xychartitem.cpp
142 lines
| 3.5 KiB
| text/x-c
|
CppLexer
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r466 | #include "xychartitem_p.h" | ||
#include "qxyseries.h" | ||||
#include "chartpresenter_p.h" | ||||
#include <QPainter> | ||||
QTCOMMERCIALCHART_BEGIN_NAMESPACE | ||||
//TODO: optimize : remove points which are not visible | ||||
XYChartItem::XYChartItem(QXYSeries* series,QGraphicsItem *parent):ChartItem(parent), | ||||
m_minX(0), | ||||
m_maxX(0), | ||||
m_minY(0), | ||||
m_maxY(0), | ||||
m_series(series) | ||||
{ | ||||
QObject::connect(series,SIGNAL(pointReplaced(int)),this,SLOT(handlePointReplaced(int))); | ||||
QObject::connect(series,SIGNAL(pointAdded(int)),this,SLOT(handlePointAdded(int))); | ||||
QObject::connect(series,SIGNAL(pointRemoved(int)),this,SLOT(handlePointRemoved(int))); | ||||
} | ||||
QPointF XYChartItem::calculateGeometryPoint(const QPointF& point) const | ||||
{ | ||||
const qreal deltaX = m_size.width()/(m_maxX-m_minX); | ||||
const qreal deltaY = m_size.height()/(m_maxY-m_minY); | ||||
qreal x = (point.x() - m_minX)* deltaX; | ||||
qreal y = (point.y() - m_minY)*-deltaY + m_size.height(); | ||||
return QPointF(x,y); | ||||
} | ||||
QPointF XYChartItem::calculateGeometryPoint(int index) const | ||||
{ | ||||
const qreal deltaX = m_size.width()/(m_maxX-m_minX); | ||||
const qreal deltaY = m_size.height()/(m_maxY-m_minY); | ||||
qreal x = (m_series->x(index) - m_minX)* deltaX; | ||||
qreal y = (m_series->y(index) - m_minY)*-deltaY + m_size.height(); | ||||
return QPointF(x,y); | ||||
} | ||||
QVector<QPointF> XYChartItem::calculateGeometryPoints() const | ||||
{ | ||||
const qreal deltaX = m_size.width()/(m_maxX-m_minX); | ||||
const qreal deltaY = m_size.height()/(m_maxY-m_minY); | ||||
QVector<QPointF> points; | ||||
points.reserve(m_series->count()); | ||||
for (int i = 0; i < m_series->count(); ++i) { | ||||
qreal x = (m_series->x(i) - m_minX)* deltaX; | ||||
qreal y = (m_series->y(i) - m_minY)*-deltaY + m_size.height(); | ||||
points << QPointF(x,y); | ||||
} | ||||
return points; | ||||
} | ||||
void XYChartItem::updatePoints(QVector<QPointF>& points) | ||||
{ | ||||
setGeometry(points); | ||||
} | ||||
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r476 | void XYChartItem::updatePoint(QVector<QPointF>& points) | ||
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r466 | { | ||
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r476 | setGeometry(points); | ||
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r466 | } | ||
void XYChartItem::setGeometry(QVector<QPointF>& points) | ||||
{ | ||||
m_points = points; | ||||
} | ||||
//handlers | ||||
void XYChartItem::handlePointAdded(int index) | ||||
{ | ||||
Q_ASSERT(index<m_series->count()); | ||||
Q_ASSERT(index>=0); | ||||
QPointF point = calculateGeometryPoint(index); | ||||
QVector<QPointF> points = m_points; | ||||
points.insert(index,point); | ||||
updatePoints(points); | ||||
update(); | ||||
} | ||||
void XYChartItem::handlePointRemoved(int index) | ||||
{ | ||||
Q_ASSERT(index<m_series->count()); | ||||
Q_ASSERT(index>=0); | ||||
QPointF point = calculateGeometryPoint(index); | ||||
QVector<QPointF> points = m_points; | ||||
points.remove(index); | ||||
updatePoints(points); | ||||
update(); | ||||
} | ||||
void XYChartItem::handlePointReplaced(int index) | ||||
{ | ||||
Q_ASSERT(index<m_series->count()); | ||||
Q_ASSERT(index>=0); | ||||
QPointF point = calculateGeometryPoint(index); | ||||
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r476 | QVector<QPointF> points = m_points; | ||
m_points.replace(index,point); | ||||
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r519 | updatePoint(m_points); | ||
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r466 | update(); | ||
} | ||||
void XYChartItem::handleDomainChanged(qreal minX, qreal maxX, qreal minY, qreal maxY) | ||||
{ | ||||
m_minX=minX; | ||||
m_maxX=maxX; | ||||
m_minY=minY; | ||||
m_maxY=maxY; | ||||
if(isEmpty()) return; | ||||
QVector<QPointF> points = calculateGeometryPoints(); | ||||
updatePoints(points); | ||||
update(); | ||||
} | ||||
void XYChartItem::handleGeometryChanged(const QRectF& rect) | ||||
{ | ||||
Q_ASSERT(rect.isValid()); | ||||
m_size=rect.size(); | ||||
m_clipRect=rect.translated(-rect.topLeft()); | ||||
setPos(rect.topLeft()); | ||||
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r519 | if(isEmpty()) return; | ||
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r466 | QVector<QPointF> points = calculateGeometryPoints(); | ||
updatePoints(points); | ||||
update(); | ||||
} | ||||
bool XYChartItem::isEmpty() | ||||
{ | ||||
return !m_clipRect.isValid() || m_maxX - m_minX == 0 || m_maxY - m_minY ==0 ; | ||||
} | ||||
#include "moc_xychartitem_p.cpp" | ||||
QTCOMMERCIALCHART_END_NAMESPACE | ||||