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#include "barchart.h"
#include <algorithm>
#include "continuouscolorscale.h"
#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(ContinuousColorScale::builtin(ContinuousColorScale::HEATED_OBJECTS))
, 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());
m_colorScale.setExtents(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;
if (m_values.n_elem > 0) {
m_colorScale.setExtents(m_values.min(), m_values.max());
}
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)
{
QCursor dragCursor(Qt::SizeHorCursor);
setCursor(dragCursor);
}
void BarChart::mouseReleaseEvent(QMouseEvent *event)
{
unsetCursor();
}
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