| Flutter Impeller |

trig_unittests.cc
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include <math.h>
6
7 #include "fml/logging.h"
8 #include "gtest/gtest.h"
9
10 #include "flutter/impeller/geometry/trig.h"
11
12 namespace impeller {
13 namespace testing {
14
15 TEST(TrigTest, TrigAngles) {
16 {
17 Trig trig(Degrees(0.0));
18 EXPECT_EQ(trig.cos, 1.0);
19 EXPECT_EQ(trig.sin, 0.0);
20 }
21
22 {
23 Trig trig(Radians(0.0));
24 EXPECT_EQ(trig.cos, 1.0);
25 EXPECT_EQ(trig.sin, 0.0);
26 }
27
28 {
29 Trig trig(Degrees(30.0));
30 EXPECT_NEAR(trig.cos, sqrt(0.75), kEhCloseEnough);
31 EXPECT_NEAR(trig.sin, 0.5, kEhCloseEnough);
32 }
33
34 {
35 Trig trig(Radians(kPi / 6.0));
36 EXPECT_NEAR(trig.cos, sqrt(0.75), kEhCloseEnough);
37 EXPECT_NEAR(trig.sin, 0.5, kEhCloseEnough);
38 }
39
40 {
41 Trig trig(Degrees(60.0));
42 EXPECT_NEAR(trig.cos, 0.5, kEhCloseEnough);
43 EXPECT_NEAR(trig.sin, sqrt(0.75), kEhCloseEnough);
44 }
45
46 {
47 Trig trig(Radians(kPi / 3.0));
48 EXPECT_NEAR(trig.cos, 0.5, kEhCloseEnough);
49 EXPECT_NEAR(trig.sin, sqrt(0.75), kEhCloseEnough);
50 }
51
52 {
53 Trig trig(Degrees(90.0));
54 EXPECT_NEAR(trig.cos, 0.0, kEhCloseEnough);
55 EXPECT_NEAR(trig.sin, 1.0, kEhCloseEnough);
56 }
57
58 {
59 Trig trig(Radians(kPi / 2.0));
60 EXPECT_NEAR(trig.cos, 0.0, kEhCloseEnough);
61 EXPECT_NEAR(trig.sin, 1.0, kEhCloseEnough);
62 }
63 }
64
65 TEST(TrigTest, MultiplyByScalarRadius) {
66 for (int i = 0; i <= 360; i++) {
67 for (int i = 1; i <= 10; i++) {
68 Scalar radius = i * 5.0f;
69 EXPECT_EQ(Trig(Degrees(i)) * radius,
70 Point(radius * std::cos(i * kPi / 180),
71 radius * std::sin(i * kPi / 180)))
72 << "at " << i << " degrees and radius " << radius;
73 }
74 }
75 }
76
77 } // namespace testing
78 } // namespace impeller
impeller::Scalar
float Scalar
Definition: scalar.h:18
trig.h
impeller::kEhCloseEnough
constexpr float kEhCloseEnough
Definition: constants.h:56
impeller::kPi
constexpr float kPi
Definition: constants.h:26
impeller::Point
TPoint< Scalar > Point
Definition: point.h:308
impeller::Trig::cos
double cos
Definition: trig.h:24
impeller::testing::TEST
TEST(CanvasRecorder, Save)
Definition: canvas_recorder_unittests.cc:61
impeller::Radians
Definition: scalar.h:38
impeller::Degrees
Definition: scalar.h:46
impeller
Definition: aiks_context.cc:10
impeller::Trig::sin
double sin
Definition: trig.h:25
impeller::Trig
A structure to store the sine and cosine of an angle.
Definition: trig.h:16