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| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** This file is part of the Qt Data Visualization module of the Qt Toolkit. |
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| ****************************************************************************/ |
| |
| #include "axesinputhandler.h" |
| #include <QtCore/qmath.h> |
| |
| AxesInputHandler::AxesInputHandler(QAbstract3DGraph *graph, QObject *parent) : |
| Q3DInputHandler(parent), |
| m_mousePressed(false), |
| m_state(StateNormal), |
| m_axisX(0), |
| m_axisZ(0), |
| m_axisY(0), |
| m_speedModifier(15.0f) |
| { |
| //! [3] |
| // Connect to the item selection signal from graph |
| connect(graph, &QAbstract3DGraph::selectedElementChanged, this, |
| &AxesInputHandler::handleElementSelected); |
| //! [3] |
| } |
| |
| //! [0] |
| void AxesInputHandler::mousePressEvent(QMouseEvent *event, const QPoint &mousePos) |
| { |
| Q3DInputHandler::mousePressEvent(event, mousePos); |
| if (Qt::LeftButton == event->button()) |
| m_mousePressed = true; |
| } |
| //! [0] |
| |
| //! [2] |
| void AxesInputHandler::mouseMoveEvent(QMouseEvent *event, const QPoint &mousePos) |
| { |
| //! [5] |
| // Check if we're trying to drag axis label |
| if (m_mousePressed && m_state != StateNormal) { |
| //! [5] |
| setPreviousInputPos(inputPosition()); |
| setInputPosition(mousePos); |
| handleAxisDragging(); |
| } else { |
| Q3DInputHandler::mouseMoveEvent(event, mousePos); |
| } |
| } |
| //! [2] |
| |
| //! [1] |
| void AxesInputHandler::mouseReleaseEvent(QMouseEvent *event, const QPoint &mousePos) |
| { |
| Q3DInputHandler::mouseReleaseEvent(event, mousePos); |
| m_mousePressed = false; |
| m_state = StateNormal; |
| } |
| //! [1] |
| |
| void AxesInputHandler::handleElementSelected(QAbstract3DGraph::ElementType type) |
| { |
| //! [4] |
| switch (type) { |
| case QAbstract3DGraph::ElementAxisXLabel: |
| m_state = StateDraggingX; |
| break; |
| case QAbstract3DGraph::ElementAxisYLabel: |
| m_state = StateDraggingY; |
| break; |
| case QAbstract3DGraph::ElementAxisZLabel: |
| m_state = StateDraggingZ; |
| break; |
| default: |
| m_state = StateNormal; |
| break; |
| } |
| //! [4] |
| } |
| |
| void AxesInputHandler::handleAxisDragging() |
| { |
| float distance = 0.0f; |
| |
| //! [6] |
| // Get scene orientation from active camera |
| float xRotation = scene()->activeCamera()->xRotation(); |
| float yRotation = scene()->activeCamera()->yRotation(); |
| //! [6] |
| |
| //! [7] |
| // 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)); |
| //! [7] |
| |
| //! [8] |
| // Get the drag amount |
| QPoint move = inputPosition() - previousInputPos(); |
| |
| // Flip the effect of y movement if we're viewing from below |
| float yMove = (yRotation < 0) ? -move.y() : move.y(); |
| //! [8] |
| |
| //! [9] |
| // Adjust axes |
| switch (m_state) { |
| case StateDraggingX: |
| distance = (move.x() * xMulX - yMove * xMulY) / m_speedModifier; |
| m_axisX->setRange(m_axisX->min() - distance, m_axisX->max() - distance); |
| break; |
| case StateDraggingZ: |
| distance = (move.x() * zMulX + yMove * zMulY) / m_speedModifier; |
| m_axisZ->setRange(m_axisZ->min() + distance, m_axisZ->max() + distance); |
| break; |
| case StateDraggingY: |
| distance = move.y() / m_speedModifier; // No need to use adjusted y move here |
| m_axisY->setRange(m_axisY->min() + distance, m_axisY->max() + distance); |
| break; |
| default: |
| break; |
| } |
| //! [9] |
| } |