Roll Observatory packages and add a roll script

packages/charted/test.disabled/scale/linear_scale_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.scale;
+
+testLinearScale() {
+  group('LinearScale', () {
+    test('applies a bilinearScale when domain length is 2', () {
+      LinearScale linear = new LinearScale([1, 2], [5, 8]);
+      expect(linear.apply(0), equals(2));
+      expect(linear.apply(1), equals(5));
+      expect(linear.apply(1.5), equals(6.5));
+      expect(linear.apply(2), equals(8));
+      expect(linear.invert(5), equals(1));
+      expect(linear.invert(6.5), equals(1.5));
+      expect(linear.invert(8), equals(2));
+    });
+    test('applies a polylinearScale when domain length is larger than 2', () {
+      LinearScale linear = new LinearScale([1, 2, 3], [5, 8, 7]);
+      expect(linear.apply(1), equals(5));
+      expect(linear.apply(1.5), equals(6.5));
+      expect(linear.apply(2), equals(8));
+      expect(linear.apply(2.5), equals(7.5));
+      expect(linear.apply(3), equals(7));
+    });
+  });
+
+  test('LinearScale supports setting clamp to clamp range', () {
+    LinearScale linear = new LinearScale([1, 2], [5, 8],
+        interpolateNumber, true);
+    expect(linear.apply(0), equals(5));
+    expect(linear.apply(1), equals(5));
+    expect(linear.apply(1.5), equals(6.5));
+    expect(linear.apply(2), equals(8));
+    expect(linear.apply(5), equals(8));
+  });
+
+  test('LinearScale.rangeRound sets the interpolator to interpolateRound', () {
+    LinearScale linear = new LinearScale([1, 2]);
+    linear.rangeRound([5, 8]);
+    expect(linear.apply(1), equals(5));
+    expect(linear.apply(1.5), equals(7));
+    expect(linear.apply(2), equals(8));
+  });
+
+  test('LinearScale.ticks sets tick number and returns tick values', () {
+    LinearScale linear = new LinearScale([0, 10], [1, 100]);
+    expect(linear.ticks(2), orderedEquals([0, 5, 10]));
+    expect(linear.ticks(3), orderedEquals([0, 5, 10]));
+    expect(linear.ticks(4), orderedEquals([0, 2, 4, 6, 8, 10]));
+    expect(linear.ticks(5), orderedEquals([0, 2, 4, 6, 8, 10]));
+    expect(linear.ticks(6), orderedEquals([0, 2, 4, 6, 8, 10]));
+    expect(linear.ticks(7), orderedEquals([0, 2, 4, 6, 8, 10]));
+    expect(linear.ticks(8), orderedEquals([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]));
+    expect(linear.ticks(9), orderedEquals([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]));
+    expect(linear.ticks(10), orderedEquals([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]));
+  });
+
+  test('LinearScale.tickFormat formats tick values by specified formatter', () {
+    // Default formatter
+    LinearScale linear = new LinearScale([0, 1], [1, 100]);
+    expect(linear.ticks(2).map((d) => linear.createTickFormatter(2)(d)),
+        orderedEquals(['0.0', '0.5', '1.0']));
+    expect(linear.ticks(5).map((d) => linear.createTickFormatter(5)(d)),
+        orderedEquals(['0.0', '0.2', '0.4', '0.6', '0.8', '1.0']));
+    expect(linear.ticks(10).map((d) => linear.createTickFormatter(10)(d)),
+        orderedEquals(['0.0', '0.1', '0.2', '0.3', '0.4', '0.5',
+                       '0.6', '0.7', '0.8', '0.9', '1.0' ]));
+    // Specified formatter
+    expect(linear.ticks(2).map((d) => linear.createTickFormatter(2, '+%')(d)),
+        orderedEquals(['+0%', '+50%', '+100%']));
+    expect(linear.ticks(5).map((d) => linear.createTickFormatter(5, '+%')(d)),
+        orderedEquals(['+0%', '+20%', '+40%', '+60%', '+80%', '+100%']));
+    expect(linear.ticks(10).map((d) => linear.createTickFormatter(10, '+%')(d)),
+        orderedEquals(['+0%', '+10%', '+20%', '+30%', '+40%', '+50%',
+                       '+60%', '+70%', '+80%', '+90%', '+100%']));
+  });
+
+  test('LinearScale.nice extends the domain to nice round values', () {
+    LinearScale linear = new LinearScale([0.5, 10.6], [1, 100]);
+    linear.nice(10);
+    expect(linear.domain, orderedEquals([0, 11]));
+    linear.domain = [0.5, 10.6];
+    linear.nice(4);
+    expect(linear.domain, orderedEquals([0, 12]));
+  });
+}