PieChart

#include "toolkit/charts/pie_chart.hpp"

A pie (or donut) chart with optional legend and slice labels. Unlike the other chart widgets, it has no axes/grid and doesn't use ChartInteraction pan/zoom. Inherits Widget.

macOS

Material

Windows 11

Windows 95

Plasma 6

GNOME

Data type

struct PieSlice { std::string label; float value; Color color; };

Example

auto chart = std::make_unique<toolkit::PieChart>();
chart->set_slices({
    {"Chrome", 64, toolkit::Color::rgb(0.9f, 0.6f, 0.1f)},
    {"Firefox", 12, toolkit::Color::rgb(0.9f, 0.4f, 0.1f)},
    {"Other", 24, toolkit::Color::rgb(0.5f, 0.5f, 0.5f)},
});
chart->set_donut(true);

Construction

PieChart();

API

Member	Description
set_slices(std::vector<PieSlice>) / clear() / slice_count()	Set the pie's data
set_title(std::string)	Chart title
set_donut(bool)	Render as a donut (ring) instead of a filled pie
set_show_legend(bool) / set_show_labels(bool)	Toggle chrome

Callbacks

Callback	Description
on_hover — std::function<void(size_t slice_idx)>	Fired as the pointer hovers a slice