Annotations

Horizontal/vertical lines, text labels, rectangles, ellipses, and arrows.

Source Code

#include <QApplication>
#include <QWidget>
#include <QVBoxLayout>
#include <cmath>

#include "AZPlottingClass.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    
    QWidget window;
    window.setWindowTitle("Annotations Demo");
    window.resize(800, 600);
    
    QVBoxLayout *layout = new QVBoxLayout(&window);
    layout->setContentsMargins(0, 0, 0, 0);
    
    AZPlottingClass *plot = new AZPlottingClass(&window);
    layout->addWidget(plot);
    
    // Generate a signal with features
    QVector<double> x, y;
    for (int i = 0; i < 500; ++i) {
        double t = i * 0.02;
        x.append(t);
        double signal = std::sin(t * 2) * std::exp(-t * 0.1);
        signal += 0.3 * std::sin(t * 7) * std::exp(-t * 0.15);
        signal += 0.5 * std::exp(-std::pow(t - 4.0, 2) / 0.5);
        y.append(signal);
    }
    
    plot->addDataSeries(x, y, "Signal", Qt::blue);
    
    // Horizontal lines
    plot->addHorizontalLine(0.0, QColor(150, 150, 150), "Zero", 1.0);
    plot->addHorizontalLine(0.6, Qt::red, "Threshold", 1.5);
    
    // Vertical lines
    plot->addVerticalLine(0.0, Qt::blue, "t=0");
    plot->addVerticalLine(4.0, QColor(76, 175, 80), "Peak", 1.5);
    plot->addVerticalLine(2.0, QColor(156, 39, 176), "Early", 1.0);
    
    // Shaded region
    plot->addRectAnnotation(0.0, -2.0, 2.0, 2.0,
                            Qt::transparent,
                            QColor(33, 150, 243, 40));
    
    // Text annotations
    plot->addTextAnnotation(4.0, 0.85, "Local Maximum", Qt::black, 10);
    plot->addTextAnnotation(1.0, 1.3, "Early Time Window", QColor(33, 150, 243), 11);
    
    // Ellipse annotation
    plot->addEllipseAnnotation(3.5, 0.3, 5.0, 1.0,
                               QColor(255, 152, 0),
                               QColor(255, 152, 0, 30),
                               2.0);
    
    // Arrow annotation
    plot->addArrowAnnotation(6.0, 0.8, 4.3, 0.6, Qt::darkGray, 1.5);
    
    // Configure plot
    plot->setTitle("Annotation Examples");
    plot->setXAxisLabel("Time (s)");
    plot->setYAxisLabel("Amplitude");
    
    plot->applyProfessionalStyle();
    plot->setInteractive(true, true);
    plot->setCrosshairEnabled(true);
    plot->setGridVisible(true, true);
    plot->autoScaleAll();
    plot->setYAxisRange(-1.2, 1.5);
    
    window.show();
    
    return app.exec();
}

Annotation Methods

// Horizontal/Vertical lines
plot->addHorizontalLine(y, color, label, width);
plot->addVerticalLine(x, color, label, width);

// Text
plot->addTextAnnotation(x, y, text, color, fontSize);

// Shapes
plot->addRectAnnotation(x1, y1, x2, y2, borderColor, fillColor);
plot->addEllipseAnnotation(x1, y1, x2, y2, borderColor, fillColor, width);
plot->addArrowAnnotation(x1, y1, x2, y2, color, width);