Struct SplineWidget 

pub struct SplineWidget {
    pub points: Vec<Vec3>,
    pub colour: [f32; 4],
    pub line_width: f32,
    pub handle_colour: [f32; 4],
    pub resolution: u32,
    /* private fields */
}

An interactive spline widget with N draggable Catmull-Rom control points.

Each frame call update() to advance state, then push polyline_item() into fd.scene.polylines and handle_glyphs() into fd.scene.glyphs.

Fields

points: Vec<Vec3>

Control point positions.

colour: [f32; 4]

Colour of the spline curve.

line_width: f32

Width of the spline curve in pixels.

handle_colour: [f32; 4]

Colour of the control point handles.

resolution: u32

Number of samples between each pair of adjacent control points.

Implementations

impl SplineWidget

pub fn new(points: Vec<Vec3>) -> Self

Create a new spline widget with the given control points.

pub fn hovered_point(&self) -> Option<usize>

Returns the index of the currently hovered control point, if any.

pub fn is_active(&self) -> bool

Returns true when a control point drag is in progress.

pub fn update(&mut self, ctx: &WidgetContext) -> WidgetResult

Advance widget state from cursor input. Call once per frame before pushing render items.

pub fn polyline_item(&self, id: u64) -> PolylineItem

Build a PolylineItem with the sampled Catmull-Rom spline.

pub fn handle_glyphs(&self, id_base: u64, ctx: &WidgetContext) -> GlyphItem

Build a GlyphItem with sphere handles for each control point.

Hovered and active handles are brightened via use_default_colour and default_colour. For per-handle highlight, call with a separate GlyphItem for the active handle.

pub fn sampled_positions(&self) -> Vec<[f32; 3]>

Evaluate the Catmull-Rom spline and return sampled world-space positions.