Module ctrl 

Interactive UI controls rendered via AGG’s rendering pipeline.

Port of ctrl/agg_slider_ctrl.h, ctrl/agg_cbox_ctrl.h, ctrl/agg_rbox_ctrl.h.

Controls are vertex sources with multiple colored paths. Use render_ctrl() to render them into a renderer_base, which iterates paths and colors.

In the original C++ library, controls handle mouse interaction directly. In our WASM demos, the JS sidebar handles interaction and passes values as params; these controls render the visual representation on the canvas.

Structs

CboxCtrl

Checkbox control rendered via AGG.

GammaCtrl

Interactive gamma correction curve control.

RboxCtrl

Radio button box control rendered via AGG.

ScaleCtrl

Two-handle range slider (min/max selector).

SliderCtrl

Horizontal slider control rendered via AGG.

SplineCtrl

Spline control rendered via AGG.

Traits

Ctrl

Trait for AGG controls that can be rendered as multi-path vertex sources.

Functions

render_ctrl

Render a control by iterating its paths and rendering each with its color.