Volumetric Rendering

 // Copyright (C) 2023 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

 #include "volumetric.h"

 #include <QtGui/qscreen.h>
 #include <QtWidgets/qapplication.h>
 #include <QtWidgets/qboxlayout.h>
 #include <QtWidgets/qcheckbox.h>
 #include <QtWidgets/qgroupbox.h>
 #include <QtWidgets/qlabel.h>
 #include <QtWidgets/qmessagebox.h>
 #include <QtWidgets/qradiobutton.h>
 #include <QtWidgets/qslider.h>
 #include <QtWidgets/qwidget.h>

 int main(int argc, char **argv)
 {
     QApplication app(argc, argv);
     Q3DScatter *graph = new Q3DScatter();

     QSize screenSize = graph->screen()->size();
     graph->setMinimumSize(QSize(screenSize.width() / 3, screenSize.height() / 2));
     graph->setMaximumSize(screenSize);
     graph->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
     graph->setFocusPolicy(Qt::StrongFocus);

     QWidget *widget = new QWidget();
     QHBoxLayout *hLayout = new QHBoxLayout(widget);
     QVBoxLayout *vLayout = new QVBoxLayout();
     QVBoxLayout *vLayout2 = new QVBoxLayout();
     hLayout->addWidget(graph, 1);
     hLayout->addLayout(vLayout);
     hLayout->addLayout(vLayout2);

     widget->setWindowTitle(QStringLiteral("Volumetric Rendering - 3D Terrain"));

     QCheckBox *sliceXCheckBox = new QCheckBox(widget);
     sliceXCheckBox->setText(QStringLiteral("Slice volume on X axis"));
     sliceXCheckBox->setChecked(false);
     QCheckBox *sliceYCheckBox = new QCheckBox(widget);
     sliceYCheckBox->setText(QStringLiteral("Slice volume on Y axis"));
     sliceYCheckBox->setChecked(false);
     QCheckBox *sliceZCheckBox = new QCheckBox(widget);
     sliceZCheckBox->setText(QStringLiteral("Slice volume on Z axis"));
     sliceZCheckBox->setChecked(false);

     QSlider *sliceXSlider = new QSlider(Qt::Horizontal, widget);
     sliceXSlider->setMinimum(0);
     sliceXSlider->setMaximum(1024);
     sliceXSlider->setValue(512);
     sliceXSlider->setEnabled(true);
     QSlider *sliceYSlider = new QSlider(Qt::Horizontal, widget);
     sliceYSlider->setMinimum(0);
     sliceYSlider->setMaximum(1024);
     sliceYSlider->setValue(512);
     sliceYSlider->setEnabled(true);
     QSlider *sliceZSlider = new QSlider(Qt::Horizontal, widget);
     sliceZSlider->setMinimum(0);
     sliceZSlider->setMaximum(1024);
     sliceZSlider->setValue(512);
     sliceZSlider->setEnabled(true);

     QCheckBox *fpsCheckBox = new QCheckBox(widget);
     fpsCheckBox->setText(QStringLiteral("Show FPS"));
     fpsCheckBox->setChecked(false);
     QLabel *fpsLabel = new QLabel(QStringLiteral(""), widget);

     QGroupBox *textureDetailGroupBox = new QGroupBox(QStringLiteral("Texture detail"));

     QRadioButton *lowDetailRB = new QRadioButton(widget);
     lowDetailRB->setText(QStringLiteral("Low (256x128x256)"));
     lowDetailRB->setChecked(true);

     QRadioButton *mediumDetailRB = new QRadioButton(widget);
     mediumDetailRB->setText(QStringLiteral("Generating..."));
     mediumDetailRB->setChecked(false);
     mediumDetailRB->setEnabled(false);

     QRadioButton *highDetailRB = new QRadioButton(widget);
     highDetailRB->setText(QStringLiteral("Generating..."));
     highDetailRB->setChecked(false);
     highDetailRB->setEnabled(false);

     QVBoxLayout *textureDetailVBox = new QVBoxLayout;
     textureDetailVBox->addWidget(lowDetailRB);
     textureDetailVBox->addWidget(mediumDetailRB);
     textureDetailVBox->addWidget(highDetailRB);
     textureDetailGroupBox->setLayout(textureDetailVBox);

     QGroupBox *areaGroupBox = new QGroupBox(QStringLiteral("Show area"));

     QRadioButton *areaAllRB = new QRadioButton(widget);
     areaAllRB->setText(QStringLiteral("Whole region"));
     areaAllRB->setChecked(true);

