diff options
Diffstat (limited to 'src/datavisualization/data/qheightmapsurfacedataproxy.cpp')
| -rw-r--r-- | src/datavisualization/data/qheightmapsurfacedataproxy.cpp | 489 |
1 files changed, 489 insertions, 0 deletions
diff --git a/src/datavisualization/data/qheightmapsurfacedataproxy.cpp b/src/datavisualization/data/qheightmapsurfacedataproxy.cpp new file mode 100644 index 00000000..518e69eb --- /dev/null +++ b/src/datavisualization/data/qheightmapsurfacedataproxy.cpp @@ -0,0 +1,489 @@ +/**************************************************************************** +** +** Copyright (C) 2013 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 "qheightmapsurfacedataproxy_p.h" + +QT_DATAVISUALIZATION_BEGIN_NAMESPACE + +// Default ranges correspond value axis defaults +const float defaultMinValue = 0.0f; +const float defaultMaxValue = 10.0f; + +/*! + * \class QHeightMapSurfaceDataProxy + * \inmodule QtDataVisualization + * \brief Base proxy class for Q3DSurface. + * \since 1.0.0 + * + * QHeightMapSurfaceDataProxy takes care of surface related height map data handling. It provides a + * way for giving the surface plot a height map to be visualized. + * + * Since height maps do not contain values for X or Z axes, those values need to be given + * separately using minXValue, maxXValue, minZValue, and maxZValue properties. X-value corresponds + * to image horizontal direction and Z-value to the vertical. Setting any of these + * properties triggers asynchronous re-resolving of any existing height map. + * + * \sa QSurfaceDataProxy, {Qt Data Visualization Data Handling} + */ + +/*! + * \qmltype HeightMapSurfaceDataProxy + * \inqmlmodule com.digia.QtDataVisualization 1.0 + * \since com.digia.QtDataVisualization 1.0 + * \ingroup datavisualization_qml + * \instantiates QHeightMapSurfaceDataProxy + * \inherits SurfaceDataProxy + * \brief Base proxy type for Surface3D. + * + * HeightMapSurfaceDataProxy takes care of surface related height map data handling. It provides a + * way for giving the surface plot a height map to be visualized. + * + * For more complete description, see QHeightMapSurfaceDataProxy. + * + * \sa {Qt Data Visualization Data Handling} + */ + +/*! + * \qmlproperty image HeightMapSurfaceDataProxy::heightMap + * + * A height map to be visualized. Setting this property replaces current data with height map data. + * + * There are several formats the image can be given in, but if it is not in a directly usable + * format, a conversion is made. \note If the result seems wrong, the automatic conversion failed + * and you should try converting the image yourself before setting it. Preferred format is + * QImage::Format_RGB32 in grayscale. + * + * The height of the image is read from the red component of the pixels if the image is in grayscale, + * otherwise it is an average calculated from red, green and blue components of the pixels. Using + * grayscale images may improve data conversion speed for large images. + * + * Since height maps do not contain values for X or Z axes, those values need to be given + * separately using minXValue, maxXValue, minZValue, and maxZValue properties. X-value corresponds + * to image horizontal direction and Z-value to the vertical. Setting any of these + * properties triggers asynchronous re-resolving of any existing height map. + * + * Not recommended formats: all mono formats (for example QImage::Format_Mono). + */ + +/*! + * \qmlproperty string HeightMapSurfaceDataProxy::heightMapFile + * + * A file with a height map image to be visualized. Setting this property replaces current data + * with height map data. + * + * \sa heightMap + */ + +/*! + * \qmlproperty qreal HeightMapSurfaceDataProxy::minXValue + * + * The minimum X value for the generated surface points. + * When setting this property the corresponding maximum value is adjusted if necessary, + * to ensure that the range remains valid. + */ + +/*! + * \qmlproperty qreal HeightMapSurfaceDataProxy::maxXValue + * + * The maximum X value for the generated surface points. + * When setting this property the corresponding minimum value is adjusted if necessary, + * to ensure that the range remains valid. + */ + +/*! + * \qmlproperty qreal HeightMapSurfaceDataProxy::minZValue + * + * The minimum Z value for the generated surface points. + * When setting this property the corresponding maximum value is adjusted if necessary, + * to ensure that the range remains valid. + */ + +/*! + * \qmlproperty qreal HeightMapSurfaceDataProxy::maxZValue + * + * The maximum Z value for the generated surface points. + * When setting this property the corresponding minimum value is adjusted if necessary, + * to ensure that the range remains valid. + */ + +/*! + * Constructs QHeightMapSurfaceDataProxy with the given \a parent. + */ +QHeightMapSurfaceDataProxy::QHeightMapSurfaceDataProxy(QObject *parent) : + QSurfaceDataProxy(new QHeightMapSurfaceDataProxyPrivate(this), parent) +{ +} + +/*! + * Constructs QHeightMapSurfaceDataProxy with the given \a image and \a parent. Height map is set + * by calling setHeighMap() with \a image. + * + * \sa heightMap + */ +QHeightMapSurfaceDataProxy::QHeightMapSurfaceDataProxy(const QImage &image, QObject *parent) : + QSurfaceDataProxy(new QHeightMapSurfaceDataProxyPrivate(this), parent) +{ + setHeightMap(image); +} + +/*! + * \internal + */ +QHeightMapSurfaceDataProxy::QHeightMapSurfaceDataProxy( + QHeightMapSurfaceDataProxyPrivate *d, QObject *parent) : + QSurfaceDataProxy(d, parent) +{ +} + +/*! + * Destroys QHeightMapSurfaceDataProxy. + */ +QHeightMapSurfaceDataProxy::~QHeightMapSurfaceDataProxy() +{ +} + +/*! + * \property QHeightMapSurfaceDataProxy::heightMap + * + * A height map to be visualized. Setting this property replaces current data with height map data. + * + * There are several formats the image can be given in, but if it is not in a directly usable + * format, a conversion is made. \note If the result seems wrong, the automatic conversion failed + * and you should try converting the image yourself before setting it. Preferred format is + * QImage::Format_RGB32 in grayscale. + * + * The height of the image is read from the red component of the pixels if the image is in grayscale, + * otherwise it is an average calculated from red, green and blue components of the pixels. Using + * grayscale images may improve data conversion speed for large images. + * + * Not recommended formats: all mono formats (for example QImage::Format_Mono). + * + * The height map is resolved asynchronously. QSurfaceDataProxy::arrayReset() is emitted when the + * data has been resolved. + */ +void QHeightMapSurfaceDataProxy::setHeightMap(const QImage &image) +{ + dptr()->m_heightMap = image; + + // We do resolving asynchronously to make qml onArrayReset handlers actually get the initial reset + if (!dptr()->m_resolveTimer.isActive()) + dptr()->m_resolveTimer.start(0); +} + +QImage QHeightMapSurfaceDataProxy::heightMap() const +{ + return dptrc()->m_heightMap; +} + +/*! + * \property QHeightMapSurfaceDataProxy::heightMapFile + * + * A file with a height map image to be visualized. Setting this property replaces current data + * with height map data. + * + * \sa heightMap + */ +void QHeightMapSurfaceDataProxy::setHeightMapFile(const QString &filename) +{ + dptr()->m_heightMapFile = filename; + setHeightMap(QImage(filename)); +} + +QString QHeightMapSurfaceDataProxy::heightMapFile() const +{ + return dptrc()->m_heightMapFile; +} + +/*! + * A convenience function for setting all minimum (\a minX and \a minZ) and maximum + * (\a maxX and \a maxZ) values at the same time. The minimum values must be smaller than the + * corresponding maximum value. Otherwise the values get adjusted so that they are valid. + */ +void QHeightMapSurfaceDataProxy::setValueRanges(float minX, float maxX, float minZ, float