diff options
| author | Miikka Heikkinen <miikka.heikkinen@digia.com> | 2014-02-10 12:01:35 +0200 |
|---|---|---|
| committer | Miikka Heikkinen <miikka.heikkinen@digia.com> | 2014-02-11 07:51:34 +0200 |
| commit | b86e535d839643298ba610da9789e9c4bc9149db (patch) | |
| tree | affb34cf301618eb5c869a5bef2b48ab4229ffb1 /examples | |
| parent | 51ad2b7e532296fde314e8157475b667b18ae82a (diff) | |
Add rotations example
+Fix scatter rangegradient
Task-number: QTRD-2801
Change-Id: I1515b0a500cd995471b3de1e0b5356099bc19ede
Reviewed-by: Tomi Korpipää <tomi.korpipaa@digia.com>
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@digia.com>
Diffstat (limited to 'examples')
| -rw-r--r-- | examples/examples.pro | 3 | ||||
| -rw-r--r-- | examples/rotations/doc/src/rotations.qdoc | 68 | ||||
| -rw-r--r-- | examples/rotations/main.cpp | 87 | ||||
| -rw-r--r-- | examples/rotations/mesh/largesphere.obj | 1938 | ||||
| -rw-r--r-- | examples/rotations/mesh/narrowarrow.obj | 413 | ||||
| -rw-r--r-- | examples/rotations/rotations.pro | 15 | ||||
| -rw-r--r-- | examples/rotations/rotations.qrc | 6 | ||||
| -rw-r--r-- | examples/rotations/scatterdatamodifier.cpp | 183 | ||||
| -rw-r--r-- | examples/rotations/scatterdatamodifier.h | 56 |
9 files changed, 2768 insertions, 1 deletions
diff --git a/examples/examples.pro b/examples/examples.pro index 9c3b5704..5ca239d5 100644 --- a/examples/examples.pro +++ b/examples/examples.pro @@ -13,7 +13,8 @@ SUBDIRS += qmlbars \ customproxy \ itemmodel \ scatter \ - surface + surface \ + rotations } qtHaveModule(multimedia):!android:!ios: SUBDIRS += audiolevels diff --git a/examples/rotations/doc/src/rotations.qdoc b/examples/rotations/doc/src/rotations.qdoc new file mode 100644 index 00000000..2de29195 --- /dev/null +++ b/examples/rotations/doc/src/rotations.qdoc @@ -0,0 +1,68 @@ +/**************************************************************************** +** +** 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 +** +****************************************************************************/ + +/*! + \example rotations + \title Rotations Example + \ingroup qtdatavisualization_examples + \brief Using rotated scatter items + + This example shows how to do the following: + + \list + \li Use item rotations + \li Use custom item meshes + \li Use range gradient to color the series + \endlist + + For more basic example about using Qt Data Visualization graphs, see \l{Bars Example}. + + \image rotations-example.png + + \section1 Using rotations + + In this example we want to orient the arrow items tangentially to the origin. This requires + rotating them, which can be achieved by specifying rotation quaternion to each item: + + \snippet ../examples/rotations/scatterdatamodifier.cpp 0 + \snippet ../examples/rotations/scatterdatamodifier.cpp 1 + \snippet ../examples/rotations/scatterdatamodifier.cpp 2 + + Since the items need to be rotated along two axes, we define two rotation quaternions, one + for Y-axis and one for Z-axis, and then multiply these together to get the total rotation, + which we set to the data item. + + \section1 Using custom item meshes + + The narrow arrow mesh we use for magnetic field arrow items is not a standard mesh. Instead + we supply our own \c{narrowarrow.obj} file which contains the object definition for the mesh + in \c Wavefront obj format: + + \snippet ../examples/rotations/scatterdatamodifier.cpp 3 + + \section1 Using range gradient + + Setting the color style to range gradient in a series means that the item is colored according + to its relative Y-value on the visible Y-coordinate