fabric.js/test/unit/polygon.js

(function() {

  function getPoints() {
    return [
      {x: 10, y: 12},
      {x: 20, y: 22}
    ];
  }

  var REFERENCE_OBJECT = {
    'type':                     'polygon',
    'originX':                  'left',
    'originY':                  'top',
    'left':                     10,
    'top':                      12,
    'width':                    10,
    'height':                   10,
    'fill':                     'rgb(0,0,0)',
    'stroke':                   null,
    'strokeWidth':              1,
    'strokeDashArray':          null,
    'strokeLineCap':            'butt',
    'strokeLineJoin':           'miter',
    'strokeMiterLimit':         10,
    'scaleX':                   1,
    'scaleY':                   1,
    'angle':                    0,
    'flipX':                    false,
    'flipY':                    false,
    'opacity':                  1,
    'points':                   getPoints(),
    'shadow':                   null,
    'visible':                  true,
    'backgroundColor':          '',
    'clipTo':                   null,
    'fillRule':                 'nonzero',
    'globalCompositeOperation': 'source-over',
    'skewX':                    0,
    'skewY':                    0,
    'transformMatrix':          null
  };

  var REFERENCE_EMPTY_OBJECT = {
    'points': [],
    'width': 0,
    'height': 0,
    'top': 0,
    'left': 0
  };

  QUnit.module('fabric.Polygon');

  test('constructor', function() {
    ok(fabric.Polygon);

    var polygon = new fabric.Polygon(getPoints());

    ok(polygon instanceof fabric.Polygon);
    ok(polygon instanceof fabric.Object);

    equal(polygon.type, 'polygon');
    deepEqual(polygon.get('points'), [ { x: 10, y: 12 }, { x: 20, y: 22 } ]);
  });

  test('complexity', function() {
    var polygon = new fabric.Polygon(getPoints());
    ok(typeof polygon.complexity == 'function');
  });

  test('toObject', function() {
    var polygon = new fabric.Polygon(getPoints());
    ok(typeof polygon.toObject == 'function');

    var objectWithOriginalPoints = fabric.util.object.extend(polygon.toObject(), {
      points: getPoints()
    });

    deepEqual(objectWithOriginalPoints, REFERENCE_OBJECT);
  });

  test('fromObject', function() {
    ok(typeof fabric.Polygon.fromObject == 'function');
    var polygon = fabric.Polygon.fromObject(REFERENCE_OBJECT);
    ok(polygon instanceof fabric.Polygon);
    deepEqual(polygon.toObject(), REFERENCE_OBJECT);
  });

  test('fromElement', function() {
    ok(typeof fabric.Polygon.fromElement == 'function');

    var empty_object = fabric.util.object.extend({}, REFERENCE_OBJECT);
    empty_object = fabric.util.object.extend(empty_object, REFERENCE_EMPTY_OBJECT);

    var elPolygonWithoutPoints = fabric.document.createElement('polygon');

    deepEqual(fabric.Polygon.fromElement(elPolygonWithoutPoints).toObject(), empty_object);

    var elPolygonWithEmptyPoints = fabric.document.createElement('polygon');
    elPolygonWithEmptyPoints.setAttribute('points', '');

    deepEqual(fabric.Polygon.fromElement(elPolygonWithEmptyPoints).toObject(), empty_object);

    var elPolygon = fabric.document.createElement('polygon');

    elPolygon.setAttribute('points', '10,12 20,22');

    var polygon = fabric.Polygon.fromElement(elPolygon);

    ok(polygon instanceof fabric.Polygon);

    var expected = fabric.util.object.extend(
      fabric.util.object.clone(REFERENCE_OBJECT), {
        points: [ { x: 10, y: 12 }, { x: 20, y: 22 } ]
      });

    deepEqual(polygon.toObject(), expected);

    var elPolygonWithAttrs = fabric.document.createElement('polygon');
    elPolygonWithAttrs.setAttribute('points', '10,10 20,20 30,30 10,10');
    elPolygonWithAttrs.setAttribute('fill', 'rgb(255,255,255)');
    elPolygonWithAttrs.setAttribute('opacity', '0.34');
    elPolygonWithAttrs.setAttribute('stroke-width', '3');
    elPolygonWithAttrs.setAttribute('stroke', 'blue');
    elPolygonWithAttrs.setAttribute('transform', 'translate(-10,-20) scale(2)');
    elPolygonWithAttrs.setAttribute('stroke-dasharray', '5, 2');
    elPolygonWithAttrs.setAttribute('stroke-linecap', 'round');
    elPolygonWithAttrs.setAttribute('stroke-linejoin', 'bevil');
    elPolygonWithAttrs.setAttribute('stroke-miterlimit', '5');

    var polygonWithAttrs = fabric.Polygon.fromElement(elPolygonWithAttrs);
    var expectedPoints = [
      { x: 10, y: 10 },
      { x: 20, y: 20 },
      { x: 30, y: 30 },
      { x: 10, y: 10 }
    ];

    deepEqual(polygonWithAttrs.toObject(), fabric.util.object.extend(REFERENCE_OBJECT, {
      'width':            20,
      'height':           20,
      'fill':             'rgb(255,255,255)',
      'stroke':           'blue',
      'strokeWidth':      3,
      'strokeDashArray':  [5, 2],
      'strokeLineCap':    'round',
      'strokeLineJoin':   'bevil',
      'strokeMiterLimit': 5,
      'opacity':          0.34,
      'points':           expectedPoints,
      'top':              10,
      'left':             10,
      'transformMatrix':  [ 2, 0, 0, 2, -10, -20 ]
    }));

    deepEqual(polygonWithAttrs.get('transformMatrix'), [ 2, 0, 0, 2, -10, -20 ]);

    equal(fabric.Polygon.fromElement(), null);
  });
})();