网页CAD开发引线标注的代码如何写？
以下是一个基本的Web端CAD引线标注绘制代码的示例（使用了d3.js和Snap.svg库）：HTML：<div id="canvas"></div>CSS：#canvas {width: 100%;
height: 100vh;
position: relative;
}
JavaScript：
// 创建SVG画布
var svg = Snap("#canvas");
// 绘制两个点
var point1 = svg.circle(50, 50, 5);
var point2 = svg.circle(150, 150, 5);
// 绘制引线
var line = svg.line(point1.attr("cx"), point1.attr("cy"), point2.attr("cx"), point2.attr("cy")).attr({
stroke: "#000",
strokeWidth: 1,
});
// 绘制箭头
var arrow = svg.polygon([-3, 0, 0, -6, 3, 0]).attr({
fill: "#000",
});
// 计算箭头位置和角度
var dx = point2.attr("cx") - point1.attr("cx");
var dy = point2.attr("cy") - point1.attr("cy");
var angle = Math.atan2(dy, dx) * 180 / Math.PI;
var x = point2.attr("cx") - Math.cos(angle * Math.PI / 180) * 10;
var y = point2.attr("cy") - Math.sin(angle * Math.PI / 180) * 10;
// 将箭头移动并旋转到正确位置
arrow.transform("translate(" + x + "," + y + ") rotate(" + angle + ")");
// 绘制文字
var text = svg.text((point1.attr("cx") + point2.attr("cx")) / 2, (point1.attr("cy") + point2.attr("cy")) / 2, "10").attr({
"text-anchor": "middle",
});
// 计算文字位置
var bbox = text.getBBox();
var textX = bbox.x + bbox.width / 2;
var textY = bbox.y + bbox.height / 2;
// 将文字移动到正确位置
text.attr({ x: textX, y: textY });
// 绘制横线
var line2 = svg.line(textX - 10, textY, textX + 10, textY).attr({
stroke: "#000",
strokeWidth: 1,
});
// 将箭头和文字移到最顶层
arrow.appendTo(svg);
text.appendTo(svg);
// 给点添加拖拽事件
point1.drag(function(dx, dy, x, y) {
this.attr({ cx: parseInt(this.ox) + dx, cy: parseInt(this.oy) + dy });
line.attr({ x1: this.attr("cx"), y1: this.attr("cy") });
updateArrow();
updateText();
updateLine2();
}, function() {
this.ox = this.attr("cx");
this.oy = this.attr("cy");
});
point2.drag(function(dx, dy, x, y) {
this.attr({ cx: parseInt(this.ox) + dx, cy: parseInt(this.oy) + dy });
line.attr({ x2: this.attr("cx"), y2: this.attr("cy") });
updateArrow();
updateText();
updateLine2();
}, function() {
this.ox = this.attr("cx");
this.oy = this.attr("cy");
});
// 更新箭头位置和角度
function updateArrow() {
var dx = point2.attr("cx") - point1.attr("cx");
var dy = point2.attr("cy") - point1.attr("cy");
var angle = Math.atan2(dy, dx) * 180 / Math.PI;
var x = point2.attr("cx") - Math.cos(angle * Math.PI / 180) * 10;
var y = point2.attr("cy") - Math.sin(angle * Math.PI / 180) * 10;
arrow.transform("translate(" + x + "," + y + ") rotate(" + angle + ")");
}
// 更新文字位置
function updateText() {
var bbox = text.getBBox();
var textX = bbox.x + bbox.width / 2;
var textY = bbox.y + bbox.height / 2;
text.attr({ x: textX, y: textY });
}
// 更新横线位置
function updateLine2() {
var bbox = text.getBBox();
var textX = bbox.x + bbox.width / 2;
var textY = bbox.y + bbox.height / 2;
line2.attr({ x1: textX - 10, y1: textY, x2: textX + 10, y2: textY });
}<span style="font-family: 宋体; font-size: 10.5pt; background-color: rgb(255, 255, 255);"> </span>这个示例代码演示了如何绘制一个简单的CAD引线标注，并实现拖拽修改点、自动计算箭头位置和角度、自动调整文字位置和水平线位置等功能。您可以根据需要对代码进行修改和调整。
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