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| ** This file is part of the examples of the Qt Toolkit. |
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| |
| #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 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; |
| } |