调整图形尺寸、旋转图形 | Konva 中文文档中文API

新建一个


    new Konva.Transformer()

的实例

将它添加到 Layer

将节点附加到


    transformer

,


    transformer.nodes([shape]);

通过


    layer.batchDraw()

更新图层

提示: 当你调整尺寸时变形工具没有改变节点的 width 和 height 属性，而是改变了 scaleX 和 scaleY 属性。

说明: 试试调整图形的尺寸和旋转图形。点击空白区域取消选择，按住 SHIFT 或者 CTRL 将图形添加或移除选择。试试用鼠标划一个选区。

Konva Shape transform and selection Demo view raw

<!DOCTYPE html>
<html>
  <head>
    <!-- USE DEVELOPMENT VERSION -->
    <script src="https://unpkg.com/konva@4.0.18/konva.min.js"></script>
    <meta charset="utf-8" />
    <title>Konva Select and Transform 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();
      stage.add(layer);

      var rect1 = new Konva.Rect({
        x: 60,
        y: 60,
        width: 100,
        height: 90,
        fill: 'red',
        name: 'rect',
        draggable: true
      });
      layer.add(rect1);

      var rect2 = new Konva.Rect({
        x: 250,
        y: 100,
        width: 150,
        height: 90,
        fill: 'green',
        name: 'rect',
        draggable: true
      });
      layer.add(rect2);
      layer.draw();

      stage.on('click tap', function(e) {
        // if click on empty area - remove all transformers
        if (e.target === stage) {
          stage.find('Transformer').destroy();
          layer.draw();
          return;
        }
        // do nothing if clicked NOT on our rectangles
        if (!e.target.hasName('rect')) {
          return;
        }
        // remove old transformers
        // TODO: we can skip it if current rect is already selected
        stage.find('Transformer').destroy();

        // create new transformer
        var tr = new Konva.Transformer();
        layer.add(tr);
        tr.attachTo(e.target);
        layer.draw();
      });
    </script>
  </body>
</html>