.event = null;
33
34    this.updateBind = this.update.bind(this);
35    this.resetBind = this.reset.bind(this);
36
37    this.element = element;
38    this.settings = this.extendSettings(settings);
39
40    this.reverse = this.settings.reverse ? -1 : 1;
41    this.resetToStart = VanillaTilt.isSettingTrue(this.settings["reset-to-start"]);
42    this.glare = VanillaTilt.isSettingTrue(this.settings.glare);
43    this.glarePrerender = VanillaTilt.isSettingTrue(this.settings["glare-prerender"]);
44    this.fullPageListening = VanillaTilt.isSettingTrue(this.settings["full-page-listening"]);
45    this.gyroscope = VanillaTilt.isSettingTrue(this.settings.gyroscope);
46    this.gyroscopeSamples = this.settings.gyroscopeSamples;
47
48    this.elementListener = this.getElementListener();
49
50    if (this.glare) {
51      this.prepareGlare();
52    }
53
54    if (this.fullPageListening) {
55      this.updateClientSize();
56    }
57
58    this.addEventListeners();
59    this.reset();
60
61    if (this.resetToStart === false) {
62      this.settings.startX = 0;
63      this.settings.startY = 0;
64    }
65  }
66
67  static isSettingTrue(setting) {
68    return setting === "" || setting === true || setting === 1;
69  }
70
71  /**
72   * Method returns element what will be listen mouse events
73   * @return {Node}
74   */
75  getElementListener() {
76    if (this.fullPageListening) {
77      return window.document;
78    }
79
80    if (typeof this.settings["mouse-event-element"] === "string") {
81      const mouseEventElement = document.querySelector(this.settings["mouse-event-element"]);
82
83      if (mouseEventElement) {
84        return mouseEventElement;
85      }
86    }
87
88    if (this.settings["mouse-event-element"] instanceof Node) {
89      return this.settings["mouse-event-element"];
90    }
91
92    return this.element;
93  }
94
95  /**
96   * Method set listen methods for this.elementListener
97   * @return {Node}
98   */
99  addEventListeners() {
100    this.onMouseEnterBind = this.onMouseEnter.bind(this);
101    this.onMouseMoveBind = this.onMouseMove.bind(this);
102    this.onMouseLeaveBind = this.onMouseLeave.bind(this);
103    this.onWindowResizeBind = this.onWindowResize.bind(this);
104    this.onDeviceOrientationBind = this.onDeviceOrientation.bind(this);
105
106    this.elementListener.addEventListener("mouseenter", this.onMouseEnterBind);
107    this.elementListener.addEventListener("mouseleave", this.onMouseLeaveBind);
108    this.elementListener.addEventListener("mousemove", this.onMouseMoveBind);
109
110    if (this.glare || this.fullPageListening) {
111      window.addEventListener("resize", this.onWindowResizeBind);
112    }
113
114    if (this.gyroscope) {
115      window.addEventListener("deviceorientation", this.onDeviceOrientationBind);
116    }
117  }
118
119  /**
120   * Method remove event listeners from current this.elementListener
121   */
122  removeEventListeners() {
123    this.elementListener.removeEventListener("mouseenter", this.onMouseEnterBind);
124    this.elementListener.removeEventListener("mouseleave", this.onMouseLeaveBind);
125    this.elementListener.removeEventListener("mousemove", this.onMouseMoveBind);
126
127    if (this.gyroscope) {
128      window.removeEventListener("deviceorientation", this.onDeviceOrientationBind);
129    }
130
131    if (this.glare || this.fullPageListening) {
132      window.removeEventListener("resize", this.onWindowResizeBind);
133    }
134  }
135
136  destroy() {
137    clearTimeout(this.transitionTimeout);
138    if (this.updateCall !== null) {
139      cancelAnimationFrame(this.updateCall);
140    }
141
142    this.reset

142();
143
144    this.removeEventListeners();
145    this.element.vanillaTilt = null;
146    delete this.element.vanillaTilt;
147
148    this.element = null;
149  }
150
151  onDeviceOrientation(event) {
152    if (event.gamma === null || event.beta === null) {
153      return;
154    }
155
156    this.updateElementPosition();
157
158    if (this.gyroscopeSamples > 0) {
159      this.lastgammazero = this.gammazero;
160      this.lastbetazero = this.betazero;
161
162      if (this.gammazero === null) {
