Area spline · A missing reading

A gap breaks outline and fill without inventing an observation.

Use a smooth filled trend for ordered values. The monotone curve adds no new observations; the fill ends at zero.

Category, numeric or UTC-time X and nullable Y. Null breaks outline and fill. Only original points appear in detail.

Markers, shared detail, legend, references and viewport are supported. Interpolation is fixed. Stacking and stack labels are rejected.

• Smooth area
• Stacked area spline
• 100% stacked area spline
• A missing reading
• Signed volume

• Introduction
• Installation
• Component API
• Touch and selection
• Customization
• Accessibility
• Testing
• Performance
• Status and compatibility
• Ecosystem
• Demos