maxZ) +{ + dptr()->setValueRanges(minX, maxX, minZ, maxZ); +} + +/*! + * \property QHeightMapSurfaceDataProxy::minXValue + * + * The minimum X value for the generated surface points. + * When setting this property the corresponding maximum value is adjusted if necessary, + * to ensure that the range remains valid. + */ +void QHeightMapSurfaceDataProxy::setMinXValue(float min) +{ + dptr()->setMinXValue(min); +} + +float QHeightMapSurfaceDataProxy::minXValue() const +{ + return dptrc()->m_minXValue; +} + +/*! + * \property QHeightMapSurfaceDataProxy::maxXValue + * + * The maximum X value for the generated surface points. + * When setting this property the corresponding minimum value is adjusted if necessary, + * to ensure that the range remains valid. + */ +void QHeightMapSurfaceDataProxy::setMaxXValue(float max) +{ + dptr()->setMaxXValue(max); +} + +float QHeightMapSurfaceDataProxy::maxXValue() const +{ + return dptrc()->m_maxXValue; +} + +/*! + * \property QHeightMapSurfaceDataProxy::minZValue + * + * The minimum Z value for the generated surface points. + * When setting this property the corresponding maximum value is adjusted if necessary, + * to ensure that the range remains valid. + */ +void QHeightMapSurfaceDataProxy::setMinZValue(float min) +{ + dptr()->setMinZValue(min); +} + +float QHeightMapSurfaceDataProxy::minZValue() const +{ + return dptrc()->m_minZValue; +} + +/*! + * \property QHeightMapSurfaceDataProxy::maxZValue + * + * The maximum Z value for the generated surface points. + * When setting this property the corresponding minimum value is adjusted if necessary, + * to ensure that the range remains valid. + */ +void QHeightMapSurfaceDataProxy::setMaxZValue(float max) +{ + dptr()->setMaxZValue(max); +} + +float QHeightMapSurfaceDataProxy::maxZValue() const +{ + return dptrc()->m_maxZValue; +} + +/*! + * \internal + */ +QHeightMapSurfaceDataProxyPrivate *QHeightMapSurfaceDataProxy::dptr() +{ + return static_cast<QHeightMapSurfaceDataProxyPrivate *>(d_ptr.data()); +} + +/*! + * \internal + */ +const QHeightMapSurfaceDataProxyPrivate *QHeightMapSurfaceDataProxy::dptrc() const +{ + return static_cast<const QHeightMapSurfaceDataProxyPrivate *>(d_ptr.data()); +} + +// +// QHeightMapSurfaceDataProxyPrivate +// + +QHeightMapSurfaceDataProxyPrivate::QHeightMapSurfaceDataProxyPrivate(QHeightMapSurfaceDataProxy *q) + : QSurfaceDataProxyPrivate(q), + m_minXValue(defaultMinValue), + m_maxXValue(defaultMaxValue), + m_minZValue(defaultMinValue), + m_maxZValue(defaultMaxValue) +{ + m_resolveTimer.setSingleShot(true); + QObject::connect(&m_resolveTimer, &QTimer::timeout, + this, &QHeightMapSurfaceDataProxyPrivate::handlePendingResolve); +} + +QHeightMapSurfaceDataProxyPrivate::~QHeightMapSurfaceDataProxyPrivate() +{ +} + +QHeightMapSurfaceDataProxy *QHeightMapSurfaceDataProxyPrivate::qptr() +{ + return static_cast<QHeightMapSurfaceDataProxy *>(q_ptr); +} + +void QHeightMapSurfaceDataProxyPrivate::setValueRanges(float minX, float maxX, float minZ, float maxZ) +{ + bool changed = false; + if (m_minXValue != minX || m_minZValue != minZ) { + m_minXValue = minX; + m_minZValue = minZ; + changed = true; + } + if (m_maxXValue != maxX || minX >= maxX) { + if (minX >= maxX) { + m_maxXValue = minX + 1.0; + qWarning() << "Warning: Tried to set invalid range for X value range." + " Range automatically adjusted to a valid one:" + << minX << "-" << maxX << "-->" << m_minXValue << "-" << m_maxXValue; + } else { + m_maxXValue = maxX; + } + changed = true; + } + if (m_maxZValue != maxZ || minZ >= maxZ) { + if (minZ >= maxZ) { + m_maxZValue = minZ + 1.0; + qWarning() << "Warning: Tried to set invalid range for Z value range." + " Range automatically adjusted to a valid one:" + << minZ << "-" << maxZ << "-->" << m_minZValue << "-" << m_maxZValue; + } else { + m_maxZValue = maxZ; + } + changed = true; + } + + if (changed && !m_resolveTimer.isActive()) + m_resolveTimer.start(0); +} + +void