163        this.gammazero = event.gamma;
164        this.betazero = event.beta;
165      } else {
166        this.gammazero = (event.gamma + this.lastgammazero) / 2;
167        this.betazero = (event.beta + this.lastbetazero) / 2;
168      }
169
170      this.gyroscopeSamples -= 1;
171    }
172
173    const totalAngleX = this.settings.gyroscopeMaxAngleX - this.settings.gyroscopeMinAngleX;
174    const totalAngleY = this.settings.gyroscopeMaxAngleY - this.settings.gyroscopeMinAngleY;
175
176    const degreesPerPixelX = totalAngleX / this.width;
177    const degreesPerPixelY = totalAngleY / this.height;
178
179    const angleX = event.gamma - (this.settings.gyroscopeMinAngleX + this.gammazero);
180    const angleY = event.beta - (this.settings.gyroscopeMinAngleY + this.betazero);
181
182    const posX = angleX / degreesPerPixelX;
183    const posY = angleY / degreesPerPixelY;
184
185    if (this.updateCall !== null) {
186      cancelAnimationFrame(this.updateCall);
187    }
188
189    this.event = {
190      clientX: posX + this.left,
191      clientY: posY + this.top,
192    };
193
194    this.updateCall = requestAnimationFrame(this.updateBind);
195  }
196
197  onMouseEnter() {
198    this.updateElementPosition();
199    this.element.style.willChange = "transform";
200    this.setTransition();
201  }
202
203  onMouseMove(event) {
204    if (this.updateCall !== null) {
205      cancelAnimationFrame(this.updateCall);
206    }
207
208    this.event = event;
209    this.updateCall = requestAnimationFrame(this.updateBind);
210  }
211
212  onMouseLeave() {
213    this.setTransition();
214
215    if (this.settings.reset) {
216      requestAnimationFrame(this.resetBind);
217    }
218  }
219
220  reset() {
221    this.onMouseEnter();
222
223    if (this.fullPageListening) {
224      this.event = {
225        clientX: (this.settings.startX + this.settings.max) / (2 * this.settings.max) * this.clientWidth,
226        clientY: (this.settings.startY + this.settings.max) / (2 * this.settings.max) * this.clientHeight
227      };
228    } else {
229      this.event = {
230        clientX: this.left + ((this.settings.startX + this.settings.max) / (2 * this.settings.max) * this.width),
231        clientY: this.top + ((this.settings.startY + this.settings.max) / (2 * this.settings.max) * this.height)
232      };
233    }
234
235    let backupScale = this.settings.scale;
236    this.settings.scale = 1;
237    this.update();
238    this.settings.scale = backupScale;
239    this.resetGlare();
240  }
241
242  resetGlare() {
243    if (this.glare) {
244      this.glareElement.style.transform = "rotate(180deg) translate(-50%, -50%)";
245      this.glareElement.style.opacity = "0";
246    }
247  }
248
249  getValues() {
250    let x, y;
251
252    if (this.fullPageListening) {
253      x = this.event.clientX / this.clientWidth;
254      y = this.event.clientY / this.clientHeight;
255    } else {
256      x = (this.event.clientX - this.left) / this.width;
257      y = (this.event.clientY - this.top) / this.height;
258    }
259
260    x = Math.min(Math.max(x, 0), 1);
261    y = Math.min(Math.max(y, 0), 1);
262
263    let tiltX = (this.reverse * (this.settings.max - x * this.settings.max * 2)).toFixed(2);
264    let tiltY = (this.reverse * (y * this.settings.max * 2 - this.settings.max)).toFixed(2);
265    let angle = Math.atan2(this.event.clientX - (this.left + this.width / 2), -(this.event.clientY - (this.top + this.height / 2))) * (180 / Math.PI);
266
267    return {
268      tiltX: tiltX,
269      tiltY: tiltY,
270      percentageX: x * 100,
271      percentageY: y * 100,
272      angle: angle
273    };
274  }
275
276  updateElementPosition() {
277    let rect = this.element.getBoundingClientRect();
278
279    this.width = this.element.offsetWidth;
280    this.height = this.element.offsetHeight;
281    this.left = rect.left;
282    this.top = rect.top;
283  }
284
285  update() {
286    let values = this.getValues();
287
288    this.element.style.transform = "perspective(" + this.settings.perspective + "px) " +
289      "rotateX(" + (this.settings.axis === "x" ? 0 : values.tiltY) + "deg) " +
