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Open Source · LGPL Licensed

Qt Plotting Library

A high-performance 2D/3D plotting library for Qt applications, designed 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 Fully Compatible
LGPL Commercial Friendly

Core Features

Everything you need for professional data visualization in Qt applications.

High Performance

Optimized QPainter rendering pipeline for large-scale datasets. Smooth real-time plotting with efficient redraw strategies.

Rich Chart Types

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

CMake & Qt6

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

Multi-Axis System

Create unlimited independent axes via parasite plot architecture — similar to matplotlib's twin axis system with full interaction support.

Modern Design

Clean, flat visual style replacing the legacy embossed look. Professional aesthetics that fit contemporary application design.

Figure Layout

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

Visualization Showcase

From basic charts to advanced 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

Integrate QWT into your project in minutes.

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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)

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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");

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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 Today

Explore the documentation or browse the source code.

Read the Docs 中文文档 GitHub Gitee