90 lines
2.6 KiB
JavaScript

const stepSize = 100;
const main = document.querySelector('main');
const draggables = document.querySelectorAll(".draggable");
const randomStarts = document.querySelectorAll(".randomStart");
var zIndex = 2;
activateDraggables();
/**
*
* @param {number} n
* @returns {number}
*/
function stepedSize(n) {
return stepSize * Math.round(n / stepSize);
}
function move(e) {
e.preventDefault();
let target = e.target;
target.style['z-index'] = zIndex;
zIndex++;
target.moving = true;
target.setAttribute('data-moving', '1');
if (e.clientX) {
target.oldX = e.clientX; // If they exist then use Mouse input
target.oldY = e.clientY;
} else {
target.oldX = e.touches[0].clientX; // Otherwise use touch input
target.oldY = e.touches[0].clientY;
}
target.oldLeft = window.getComputedStyle(target).getPropertyValue('left').split('px')[0] * 1;
target.oldTop = window.getComputedStyle(target).getPropertyValue('top').split('px')[0] * 1;
document.addEventListener('mousemove', drag);
document.addEventListener('touchmove', drag, {passive: true});
function drag(event) {
event.preventDefault();
if (!target.moving) {
return;
}
if (event.clientX) {
target.distX = event.clientX - target.oldX;
target.distY = event.clientY - target.oldY;
} else {
target.distX = event.touches[0].clientX - target.oldX;
target.distY = event.touches[0].clientY - target.oldY;
}
newLeft = target.oldLeft + target.distX;
newTop = target.oldTop + target.distY;
target.style.left = stepedSize(newLeft) + "px";
target.style.top = stepedSize(newTop) + "px";
}
function endDrag() {
target.moving = false;
target.setAttribute('data-moving', '0');
}
document.addEventListener('mouseup', endDrag)
document.addEventListener('touchend', endDrag)
}
function activateDraggables() {
for (var draggable of draggables) {
draggable.addEventListener('mousedown', move);
draggable.addEventListener('touchstart', move, {passive: true});
}
}
function randomizeDragables() {
maxX = main.offsetWidth - 150;
maxY = main.offsetHeight - 150;
for (var randomStart of randomStarts) {
randX = Math.floor(Math.random() * maxX);
randY = Math.floor(Math.random() * maxY);
randomStart.style.left = randX + "px";
randomStart.style.top = randY + "px";
}
}
document.addEventListener("DOMContentLoaded", randomizeDragables);