290      "rotateY(" + (this.settings.axis === "y" ? 0 : values.tiltX) + "deg) " +
291      "scale3d(" + this.settings.scale + ", " + this.settings.scale + ", " + this.settings.scale + ")";
292
293    if (this.glare) {
294      this.glareElement.style.transform = `rotate(${values.angle}deg) translate(-50%, -50%)`;
295      this.glareElement.style.opacity = `${values.percentageY * this.settings["max-glare"] / 100}`;
296    }
297
298    this.element.dispatchEvent(new CustomEvent("tiltChange", {
299      "detail": values
300    }));
301
302    this.updateCall = null;
303  }
304
305  /**
306   * Appends the glare element (if glarePrerender equals false)
307   * and sets the default style
308   */
309  prepareGlare() {
310    // If option pre-render is enabled we assume all html/css is present for an optimal glare effect.
311    if (!this.glarePrerender) {
312      // Create glare element
313      const jsTiltGlare = document.createElement("div");
314      jsTiltGlare.classList.add("js-tilt-glare");
315
316      const jsTiltGlareInner = document.createElement("div");
317      jsTiltGlareInner.classList.add("js-tilt-glare-inner");
318
319      jsTiltGlare.appendChild(jsTiltGlareInner);
320      this.element.appendChild(jsTiltGlare);
321    }
322
323    this.glareElementWrapper = this.element.querySelector(".js-tilt-glare");
324    this.glareElement = this.element.querySelector(".js-tilt-glare-inner");
325
326    if (this.glarePrerender) {
327      return;
328    }
329
330    Object.assign(this.glareElementWrapper.style, {
331      "position": "absolute",
332      "top": "0",
333      "left": "0",
334      "width": "100%",
335      "height": "100%",
336      "overflow": "hidden",
337      "pointer-events": "none",
338      "border-radius": "inherit"
339    });
340
341    Object.assign(this.glareElement.style, {
342      "position": "absolute",
343      "top": "50%",
344      "left": "50%",
345      "pointer-events": "none",
346      "background-image": `linear-gradient(0deg, rgba(255,255,255,0) 0%, rgba(255,255,255,1) 100%)`,
347      "transform": "rotate(180deg) translate(-50%, -50%)",
348      "transform-origin": "0% 0%",
349      "opacity": "0"
350    });
351
352    this.updateGlareSize();
353  }
354
355  updateGlareSize() {
356    if (this.glare) {
357      const glareSize = (this.element.offsetWidth > this.element.offsetHeight ? this.element.offsetWidth : this.element.offsetHeight) * 2;
358
359      Object.assign(this.glareElement.style, {
360        "width": `${glareSize}px`,
361        "height": `${glareSize}px`,
362      });
363    }
364  }
365
366  updateClientSize() {
367    this.clientWidth = window.innerWidth
368      || document.documentElement.clientWidth
369      || document.body.clientWidth;
370
371    this.clientHeight = window.innerHeight
372      || document.documentElement.clientHeight
373      || document.body.clientHeight;
374  }
375
376  onWindowResize() {
377    this.updateGlareSize();
378    this.updateClientSize();
379  }
380
381  setTransition() {
382    clearTimeout(this.transitionTimeout);
383    this.element.style.transition = this.settings.speed + "ms " + this.settings.easing;
384    if (this.glare) this.glareElement.style.transition = `opacity ${this.settings.speed}ms ${this.settings.easing}`;
385
386    this.transitionTimeout = setTimeout(() => {
387      this.element.style.transition = "";
388      if (this.glare) {
389        this.glareElement.style.transition = "";
390      }
391    }, this.settings.speed);
392
393  }
394
395  /**
396   * Method return patched settings of instance
397   * @param {boolean} settings.reverse - reverse the tilt direction
398   * @param {number} settings.max - max tilt rotation (degrees)
399   * @param {startX} settings.startX - the starting tilt on the X axis, in degrees. Default: 0
400   * @param {startY} settings.startY - the starting tilt on the Y axis, in degrees. Default: 0
401   * @param {number} settings.perspective - Transform perspective, the lower the more extreme the tilt gets
402   * @param {string} settings.easing - Easing on enter/exit
403   * @param {number} settings.scale - 2 = 200%, 1.5 = 150%, etc..
