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# scene.h Example File

demos/boxes/scene.h

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the demonstration applications of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:LGPL$
     ** Commercial License Usage
     ** Licensees holding valid commercial Qt licenses may use this file in
     ** accordance with the commercial license agreement provided with the
     ** Software or, alternatively, in accordance with the terms contained in
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     ** information use the contact form at http://www.qt.io/contact-us.
     **
     ** GNU Lesser General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU Lesser
     ** General Public License version 2.1 or version 3 as published by the Free
     ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
     ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
     ** following information to ensure the GNU Lesser General Public License
     ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
     ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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     ** rights. These rights are described in The Qt Company LGPL Exception
     ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
     **
     ** GNU General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License version 3.0 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.GPL included in the
     ** packaging of this file.  Please review the following information to
     ** ensure the GNU General Public License version 3.0 requirements will be
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     ** $QT_END_LICENSE$
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     ****************************************************************************/

     #ifndef SCENE_H
     #define SCENE_H

     //#include <GL/glew.h>
     #include "glextensions.h"

     #include <QtGui>
     #include <QtOpenGL>

     #include "roundedbox.h"
     #include "gltrianglemesh.h"
     #include "trackball.h"
     #include "glbuffers.h"
     #include "qtbox.h"

     #define PI 3.14159265358979

     class QMatrix4x4;

     class ParameterEdit : public QWidget
     {
     public:
         virtual void emitChange() = 0;
     };

     class ColorEdit : public ParameterEdit
     {
         Q_OBJECT
     public:
         ColorEdit(QRgb initialColor, int id);
         QRgb color() const {return m_color;}
         virtual void emitChange() {emit colorChanged(m_color, m_id);}
     public slots:
         void editDone();
     signals:
         void colorChanged(QRgb color, int id);
     protected:
         virtual void mousePressEvent(QMouseEvent *event);
         void setColor(QRgb color); // also emits colorChanged()
     private:
         QGraphicsScene *m_dialogParentScene;
         QLineEdit *m_lineEdit;
         QFrame *m_button;
         QRgb m_color;
         int m_id;
     };

     class FloatEdit : public ParameterEdit
     {
         Q_OBJECT
     public:
         FloatEdit(float initialValue, int id);
         float value() const {return m_value;}
         virtual void emitChange() {emit valueChanged(m_value, m_id);}
     public slots:
         void editDone();
     signals:
         void valueChanged(float value, int id);
     private:
         QGraphicsScene *m_dialogParentScene;
         QLineEdit *m_lineEdit;
         float m_value;
         int m_id;
     };

     class GraphicsWidget : public QGraphicsProxyWidget
     {
     public:
         GraphicsWidget() : QGraphicsProxyWidget(0, Qt::Window) {}
     protected:
         virtual QVariant itemChange(GraphicsItemChange change, const QVariant &value);
         virtual void resizeEvent(QGraphicsSceneResizeEvent *event);
         virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
     };

     class TwoSidedGraphicsWidget : public QObject
     {
         Q_OBJECT
     public:
         TwoSidedGraphicsWidget(QGraphicsScene *scene);
         void setWidget(int index, QWidget *widget);
         QWidget *widget(int index);
     public slots:
         void flip();
     protected slots:
         void animateFlip();
     private:
         GraphicsWidget *m_proxyWidgets[2];
         int m_current;
         int m_angle; // angle in degrees
         int m_delta;
     };

     class RenderOptionsDialog : public QDialog
     {
         Q_OBJECT
     public:
         RenderOptionsDialog();
         int addTexture(const QString &name);
         int addShader(const QString &name);
         void emitParameterChanged();
     protected slots:
         void setColorParameter(QRgb color, int id);
         void setFloatParameter(float value, int id);
     signals:
         void dynamicCubemapToggled(int);
         void colorParameterChanged(const QString &, QRgb);
         void floatParameterChanged(const QString &, float);
         void textureChanged(int);
         void shaderChanged(int);
         void doubleClicked();
     protected:
         virtual void mouseDoubleClickEvent(QMouseEvent *event);

         QVector<QByteArray> m_parameterNames;
         QComboBox *m_textureCombo;
         QComboBox *m_shaderCombo;
         QVector<ParameterEdit *> m_parameterEdits;
     };

     class ItemDialog : public QDialog
     {
         Q_OBJECT
     public:
         enum ItemType {
             QtBoxItem,
             CircleItem,
             SquareItem,
         };

         ItemDialog();
     public slots:
         void triggerNewQtBox();
         void triggerNewCircleItem();
         void triggerNewSquareItem();
     signals:
         void doubleClicked();
         void newItemTriggered(ItemDialog::ItemType type);
     protected:
         virtual void mouseDoubleClickEvent(QMouseEvent *event);
     };

     class Scene : public QGraphicsScene
     {
         Q_OBJECT
     public:
         Scene(int width, int height, int maxTextureSize);
         ~Scene();
         virtual void drawBackground(QPainter *painter, const QRectF &rect);

     public slots:
         void setShader(int index);
         void setTexture(int index);
         void toggleDynamicCubemap(int state);
         void setColorParameter(const QString &name, QRgb color);
         void setFloatParameter(const QString &name, float value);
         void newItem(ItemDialog::ItemType type);
     protected:
         void renderBoxes(const QMatrix4x4 &view, int excludeBox = -2);
         void setStates();
         void setLights();
         void defaultStates();
         void renderCubemaps();

         virtual void mousePressEvent(QGraphicsSceneMouseEvent *event);
         virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
         virtual void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
         virtual void wheelEvent(QGraphicsSceneWheelEvent * event);
     private:
         void initGL();
         QPointF pixelPosToViewPos(const QPointF& p);

         QTime m_time;
         int m_lastTime;
         int m_mouseEventTime;
         int m_distExp;
         int m_frame;
         int m_maxTextureSize;

         int m_currentShader;
         int m_currentTexture;
         bool m_dynamicCubemap;
         bool m_updateAllCubemaps;

         RenderOptionsDialog *m_renderOptions;
         ItemDialog *m_itemDialog;
         QTimer *m_timer;
         GLRoundedBox *m_box;
         TrackBall m_trackBalls[3];
         QVector<GLTexture *> m_textures;
         GLTextureCube *m_environment;
         GLTexture3D *m_noise;
         GLRenderTargetCube *m_mainCubemap;
         QVector<GLRenderTargetCube *> m_cubemaps;
         QVector<QGLShaderProgram *> m_programs;
         QGLShader *m_vertexShader;
         QVector<QGLShader *> m_fragmentShaders;
         QGLShader *m_environmentShader;
         QGLShaderProgram *m_environmentProgram;
     };

     #endif