konva/test/unit/Animation-test.js

suite('Animation', function () {
  // ======================================================
  test('test start and stop', function () {
    var stage = addStage();
    var layer = new Konva.Layer();
    var rect = new Konva.Rect({
      x: 200,
      y: 100,
      width: 100,
      height: 50,
      fill: 'green',
      stroke: 'black',
      strokeWidth: 4,
    });

    layer.add(rect);
    stage.add(layer);

    var amplitude = 150;
    var period = 1000;
    // in ms
    var centerX = stage.getWidth() / 2 - 100 / 2;

    var anim = new Konva.Animation(function (frame) {
      rect.setX(
        amplitude * Math.sin((frame.time * 2 * Math.PI) / period) + centerX
      );
    }, layer);
    var a = Konva.Animation.animations;
    var startLen = a.length;

    assert.equal(a.length, startLen, '1should be no animations running');

    anim.start();
    assert.equal(a.length, startLen + 1, '2should be 1 animation running');

    anim.stop();
    assert.equal(a.length, startLen, '3should be no animations running');

    anim.start();
    assert.equal(a.length, startLen + 1, '4should be 1 animation running');

    anim.start();
    assert.equal(a.length, startLen + 1, '5should be 1 animation runningg');

    anim.stop();
    assert.equal(a.length, startLen, '6should be no animations running');

    anim.stop();
    assert.equal(a.length, startLen, '7should be no animations running');
  });

  // ======================================================
  test('layer batch draw', function () {
    var stage = addStage();
    var layer = new Konva.Layer();
    var rect = new Konva.Rect({
      x: 200,
      y: 100,
      width: 100,
      height: 50,
      fill: 'green',
      stroke: 'black',
      strokeWidth: 4,
    });

    layer.add(rect);
    stage.add(layer);

    draws = 0;

    layer.on('draw', function () {
      //console.log('draw')
      draws++;
    });

    layer.draw();
    layer.draw();
    layer.draw();

    assert.equal(draws, 3, 'draw count should be 3');

    layer.batchDraw();
    layer.batchDraw();
    layer.batchDraw();

    assert.notEqual(draws, 6, 'should not be 6 draws');
  });

  // ======================================================
  test('stage batch draw', function () {
    var stage = addStage();
    var layer = new Konva.Layer();
    var rect = new Konva.Rect({
      x: 200,
      y: 100,
      width: 100,
      height: 50,
      fill: 'green',
      stroke: 'black',
      strokeWidth: 4,
    });

    layer.add(rect);
    stage.add(layer);

    draws = 0;

    layer.on('draw', function () {
      //console.log('draw')
      draws++;
    });

    stage.draw();
    stage.draw();
    stage.draw();

    assert.equal(draws, 3, 'draw count should be 3');

    stage.batchDraw();
    stage.batchDraw();
    stage.batchDraw();

    assert.notEqual(draws, 6, 'should not be 6 draws');
  });
});