range. We want the arrows on the bottom + part of the graph to be darker and gradually get lighter higher they are, so we define a + range gradient with black color at the position 0.0 and white color at the position 1.0: + + \snippet ../examples/rotations/scatterdatamodifier.cpp 4 + + \section1 Example contents +*/ diff --git a/examples/rotations/main.cpp b/examples/rotations/main.cpp new file mode 100644 index 00000000..3ddb7b55 --- /dev/null +++ b/examples/rotations/main.cpp @@ -0,0 +1,87 @@ +/**************************************************************************** +** +** 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 "scatterdatamodifier.h" + +#include <QApplication> +#include <QWidget> +#include <QHBoxLayout> +#include <QVBoxLayout> +#include <QPushButton> +#include <QScreen> +#include <QSlider> +#include <QLabel> + +int main(int argc, char **argv) +{ + QApplication app(argc, argv); + Q3DScatter *graph = new Q3DScatter(); + QWidget *container = QWidget::createWindowContainer(graph); + + QSize screenSize = graph->screen()->size(); + container->setMinimumSize(QSize(screenSize.width() / 2, screenSize.height() / 1.5)); + container->setMaximumSize(screenSize); + container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding); + container->setFocusPolicy(Qt::StrongFocus); + + QWidget *widget = new QWidget; + QHBoxLayout *hLayout = new QHBoxLayout(widget); + QVBoxLayout *vLayout = new QVBoxLayout(); + hLayout->addWidget(container, 1); + hLayout->addLayout(vLayout); + + widget->setWindowTitle(QStringLiteral("Item rotations example - Magnetic field of the sun")); + + QPushButton *toggleRotationButton = new QPushButton(widget); + toggleRotationButton->setText(QStringLiteral("Toggle animation")); + QPushButton *toggleSunButton = new QPushButton(widget); + toggleSunButton->setText(QStringLiteral("Toggle Sun")); + + QSlider *fieldLinesSlider = new QSlider(Qt::Horizontal, widget); + fieldLinesSlider->setTickInterval(1); + fieldLinesSlider->setMinimum(1); + fieldLinesSlider->setValue(12); + fieldLinesSlider->setMaximum(128); + + QSlider *arrowsSlider = new QSlider(Qt::Horizontal, widget); + arrowsSlider->setTickInterval(1); + arrowsSlider->setMinimum(8); + arrowsSlider->setValue(16); + arrowsSlider->setMaximum(32); + + vLayout->addWidget(toggleRotationButton); + vLayout->addWidget(toggleSunButton); + vLayout->addWidget(new QLabel(QStringLiteral("Field Lines (1 - 128):"))); + vLayout->addWidget(fieldLinesSlider); + vLayout->addWidget(new QLabel(QStringLiteral("Arrows per line (8 - 32):"))); + vLayout->addWidget(arrowsSlider, 1, Qt::AlignTop); + + ScatterDataModifier *modifier = new ScatterDataModifier(graph); + + QObject::connect(toggleRotationButton, &QPushButton::clicked, modifier, + &ScatterDataModifier::toggleRotation); + QObject::connect(toggleSunButton, &QPushButton::clicked, modifier, + &ScatterDataModifier::toggleSun); + QObject::connect(fieldLinesSlider, &QSlider::valueChanged, modifier, + &ScatterDataModifier::setFieldLines); + QObject::connect(arrowsSlider, &QSlider::valueChanged, modifier, + &ScatterDataModifier::setArrowsPerLine); + + widget->show(); + return app.exec(); +} diff --git a/examples/rotations/mesh/largesphere.obj b/examples/rotations/mesh/largesphere.obj new file mode 100644 index 00000000..63101413 --- /dev/null +++ b/examples/rotations/mesh/largesphere.obj @@ -0,0 +1,1938 @@ +# 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+OTHER_FILES += doc/src/* \ + doc/images/* diff --git a/examples/rotations/rotations.qrc b/examples/rotations/rotations.qrc new file mode 100644 index 00000000..bf66ebeb --- /dev/null +++ b/examples/rotations/rotations.qrc @@ -0,0 +1,6 @@ +<RCC> + <qresource prefix="/"> + <file>mesh/narrowarrow.obj</file> + <file>mesh/largesphere.obj</file> + </qresource> +</RCC> diff --git a/examples/rotations/scatterdatamodifier.cpp b/examples/rotations/scatterdatamodifier.cpp new file mode 100644 index 00000000..d916ffbd --- /dev/null +++ b/examples/rotations/scatterdatamodifier.cpp @@ -0,0 +1,183 @@ +/**************************************************************************** +** +** 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 "scatterdatamodifier.h" +#include <QtDataVisualization/qscatterdataproxy.h> +#include <QtDataVisualization/qvalue3daxis.h> +#include <QtDataVisualization/q3dscene.h> +#include <QtDataVisualization/q3dcamera.h> +#include <QtDataVisualization/qscatter3dseries.h> +#include <QtDataVisualization/q3dtheme.h> +#include <qmath.h> + +using namespace QtDataVisualization; + +static const float verticalRange = 8.0f; +static const float horizontalRange = verticalRange; +static const float ellipse_a = horizontalRange / 3.0f; +static const float ellipse_b = verticalRange; +static const float doublePi = float(M_PI) * 2.0f; +static const float radiansToDegrees = 360.0f / doublePi; +static const float animationFrames = 30.0f; + +ScatterDataModifier::ScatterDataModifier(Q3DScatter *scatter) + : m_graph(scatter), + m_fieldLines(12), + m_arrowsPerLine(16), + m_magneticField(new QScatter3DSeries), + m_sun(new QScatter3DSeries), + m_magneticFieldArray(0), + m_angleOffset(0.0f), + m_angleStep(doublePi / m_arrowsPerLine / animationFrames) +{ + m_graph->setShadowQuality(QAbstract3DGraph::ShadowQualityNone); + m_graph->scene()->activeCamera()->setCameraPreset(Q3DCamera::CameraPresetFront); + + // Magnetic field lines use custom narrow arrow + m_magneticField->setItemSize(0.2f); + //! [3] + m_magneticField->setMesh(QAbstract3DSeries::MeshUserDefined); + m_magneticField->setUserDefinedMesh(QStringLiteral(":/mesh/narrowarrow.obj")); + //! [3] + //! [4] + QLinearGradient fieldGradient(0, 0, 16, 1024); + fieldGradient.setColorAt(0.0, Qt::black); + fieldGradient.setColorAt(1.0, Qt::white); + m_magneticField->setBaseGradient(fieldGradient); + m_magneticField->setColorStyle(Q3DTheme::ColorStyleRangeGradient); + //! [4] + + // For 'sun' we use a custom large sphere. + m_sun->setItemSize(0.2f); + m_sun->setName(QStringLiteral("Sun")); + m_sun->setItemLabelFormat(QStringLiteral("@seriesName")); + m_sun->setMesh(QAbstract3DSeries::MeshUserDefined); + m_sun->setUserDefinedMesh(QStringLiteral(":/mesh/largesphere.obj")); + m_sun->setBaseColor(QColor(0xff, 0xBB, 0x00)); + m_sun->dataProxy()->addItem(QScatterDataItem(QVector3D())); + + m_graph->addSeries(m_magneticField); + m_graph->addSeries(m_sun); + + // Configure the axes according to the data + m_graph->axisX()->setRange(-horizontalRange, horizontalRange); + m_graph->axisY()->setRange(-verticalRange, verticalRange); + m_graph->axisZ()->setRange(-horizontalRange, horizontalRange); + m_graph->axisX()->setSegmentCount(int(horizontalRange)); + m_graph->axisZ()->setSegmentCount(int(horizontalRange)); + + QObject::connect(&m_rotationTimer, &QTimer::timeout, this, + &ScatterDataModifier::triggerRotation); + + toggleRotation(); + generateData(); +} + +ScatterDataModifier::~ScatterDataModifier() +{ + delete m_graph; +} + +void ScatterDataModifier::generateData() +{ + // Reusing existing array is computationally cheaper than always generating new array, even if + // all data items change in the array, if the array size doesn't change. + if (!m_magneticFieldArray) + m_magneticFieldArray = new QScatterDataArray; + + int arraySize = m_fieldLines * m_arrowsPerLine; + if (arraySize != m_magneticFieldArray->size()) + m_magneticFieldArray->resize(arraySize); + + QScatterDataItem *ptrToDataArray = &m_magneticFieldArray->first(); + + for (float i = 0; i < m_fieldLines; i++) { + float horizontalAngle = (doublePi * i) / m_fieldLines; + float xCenter = ellipse_a * qCos(horizontalAngle); + float zCenter = ellipse_a * qSin(horizontalAngle); + + // Rotate - arrow always tangential to origo + //! [0] + QQuaternion yRotation = QQuaternion::fromAxisAndAngle(0.0f, 1.0f, 0.0f, horizontalAngle * radiansToDegrees); + //! [0] + + for (float j = 0; j < m_arrowsPerLine; j++) { + // Calculate point on ellipse centered on origo and parallel to x-axis + float verticalAngle = ((doublePi * j) / m_arrowsPerLine) + m_angleOffset; + float xUnrotated = ellipse_a * qCos(verticalAngle); + float y = ellipse_b * qSin(verticalAngle); + + // Rotate the ellipse around y-axis + float xRotated = xUnrotated * qCos(horizontalAngle); + float zRotated = xUnrotated * qSin(horizontalAngle); + + // Add offset + float x = xCenter + xRotated; + float z = zCenter + zRotated; + + //! [1] + QQuaternion zRotation = QQuaternion::fromAxisAndAngle(0.0f, 0.0f, 1.0f, verticalAngle * radiansToDegrees); + QQuaternion totalRotation = yRotation * zRotation; + //! [1] + + ptrToDataArray->setPosition(QVector3D(x, y, z)); + //! [2] + ptrToDataArray->setRotation(totalRotation); + //! [2] + ptrToDataArray++; + } + } + + if (m_graph->selectedSeries() == m_magneticField) + m_graph->clearSelection(); + + m_magneticField->dataProxy()->resetArray(m_magneticFieldArray); +} + +void ScatterDataModifier::setFieldLines(int lines) +{ + m_fieldLines = lines; + generateData(); +} + +void ScatterDataModifier::setArrowsPerLine(int arrows) +{ + m_angleOffset = 0.0f; + m_angleStep = doublePi / m_arrowsPerLine / animationFrames; + m_arrowsPerLine = arrows; + generateData(); +} + +void ScatterDataModifier::triggerRotation() +{ + m_angleOffset += m_angleStep; + generateData(); +} + +void ScatterDataModifier::toggleSun() +{ + m_sun->setVisible(!m_graph->seriesList().at(1)->isVisible()); +} + +void ScatterDataModifier::toggleRotation() +{ + if (m_rotationTimer.isActive()) + m_rotationTimer.stop(); + else + m_rotationTimer.start(15); +} diff --git a/examples/rotations/scatterdatamodifier.h b/examples/rotations/scatterdatamodifier.h new file mode 100644 index 00000000..9df1f26a --- /dev/null +++ b/examples/rotations/scatterdatamodifier.h @@ -0,0 +1,56 @@ +/**************************************************************************** +** +** 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 +** +****************************************************************************/ + +#ifndef SCATTERDATAMODIFIER_H +#define SCATTERDATAMODIFIER_H + +#include <QtDataVisualization/q3dscatter.h> +#include <QtDataVisualization/qscatterdataproxy.h> +#include <QtCore/QTimer> + +using namespace QtDataVisualization; + +class ScatterDataModifier : public QObject +{ + Q_OBJECT +public: + explicit ScatterDataModifier(Q3DScatter *scatter); + ~ScatterDataModifier(); + + void generateData(); + +public slots: + void setFieldLines(int lines); + void setArrowsPerLine(int arrows); + void toggleRotation(); + void triggerRotation(); + void toggleSun(); + +private: + Q3DScatter *m_graph; + QTimer m_rotationTimer; + int m_fieldLines; + int m_arrowsPerLine; + QScatter3DSeries *m_magneticField; + QScatter3DSeries *m_sun; + QScatterDataArray *m_magneticFieldArray; + float m_angleOffset; + float m_angleStep; +}; + +#endif |