1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
#include "barchart.h"
#include <algorithm>
#include "geometry.h"
static const QColor OUTLINE_COLOR(0, 0, 0);
static const QColor BAR_COLOR(128, 128, 128);
static const float DEFAULT_OPACITY = 0.8f;
BarChart::BarChart(QQuickItem *parent)
: QQuickItem(parent)
, m_shouldUpdateBars(false)
, m_colorScale(0)
, m_scale(0, 1, 0, 1)
{
setClip(true);
setFlag(QQuickItem::ItemHasContents);
// setAcceptedMouseButtons(Qt::LeftButton);
// setAcceptHoverEvents(true);
}
BarChart::~BarChart()
{
}
void BarChart::setValues(const arma::vec &values)
{
m_values = values;
m_originalIndices.resize(m_values.n_elem);
if (m_values.n_elem > 0) {
m_scale.setDomain(m_values.min(), m_values.max());
for (int i = 0; i < m_originalIndices.size(); i++) {
m_originalIndices[i] = i;
}
std::sort(m_originalIndices.begin(), m_originalIndices.end(),
[this](int i, int j) { return m_values[i] > m_values[j]; });
}
emit valuesChanged(values);
m_shouldUpdateBars = true;
}
void BarChart::setColorScale(const ColorScale *scale)
{
m_colorScale = scale;
emit colorScaleChanged(m_colorScale);
m_shouldUpdateBars = true;
update();
}
QSGNode *BarChart::newSceneGraph() const
{
QSGTransformNode *root = new QSGTransformNode;
return root;
}
QSGNode *BarChart::newBarNode() const
{
// A bar node is:
// opacityNode [outlineGeomNode barGeomNode]
//QSGGeometryNode *outlineGeomNode = new QSGGeometryNode;
//QSGGeometry *outlineGeometry =
// new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(), 4);
//outlineGeometry->setDrawingMode(GL_LINE_LOOP);
//outlineGeomNode->setGeometry(outlineGeometry);
//outlineGeomNode->setFlag(QSGNode::OwnsGeometry);
//QSGFlatColorMaterial *material = new QSGFlatColorMaterial;
//material->setColor(OUTLINE_COLOR);
//outlineGeomNode->setMaterial(material);
//outlineGeomNode->setFlag(QSGNode::OwnsMaterial);
QSGGeometryNode *barGeomNode = new QSGGeometryNode;
QSGGeometry *barGeometry =
new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(), 4);
barGeometry->setDrawingMode(GL_POLYGON);
barGeomNode->setGeometry(barGeometry);
barGeomNode->setFlag(QSGNode::OwnsGeometry);
QSGFlatColorMaterial *material = new QSGFlatColorMaterial;
material->setColor(BAR_COLOR);
barGeomNode->setMaterial(material);
barGeomNode->setFlag(QSGNode::OwnsMaterial);
QSGOpacityNode *opacityNode = new QSGOpacityNode;
opacityNode->setOpacity(DEFAULT_OPACITY);
opacityNode->appendChildNode(barGeomNode);
//opacityNode->appendChildNode(outlineGeomNode);
return opacityNode;
}
void BarChart::updateViewport(QSGNode *root) const
{
QSGTransformNode *viewportNode = static_cast<QSGTransformNode *>(root);
QMatrix4x4 viewport;
viewport.scale(width(), height());
viewportNode->setMatrix(viewport);
}
void BarChart::updateBarNodeGeom(QSGNode *barNode, float x, float barWidth, float barHeight)
{
float y = 1.0f - barHeight;
QSGGeometryNode *barGeomNode =
static_cast<QSGGeometryNode *>(barNode->firstChild());
updateRectGeometry(barGeomNode->geometry(), x, y, barWidth, barHeight);
barGeomNode->markDirty(QSGNode::DirtyGeometry);
//QSGGeometryNode *outlineGeomNode =
// static_cast<QSGGeometryNode *>(barGeomNode->nextSibling());
//updateRectGeometry(outlineGeomNode->geometry(), x, y, barWidth, barHeight);
//outlineGeomNode->markDirty(QSGNode::DirtyGeometry);
}
void BarChart::updateBarNodeColor(QSGNode *barNode, const QColor &color)
{
QSGGeometryNode *barGeomNode =
static_cast<QSGGeometryNode *>(barNode->firstChild());
QSGFlatColorMaterial *material =
static_cast<QSGFlatColorMaterial *>(barGeomNode->material());
material->setColor(color);
barGeomNode->markDirty(QSGNode::DirtyMaterial);
}
void BarChart::updateBars(QSGNode *root)
{
float barWidth = 1.0f / m_values.n_elem;
QSGNode *node = root->firstChild();
float x = 0;
for (auto it = m_originalIndices.cbegin(); it != m_originalIndices.cend(); it++) {
updateBarNodeGeom(node, x, barWidth, m_scale(m_values[*it]));
updateBarNodeColor(node, m_colorScale->color(m_values[*it]));
x += barWidth;
node = node->nextSibling();
}
}
QSGNode *BarChart::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *)
{
QSGNode *root = oldNode ? oldNode : newSceneGraph();
updateViewport(root);
if (m_shouldUpdateBars) {
int numValues = (int) m_values.n_elem;
// First, make sure we have the same number of values & bars
while (numValues > root->childCount()) {
QSGNode *barNode = newBarNode();
root->appendChildNode(barNode);
}
while (numValues < root->childCount()) {
// NOTE: as stated in docs, QSGNode's children are stored in a
// linked list. Hence, this operation should be as fast as expected
root->removeChildNode(root->firstChild());
}
// Then, update the bars to reflect the values
updateBars(root);
m_shouldUpdateBars = false;
}
return root;
}
void BarChart::hoverMoveEvent(QHoverEvent *event)
{
// TODO
}
void BarChart::mousePressEvent(QMouseEvent *event)
{
// TODO
}
|
