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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: 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>
复制代码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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