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Diffstat (limited to 'examples/quick/scenegraph/graph/graph.cpp')
-rw-r--r-- | examples/quick/scenegraph/graph/graph.cpp | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/examples/quick/scenegraph/graph/graph.cpp b/examples/quick/scenegraph/graph/graph.cpp new file mode 100644 index 0000000000..ad75307e57 --- /dev/null +++ b/examples/quick/scenegraph/graph/graph.cpp @@ -0,0 +1,128 @@ +/**************************************************************************** +** +** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** You may use this file under the terms of the BSD license as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names +** of its contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "graph.h" + +#include "noisynode.h" +#include "gridnode.h" +#include "linenode.h" + +Graph::Graph() + : m_samplesChanged(false) + , m_geometryChanged(false) +{ + setFlag(ItemHasContents, true); +} + + +void Graph::appendSample(qreal value) +{ + m_samples << value; + m_samplesChanged = true; + update(); +} + + +void Graph::removeFirstSample() +{ + m_samples.removeFirst(); + m_samplesChanged = true; + update(); +} + +void Graph::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry) +{ + m_geometryChanged = true; + update(); + QQuickItem::geometryChanged(newGeometry, oldGeometry); +} + + +class GraphNode : public QSGNode +{ +public: + NoisyNode *background; + GridNode *grid; + LineNode *line; + LineNode *shadow; +}; + + +QSGNode *Graph::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *) +{ + GraphNode *n= static_cast<GraphNode *>(oldNode); + + QRectF rect = boundingRect(); + + if (rect.isEmpty()) { + delete n; + return 0; + } + + if (!n) { + n = new GraphNode(); + + n->background = new NoisyNode(window()); + n->grid = new GridNode(); + n->line = new LineNode(10, 0.5, QColor("steelblue")); + n->shadow = new LineNode(20, 0.2, QColor::fromRgbF(0.2, 0.2, 0.2, 0.4)); + + n->appendChildNode(n->background); + n->appendChildNode(n->grid); + n->appendChildNode(n->shadow); + n->appendChildNode(n->line); + } + + if (m_geometryChanged) { + n->background->setRect(rect); + n->grid->setRect(rect); + } + + if (m_geometryChanged || m_samplesChanged) { + n->line->updateGeometry(rect, m_samples); + // We don't need to calculate the geometry twice, so just steal it from the other one... + n->shadow->setGeometry(n->line->geometry()); + } + + m_geometryChanged = false; + m_samplesChanged = false; + + return n; +} |