<div id="diagram"></div>
<script>
  var Shape = kendo.dataviz.diagram.Shape;
  $("#diagram").kendoDiagram();
  var diagram = $("#diagram").data("kendoDiagram");

  var shape = new Shape({
    id: 1,
    x: 40,
    y: 40,
    fill: "#c0f0fc",
    rotation: {
      angle: 45
    }
  });
  diagram.addShape(shape);
</script>

<div id="diagram"></div>
<script>
$("#diagram").kendoDiagram({
    shapes: [{
        id: "1",
        content: {
            text: "Rotated Shape"
        },
        rotation: {
            angle: 45
        }
    }]
});
</script>