Cookbook

Each recipe links to a complete runnable example.

Use case	Covers
Basic static plot	Axes, several curves, markers, and a legend
Real-time scrolling data	A fixed window updated once per rendered frame, with dropouts as gaps
Axis formats	Date/time, categories, logarithmic scales, and custom labels
Multiple axes	Secondary scales and signals with different domains
Styling and transitions	Dashes, markers, gradients, fills, and animated updates
Annotations and tools	Data-attached labels, regions, measurement tools, and mouse handling
Data inspection	Crosshair, tooltip, nearest-data-point queries, region statistics, and selection
Point clouds	Large unconnected scatter data, coloring points by value, color bars, and hover picking
Heatmaps	Grids of values colored through a colormap, color bars, and reading cells
Rectangle zoom	Drag a region to zoom all axes, or zoom from a custom tool
Bar charts	Vertical, horizontal, and grouped bars, baselines, category colors, and hover
Histograms	Equal and uneven bins, counts or density, from QML or C++
Bands	Confidence intervals and envelopes between a low and a high value, with edge lines
Error bars	Symmetric and asymmetric errors, vertical and horizontal, on points and grouped bars
Background data production	Safe high-throughput worker-to-UI handoff
Exporting images	PNG, JPEG, and other raster files, the clipboard, and QImage capture

For method-by-method detail, use the API reference. For choosing a data path, use the Performance guide.