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functionnal colorbar
functionnal colorbar
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colormapchart.cpp
250 lines | 7.5 KiB | text/x-c | CppLexer
/ src / charts / colormapchart / colormapchart.cpp
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winter
first init : ColorMapChart added to QtCharts
 r0 #include <private/colormapchart_p.h>
#include <QtCharts/QColorMapSeries>
#include <private/qcolormapseries_p.h>
#include <private/chartpresenter_p.h>
#include <private/abstractdomain_p.h>
#include <private/chartdataset_p.h>
#include <private/qabstractaxis_p.h>
#include <QtGui/QPainter>
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 r1 #include <QRgb>
#define nbOfColors 65000
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 r0
QT_CHARTS_BEGIN_NAMESPACE
ColorMapChart::ColorMapChart(QColorMapSeries *series, QGraphicsItem *item)
: ChartItem(series->d_func(), item),
m_series(series),
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 r1 m_dirty(true),
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 r2 m_gradientType(Rainbow),
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 r4 m_colorbar(Q_NULLPTR),
m_isColorBarDrawn(false),
m_currentplotArea(QRectF()),
m_grid(Q_NULLPTR)
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 r0 {
// QObject::connect(series, SIGNAL(pointReplaced(int)), this, SLOT(handlePointReplaced(int)));
// QObject::connect(series, SIGNAL(pointsReplaced()), this, SLOT(handlePointsReplaced()));
// QObject::connect(series, SIGNAL(pointAdded(int)), this, SLOT(handlePointAdded(int)));
// QObject::connect(series, SIGNAL(pointRemoved(int)), this, SLOT(handlePointRemoved(int)));
// QObject::connect(series, SIGNAL(pointsRemoved(int, int)), this, SLOT(handlePointsRemoved(int, int)));
// QObject::connect(this, SIGNAL(clicked(Point3D)), series, SIGNAL(clicked(Point3D)));
// QObject::connect(this, SIGNAL(hovered(Point3D,bool)), series, SIGNAL(hovered(Point3D,bool)));
// QObject::connect(this, SIGNAL(pressed(Point3D)), series, SIGNAL(pressed(Point3D)));
// QObject::connect(this, SIGNAL(released(Point3D)), series, SIGNAL(released(Point3D)));
// QObject::connect(this, SIGNAL(doubleClicked(Point3D)), series, SIGNAL(doubleClicked(Point3D)));
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 r1 connect(this,SIGNAL(gradientTypeChanged()), this, SLOT(populateColorTable()));
m_colorTable = new QVector<QRgb>();
m_colorTable->reserve(nbOfColors);
populateColorTable();
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 r0 }
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 r4 ColorMapChart::~ColorMapChart()
{
delete m_colorTable;
delete m_colorbar;
}
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first init : ColorMapChart added to QtCharts
 r0 void ColorMapChart::setDirty(bool dirty)
{
m_dirty = dirty;
}
QRectF ColorMapChart::boundingRect() const
{
return m_rect;
}
void ColorMapChart::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
Q_UNUSED(widget)
Q_UNUSED(option)
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 r3 m_series->setUseOpenGL();
painter->save();
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 r0 QRectF clipRect = QRectF(QPointF(0, 0), domain()->size());
painter->setClipRect(clipRect);
QRectF plotAreaRect = m_series->chart()->plotArea();
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 r4 if(m_currentplotArea !=plotAreaRect)
{
m_currentplotArea = plotAreaRect;
m_grid = m_series->getUniformGrid(0,0,plotAreaRect.width(),plotAreaRect.height(),QColorMapSeries::LastPixel);
addColorBar(plotAreaRect);
}
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 r0 QImage colorMapImage(plotAreaRect.width(),plotAreaRect.height(),QImage::Format_RGB32);
//http://doc.qt.io/qt-4.8/qimage.html#details :Warning: This will create a QImage with uninitialized data. Call fill() to fill the image with an appropriate pixel value before drawing onto it with QPainter.
