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const container = Z.by_id('container');
function getRandomColor() {
var letters = '0123456789ABCDEF';
var color = '#';
for (var i = 0; i < 6; i++) {
color += letters[Math.floor(Math.random() * 16)];
}
return color;
}
for (let i = 0; i < 10000; ++i) {
container.appendChild(Z.native('div', {
innerText: i,
className: 'image',
style: {
background: getRandomColor(),
aspectRatio: '1 / ' + (Math.random() + 0.5),
},
}));
}
const zoom = new (class {
constructor() {
this.committed = 5;
this.count = 5;
container.style.gridTemplateColumns = `repeat(5, 1fr)`;
container.classList.toggle('tiling', this.count != 1);
}
update(delta, point) {
this.count += delta;
this.count = Math.min(Math.max(this.count, 1), 20);
const scale = this.committed / this.count;
const rects = Z.document.getClientRects()[0];
const x = point.x;
const y = point.y - rects.y;
container.style.transformOrigin = `${x}px ${y}px`;
container.style.transform = `scale(${scale})`;
}
commit() {
console.log('commit');
this.count = Math.round(this.count);
container.style.transform = 'scale(1)';
container.style.gridTemplateColumns = `repeat(${this.count}, 1fr)`;
container.classList.toggle('tiling', this.count != 1);
this.committed = this.count;
}
});
Z.document.onwheel = (event) => {
if (!event.ctrlKey) {
return;
}
event.preventDefault();
zoom.update(event.wheelDeltaY / 120, { x: 0, y: 0 });
zoom.commit();
};
const pinch = new Pinch(Z.document);
pinch.onpinch = (delta, point) => {
zoom.update(delta / 20, point);
};
pinch.onfinish = (delta) => {
zoom.commit();
};
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