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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>CssMatrix</title>
<style>
* {
box-sizing: border-box;
}
body {
margin: 0;
overflow: hidden;
}
.wrapper {
display: flex;
width: 100vw;
height: 100vh;
justify-content: center;
align-items: center;
}
.mask-box {
position: absolute;
inset: 0;
display: flex;
justify-content: center;
align-items: center;
z-index: 100;
}
.mask {
display: inline-flex;
box-sizing: border-box;
transform-origin: left top;
border: 4px dashed red;
}
.mask img {
opacity: 0;
}
</style>
</head>
<body>
<div class="wrapper">
<div style="transform-origin: left top;" id="transform-box">
<img src="img.png" alt="" id="transform-img">
</div>
</div>
<!--init img border-->
<div class="mask-box" style="pointer-events: none;">
<div class="mask">
<img src="img.png" alt="">
</div>
</div>
<script type="module">
import {CssMatrix} from './dist/index.js';
const boxEl = document.getElementById('transform-box');
const imgEl = document.getElementById('transform-img');
const maskEl = document.querySelector('.mask');
const matrix = new CssMatrix();
const moveSensitivity = 1;
const scaleSensitivity = 0.05;
const onMouseMove = ev => {
const mx = ev.movementX * moveSensitivity;
const my = ev.movementY * moveSensitivity;
matrix.move(mx, my);
boxEl.style.transform = matrix.toString();
}
const onMouseUp = () => {
document.removeEventListener('mousemove', onMouseMove, true);
document.removeEventListener('mouseup', onMouseUp, true);
}
boxEl.addEventListener('mousedown', () => {
document.addEventListener('mousemove', onMouseMove, true);
document.addEventListener('mouseup', onMouseUp, true);
});
boxEl.addEventListener('wheel', ev => {
const delta = ev.deltaY > 0 ? 1 : -1;
const scale = 1 - delta * scaleSensitivity;
const rect = maskEl.getBoundingClientRect();
const x = ev.clientX - rect.left;
const y = ev.clientY - rect.top;
console.log(x, y);
matrix.scaleAtPoint(scale, x, y);
boxEl.style.transform = matrix.toString();
})
imgEl.addEventListener("mousedown", ev => {
ev.preventDefault();
})
</script>
</body>
</html>