在线CAD开发中任意线功能如何写代码?
网页CAD绘制任意线的代码如下(使用了Canvas API):HTML部分:<canvas id="myCanvas"></canvas>JavaScript部分:var canvas = document.getElementById("myCanvas");var context = canvas.getContext("2d");
var isDrawing = false;
var startX, startY;
// 监听鼠标按下事件
canvas.addEventListener("mousedown", function(e) {
startX = e.clientX - canvas.offsetLeft;
startY = e.clientY - canvas.offsetTop;
isDrawing = true;
});
// 监听鼠标移动事件
canvas.addEventListener("mousemove", function(e) {
if (!isDrawing) {
return;
}
var x = e.clientX - canvas.offsetLeft;
var y = e.clientY - canvas.offsetTop;
context.beginPath();
context.moveTo(startX, startY);
context.lineTo(x, y);
context.stroke();
startX = x;
startY = y;
});
// 监听鼠标松开事件
canvas.addEventListener("mouseup", function(e) {
isDrawing = false;
});通过监听鼠标的按下、移动和松开事件,在画布上实现了任意线的绘制功能,在线CAD有很多功能,需要更多咨询可以关注梦想CAD控件。
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