dolphin/Source/Core/InputCommon/ControllerEmu/ControlGroup/AnalogStick.cpp

// Copyright 2017 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#include "InputCommon/ControllerEmu/ControlGroup/AnalogStick.h"

#include <algorithm>
#include <cmath>
#include <memory>

#include "Common/Common.h"

#include "InputCommon/ControlReference/ControlReference.h"
#include "InputCommon/ControllerEmu/Control/Control.h"
#include "InputCommon/ControllerEmu/Control/Input.h"
#include "InputCommon/ControllerEmu/ControllerEmu.h"

namespace ControllerEmu
{
AnalogStick::AnalogStick(const char* const name_, ControlState default_radius)
    : AnalogStick(name_, name_, default_radius)
{
}

AnalogStick::AnalogStick(const char* const name_, const char* const ui_name_,
                         ControlState default_radius)
    : ControlGroup(name_, ui_name_, GroupType::Stick)
{
  for (auto& named_direction : named_directions)
    controls.emplace_back(std::make_unique<Input>(named_direction));

  controls.emplace_back(std::make_unique<Input>(_trans("Modifier")));
  numeric_settings.emplace_back(
      std::make_unique<NumericSetting>(_trans("Radius"), default_radius, 0, 100));
  numeric_settings.emplace_back(std::make_unique<NumericSetting>(_trans("Dead Zone"), 0, 0, 50));
}

void AnalogStick::GetState(ControlState* const x, ControlState* const y)
{
  ControlState yy = controls[0]->control_ref->State() - controls[1]->control_ref->State();
  ControlState xx = controls[3]->control_ref->State() - controls[2]->control_ref->State();

  ControlState radius = numeric_settings[SETTING_RADIUS]->GetValue();
  ControlState deadzone = numeric_settings[SETTING_DEADZONE]->GetValue();
  ControlState m = controls[4]->control_ref->State();

  ControlState ang = atan2(yy, xx);
  ControlState ang_sin = sin(ang);
  ControlState ang_cos = cos(ang);

  ControlState dist = sqrt(xx * xx + yy * yy);

  // dead zone code
  dist = std::max(0.0, dist - deadzone);
  dist /= (1 - deadzone);

  // radius
  dist *= radius;

  // The modifier halves the distance by 50%, which is useful
  // for keyboard controls.
  if (m)
    dist *= 0.5;

  yy = std::max(-1.0, std::min(1.0, ang_sin * dist));
  xx = std::max(-1.0, std::min(1.0, ang_cos * dist));

  *y = yy;
  *x = xx;
}
}  // namespace ControllerEmu