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50 | |
51 | #include "graph.h" |
52 | |
53 | #include "noisynode.h" |
54 | #include "gridnode.h" |
55 | #include "linenode.h" |
56 | |
57 | Graph::Graph() |
58 | : m_samplesChanged(false) |
59 | , m_geometryChanged(false) |
60 | { |
61 | setFlag(flag: ItemHasContents, enabled: true); |
62 | } |
63 | |
64 | |
65 | void Graph::appendSample(qreal value) |
66 | { |
67 | m_samples << value; |
68 | m_samplesChanged = true; |
69 | update(); |
70 | } |
71 | |
72 | |
73 | void Graph::removeFirstSample() |
74 | { |
75 | m_samples.removeFirst(); |
76 | m_samplesChanged = true; |
77 | update(); |
78 | } |
79 | |
80 | void Graph::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry) |
81 | { |
82 | m_geometryChanged = true; |
83 | update(); |
84 | QQuickItem::geometryChanged(newGeometry, oldGeometry); |
85 | } |
86 | |
87 | |
88 | class GraphNode : public QSGNode |
89 | { |
90 | public: |
91 | NoisyNode *background; |
92 | GridNode *grid; |
93 | LineNode *line; |
94 | LineNode *shadow; |
95 | }; |
96 | |
97 | |
98 | QSGNode *Graph::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *) |
99 | { |
100 | GraphNode *n= static_cast<GraphNode *>(oldNode); |
101 | |
102 | QRectF rect = boundingRect(); |
103 | |
104 | if (rect.isEmpty()) { |
105 | delete n; |
106 | return nullptr; |
107 | } |
108 | |
109 | if (!n) { |
110 | n = new GraphNode(); |
111 | |
112 | n->background = new NoisyNode(window()); |
113 | n->grid = new GridNode(); |
114 | n->line = new LineNode(10, 0.5, QColor("steelblue" )); |
115 | n->shadow = new LineNode(20, 0.2f, QColor::fromRgbF(r: 0.2, g: 0.2, b: 0.2, a: 0.4)); |
116 | |
117 | n->appendChildNode(node: n->background); |
118 | n->appendChildNode(node: n->grid); |
119 | n->appendChildNode(node: n->shadow); |
120 | n->appendChildNode(node: n->line); |
121 | } |
122 | |
123 | if (m_geometryChanged) { |
124 | n->background->setRect(rect); |
125 | n->grid->setRect(rect); |
126 | } |
127 | |
128 | if (m_geometryChanged || m_samplesChanged) { |
129 | n->line->updateGeometry(bounds: rect, samples: m_samples); |
130 | // We don't need to calculate the geometry twice, so just steal it from the other one... |
131 | n->shadow->setGeometry(n->line->geometry()); |
132 | } |
133 | |
134 | m_geometryChanged = false; |
135 | m_samplesChanged = false; |
136 | |
137 | return n; |
138 | } |
139 | |