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author | Gunnar Sletta <gunnar.sletta@nokia.com> | 2012-07-30 11:09:23 +0200 |
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committer | Qt by Nokia <qt-info@nokia.com> | 2012-08-13 15:06:46 +0200 |
commit | 3ddf7f1cf638091c8c7c7380bf0414dcc1145d2c (patch) | |
tree | 24ca7353ee789e5ea0ffa372eb899e6d2e93b9c3 /examples/quick/scenegraph/customgeometry/beziercurve.cpp | |
parent | 917a2cbc76a8433e550770b1414153ab16215381 (diff) |
Three scene graph examples with docs.
How to make a custom QSGGeometry, how to use QSGSimpleMaterial and how
to use render with raw GL.
Change-Id: I3e5a32b6ae12d7d781c11050ed26a54845e92cca
Reviewed-by: Gunnar Sletta <gunnar.sletta@nokia.com>
Diffstat (limited to 'examples/quick/scenegraph/customgeometry/beziercurve.cpp')
-rw-r--r-- | examples/quick/scenegraph/customgeometry/beziercurve.cpp | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/examples/quick/scenegraph/customgeometry/beziercurve.cpp b/examples/quick/scenegraph/customgeometry/beziercurve.cpp new file mode 100644 index 0000000000..dde24d09ef --- /dev/null +++ b/examples/quick/scenegraph/customgeometry/beziercurve.cpp @@ -0,0 +1,168 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the demonstration applications of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** This file may be used under the terms of the GNU Lesser General Public +** License version 2.1 as published by the Free Software Foundation and +** appearing in the file LICENSE.LGPL included in the packaging of this +** file. Please review the following information to ensure the GNU Lesser +** General Public License version 2.1 requirements will be met: +** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of this +** file. Please review the following information to ensure the GNU General +** Public License version 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "beziercurve.h" + +#include <QtQuick/qsgnode.h> +#include <QtQuick/qsgflatcolormaterial.h> + +//! [1] +BezierCurve::BezierCurve(QQuickItem *parent) + : QQuickItem(parent) + , m_p1(0, 0) + , m_p2(1, 0) + , m_p3(0, 1) + , m_p4(1, 1) + , m_segmentCount(32) +{ + setFlag(ItemHasContents, true); +} +//! [1] + +//! [2] +BezierCurve::~BezierCurve() +{ +} +//! [2] + +//! [3] +void BezierCurve::setP1(const QPointF &p) +{ + if (p == m_p1) + return; + + m_p1 = p; + emit p1Changed(p); + update(); +} +//! [3] + +void BezierCurve::setP2(const QPointF &p) +{ + if (p == m_p2) + return; + + m_p2 = p; + emit p2Changed(p); + update(); +} + +void BezierCurve::setP3(const QPointF &p) +{ + if (p == m_p3) + return; + + m_p3 = p; + emit p3Changed(p); + update(); +} + +void BezierCurve::setP4(const QPointF &p) +{ + if (p == m_p4) + return; + + m_p4 = p; + emit p4Changed(p); + update(); +} + +void BezierCurve::setSegmentCount(int count) +{ + if (m_segmentCount == count) + return; + + m_segmentCount = count; + emit segmentCountChanged(count); + update(); +} + +//! [4] +QSGNode *BezierCurve::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *) +{ + QSGGeometryNode *node = 0; + QSGGeometry *geometry = 0; + + if (!oldNode) { + node = new QSGGeometryNode; +//! [4] //! [5] + geometry = new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(), m_segmentCount); + geometry->setLineWidth(2); + geometry->setDrawingMode(GL_LINE_STRIP); + node->setGeometry(geometry); + node->setFlag(QSGNode::OwnsGeometry); +//! [5] //! [6] + QSGFlatColorMaterial *material = new QSGFlatColorMaterial; + material->setColor(QColor(255, 0, 0)); + node->setMaterial(material); + node->setFlag(QSGNode::OwnsMaterial); +//! [6] //! [7] + } else { + node = static_cast<QSGGeometryNode *>(oldNode); + geometry = node->geometry(); + geometry->allocate(m_segmentCount); + } +//! [7] + +//! [8] + QRectF bounds = boundingRect(); + QSGGeometry::Point2D *vertices = geometry->vertexDataAsPoint2D(); + for (int i = 0; i < m_segmentCount; ++i) { + qreal t = i / qreal(m_segmentCount - 1); + qreal invt = 1 - t; + + QPointF pos = invt * invt * invt * m_p1 + + 3 * invt * invt * t * m_p2 + + 3 * invt * t * t * m_p3 + + t * t * t * m_p4; + + float x = bounds.x() + pos.x() * bounds.width(); + float y = bounds.y() + pos.y() * bounds.height(); + + vertices[i].set(x, y); + } +//! [8] + +//! [9] + return node; +} +//! [9] + |