SceneDSL Renderer (CMSC 330 Project 1)

This project is a Java-based graphics scene renderer that parses a domain-specific language (DSL) defined in a scene file and displays the specified graphical elements using Java's AWT graphics library.

📚 Project Overview

This project was developed for CMSC 330 - Organization of Programming Languages. It extends a provided Java skeleton to support parsing and rendering of graphical scenes based on an expanded EBNF grammar.

Supported Shapes:

• Right Triangle
• Rectangle
• Isosceles Triangle
• Parallelogram
• Regular Polygon
• Text

The program reads a scene definition file, parses its contents, creates shape objects, and renders the full scene graphically.

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📄 Grammar Specification

scene → SCENE IDENTIFIER number_list images END '.' images → image images | image image → right_triangle | rectangle | parallelogram | regular_polygon | isosceles | text

(Terminals, non-terminals, and formatting follow the original EBNF syntax provided.)

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📂 Project Structure

/src ├── Parser.java # Modified to support new grammar rules ├── Lexer.java # Updated to tokenize new keywords and string literals ├── Tokens.java # Extended with new tokens ├── Text.java # New class for rendering text ├── SolidPolygon.java # New class for regular polygons ├── IsoscelesTriangle.java # New class for isosceles triangles ├── Parallelogram.java # New class for parallelograms ├── RegularPolygon.java # New class for regular polygons └── ... # Other provided and updated skeleton files

🛠️ How to Run

1. Compile all .java files:

   javac *.java
   
   

2. Run the main class (usually Main or similar):

   java Main scene.txt

   Replace scene.txt with your scene definition file.

✅ Test Plan

The program was tested using a variety of scene files that include:

• Single and multiple shapes
• Edge cases for color values and dimensions
• Valid and invalid syntax
• Mixed shape types

Example test file:

Scene Test (500, 500) RightTriangle Color (255, 0, 0) at (50, 30) Height 100 Width 300; Rectangle Color (0, 128, 255) at (100, 100) Height 200 Width 100; Text Color (0, 0, 0) at (400, 200) "Hello World"; End.

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🧠 Lessons Learned

• How to extend a recursive-descent parser
• Working with abstract classes and Java's graphics API
• Designing and implementing new grammar rules
• Handling custom tokens and string parsing

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✍️ Author

Dilen Patel
Project 1: Scene Renderer

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Let me know if you want to include example output images or add GitHub Pages support for a demo!