     QRadioButton *areaMineRB = new QRadioButton(widget);
     areaMineRB->setText(QStringLiteral("The mine"));
     areaMineRB->setChecked(false);

     QRadioButton *areaMountainRB = new QRadioButton(widget);
     areaMountainRB->setText(QStringLiteral("The mountain"));
     areaMountainRB->setChecked(false);

     QVBoxLayout *areaVBox = new QVBoxLayout;
     areaVBox->addWidget(areaAllRB);
     areaVBox->addWidget(areaMineRB);
     areaVBox->addWidget(areaMountainRB);
     areaGroupBox->setLayout(areaVBox);

     QCheckBox *colorTableCheckBox = new QCheckBox(widget);
     colorTableCheckBox->setText(QStringLiteral("Alternate color table"));
     colorTableCheckBox->setChecked(false);

     QLabel *sliceImageXLabel = new QLabel(widget);
     QLabel *sliceImageYLabel = new QLabel(widget);
     QLabel *sliceImageZLabel = new QLabel(widget);
     sliceImageXLabel->setMinimumSize(QSize(200, 100));
     sliceImageYLabel->setMinimumSize(QSize(200, 200));
     sliceImageZLabel->setMinimumSize(QSize(200, 100));
     sliceImageXLabel->setMaximumSize(QSize(200, 100));
     sliceImageYLabel->setMaximumSize(QSize(200, 200));
     sliceImageZLabel->setMaximumSize(QSize(200, 100));
     sliceImageXLabel->setFrameShape(QFrame::Box);
     sliceImageYLabel->setFrameShape(QFrame::Box);
     sliceImageZLabel->setFrameShape(QFrame::Box);
     sliceImageXLabel->setScaledContents(true);
     sliceImageYLabel->setScaledContents(true);
     sliceImageZLabel->setScaledContents(true);

     QSlider *alphaMultiplierSlider = new QSlider(Qt::Horizontal, widget);
     alphaMultiplierSlider->setMinimum(0);
     alphaMultiplierSlider->setMaximum(139);
     alphaMultiplierSlider->setValue(100);
     alphaMultiplierSlider->setEnabled(true);
     QLabel *alphaMultiplierLabel = new QLabel(QStringLiteral("Alpha multiplier: 1.0"));

     QCheckBox *preserveOpacityCheckBox = new QCheckBox(widget);
     preserveOpacityCheckBox->setText(QStringLiteral("Preserve opacity"));
     preserveOpacityCheckBox->setChecked(true);

     QCheckBox *transparentGroundCheckBox = new QCheckBox(widget);
     transparentGroundCheckBox->setText(QStringLiteral("Transparent ground"));
     transparentGroundCheckBox->setChecked(false);

     QCheckBox *useHighDefShaderCheckBox = new QCheckBox(widget);
     useHighDefShaderCheckBox->setText(QStringLiteral("Use HD shader"));
     useHighDefShaderCheckBox->setChecked(true);

     QCheckBox *usePerspectiveCamera = new QCheckBox(widget);
     usePerspectiveCamera->setText(QStringLiteral("Use perspective camera"));
     usePerspectiveCamera->setChecked(false);

     QLabel *performanceNoteLabel = new QLabel(
         QStringLiteral("Note: A high end graphics card is\nrecommended with the HD shader\nwhen "
                        "the volume contains a lot of\ntransparent areas."));
     performanceNoteLabel->setFrameShape(QFrame::Box);

     QCheckBox *drawSliceFramesCheckBox = new QCheckBox(widget);
     drawSliceFramesCheckBox->setText(QStringLiteral("Draw slice frames"));
     drawSliceFramesCheckBox->setChecked(false);

     vLayout->addWidget(sliceXCheckBox);
     vLayout->addWidget(sliceXSlider);
     vLayout->addWidget(sliceImageXLabel);
     vLayout->addWidget(sliceYCheckBox);
     vLayout->addWidget(sliceYSlider);
     vLayout->addWidget(sliceImageYLabel);
     vLayout->addWidget(sliceZCheckBox);
     vLayout->addWidget(sliceZSlider);
     vLayout->addWidget(sliceImageZLabel);
     vLayout->addWidget(drawSliceFramesCheckBox, 1, Qt::AlignTop);
     vLayout2->addWidget(fpsCheckBox);
     vLayout2->addWidget(fpsLabel);
     vLayout2->addWidget(textureDetailGroupBox);
     vLayout2->addWidget(areaGroupBox);
     vLayout2->addWidget(colorTableCheckBox);
     vLayout2->addWidget(alphaMultiplierLabel);
     vLayout2->addWidget(alphaMultiplierSlider);
     vLayout2->addWidget(preserveOpacityCheckBox);
     vLayout2->addWidget(transparentGroundCheckBox);
     vLayout2->addWidget(useHighDefShaderCheckBox);
     vLayout2->addWidget(usePerspectiveCamera);
     vLayout2->addWidget(performanceNoteLabel, 1, Qt::AlignTop);

