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// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "ink_stroke_modeler/internal/wobble_smoother.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "ink_stroke_modeler/internal/type_matchers.h"
#include "ink_stroke_modeler/params.h"
#include "ink_stroke_modeler/types.h"
namespace ink {
namespace stroke_model {
namespace {
const WobbleSmootherParams kDefaultParams{
.timeout = Duration(.04), .speed_floor = 1.31, .speed_ceiling = 1.44};
TEST(WobbleSmootherTest, SlowStraightLine) {
// The line moves at 1 cm/s, which is below the floor of 1.31 cm/s.
WobbleSmoother filter;
filter.Reset(kDefaultParams, {3, 4}, Time{1});
EXPECT_THAT(filter.Update({3.016, 4}, Time{1.016}), Vec2Eq({3.008, 4}));
EXPECT_THAT(filter.Update({3.032, 4}, Time{1.032}), Vec2Eq({3.016, 4}));
EXPECT_THAT(filter.Update({3.048, 4}, Time{1.048}), Vec2Eq({3.032, 4}));
EXPECT_THAT(filter.Update({3.064, 4}, Time{1.064}), Vec2Eq({3.048, 4}));
}
TEST(WobbleSmootherTest, FastStraightLine) {
// The line moves at 1.5 cm/s, which is above the ceiling of 1.44 cm/s.
WobbleSmoother filter;
filter.Reset(kDefaultParams, {-1, 0}, Time{0});
EXPECT_THAT(filter.Update({-1, .024}, Time{.016}), Vec2Eq({-1, .024}));
EXPECT_THAT(filter.Update({-1, .048}, Time{.032}), Vec2Eq({-1, .048}));
EXPECT_THAT(filter.Update({-1, .072}, Time{.048}), Vec2Eq({-1, .072}));
}
TEST(WobbleSmootherTest, SlowZigZag) {
// The line moves at 1 cm/s, which is below the floor of 1.31 cm/s.
WobbleSmoother filter;
filter.Reset(kDefaultParams, {1, 2}, Time{5});
EXPECT_THAT(filter.Update({1.016, 2}, Time{5.016}), Vec2Eq({1.008, 2}));
EXPECT_THAT(filter.Update({1.016, 2.016}, Time{5.032}),
Vec2Eq({1.0106667, 2.0053333}));
EXPECT_THAT(filter.Update({1.032, 2.016}, Time{5.048}),
Vec2Eq({1.0213333, 2.0106667}));
EXPECT_THAT(filter.Update({1.032, 2.032}, Time{5.064}),
Vec2Eq({1.0266667, 2.0213333}));
EXPECT_THAT(filter.Update({1.048, 2.032}, Time{5.080}),
Vec2Eq({1.0373333, 2.0266667}));
EXPECT_THAT(filter.Update({1.048, 2.048}, Time{5.096}),
Vec2Eq({1.0426667, 2.0373333}));
}
TEST(WobbleSmootherTest, FastZigZag) {
// The line moves at 1.5 cm/s, which is above the ceiling of 1.44 cm/s.
WobbleSmoother filter;
filter.Reset(kDefaultParams, {7, 3}, Time{8});
EXPECT_THAT(filter.Update({7, 3.024}, Time{8.016}), Vec2Eq({7, 3.024}));
EXPECT_THAT(filter.Update({7.024, 3.024}, Time{8.032}),
Vec2Eq({7.024, 3.024}));
EXPECT_THAT(filter.Update({7.024, 3.048}, Time{8.048}),
Vec2Eq({7.024, 3.048}));
EXPECT_THAT(filter.Update({7.048, 3.048}, Time{8.064}),
Vec2Eq({7.048, 3.048}));
}
} // namespace
} // namespace stroke_model
} // namespace ink
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