Roll Observatory packages and add a roll script

packages/charted/test.disabled/scale/log_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;
+
+testLogScale() {
+  group('LogScale.domain', () {
+    test('is positive if the first element in domain is non-negative', () {
+      LogScale log = new LogScale();
+      log.domain = [1, 100];
+      expect(log.apply(0.1), closeTo(-0.5, EPSILON));
+      expect(log.apply(1), equals(0));
+      expect(log.apply(10), equals(0.5));
+      expect(log.apply(100), equals(1));
+      expect(log.apply(1000), closeTo(1.5, EPSILON));
+      expect(log.invert(0), equals(1));
+      expect(log.invert(0.5), equals(10));
+      expect(log.invert(1), equals(100));
+    });
+    test('is negative if the first element in domain is negative', () {
+      LogScale log = new LogScale();
+      log.domain = [-1, -100];
+      expect(log.apply(-1), equals(0));
+      expect(log.apply(-10), equals(0.5));
+      expect(log.apply(-100), equals(1));
+      expect(log.invert(0), equals(-1));
+      expect(log.invert(0.5), equals(-10));
+      expect(log.invert(1), equals(-100));
+    });
+  });
+
+  test('LogScale supports setting clamp to clamp range', () {
+    LogScale log = new LogScale();
+    log.domain = [1, 100];
+    log.clamp = true;
+    expect(log.apply(0.1), equals(0));
+    expect(log.apply(1), equals(0));
+    expect(log.apply(10), equals(0.5));
+    expect(log.apply(100), equals(1));
+    expect(log.apply(1000), equals(1));
+  });
+
+  test('LogScale supports setting base of log', () {
+    LogScale log = new LogScale();
+    log.base = 2;
+    log.domain = [1, 8];
+    log.range = [1, 8];
+    expect(log.apply(1), equals(1));
+    expect(log.apply(4), closeTo(5.666666666666666, EPSILON));
+    expect(log.apply(8), equals(8));
+  });
+
+  test('LogScale.rangeRound sets the interpolator to interpolateRound', () {
+    LogScale log = new LogScale();
+    log.domain = [1, 8];
+    log.rangeRound([1, 8]);
+    expect(log.apply(1), equals(1));
+    expect(log.apply(4), equals(6));
+    expect(log.apply(8), equals(8));
+  });
+
+  test('LogScale.ticks returns representative values from domain', () {
+    LogScale log = new LogScale();
+    log.domain = [1, 100];
+    expect(log.ticks(), orderedEquals(
+        [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100]));
+    log.domain = [-1, -100];
+    expect(log.ticks(), orderedEquals([-100, -90, -80, -70, -60, -50, -40, -30,
+        -20, -10, -9, -8, -7, -6, -5, -4, -3, -2, -1]));
+  });
+
+  test('LogScale.tickFormat formats tick values by specified formatter', () {
+    // Default formatter
+    LogScale log = new LogScale();
+    log.domain = [1, 10];
+    expect(log.ticks().map((d) => log.createTickFormatter(20)(d)),
+        orderedEquals(['1e+0', '2e+0', '3e+0', '4e+0', '5e+0', '6e+0', '7e+0',
+                       '8e+0', '9e+0', '1e+1']));
+    // Specified formatter
+    log.domain = [0.1, 1];
+    expect(log.ticks().map((d) => log.createTickFormatter(20, '+%')(d)),
+        orderedEquals(['+10%', '+20%', '+30%', '+40%', '+50%', '+60%', '+70%',
+                       '+80%', '+90%', '+100%']));
+  });
+
+  test('LogScale.nice extends the domain to nice round values', () {
+    LogScale log = new LogScale();
+    log.domain = [0.20147987687960267, 0.996679553296417];
+    log.nice();
+    expect(log.domain, orderedEquals([0.1, 1]));
+    log.domain = [-0.20147987687960267, -0.996679553296417];
+    log.nice();
+    expect(log.domain, orderedEquals([-0.1, -1]));
+  });
+}