[FEATURE]: Support Curved-Boundary Bar Charts with Dynamic Phase/Threshold Detection

What problem does this feature solve?

In physical domain modeling (such as thermodynamic P-T phase diagrams), industrial monitoring, and multi-parameter threshold analysis, data visualization often requires representing dynamic bar elements within a two-dimensional parameter space that interact with non-linear, curved decision boundaries.

Current Limitations:

1. Linear/Static Boundaries: Current shapes/shapes annotations in Plotly primarily target horizontal, vertical, or simple linear lines. Defining polynomial or spline-based curved boundary lines for dynamic spatial partitioning is not natively streamlined.
2. Complex Collision Logic: Calculating real-time intersections (collision detection) between moving/resizing bar vertices (e.g., X position = Pressure, Y height = Temperature) and curved thresholds to dynamically update bar styling (e.g., solid, liquid, gas, or custom status) is mathematically complex to implement manually on top of standard trace types.

Expected Experience:

We hope Plotly could consider providing native support or built-in mechanisms for curved decision boundaries. When a bar's position along the X-axis or height along the Y-axis changes, the chart can evaluate its top vertex against curved boundaries to trigger real-time state changes and dynamic styling.

🔗 Live Demo & Repository

• Live Demo: https://cnlnr.github.io/Curved-Boundary-Bar-Chart/
• GitHub Repository: https://github.com/cnlnr/Curved-Boundary-Bar-Chart

Commencez par la démo en direct et le dépôt liés, puis examinez la prise en charge existante par plotly.py des shapes et des annotations décrite dans l’issue. Aucun fichier ni test précis n’est indiqué ; définissez la portée de l’API et les critères d’acceptation pour les limites courbes, la détection des collisions et le style dynamique des barres avant l’implémentation.