要使用Konva拖放线，我们在实例化线时可以设置draggable属性，设置对象的值为true，或者我们可以使用draggable（）方法。

Konva Drag and Drop the Line Demo 点击查看

<!DOCTYPE html>
<html>
<head>
<script src="https://cdn.rawgit.com/konvajs/konva/1.4.0/konva.min.js"></script>
<meta charset="utf-8">
<title>Konva Drag and Drop a Line Demo</title>
<style>
    body {
        margin: 0;
        padding: 0;
        overflow: hidden;
        background-color: #F0F0F0;
    }
</style>
</head>
<body>
<div id="container"></div>
<script>
var width = window.innerWidth;
var height = window.innerHeight;
var stage = new Konva.Stage({
    container: 'container',
    width: width,
    height: height
});
var layer = new Konva.Layer();
// complex dashed and dotted line
var blueLine = new Konva.Line({
    y: 50,
    points: [10, 70, 40, 23, 150, 60, 250, 20],
    stroke: 'blue',
    strokeWidth: 10,
    lineCap: 'round',
    lineJoin: 'round',
    /*
    * line segments with a length of 29px with a gap
    * of 20px followed by a line segment of 0.001px (a dot)
    * followed by a gap of 20px
    */
    dash: [29, 20, 0.001, 20],
    draggable: true
});
layer.add(blueLine);
stage.add(layer);
</script>
</body>
</html>

拖放-线

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