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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/stylus_state_modeler.h"
#include <limits>
#include "ink_stroke_modeler/internal/internal_types.h"
#include "ink_stroke_modeler/internal/utils.h"
#include "ink_stroke_modeler/params.h"
#include "ink_stroke_modeler/types.h"
namespace ink {
namespace stroke_model {
void StylusStateModeler::Update(Vec2 position, const StylusState &state) {
if (state.pressure < 0) received_unknown_pressure_ = true;
if (state.tilt < 0) received_unknown_tilt_ = true;
if (state.orientation < 0) received_unknown_orientation_ = true;
if (received_unknown_pressure_ && received_unknown_tilt_ &&
received_unknown_orientation_) {
// We've stopped tracking all fields, so there's no need to keep updating.
positions_and_states_.clear();
return;
}
positions_and_states_.push_back({position, state});
if (positions_and_states_.size() > params_.max_input_samples) {
positions_and_states_.pop_front();
}
}
void StylusStateModeler::Reset(const StylusStateModelerParams ¶ms) {
params_ = params;
positions_and_states_.clear();
received_unknown_pressure_ = false;
received_unknown_tilt_ = false;
received_unknown_orientation_ = false;
}
StylusState StylusStateModeler::Query(Vec2 position) const {
if (positions_and_states_.empty())
return {.pressure = -1, .tilt = -1, .orientation = -1};
if (positions_and_states_.size() == 1) {
const auto &state = positions_and_states_.front().state;
return {
.pressure = received_unknown_pressure_ ? -1 : state.pressure,
.tilt = received_unknown_tilt_ ? -1 : state.tilt,
.orientation = received_unknown_orientation_ ? -1 : state.orientation};
}
int closest_segment = -1;
float min_distance = std::numeric_limits<float>::infinity();
float interp_value = 0;
for (int i = 0; i < positions_and_states_.size() - 1; ++i) {
const Vec2 segment_start = positions_and_states_[i].position;
const Vec2 segment_end = positions_and_states_[i + 1].position;
float param = NearestPointOnSegment(segment_start, segment_end, position);
float distance =
Distance(position, Interp(segment_start, segment_end, param));
if (distance <= min_distance) {
closest_segment = i;
min_distance = distance;
interp_value = param;
}
}
auto from_state = positions_and_states_[closest_segment].state;
auto to_state = positions_and_states_[closest_segment + 1].state;
return StylusState{
.pressure =
received_unknown_pressure_
? -1
: Interp(from_state.pressure, to_state.pressure, interp_value),
.tilt = received_unknown_tilt_
? -1
: Interp(from_state.tilt, to_state.tilt, interp_value),
.orientation = received_unknown_orientation_
? -1
: InterpAngle(from_state.orientation,
to_state.orientation, interp_value)};
}
} // namespace stroke_model
} // namespace ink
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