QHeightMapSurfaceDataProxyPrivate::setMinXValue(float min) +{ + if (min != m_minXValue) { + if (min >= m_maxXValue) { + qreal oldMax = m_maxXValue; + m_maxXValue = min + 1.0; + qWarning() << "Warning: Tried to set minimum X to equal or larger than maximum X for" + " value range. Maximum automatically adjusted to a valid one:" + << oldMax << "-->" << m_maxXValue; + } + m_minXValue = min; + + if (!m_resolveTimer.isActive()) + m_resolveTimer.start(0); + } +} + +void QHeightMapSurfaceDataProxyPrivate::setMaxXValue(float max) +{ + if (m_maxXValue != max) { + if (max <= m_minXValue) { + qreal oldMin = m_minXValue; + m_minXValue = max - 1.0; + qWarning() << "Warning: Tried to set maximum X to equal or smaller than minimum X for" + " value range. Minimum automatically adjusted to a valid one:" + << oldMin << "-->" << m_minXValue; + } + m_maxXValue = max; + + if (!m_resolveTimer.isActive()) + m_resolveTimer.start(0); + } +} + +void QHeightMapSurfaceDataProxyPrivate::setMinZValue(float min) +{ + if (min != m_minZValue) { + if (min >= m_maxZValue) { + qreal oldMax = m_maxZValue; + m_maxZValue = min + 1.0; + qWarning() << "Warning: Tried to set minimum Z to equal or larger than maximum Z for" + " value range. Maximum automatically adjusted to a valid one:" + << oldMax << "-->" << m_maxZValue; + } + m_minZValue = min; + + if (!m_resolveTimer.isActive()) + m_resolveTimer.start(0); + } +} + +void QHeightMapSurfaceDataProxyPrivate::setMaxZValue(float max) +{ + if (m_maxZValue != max) { + if (max <= m_minZValue) { + qreal oldMin = m_minZValue; + m_minZValue = max - 1.0; + qWarning() << "Warning: Tried to set maximum Z to equal or smaller than minimum Z for" + " value range. Minimum automatically adjusted to a valid one:" + << oldMin << "-->" << m_minZValue; + } + m_maxZValue = max; + + if (!m_resolveTimer.isActive()) + m_resolveTimer.start(0); + } +} + +void QHeightMapSurfaceDataProxyPrivate::handlePendingResolve() +{ + QImage heightImage = m_heightMap; + // Convert to RGB32 to be sure we're reading the right bytes + if (heightImage.format() != QImage::Format_RGB32) + heightImage = heightImage.convertToFormat(QImage::Format_RGB32); + + uchar *bits = heightImage.bits(); + + int imageHeight = heightImage.height(); + int imageWidth = heightImage.width(); + int bitCount = imageWidth * 4 * (imageHeight - 1); + int widthBits = imageWidth * 4; + float height = 0; + + // Do not recreate array if dimensions have not changed + QSurfaceDataArray *dataArray = m_dataArray; + if (imageWidth != qptr()->columnCount() || imageHeight != dataArray->size()) { + dataArray = new QSurfaceDataArray; + dataArray->reserve(imageHeight); + for (int i = 0; i < imageHeight; i++) { + QSurfaceDataRow *newProxyRow = new QSurfaceDataRow(imageWidth); + dataArray->append(newProxyRow); + } + } + + float xMul = (m_maxXValue - m_minXValue) / float(imageWidth - 1); + float zMul = (m_maxZValue - m_minZValue) / float(imageHeight - 1); + + if (heightImage.isGrayscale()) { + // Grayscale, it's enough to read Red byte + for (int i = 0; i < imageHeight; i++, bitCount -= widthBits) { + QSurfaceDataRow &newRow = *dataArray->at(i); + for (int j = 0; j < imageWidth; j++) + newRow[j].setPosition(QVector3D((float(j) * xMul) + m_minXValue, float(bits[bitCount + (j * 4)]), + (float(i) * zMul) + m_minZValue)); + } + } else { + // Not grayscale, we'll need to calculate height from RGB + for (int i = 0; i < imageHeight; i++, bitCount -= widthBits) { + QSurfaceDataRow &newRow = *dataArray->at(i); + for (int j = 0; j < imageWidth; j++) { + int nextpixel = j * 4; + height = (float(bits[bitCount + nextpixel]) + + float(bits[1 + bitCount + nextpixel]) + + float(bits[2 + bitCount + nextpixel])); + newRow[j].setPosition(QVector3D((float(j) * xMul) + m_minXValue, height / 3.0f, + (float(i) * zMul) + m_minZValue)); + } + } + } + + qptr()->resetArray(dataArray); +} + +QT_DATAVISUALIZATION_END_NAMESPACE |