Revision control
++ // Copyright (C) 2017 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #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::geometryChange(const QRectF &newGeometry, const QRectF &oldGeometry)
++ {
++ m_geometryChanged = true;
++ update();
++ QQuickItem::geometryChange(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 nullptr;
++ }
++
++ 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, 0.2f, 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;
++ }