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CartesianLineGraph2D.cpp
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174 lines (158 loc) · 4.89 KB
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#include "wplot/CartesianLineGraph2D.h"
#include "wplot/Plot2D.h"
#include <QPainter>
#include <QImage>
namespace WPlot {
///////////////////////////////////////////////////////////////////////////////
// PUBLIC SECTION //
///////////////////////////////////////////////////////////////////////////////
CartesianLineGraph2D::CartesianLineGraph2D() :
CartesianScalarGraph2D(),
m_lineColor(Qt::black),
m_fillColor(0, 0, 0, 0),
m_lineWidth(1.0),
m_fillColorYCoordinate(0.0)
{
m_pen.setColor(m_lineColor);
m_pen.setWidthF(m_lineWidth);
}
/**
* Set the color of the line.
*
* @param[in] color Color.
*/
void CartesianLineGraph2D::setLineColor(const QColor &color) {
m_lineColor = color;
m_pen.setColor(color);
m_colorFunctionDefined = false;
}
/**
* Set the color for filling.
*
* @param[in] color Color.
*/
void CartesianLineGraph2D::setFillColor(const QColor &color) {
m_fillColor = color;
}
/**
* Set the coordinate that must be used in order to create the filling.
*
* @param[in] coordinate Coordinate.
*/
void CartesianLineGraph2D::setFillYCoordinate(const double &coordinate) {
m_fillColorYCoordinate = coordinate;
}
/**
* Set the width of the line in pixels.
*
* @param[in] width Width.
*/
void CartesianLineGraph2D::setLineWidth(const double &width) {
m_lineWidth = width;
m_pen.setWidthF(width);
}
///////////////////////////////////////////////////////////////////////////////
// VIRTUAL PUBLIC SECTION //
///////////////////////////////////////////////////////////////////////////////
/**
* Draw the graph into specified plot.
*
* @param[inout] plot Plot.
*
* @internal It's not possible do define
*/
void CartesianLineGraph2D::draw(Plot2D *plot) {
if (m_fillColor.alpha() != 0) {
drawFilling(plot);
}
if (false == m_colorFunctionDefined) {
drawSolidColorLine(plot);
} else {
drawGradientLine(plot);
}
}
///////////////////////////////////////////////////////////////////////////////
// PRIVATE SECTION //
///////////////////////////////////////////////////////////////////////////////
void CartesianLineGraph2D::drawSolidColorLine(Plot2D *plot) {
if (m_data.size() < 2) {
return;
}
QPolygonF points;
QPainter painter(plot);
plot->initializePainter(painter);
painter.setPen(m_pen);
for (const auto& it : m_data) {
points.append(plot->scalePoint(it));
}
painter.drawPolyline(points);
}
void CartesianLineGraph2D::drawGradientLine(Plot2D *plot) {
if (m_data.size() < 2) {
return;
}
QImage image(plot->size(), QImage::Format_ARGB32_Premultiplied);
QPolygonF points;
QPainter painter(&image);
plot->initializePainter(painter);
m_pen.setColor(Qt::white);
painter.setCompositionMode(QPainter::CompositionMode_Source);
painter.setPen(m_pen);
for (auto& it : m_data) {
points.append(plot->scalePoint(it));
}
painter.drawPolyline(points);
//Draw gradient
painter.setCompositionMode(QPainter::CompositionMode_SourceIn);
// For every line segment draw the corresponding gradient region
const int size = m_data.size();
for (int i = 1; i < size; i++) {
const auto firstCorner = plot->scalePoint(m_data.at(i-1));
const auto secondCorner = plot->scalePoint(m_data.at(i));
const int xMin = std::min(firstCorner.x(), secondCorner.x()) - 2.0 * m_lineWidth;
const int xMax = std::max(firstCorner.x(), secondCorner.x()) + 2.0 * m_lineWidth;
const int yMin = std::min(firstCorner.y(), secondCorner.y()) - 2.0 * m_lineWidth;
const int yMax = std::max(firstCorner.y(), secondCorner.y()) + 2.0 * m_lineWidth;
const QPoint topLeftCorner(xMin, yMin);
const QPoint bottomRightCorner(xMax, yMax);
QImage gradientImage(xMax - xMin, yMax - yMin, QImage::Format_ARGB32);
int lineNumber = 0;
int columnNumber = 0;
for (int y = yMin; y < yMax; y++) {
QRgb *colorLine = reinterpret_cast<QRgb*>(gradientImage.scanLine(lineNumber));
for (int x = xMin; x < xMax; x++) {
const QPointF colorPoint(plot->inverseScalePoint(x, y));
QRgb color = m_colorFunction(colorPoint).rgba();
colorLine[columnNumber] = color;
columnNumber++;
}
lineNumber++;
columnNumber = 0;
}
painter.drawImage(QRect(topLeftCorner, bottomRightCorner), gradientImage);
}
QPainter plotPainter(plot);
plot->initializePainter(plotPainter);
plotPainter.drawImage(0, 0, image);
}
void CartesianLineGraph2D::drawFilling(Plot2D *plot) {
if (m_data.size() < 2) {
return;
}
QPainter painter(plot);
QPen pen;
QPolygonF polygon;
QBrush brush;
brush.setColor(m_fillColor);
brush.setStyle(Qt::SolidPattern);
painter.setBrush(brush);
pen.setBrush(brush);
painter.setPen(pen);
for (const auto& it : m_data) {
polygon << plot->scalePoint(it);
}
polygon << plot->scalePoint(m_data.back().x(), m_fillColorYCoordinate);
polygon << plot->scalePoint(m_data.front().x(), m_fillColorYCoordinate);
painter.drawPolygon(polygon);
}
} // namespace WPlot