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- #include "CustomLineGraph.h"
- #include <QDebug>
- #include <QBrush>
- #include <random>
- #include <algorithm>
- CustomLineGraph::CustomLineGraph(QWidget* parent):QWidget(parent), linePen(Qt::blue), rectPen(Qt::red), axisPen(Qt::black)
- {
- linePen.setWidth(3);
- linePen.setJoinStyle(Qt::PenJoinStyle::RoundJoin);
- LineGraphSeries lgs;
- //Populate data with DummyData
- //Draw Points
- std::random_device rd; //Will be used to obtain a seed for the random number engine
- std::mt19937 gen(rd()); //Standard mersenne_twister_engine seeded with rd()
- std::uniform_int_distribution<> dis(-3, 3);
- for (int randomSeries = 0; randomSeries < 2; randomSeries++) {
- for (int i = 0; i < 21; i++) {
- QPoint point(i * 50 + 500,i * 1 + dis(gen) - 10000);
- lgs.data.push_back(point);
- }
- auto pairX = std::minmax_element(std::begin(lgs.data), std::end(lgs.data), [](const QPoint& a,const QPoint& b) -> bool {return a.x() < b.x(); });
- lgs.minX = pairX.first->x();
- lgs.maxX = pairX.second->x();
- auto pairY = std::minmax_element(std::begin(lgs.data), std::end(lgs.data), [](const QPoint& a, const QPoint& b) -> bool {return a.y() < b.y(); });
- lgs.minY = pairY.first->y();
- lgs.maxY = pairY.second->y();
- lgs.rangeX = std::abs(lgs.maxX - lgs.minX);
- lgs.rangeY = std::abs(lgs.maxY - lgs.minY);
- seriesVec.push_back(lgs);
- }
- }
- CustomLineGraph::~CustomLineGraph()
- {
- }
- void CustomLineGraph::paintEvent(QPaintEvent* event)
- {
- QPainter painter(this);
- painter.setRenderHint(QPainter::RenderHint::HighQualityAntialiasing);
-
- //Calculate LineRect
- QRect lineRect(rect());
- lineRect.setBottom(lineRect.bottom() - 20);
- lineRect.setLeft(lineRect.left() + 40);
- lineRect.setTop(lineRect.top() + 20);
- lineRect.setRight(lineRect.right() - 10);
- lineRect.setWidth(lineRect.width() - (lineRect.width() % 10) + 1);
- lineRect.setHeight(lineRect.height() - (lineRect.height() % 10) + 1);
- //draw Title
- painter.setPen(axisPen);
- painter.setFont(QFont("Arial", 12));
- QRect titleRect(QPoint(lineRect.left(), rect().top()), QPoint(lineRect.right(), lineRect.top()));
- painter.drawText(titleRect, Qt::AlignCenter, "title");
- //draw X-Axis
- QRect xAxisRect(QPoint(lineRect.left(), lineRect.bottom()), QPoint(lineRect.right(), rect().bottom()));
- QPainterPath xAxisPath;
- xAxisPath.moveTo(xAxisRect.left(), xAxisRect.top());
- xAxisPath.lineTo(xAxisRect.right(), xAxisRect.top());
- int xGap = xAxisRect.width() / 10;
- for (int i = 0; i < 11; i++) {
- xAxisPath.moveTo(xAxisRect.left() + i * xGap, xAxisRect.top() + 5);
- xAxisPath.lineTo(xAxisRect.left() + i * xGap, xAxisRect.top());
- }
- painter.drawPath(xAxisPath);
- //draw Y-Axis
- QRect yAxisRect(QPoint(rect().left(), lineRect.top()), QPoint(lineRect.left(), lineRect.bottom()));
- QPainterPath yAxisPath;
- yAxisPath.moveTo(yAxisRect.right(), yAxisRect.bottom() + 5);
- yAxisPath.lineTo(yAxisRect.right(), yAxisRect.top());
- int yGap = yAxisRect.height() / 10;
- for (int i = 0; i < 11; i++) {
- yAxisPath.moveTo(yAxisRect.right() - 5, yAxisRect.top() + i * yGap);
- yAxisPath.lineTo(yAxisRect.right(), yAxisRect.top() + i * yGap);
- }
- painter.drawPath(yAxisPath);
-
-
- painter.setPen(linePen);
- for (LineGraphSeries series : seriesVec) {
- double stregth_factorX = lineRect.width() / series.rangeX;
- double stregth_factorY = lineRect.height() / series.rangeY;
- QPointF translation(lineRect.left(), lineRect.top());
- QPainterPath painterPath;
- painterPath.moveTo(transformPoint(series.data[0], series, stregth_factorX, stregth_factorY));
- for(int i = 1; i < seriesVec[0].data.size(); i++) {
- painterPath.lineTo(transformPoint(series.data[i], series, stregth_factorX, stregth_factorY));
- }
- painterPath.translate(translation);
- painter.drawPath(painterPath);
- int radius;
- for (int i = 0; i < seriesVec[0].data.size(); i++) {
- painter.drawEllipse(transformPoint(series.data[i], series, stregth_factorX, stregth_factorY) + translation, 3, 3);
- }
- }
-
- }
- QPoint CustomLineGraph::transformPoint(QPoint& point, LineGraphSeries& lgs, double stregth_factorX, double stregth_factorY)
- {
- return QPoint((point.x() - lgs.minX)* stregth_factorX , (lgs.maxY - point.y()) * stregth_factorY);
- }
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