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/****************************************************************************
**
** 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 "volumetric.h"
#include <QtDataVisualization/qvalue3daxis.h>
#include <QtDataVisualization/q3dscene.h>
#include <QtDataVisualization/q3dcamera.h>
#include <QtDataVisualization/q3dtheme.h>
#include <QtCore/qmath.h>
#include <QtGui/QRgb>
#include <QtWidgets/QLabel>
#include <QtCore/QDebug>
using namespace QtDataVisualization;
const int textureSize = 256;
VolumetricModifier::VolumetricModifier(Q3DScatter *scatter)
: m_graph(scatter),
m_volumeItem(0),
m_sliceIndexX(textureSize / 2),
m_sliceIndexY(textureSize / 4),
m_sliceIndexZ(textureSize / 2)
{
m_graph->activeTheme()->setType(Q3DTheme::ThemeQt);
m_graph->setShadowQuality(QAbstract3DGraph::ShadowQualityNone);
m_graph->scene()->activeCamera()->setCameraPreset(Q3DCamera::CameraPresetFront);
m_graph->setOrthoProjection(true);
createVolume();
m_graph->addCustomItem(m_volumeItem);
m_graph->setMeasureFps(true);
QObject::connect(m_graph->scene()->activeCamera(), &Q3DCamera::zoomLevelChanged, this,
&VolumetricModifier::handleZoomLevelChange);
QObject::connect(m_graph, &QAbstract3DGraph::currentFpsChanged, this,
&VolumetricModifier::handleFpsChange);
}
VolumetricModifier::~VolumetricModifier()
{
delete m_graph;
}
void VolumetricModifier::setFpsLabel(QLabel *fpsLabel)
{
m_fpsLabel = fpsLabel;
}
void VolumetricModifier::sliceX(int enabled)
{
m_volumeItem->setSliceIndexX(enabled ? m_sliceIndexX : -1);
}
void VolumetricModifier::sliceY(int enabled)
{
m_volumeItem->setSliceIndexY(enabled ? m_sliceIndexY : -1);
}
void VolumetricModifier::sliceZ(int enabled)
{
m_volumeItem->setSliceIndexZ(enabled ? m_sliceIndexZ : -1);
}
void VolumetricModifier::adjustSliceX(int value)
{
m_sliceIndexX = value / (1024 / textureSize);
if (m_volumeItem->sliceIndexX() != -1)
m_volumeItem->setSliceIndexX(m_sliceIndexX);
}
void VolumetricModifier::adjustSliceY(int value)
{
m_sliceIndexY = value / (1024 / textureSize * 2);
if (m_volumeItem->sliceIndexY() != -1)
m_volumeItem->setSliceIndexY(m_sliceIndexY);
}
void VolumetricModifier::adjustSliceZ(int value)
{
m_sliceIndexZ = value / (1024 / textureSize);
if (m_volumeItem->sliceIndexZ() != -1)
m_volumeItem->setSliceIndexZ(m_sliceIndexZ);
}
void VolumetricModifier::handleZoomLevelChange()
{
// Zooming inside volumetric object causes ugly clipping issues, so restrict zoom level a bit
if (m_graph->scene()->activeCamera()->zoomLevel() > 200)
m_graph->scene()->activeCamera()->setZoomLevel(200);
}
void VolumetricModifier::handleFpsChange(qreal fps)
{
const QString fpsFormat = QStringLiteral("Fps: %1");
int fps10 = int(fps * 10.0);
m_fpsLabel->setText(fpsFormat.arg(QString::number(qreal(fps10) / 10.0)));
}
void VolumetricModifier::createVolume()
{
m_volumeItem = new QCustom3DVolume;
m_volumeItem->setScaling(QVector3D(2.0f, 1.0f, 2.0f));
m_volumeItem->setTextureWidth(textureSize);
m_volumeItem->setTextureHeight(textureSize / 2);
m_volumeItem->setTextureDepth(textureSize);
m_volumeItem->setTextureFormat(QImage::Format_Indexed8);
// Generate color table. First color is fully transparent used to fill outer
// portions of the volume. The second, red layer, is somewhat transparent.
// Rest of to colors are opaque.
QVector<QRgb> colors;
colors.resize(256);
colors[0] = qRgba(0, 0, 0, 0);
for (int i = 1; i < 256; i++) {
if (i < 60) {
colors[i] = qRgba((i * 2) + 120, 0, 0, 100);
} else if (i < 120) {
colors[i] = qRgba(0, ((i - 60) * 2) + 120, 0, 255);
} else if (i < 180) {
colors[i] = qRgba(0, 0, ((i - 120) * 2) + 120, 255);
} else {
colors[i] = qRgba(i, i, i, 255);
}
}
m_volumeItem->setColorTable(colors);
// Generate texture data for an half-ellipsoid.
// This can take a while if the dimensions are large.
// Note that in real world cases, the texture data is usually be supplied
// as a stack of slice images.
QVector<uchar> *textureData = new QVector<uchar>(textureSize * textureSize * textureSize / 2);
QVector3D midPoint(float(textureSize) / 2.0f,
float(textureSize) / 2.0f,
float(textureSize) / 2.0f);
int index = 0;
for (int i = 0; i < textureSize; i++) {
for (int j = 0; j < textureSize / 2; j++) {
for (int k = 0; k < textureSize; k++) {
int colorIndex = 0;
// Take a slice out of the ellipsoid
if (i >= textureSize / 2 || j >= textureSize / 4 || k >= textureSize / 2) {
QVector3D distVec = QVector3D(float(k), float(j * 2), float(i)) - midPoint;
float adjLen = qMin(255.0f, (distVec.length() * 512.0f / float(textureSize)));
if (adjLen < 230)
colorIndex = 255 - int(adjLen);
else
colorIndex = 0;
}
(*textureData)[index] = colorIndex;
index++;
}
}
}
m_volumeItem->setTextureData(textureData);
}
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