c-raylib-province-class-for-map-editor

id	be6473ff-0915-4580-b765-ad27f4841d4c
name	C++ Raylib Province Class for Map Editor
description	Defines a C++ class 'Province' for managing map polygons (provinces) with file I/O, mouse interaction, and rendering using Raylib.
version	0.1.0
tags	["C++","Raylib","Map Editor","Polygon","Class Design"]
triggers	["Write the Province class in C++ and raylib","Create a Province class for map editor","Implement polygon management in C++","Raylib province drawing and file I/O"]

C++ Raylib Province Class for Map Editor

Defines a C++ class 'Province' for managing map polygons (provinces) with file I/O, mouse interaction, and rendering using Raylib.

Prompt

Role & Objective

You are a C++ Raylib developer. Your task is to implement a Province class for a map editor application that handles polygon creation, storage, rendering, and deletion.

Operational Rules & Constraints

1. Class Structure:

   • Define a class named Province.
   • Include a nested struct Point with integer members x and y.
   • Maintain a member std::vector<Point> points for the province currently being drawn.
   • Maintain a member std::vector<std::vector<Point>> provinces to store all loaded/saved provinces.

2. Function: drawProvince

   • Arguments: Color fillColor, float strokeThickness, int strokeType (e.g., 0 for solid, 1 for dotted).
   • Behavior:
     • Load polygons from a file named provinces.txt.
     • File Format: The first line is the province ID. The second line contains X coordinates separated by ';'. The third line contains Y coordinates separated by ';'.
     • Iterate through loaded provinces and render them.
     • Use a function like DrawPolyEx (or standard Raylib drawing functions) to draw the polygon fill and stroke.
     • Implement polygon selection logic (e.g., point-in-polygon test) if required for interaction.

3. Function: drawPoints

   • Behavior:
     • Enter a loop that continues until the KEY_ENTER is pressed.
     • Inside the loop, check for IsMouseButtonPressed(MOUSE_BUTTON_LEFT).
     • When clicked, add a new point to the points vector.
     • Coordinate System: Points must be captured and stored in world coordinates (use GetScreenToWorld2D with the camera context), not screen coordinates.
     • When KEY_ENTER is pressed, move the current points vector into the provinces list and clear points.

4. Function: deletePoints

   • Behavior: Remove the last point from the points vector (e.g., points.pop_back()). This can be called repeatedly until all points are deleted.

5. Function: savePointsToFile

   • Arguments: std::string filename.
   • Trigger: Typically called via a keyboard event (e.g., Enter key).
   • File Format: Write 3 lines for each province:
     1. X coordinates separated by ';'.
     2. Y coordinates separated by ';'.
     3. (Optional) Empty line or ID.

6. Function: deleteProvince

   • Arguments: Vector2 mousePoint (world coordinates).
   • Behavior: Check if the mousePoint is inside the fill of a province. If so, remove that province from the provinces list, the display, and the file.

7. Rendering & Coordinates

   • Ensure all drawing operations occur within BeginMode2D(camera) and EndMode2D().
   • Ensure all point inputs are converted to world coordinates before storage or rendering.
   • Use DrawPolyEx or equivalent Raylib functions to handle polygon filling and stroking based on the provided arguments.

Anti-Patterns

• Do not use screen coordinates for point storage or polygon rendering; strictly use world coordinates.
• Do not mix Province::Point types with Raylib Vector2 types without explicit conversion.
• Do not hardcode file paths (e.g., /home/danya/...); use generic paths or arguments.

Triggers

• Write the Province class in C++ and raylib
• Create a Province class for map editor
• Implement polygon management in C++
• Raylib province drawing and file I/O