gallery_sin_curve.cpp

This gallery example demonstrates creating a basic sine wave plot using Plotly.cpp. It showcases fundamental plotting capabilities with mathematical function visualization over a continuous domain.

Features demonstrated:

• Mathematical function plotting using scatter trace type
• Continuous curve generation with linspace utility
• Basic trigonometric function visualization (sine wave)
• Simple plot creation with minimal configuration
• Standard domain range (-2π to 2π) for complete wave cycles
• High-resolution curve with 200 data points for smooth visualization

Mathematical concepts:

• Sine function: y = sin(x)
• Domain: [-2π, 2π] covering two complete oscillation cycles
• Amplitude: 1.0 (standard unit amplitude)
• Period: 2π (standard sine wave period)

This example serves as an introduction to basic mathematical function plotting and demonstrates the ease of creating smooth curves with Plotly.cpp's scatter trace functionality.

Sine Wave Mathematical Function

 
#include "plotly/plotly.hpp"
#include "utils/arg_parser.hpp"
#include "utils/linspace.hpp"
#include <cmath>
#include <vector>
 
auto main(int argc, char *argv[]) -> int {
  // Parse command line arguments
  auto args = parseGalleryArgs(argc, argv);
 
  plotly::Figure fig;
  fig.openBrowser(args.headless);
 
  // Generate x values from -2π to 2π
  auto x = linspace(-2 * M_PI, 2 * M_PI, 200);
 
  // Calculate sin values
  std::vector<double> y;
  y.reserve(x.size());
  for (const auto &xi : x) {
    y.push_back(std::sin(xi));
  }
 
  // Create scatter trace for sin curve
  plotly::Object trace = {
      {"x", x},
      {"y", y},
      {"type", "scatter"},
  };
 
  // Create the plot
  std::vector<plotly::Object> data = {trace};
  fig.newPlot(data);
 
  if (!args.headless) {
    fig.waitClose();
  } else {
    // Save image instead of opening browser
    plotly::Object imageOpts = {{"format", "png"},
                                {"width", 800},
                                {"height", 600},
                                {"filename", "sin_curve"}};
    fig.downloadImage(imageOpts);
  }
 
  return 0;
}