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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gfx/interpolated_transform.h"
#include "base/basictypes.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace {
void CheckApproximatelyEqual(const ui::Transform& lhs,
const ui::Transform& rhs) {
for (int i = 0; i < 4; ++i) {
for (int j = 0; j < 4; ++j) {
EXPECT_FLOAT_EQ(lhs.matrix().get(i, j), rhs.matrix().get(i, j));
}
}
}
float NormalizeAngle(float angle) {
while (angle < 0.0f) {
angle += 360.0f;
}
while (angle > 360.0f) {
angle -= 360.0f;
}
return angle;
}
} // namespace
TEST(InterpolatedTransformTest, InterpolatedRotation) {
ui::InterpolatedRotation interpolated_rotation(0, 100);
ui::InterpolatedRotation interpolated_rotation_diff_start_end(
0, 100, 100, 200);
for (int i = 0; i <= 100; ++i) {
ui::Transform rotation;
rotation.SetRotate(i);
ui::Transform interpolated = interpolated_rotation.Interpolate(i / 100.0f);
CheckApproximatelyEqual(rotation, interpolated);
interpolated = interpolated_rotation_diff_start_end.Interpolate(i + 100);
CheckApproximatelyEqual(rotation, interpolated);
}
}
TEST(InterpolatedTransformTest, InterpolatedScale) {
ui::InterpolatedScale interpolated_scale(gfx::Point3f(0, 0, 0),
gfx::Point3f(100, 100, 100));
ui::InterpolatedScale interpolated_scale_diff_start_end(
gfx::Point3f(0, 0, 0), gfx::Point3f(100, 100, 100), 100, 200);
for (int i = 0; i <= 100; ++i) {
ui::Transform scale;
scale.SetScale(i, i);
ui::Transform interpolated = interpolated_scale.Interpolate(i / 100.0f);
CheckApproximatelyEqual(scale, interpolated);
interpolated = interpolated_scale_diff_start_end.Interpolate(i + 100);
CheckApproximatelyEqual(scale, interpolated);
}
}
TEST(InterpolatedTransformTest, InterpolatedTranslate) {
ui::InterpolatedTranslation interpolated_xform(gfx::Point(0, 0),
gfx::Point(100, 100));
ui::InterpolatedTranslation interpolated_xform_diff_start_end(
gfx::Point(0, 0), gfx::Point(100, 100), 100, 200);
for (int i = 0; i <= 100; ++i) {
ui::Transform xform;
xform.SetTranslate(i, i);
ui::Transform interpolated = interpolated_xform.Interpolate(i / 100.0f);
CheckApproximatelyEqual(xform, interpolated);
interpolated = interpolated_xform_diff_start_end.Interpolate(i + 100);
CheckApproximatelyEqual(xform, interpolated);
}
}
TEST(InterpolatedTransformTest, InterpolatedRotationAboutPivot) {
gfx::Point pivot(100, 100);
gfx::Point above_pivot(100, 200);
ui::InterpolatedRotation rot(0, 90);
ui::InterpolatedTransformAboutPivot interpolated_xform(
pivot,
new ui::InterpolatedRotation(0, 90));
ui::Transform result = interpolated_xform.Interpolate(0.0f);
CheckApproximatelyEqual(ui::Transform(), result);
result = interpolated_xform.Interpolate(1.0f);
gfx::Point expected_result = pivot;
result.TransformPoint(pivot);
EXPECT_EQ(expected_result, pivot);
expected_result = gfx::Point(0, 100);
result.TransformPoint(above_pivot);
EXPECT_EQ(expected_result, above_pivot);
}
TEST(InterpolatedTransformTest, InterpolatedScaleAboutPivot) {
gfx::Point pivot(100, 100);
gfx::Point above_pivot(100, 200);
ui::InterpolatedTransformAboutPivot interpolated_xform(
pivot,
new ui::InterpolatedScale(gfx::Point3f(1, 1, 1), gfx::Point3f(2, 2, 2)));
ui::Transform result = interpolated_xform.Interpolate(0.0f);
CheckApproximatelyEqual(ui::Transform(), result);
result = interpolated_xform.Interpolate(1.0f);
gfx::Point expected_result = pivot;
result.TransformPoint(pivot);
EXPECT_EQ(expected_result, pivot);
expected_result = gfx::Point(100, 300);
result.TransformPoint(above_pivot);
EXPECT_EQ(expected_result, above_pivot);
}
TEST(InterpolatedTransformTest, FactorTRS) {
for (int degrees = 0; degrees < 360; ++degrees) {
// build a transformation matrix.
ui::Transform transform;
transform.SetScale(degrees + 1, 2 * degrees + 1);
transform.ConcatRotate(degrees);
transform.ConcatTranslate(degrees * 2, -degrees * 3);
// factor the matrix
gfx::Point translation;
float rotation;
gfx::Point3f scale;
bool success = ui::InterpolatedTransform::FactorTRS(transform,
&translation,
&rotation,
&scale);
EXPECT_TRUE(success);
EXPECT_FLOAT_EQ(translation.x(), degrees * 2);
EXPECT_FLOAT_EQ(translation.y(), -degrees * 3);
EXPECT_FLOAT_EQ(NormalizeAngle(rotation), degrees);
EXPECT_FLOAT_EQ(scale.x(), degrees + 1);
EXPECT_FLOAT_EQ(scale.y(), 2 * degrees + 1);
}
}
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