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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "datasource.h"
#include <QtCore/qmath.h>
#include <QtGui/QRgb>
#include <QtGui/QVector3D>
Q_DECLARE_METATYPE(QCustom3DVolume *)
DataSource::DataSource(QObject *parent) :
QObject(parent)
{
qRegisterMetaType<QCustom3DVolume *>();
}
DataSource::~DataSource()
{
}
void DataSource::fillVolume(QCustom3DVolume *volumeItem)
{
// Generate example texture data for an half-ellipsoid with a section missing.
// This can take a while if the dimensions are large, so we support incremental data generation.
int index = 0;
int textureSize = 256;
QVector3D midPoint(float(textureSize) / 2.0f,
float(textureSize) / 2.0f,
float(textureSize) / 2.0f);
QList<uchar> *textureData = new QList<uchar>(textureSize * textureSize * textureSize / 2);
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 section 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)));
colorIndex = 255 - int(adjLen);
}
(*textureData)[index] = colorIndex;
index++;
}
}
}
volumeItem->setScaling(QVector3D(2.0f, 1.0f, 2.0f));
volumeItem->setTextureWidth(textureSize);
volumeItem->setTextureHeight(textureSize / 2);
volumeItem->setTextureDepth(textureSize);
volumeItem->setTextureFormat(QImage::Format_Indexed8);
volumeItem->setTextureData(textureData);
QList<QRgb> colorTable(256);
for (int i = 1; i < 256; i++) {
if (i < 15)
colorTable[i] = qRgba(0, 0, 0, 0);
else if (i < 60)
colorTable[i] = qRgba((i * 2) + 120, 0, 0, 15);
else if (i < 120)
colorTable[i] = qRgba(0, ((i - 60) * 2) + 120, 0, 50);
else if (i < 180)
colorTable[i] = qRgba(0, 0, ((i - 120) * 2) + 120, 255);
else
colorTable[i] = qRgba(i, i, i, 255);
}
volumeItem->setColorTable(colorTable);
}
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