404   * @param {number} settings.speed - Speed of the enter/exit transition
405   * @param {boolean} settings.transition - Set a transition on enter/exit
406   * @param {string|null} settings.axis - What axis should be enabled. Can be "x" or "y"
407   * @param {boolean} settings.glare - if it should have a "glare" effect
408   * @param {number} settings.max-glare - the maximum "glare" opacity (1 = 100%, 0.5 = 50%)
409   * @param {boolean} settings.glare-prerender - false = VanillaTilt creates the glare elements for you, otherwise
410   * @param {boolean} settings.full-page-listening - If true, parallax effect will listen to mouse move events on the whole document, not only the selected element
411   * @param {string|object} settings.mouse-event-element - String selector or link to HTML-element what will be listen mouse events
412   * @param {boolean} settings.reset - false = If the tilt effect has to be reset on exit
413   * @param {boolean} settings.reset-to-start - true = On reset event (mouse leave) will return to initial start angle (if startX or startY is set)
414   * @param {gyroscope} settings.gyroscope - Enable tilting by deviceorientation events
415   * @param {gyroscopeSensitivity} settings.gyroscopeSensitivity - Between 0 and 1 - The angle at which max tilt position is reached. 1 = 90deg, 0.5 = 45deg, etc..
416   * @param {gyroscopeSamples} settings.gyroscopeSamples - How many gyroscope moves to decide the starting position.
417   */
418  extendSettings(settings) {
419    let defaultSettings = {
420      reverse: false,
421      max: 15,
422      startX: 0,
423      startY: 0,
424      perspective: 1000,
425      easing: "cubic-bezier(.03,.98,.52,.99)",
426      scale: 1,
427      speed: 300,
428      transition: true,
429      axis: null,
430      glare: false,
431      "max-glare": 1,
432      "glare-prerender": false,
433      "full-page-listening": false,
434      "mouse-event-element": null,
435      reset: true,
436      "reset-to-start": true,
437      gyroscope: true,
438      gyroscopeMinAngleX: -45,
439      gyroscopeMaxAngleX: 45,
440      gyroscopeMinAngleY: -45,
441      gyroscopeMaxAngleY: 45,
442      gyroscopeSamples: 10
443    };
444
445    let newSettings = {};
446    for (var property in defaultSettings) {
447      if (property in settings) {
448        newSettings[property] = settings[property];
449      } else if (this.element.hasAttribute("data-tilt-" + property)) {
450        let attribute = this.element.getAttribute("data-tilt-" + property);
451        try {
452          newSettings[property] = JSON.parse(attribute);
453        } catch (e) {
454          newSettings[property] = attribute;
455        }
456
457      } else {
458        newSettings[property] = defaultSettings[property];
459      }
460    }
461
462    return newSettings;
463  }
464
465  static init(elements, settings) {
466    if (elements instanceof Node) {
467      elements = [elements];
468    }
469
470    if (elements instanceof NodeList) {
471      elements = [].slice.call(elements);
472    }
473
474    if (!(elements instanceof Array)) {
475      return;
476    }
477
478    elements.forEach((element) => {
479      if (!("vanillaTilt" in element)) {
480        element.vanillaTilt = new VanillaTilt(element, settings);
481      }
482    });
483  }
484}
485
486if (typeof document !== "undefined") {
487  /* expose the class to window */
488  window.VanillaTilt = VanillaTilt;
489
490  /**
491   * Auto load
492   */
493  VanillaTilt.init(document.querySelectorAll("[data-tilt]"));
494}