colorMapImage.fill(QColor(Qt::white).rgb());
double maxZ = m_series->maxZ();
double minZ = m_series->minZ();
double rangeZ = maxZ - minZ;
winter
improvements in execution time, colorbar ok, more work to do on axes,
 r3 int imageWidth = colorMapImage.width();
int imageHeight = colorMapImage.height();
for(int i=0;i<imageWidth;i++)
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 r0 {
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 r3 for(int j=0;j<imageHeight;j++)
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 r0 {
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 r4 double value = m_grid->at(i+j*(imageWidth));
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 r0 double pix=((value-minZ)/rangeZ);
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 r1 int indexInColorTable = pix*(nbOfColors-1);
colorMapImage.setPixel(i,j,m_colorTable->at(indexInColorTable));
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 r0 }
}
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 r2
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 r0 painter->drawImage(clipRect,colorMapImage);
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 r4 //This line was causing re-painting loop
//update();//Qt docs: Warning: If you call repaint() in a function which may itself be called from paintEvent(), you may get infinite recursion. The update() function never causes recursion
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 r3
painter->restore();
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 r2 }
winter
first init : ColorMapChart added to QtCharts
 r0
winter
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 r3 void ColorMapChart::addColorBar(QRectF plotAreaRect)
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 r2 {
double maxZ = m_series->maxZ();
double minZ = m_series->minZ();
winter
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 r3
if(m_isColorBarDrawn)
m_series->chart()->removeAxis(m_colorbar);
m_colorbar = new QColorBarAxis(plotAreaRect,createColorMapGradient(m_gradientType),minZ, maxZ,this);
m_series->chart()->addAxis(m_colorbar, Qt::AlignRight);
m_isColorBarDrawn = true;
winter
first init : ColorMapChart added to QtCharts
 r0 }
/*!
Returns the predefined QLinearGradient corresponding to the \a gradientType passed as argument.
*/
QLinearGradient ColorMapChart::createColorMapGradient(GradientType gradientType)
{
QLinearGradient gradient(0,0,1,100);
switch(gradientType)
{
case Rainbow :
gradient.setColorAt(1.0,Qt::darkRed);
gradient.setColorAt(0.8,Qt::red);
gradient.setColorAt(0.6,Qt::yellow);
gradient.setColorAt(0.4,Qt::green);
gradient.setColorAt(0.2,Qt::cyan);
gradient.setColorAt(0.0,Qt::blue);
break;
case CyclingRainbow :
gradient.setColorAt(1.0,Qt::red);
gradient.setColorAt(0.8,Qt::yellow);
gradient.setColorAt(0.6,Qt::green);
gradient.setColorAt(0.4,Qt::cyan);
gradient.setColorAt(0.2,Qt::blue);
gradient.setColorAt(0.0,Qt::magenta);
break;
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 r1 case BlackAndWhite :
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 r0 gradient.setColorAt(1.0, Qt::black);
gradient.setColorAt(0.0, Qt::white);
break;
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 r1 case ReverseBlackAndWhite :
gradient.setColorAt(1.0, Qt::white);
gradient.setColorAt(0.0, Qt::black);
break;
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 r0 default:
break;
}
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 r1 return gradient;
}
/*!
Changes the type of gradient used to paint the ColorMap.
*/
void ColorMapChart::changeGradient(GradientType gradientType)
{
if(m_gradientType == gradientType)
return;
else
m_gradientType = gradientType;
emit gradientTypeChanged();
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 r0 }
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 r1 /*!
Creates a color table corresponding to the gradient type currently selected.
*/
void ColorMapChart::populateColorTable()
{
QLinearGradient gradient = createColorMapGradient(m_gradientType);
QGradientStops colorStops = gradient.stops();
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 r0
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 r1 for(int i=0;i<nbOfColors;i++)
{
double colorIndex = (double)i/nbOfColors;
for(int k =0;k<colorStops.size()-1;k++)
{
QGradientStop lowerBound = colorStops.at(k);
QGradientStop upperBound = colorStops.at(k+1);
if(colorIndex >= lowerBound.first && colorIndex < upperBound.first)
{
double ratio = (colorIndex-lowerBound.first)/(upperBound.first - lowerBound.first);
int red = (int)((1-ratio)*lowerBound.second.red() + ratio*upperBound.second.red());
int green = (int)((1-ratio)*lowerBound.second.green() + ratio*upperBound.second.green());
int blue = (int)((1-ratio)*lowerBound.second.blue() + ratio*upperBound.second.blue());
m_colorTable->append(qRgb(red, green, blue));
break;
}
else
{
if(k==colorStops.size()-2)
{
m_colorTable->append(qRgb(colorStops.at(colorStops.size()-1).second.red(), colorStops.at(colorStops.size()-1).second.green(), colorStops.at(colorStops.size()-1).second.blue()));
}
}
}
}
}
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 r0
//handlers
void ColorMapChart::handlePointAdded(int index)
{
}
void ColorMapChart::handlePointRemoved(int index)
{
}
void ColorMapChart::handlePointsRemoved(int index, int count)
{
}
void ColorMapChart::handlePointReplaced(int index)
{
}
void ColorMapChart::handlePointsReplaced()
{
}
void ColorMapChart::handleDomainUpdated()
{
}
bool ColorMapChart::isEmpty()
{
}
#include "moc_colormapchart_p.cpp"
QT_CHARTS_END_NAMESPACE