92 lines
1.9 KiB
C++
92 lines
1.9 KiB
C++
// Copyright (C) 2017 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include "graph.h"
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#include "noisynode.h"
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#include "gridnode.h"
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#include "linenode.h"
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Graph::Graph()
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: m_samplesChanged(false)
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, m_geometryChanged(false)
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{
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setFlag(ItemHasContents, true);
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}
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void Graph::appendSample(qreal value)
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{
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m_samples << value;
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m_samplesChanged = true;
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update();
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}
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void Graph::removeFirstSample()
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{
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m_samples.removeFirst();
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m_samplesChanged = true;
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update();
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}
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void Graph::geometryChange(const QRectF &newGeometry, const QRectF &oldGeometry)
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{
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m_geometryChanged = true;
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update();
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QQuickItem::geometryChange(newGeometry, oldGeometry);
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}
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class GraphNode : public QSGNode
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{
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public:
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NoisyNode *background;
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GridNode *grid;
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LineNode *line;
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LineNode *shadow;
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};
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QSGNode *Graph::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *)
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{
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GraphNode *n= static_cast<GraphNode *>(oldNode);
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QRectF rect = boundingRect();
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if (rect.isEmpty()) {
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delete n;
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return nullptr;
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}
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if (!n) {
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n = new GraphNode();
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n->background = new NoisyNode(window());
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n->grid = new GridNode();
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n->line = new LineNode(10, 0.5, QColor("steelblue"));
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n->shadow = new LineNode(20, 0.2f, QColor::fromRgbF(0.2, 0.2, 0.2, 0.4));
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n->appendChildNode(n->background);
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n->appendChildNode(n->grid);
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n->appendChildNode(n->shadow);
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n->appendChildNode(n->line);
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}
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if (m_geometryChanged) {
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n->background->setRect(rect);
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n->grid->setRect(rect);
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}
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if (m_geometryChanged || m_samplesChanged) {
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n->line->updateGeometry(rect, m_samples);
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// We don't need to calculate the geometry twice, so just steal it from the other one...
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n->shadow->setGeometry(n->line->geometry());
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}
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m_geometryChanged = false;
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m_samplesChanged = false;
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return n;
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}
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