Revision control
Copy as Markdown
// Copyright (C) 2016 Klaralvdalens Datakonsult AB (KDAB).
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "buttonaxisinput_p.h"
#include <Qt3DInput/qbuttonaxisinput.h>
#include <Qt3DInput/qabstractphysicaldevice.h>
#include <Qt3DInput/private/qabstractphysicaldevicebackendnode_p.h>
#include <Qt3DInput/private/qbuttonaxisinput_p.h>
#include <Qt3DInput/private/utils_p.h>
QT_BEGIN_NAMESPACE
namespace Qt3DInput {
namespace Input {
ButtonAxisInput::ButtonAxisInput()
: AbstractAxisInput()
, m_scale(0.0f)
, m_acceleration(-1.0f)
, m_deceleration(-1.0f)
, m_speedRatio(0.0f)
, m_lastUpdateTime(0)
{
}
void ButtonAxisInput::cleanup()
{
m_scale = 0.0f;
m_buttons.clear();
m_acceleration = -1.0f;
m_deceleration = -1.0f;
AbstractAxisInput::cleanup();
}
void ButtonAxisInput::updateSpeedRatio(qint64 currentTime, ButtonAxisInput::UpdateType type)
{
const float accel = (type == Accelerate) ? acceleration() : -deceleration();
// Was in nanoseconds, while acceleration will be in units per square seconds
const float delta = m_lastUpdateTime ? (currentTime - m_lastUpdateTime) / 1000000000.0f : 0.0f;
const float speedRatio = m_speedRatio + delta * accel;
// Clamp it
m_speedRatio = qMax(0.0f, qMin(speedRatio, 1.0f));
// If we stopped, time to start over
if (type == Decelerate && m_speedRatio == 0.0f)
m_lastUpdateTime = 0;
else
m_lastUpdateTime = currentTime;
}
void ButtonAxisInput::syncFromFrontEnd(const Qt3DCore::QNode *frontEnd, bool firstTime)
{
AbstractAxisInput::syncFromFrontEnd(frontEnd, firstTime);
const QButtonAxisInput *node = qobject_cast<const QButtonAxisInput *>(frontEnd);
if (!node)
return;
m_scale = node->scale();
m_buttons = node->buttons();
m_acceleration = node->acceleration();
m_deceleration = node->deceleration();
}
namespace {
bool anyOfRequiredButtonsPressed(const QList<int> &buttons, QAbstractPhysicalDeviceBackendNode *physicalDeviceBackend)
{
bool validButtonWasPressed = false;
for (int button : buttons) {
if (physicalDeviceBackend->isButtonPressed(button)) {
validButtonWasPressed = true;
break;
}
}
return validButtonWasPressed;
}
} // anonymous
float ButtonAxisInput::process(InputHandler *inputHandler, qint64 currentTime)
{
if (!isEnabled())
return 0.0f;
if (m_buttons.isEmpty())
return 0.0f;
QAbstractPhysicalDeviceBackendNode *physicalDeviceBackend = Utils::physicalDeviceForInput(this, inputHandler);
if (!physicalDeviceBackend)
return 0.0f;
// TO DO: Linear Curver for the progression of the scale value
if (anyOfRequiredButtonsPressed(m_buttons, physicalDeviceBackend))
updateSpeedRatio(currentTime, ButtonAxisInput::Accelerate);
else if (m_speedRatio != 0.0f)
updateSpeedRatio(currentTime, ButtonAxisInput::Decelerate);
return m_speedRatio * m_scale;
}
} // Input
} // Qt3DInput
QT_END_NAMESPACE