     VolumetricModifier *modifier = new VolumetricModifier(graph);
     modifier->setFpsLabel(fpsLabel);
     modifier->setMediumDetailRB(mediumDetailRB);
     modifier->setHighDetailRB(highDetailRB);
     modifier->setSliceSliders(sliceXSlider, sliceYSlider, sliceZSlider);
     modifier->setSliceLabels(sliceImageXLabel, sliceImageYLabel, sliceImageZLabel);
     modifier->setAlphaMultiplierLabel(alphaMultiplierLabel);
     modifier->setTransparentGround(transparentGroundCheckBox->isChecked());

     QObject::connect(fpsCheckBox,
                      &QCheckBox::stateChanged,
                      modifier,
                      &VolumetricModifier::setFpsMeasurement);
     QObject::connect(sliceXCheckBox,
                      &QCheckBox::stateChanged,
                      modifier,
                      &VolumetricModifier::sliceX);
     QObject::connect(sliceYCheckBox,
                      &QCheckBox::stateChanged,
                      modifier,
                      &VolumetricModifier::sliceY);
     QObject::connect(sliceZCheckBox,
                      &QCheckBox::stateChanged,
                      modifier,
                      &VolumetricModifier::sliceZ);
     QObject::connect(sliceXSlider,
                      &QSlider::valueChanged,
                      modifier,
                      &VolumetricModifier::adjustSliceX);
     QObject::connect(sliceYSlider,
                      &QSlider::valueChanged,
                      modifier,
                      &VolumetricModifier::adjustSliceY);
     QObject::connect(sliceZSlider,
                      &QSlider::valueChanged,
                      modifier,
                      &VolumetricModifier::adjustSliceZ);
     QObject::connect(lowDetailRB,
                      &QRadioButton::toggled,
                      modifier,
                      &VolumetricModifier::toggleLowDetail);
     QObject::connect(mediumDetailRB,
                      &QRadioButton::toggled,
                      modifier,
                      &VolumetricModifier::toggleMediumDetail);
     QObject::connect(highDetailRB,
                      &QRadioButton::toggled,
                      modifier,
                      &VolumetricModifier::toggleHighDetail);
     QObject::connect(colorTableCheckBox,
                      &QCheckBox::stateChanged,
                      modifier,
                      &VolumetricModifier::changeColorTable);
     QObject::connect(preserveOpacityCheckBox,
                      &QCheckBox::stateChanged,
                      modifier,
                      &VolumetricModifier::setPreserveOpacity);
     QObject::connect(transparentGroundCheckBox,
                      &QCheckBox::stateChanged,
                      modifier,
                      &VolumetricModifier::setTransparentGround);
     QObject::connect(useHighDefShaderCheckBox,
                      &QCheckBox::stateChanged,
                      modifier,
                      &VolumetricModifier::setUseHighDefShader);
     QObject::connect(usePerspectiveCamera,
                      &QCheckBox::stateChanged,
                      modifier,
                      &VolumetricModifier::setUsePerspectiveCamera);
     QObject::connect(alphaMultiplierSlider,
                      &QSlider::valueChanged,
                      modifier,
                      &VolumetricModifier::adjustAlphaMultiplier);
     QObject::connect(areaAllRB,
                      &QRadioButton::toggled,
                      modifier,
                      &VolumetricModifier::toggleAreaAll);
     QObject::connect(areaMineRB,
                      &QRadioButton::toggled,
                      modifier,
                      &VolumetricModifier::toggleAreaMine);
     QObject::connect(areaMountainRB,
                      &QRadioButton::toggled,
                      modifier,
                      &VolumetricModifier::toggleAreaMountain);
     QObject::connect(drawSliceFramesCheckBox,
                      &QCheckBox::stateChanged,
                      modifier,
                      &VolumetricModifier::setDrawSliceFrames);

     widget->show();
     int retval = app.exec();
     delete modifier;
     return retval;
 }