Macro impl_graph_for_payoff_strategy 

macro_rules! impl_graph_for_payoff_strategy {
    ($($t:ty),*) => { ... };
}

Macro impl_graph_for_payoff_strategy generates implementations of the Graph trait for one or more given types. This is specifically designed for types that represent payoff strategies, enabling them to produce graph data and configurations for financial visualizations, such as profit/loss graphs based on an underlying price range.

Usage

Use the macro to implement the Graph trait for multiple types. For example: This will generate implementations of the Graph trait for TypeA and TypeB.

Generated Trait Implementation

graph_data

• Generates GraphData for the associated type by calculating the profit/loss data for a price range obtained from the get_best_range_to_show method.
• The result is displayed as two series:
  1. A “Positive Payoff” series (green) for profits.
  2. A “Negative Payoff” series (red) for losses.
• Handles profits, losses, and break-even points separately:
  • Break-even points (0) are shared between positive and negative series.
  • Prices where profit is positive are included in the positive series only.
  • Prices where profit is negative are included in the negative series only.
• If get_best_range_to_show fails, a default empty GraphData::Series is returned.

graph_config

• Produces a GraphConfig structure for styling and configuring the graph:
  • Title: Based on the strategy’s title via get_title method.
  • Width and height: Predefined dimensions (1600x900).
  • Labels: X-axis represents “Underlying Price”, and Y-axis represents “Profit/Loss”.
  • Other visual configuration properties include:
    • line_style: Set to LineStyle::Solid.
    • color_scheme: Set to default.
    • legend: Title is added to the legend, but show_legend is disabled by default.

Parameters

• $t: One or more types for which the Graph trait should be implemented.

This allows the MyStrategy type to generate graph data and configurations for visual representation of its payoff strategy.

Notes

• The macro assumes that the types implemented provide specific methods (get_best_range_to_show, calculate_profit_at, and get_title) necessary for the Graph trait.
• Predefined values like colors, line widths, and dimensions can be adjusted within the macro if needed.
• The expansion reaches every item it names through $crate paths, so the calling module needs no imports beyond the types it lists.