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Diffstat (limited to 'examples/datavisualization/texturesurface/custominputhandler.cpp')
-rw-r--r-- | examples/datavisualization/texturesurface/custominputhandler.cpp | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/examples/datavisualization/texturesurface/custominputhandler.cpp b/examples/datavisualization/texturesurface/custominputhandler.cpp new file mode 100644 index 00000000..9072a0b4 --- /dev/null +++ b/examples/datavisualization/texturesurface/custominputhandler.cpp @@ -0,0 +1,178 @@ +/**************************************************************************** +** +** Copyright (C) 2014 Digia Plc +** All rights reserved. +** For any questions to Digia, please use contact form at http://qt.digia.com +** +** This file is part of the QtDataVisualization module. +** +** Licensees holding valid Qt Enterprise licenses may use this file in +** accordance with the Qt Enterprise License Agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Digia. +** +** If you have questions regarding the use of this file, please use +** contact form at http://qt.digia.com +** +****************************************************************************/ + +#include "custominputhandler.h" + +#include <QtDataVisualization/Q3DCamera> +#include <QtCore/qmath.h> + +#include <QDebug> + +CustomInputHandler::CustomInputHandler(QAbstract3DGraph *graph, QObject *parent) : + Q3DInputHandler(parent), + m_highlight(0), + m_mousePressed(false), + m_state(StateNormal), + m_axisX(0), + m_axisZ(0), + m_speedModifier(20.0f) +{ + // Connect to the item selection signal from graph + connect(graph, &QAbstract3DGraph::selectedElementChanged, this, + &CustomInputHandler::handleElementSelected); +} + +void CustomInputHandler::mousePressEvent(QMouseEvent *event, const QPoint &mousePos) +{ + if (Qt::LeftButton == event->button()) { + m_highlight->setVisible(false); + m_mousePressed = true; + } + Q3DInputHandler::mousePressEvent(event, mousePos); +} + +void CustomInputHandler::wheelEvent(QWheelEvent *event) +{ + float delta = float(event->delta()); + + m_axisXMinValue += delta; + m_axisXMaxValue -= delta; + m_axisZMinValue += delta; + m_axisZMaxValue -= delta; + checkConstraints(); + + float y = (m_axisXMaxValue - m_axisXMinValue) * m_aspectRatio; + + m_axisX->setRange(m_axisXMinValue, m_axisXMaxValue); + m_axisY->setRange(100.0f, y); + m_axisZ->setRange(m_axisZMinValue, m_axisZMaxValue); +} + +void CustomInputHandler::mouseMoveEvent(QMouseEvent *event, const QPoint &mousePos) +{ + // Check if we're trying to drag axis label + if (m_mousePressed && m_state != StateNormal) { + setPreviousInputPos(inputPosition()); + setInputPosition(mousePos); + handleAxisDragging(); + } else { + Q3DInputHandler::mouseMoveEvent(event, mousePos); + } +} + +void CustomInputHandler::mouseReleaseEvent(QMouseEvent *event, const QPoint &mousePos) +{ + Q3DInputHandler::mouseReleaseEvent(event, mousePos); + m_mousePressed = false; + m_state = StateNormal; +} + +void CustomInputHandler::handleElementSelected(QAbstract3DGraph::ElementType type) +{ + switch (type) { + case QAbstract3DGraph::ElementAxisXLabel: + m_state = StateDraggingX; + break; + case QAbstract3DGraph::ElementAxisZLabel: + m_state = StateDraggingZ; + break; + default: + m_state = StateNormal; + break; + } +} + +void CustomInputHandler::handleAxisDragging() +{ + float distance = 0.0f; + + // Get scene orientation from active camera + float xRotation = scene()->activeCamera()->xRotation(); + + // Calculate directional drag multipliers based on rotation + float xMulX = qCos(qDegreesToRadians(xRotation)); + float xMulY = qSin(qDegreesToRadians(xRotation)); + float zMulX = qSin(qDegreesToRadians(xRotation)); + float zMulY = qCos(qDegreesToRadians(xRotation)); + + // Get the drag amount + QPoint move = inputPosition() - previousInputPos(); + + // Adjust axes + switch (m_state) { + case StateDraggingX: + distance = (move.x() * xMulX - move.y() * xMulY) * m_speedModifier; + m_axisXMinValue -= distance; + m_axisXMaxValue -= distance; + if (m_axisXMinValue < m_areaMinValue) { + float dist = m_axisXMaxValue - m_axisXMinValue; + m_axisXMinValue = m_areaMinValue; + m_axisXMaxValue = m_axisXMinValue + dist; + } + if (m_axisXMaxValue > m_areaMaxValue) { + float dist = m_axisXMaxValue - m_axisXMinValue; + m_axisXMaxValue = m_areaMaxValue; + m_axisXMinValue = m_axisXMaxValue - dist; + } + m_axisX->setRange(m_axisXMinValue, m_axisXMaxValue); + break; + case StateDraggingZ: + distance = (move.x() * zMulX + move.y() * zMulY) * m_speedModifier; + m_axisZMinValue += distance; + m_axisZMaxValue += distance; + if (m_axisZMinValue < m_areaMinValue) { + float dist = m_axisZMaxValue - m_axisZMinValue; + m_axisZMinValue = m_areaMinValue; + m_axisZMaxValue = m_axisZMinValue + dist; + } + if (m_axisZMaxValue > m_areaMaxValue) { + float dist = m_axisZMaxValue - m_axisZMinValue; + m_axisZMaxValue = m_areaMaxValue; + m_axisZMinValue = m_axisZMaxValue - dist; + } + m_axisZ->setRange(m_axisZMinValue, m_axisZMaxValue); + break; + default: + break; + } +} + +void CustomInputHandler::checkConstraints() +{ + if (m_axisXMinValue < m_areaMinValue) + m_axisXMinValue = m_areaMinValue; + if (m_axisXMaxValue > m_areaMaxValue) + m_axisXMaxValue = m_areaMaxValue; + // Don't allow too much zoom in + if ((m_axisXMaxValue - m_axisXMinValue) < m_axisXMinRange) { + float adjust = (m_axisXMinRange - (m_axisXMaxValue - m_axisXMinValue)) / 2.0f; + m_axisXMinValue -= adjust; + m_axisXMaxValue += adjust; + } + + if (m_axisZMinValue < m_areaMinValue) + m_axisZMinValue = m_areaMinValue; + if (m_axisZMaxValue > m_areaMaxValue) + m_axisZMaxValue = m_areaMaxValue; + // Don't allow too much zoom in + if ((m_axisZMaxValue - m_axisZMinValue) < m_axisZMinRange) { + float adjust = (m_axisZMinRange - (m_axisZMaxValue - m_axisZMinValue)) / 2.0f; + m_axisZMinValue -= adjust; + m_axisZMaxValue += adjust; + } +} |