修改上述代码,实现创建画布和容器,容器透明无边框,容器用来渲染latex数学公式,监听双击、单击画布,双击画布则在鼠标点击位置创建新的容器读取剪贴板内的latex代码渲染成数学公式,按下容器移动鼠标,容器显示边框拖动容器
时间: 2023-07-17 11:04:41 浏览: 102
以下是修改后的代码,实现了创建画布和容器的功能,并且可以根据需求监听双击和单击事件,以及拖动容器的功能。请注意,这段代码需要在支持ES6语法的环境中运行。
```html
<!DOCTYPE html>
<html>
<head>
<title>MathJax Example</title>
<script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script>
<script src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS_HTML"></script>
<style>
#canvas {
position: relative;
width: 100%;
height: 100vh;
background-color: lightgray;
}
.mathjax-formula {
font-size: 2.8em;
background-color: green;
position: absolute;
cursor: move;
padding: 5px;
border-radius: 5px;
color: white;
}
.mathjax-formula:focus {
outline: none;
border: 2px solid black;
}
</style>
</head>
<body>
<div id="canvas">
<div id="mathjax-formulas-container"></div>
</div>
<script>
var formulas = [];
var selectedFormula = null;
var isDragging = false;
function createFormula(latexCode, x, y) {
var mathjaxFormulasContainer = document.getElementById("mathjax-formulas-container");
var newFormula = document.createElement("div");
newFormula.className = "mathjax-formula";
newFormula.style.left = x + "px";
newFormula.style.top = y + "px";
newFormula.contentEditable = true;
newFormula.innerText = latexCode;
mathjaxFormulasContainer.appendChild(newFormula);
formulas.push({
latexCode: latexCode,
position: {
x: x,
y: y
}
});
MathJax.Hub.Queue(["Typeset", MathJax.Hub, newFormula]);
newFormula.addEventListener("dblclick", function(event) {
event.stopPropagation();
});
newFormula.addEventListener("mousedown", function(event) {
event.stopPropagation();
selectedFormula = newFormula;
isDragging = true;
newFormula.style.cursor = "move";
});
newFormula.addEventListener("mouseup", function(event) {
event.stopPropagation();
isDragging = false;
newFormula.style.cursor = "auto";
});
newFormula.addEventListener("mousemove", function(event) {
event.stopPropagation();
if (isDragging && selectedFormula === newFormula) {
var newX = event.clientX - selectedFormula.offsetWidth / 2;
var newY = event.clientY - selectedFormula.offsetHeight / 2;
selectedFormula.style.left = newX + "px";
selectedFormula.style.top = newY + "px";
}
});
newFormula.addEventListener("keydown", function(event) {
if (event.key === "Enter") {
event.preventDefault();
newFormula.blur();
MathJax.Hub.Queue(["Typeset", MathJax.Hub, newFormula]);
}
});
}
document.getElementById("canvas").addEventListener("dblclick", function(event) {
navigator.clipboard.readText().then(function(text) {
if (text) {
var latexCode = text.trim();
if (latexCode) {
createFormula(latexCode, event.clientX, event.clientY);
}
}
});
});
document.getElementById("canvas").addEventListener("click", function(event) {
if (event.target === document.getElementById("canvas")) {
if (selectedFormula) {
selectedFormula.style.border = "none";
selectedFormula = null;
isDragging = false;
}
}
});
</script>
</body>
</html>
```
这段代码将创建一个画布,可以在画布上双击创建新的容器,并从剪贴板中读取LaTeX代码进行渲染。单击画布以外的区域会取消选中容器。选中容器后,可以通过按住鼠标左键拖动容器来移动位置。在容器内按下回车键将重新渲染数学公式。
请注意,这段代码仅实现了基本的功能,可能需要进一步优化和完善以适应具体需求。
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