Roll Observatory packages and add a roll script

packages/charted/test.disabled/interpolators/easing_test.dart

+/*
+ * Copyright 2014 Google Inc. All rights reserved.
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
+
+part of charted.test.interpolators;
+
+testEasing() {
+  test('easeClamp clamps function returned value to [0, 1]', () {
+    EasingFn f = (t) => t;
+    EasingFn clampedFn = clampEasingFn(f);
+    expect(clampedFn(-1), equals(0));
+    expect(clampedFn(0), equals(0));
+    expect(clampedFn(0.5), equals(0.5));
+    expect(clampedFn(1), equals(1));
+    expect(clampedFn(1.5), equals(1));
+  });
+
+  test('easeReverse returns the reversed ease function of parameter', () {
+    EasingFn f = (t) => t * t;
+    EasingFn reversedFn = reverseEasingFn(f);
+    expect(reversedFn(0), equals(0));
+    expect(reversedFn(0.5), equals(0.75));
+    expect(reversedFn(1), equals(1));
+  });
+
+  test('easeReflect returns the reflected ease function of parameter', () {
+    EasingFn f = (t) => t * t;
+    EasingFn reflectedFn = reflectEasingFn(f);
+    expect(reflectedFn(0), equals(0));
+    expect(reflectedFn(0.25), equals(0.125));
+    expect(reflectedFn(0.5), equals(0.5));
+    expect(reflectedFn(0.75), equals(0.875));
+    expect(reflectedFn(1), equals(1));
+  });
+
+  test('easePoly returns the pow ease function', () {
+    EasingFn fn = easePoly(3);
+    expect(fn(0), equals(0));
+    expect(fn(0.5), equals(0.125));
+    expect(fn(1), equals(1));
+  });
+
+  test('easeCubicInOut returns the in-out ease function', () {
+    EasingFn fn = easeCubicInOut();
+    expect(fn(0), equals(0));
+    expect(fn(0.25), equals(0.0625));
+    expect(fn(0.5), equals(0.5));
+    expect(fn(0.75), equals(0.9375));
+    expect(fn(1), equals(1));
+  });
+
+  test('easeSin returns the sin ease function', () {
+    EasingFn fn = easeSin();
+    expect(fn(0), equals(0));
+    expect(fn(2 / 3), closeTo(0.5, EPSILON));
+    expect(fn(1),  closeTo(1, EPSILON));
+  });
+
+  test('easeExp returns the sin ease function', () {
+    EasingFn fn = easeExp();
+    expect(fn(0), equals(0.0009765625));
+    expect(fn(0.5), equals(0.03125));
+    expect(fn(1),  equals(1));
+  });
+
+  test('easeCircle returns the sin ease function', () {
+    EasingFn fn = easeCircle();
+    expect(fn(0), equals(0));
+    expect(fn(0.5), closeTo(0.1339745962155614, EPSILON));
+    expect(fn(1),  equals(1));
+  });
+
+  test('easeElastic returns an elastic ease function', () {
+    EasingFn fn = easeElastic();
+    expect(fn(0), closeTo(0.7966042495754591, EPSILON));
+    expect(fn(0.25), closeTo(1.0929845855896863, EPSILON));
+    expect(fn(0.5), closeTo(0.9754637077195417, EPSILON));
+    expect(fn(0.75), closeTo(1.0052459611883011, EPSILON));
+    expect(fn(1), closeTo(0.9990238855152622, EPSILON));
+  });
+
+  test('easeBack returns a back ease function', () {
+    EasingFn fn = easeBack();
+    expect(fn(0), closeTo(0, EPSILON));
+    expect(fn(0.25), closeTo(-0.06413656250000001, EPSILON));
+    expect(fn(0.5), closeTo(-0.08769750000000004, EPSILON));
+    expect(fn(0.75), closeTo(0.1825903124999999, EPSILON));
+    expect(fn(1), closeTo(1, EPSILON));
+  });
+
+  test('easeBounce returns a bounce ease function', () {
+    EasingFn fn = easeBounce();
+    expect(fn(0), closeTo(0, EPSILON));
+    expect(fn(0.1), closeTo(0.075625, EPSILON));
+    expect(fn(0.2), closeTo(0.3025, EPSILON));
+    expect(fn(0.3), closeTo(0.680625, EPSILON));
+    expect(fn(0.4), closeTo(0.91, EPSILON));
+    expect(fn(0.5), closeTo(0.765625, EPSILON));
+    expect(fn(0.6), closeTo(0.7725, EPSILON));
+    expect(fn(0.7), closeTo(0.930625, EPSILON));
+    expect(fn(0.8), closeTo(0.94, EPSILON));
+    expect(fn(0.9), closeTo(0.988125, EPSILON));
+    expect(fn(1), closeTo(1, EPSILON));
+  });
+}