forked from rDrama/rDrama
44 lines
1.2 KiB
JavaScript
44 lines
1.2 KiB
JavaScript
if (innerWidth >= 992)
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{
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/*init*/
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sidebar = document.getElementById('desktop-sidebar')
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if (sidebar) {
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const eye_left = sidebar.getElementsByClassName("eye")[0],
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eye_right = sidebar.getElementsByClassName("eye")[1]
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/*eye movement*/
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document.addEventListener('mousemove', function(event) {
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const click = {x: event.clientX, y: event.clientY},
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/*recalculating eye position on every mousemove is less efficient
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but ensures eyes track properly upon pageload even if script doesnt fire*/
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eye_left_center = getCenter(eye_left),
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eye_right_center = getCenter(eye_right)
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eye_left.style.transform = 'rotate('+getAngle(click, eye_left_center)+'rad)'
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eye_right.style.transform = 'rotate('+getAngle(click, eye_right_center)+'rad)'
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})
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function getCenter(element) {
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const bounds = element.getBoundingClientRect()
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let centerX = bounds["left"] + bounds["width"]/2,
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centerY = bounds["top"] + bounds["height"]/2
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return({x: centerX, y: centerY})
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}
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function getAngle(point1, point2) {
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let x = point1["x"] - point2["x"],
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y = point1["y"] - point2["y"],
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angle = Math.atan(y/x)
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if (point1["x"] < point2["x"]) {
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angle += Math.PI
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}
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return(angle)
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}
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}
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}
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