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Open Source · LGPL Licensed

Qt Plotting Library

A 2D/3D plotting library for Qt applications, for scientific computing and engineering data visualization.

C++11/17 CMake Qt 5.12+ / Qt 6
Get Started GitHub Gitee
20+ Chart Types
2D & 3D Visualization
Qt 5 & 6 Supported
LGPL Commercial Use

Core Features

2D and 3D plotting for Qt applications, from line charts to scientific visualization.

Performance

QPainter rendering pipeline optimized for large datasets. Redraw strategies keep real-time plots responsive.

Chart Types

20+ built-in chart types: curves, scatter, bar, box, histogram, spectrogram, K-line, vector field, polar plots, and 3D surfaces.

CMake & Qt6

CMake support with find_package(qwt). Single-file amalgamation available. Compatible with Qt 5.12+ and Qt 6.

Multi-Axis System

Create any number of independent axes through the parasite plot architecture, similar to matplotlib's twin axis system, with interaction support across all of them.

Flat Visual Style

Clean, flat visual style replacing the legacy embossed look. Fits current application design conventions.

Figure Layout

matplotlib-inspired QwtFigure for multi-plot grid layouts. Interactive drag, resize, and manage subplots with overlay widgets.

Visualization Showcase

Basic charts and scientific visualizations.

Figure Widget Figure Layout Simple Plot Curve Plot Scatter Plot Scatter Plot Bar Chart Bar Chart Spectrogram Spectrogram Vector Field Vector Field Box Chart Box Chart Stock Chart K-Line / Stock Polar Plot Polar Plot 3D Surface 3D Surface 3D Enrichments 3D Enrichments Parasite Plot Multi-Axis Oscilloscope Oscilloscope Real-Time Real-Time Plot Axis Zoom Axis Interaction Dials & Compass Dials & Compass

Quick Start

Add QWT to your project.

CMake (Recommended)

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# Find and link QWT
find_package(qwt REQUIRED)
target_link_libraries(${PROJECT_NAME} PRIVATE qwt::plot)

# For 3D plotting
target_link_libraries(${PROJECT_NAME} PRIVATE qwt::plot3d)

Single File

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// Add two files to your project:
//   src-amalgamate/QwtPlot.h
//   src-amalgamate/QwtPlot.cpp

#include "QwtPlot.h"

auto* plot = new QwtPlot();
auto* curve = new QwtPlotCurve("My Data");

First Plot

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#include <qwt_plot.h>
#include <qwt_plot_curve.h>

auto* plot = new QwtPlot("My First Plot");
auto* curve = new QwtPlotCurve("Sine Wave");

QVector<QPointF> data;
for (double x = 0; x < 10.0; x += 0.1)
    data.append(QPointF(x, std::sin(x)));
curve->setSamples(data);

curve->attach(plot);
plot->resize(600, 400);
plot->show();

Start Building

Explore the documentation or browse the source code.

Read the Docs 中文文档 GitHub Gitee