🏰 FA1 & FA2: SpaceKingdom + Interaction Design

Author: Anika Seksaria

Sprint: 6

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🌌 FA1 — SpaceKingdom Environment

FA1 introduced the OCS GameEngine through SpaceKingdom, an exploration level built around a background and sprite.

Configured Objects

Object	Class	Role
Background	Background	Sky Kingdom sky
Player	Astro	User-controlled character
NPC	Astronaut1	Stationary guide NPC
Barrier	dbarrier_1	Physical collision boundary

Engineering Decisions

• Movement Physics: Set STEP_FACTOR to 1000 to simulate low-gravity movement
• Positioning: Player initialized at (100, 300), NPC at (500, 300) intially
• Scaling: Player SCALE_FACTOR set to 5, NPC set to 4
• Collision Mapping: Barrier set with fromOverlay: true to correctly map the physics layer to the visual overlay (dragon)

Key Code: The Game Loop

// Iteration — updates every object each frame
gameObjects.forEach(obj => {
    obj.update(); // recalculates position using STEP_FACTOR
    obj.draw();   // renders to canvas
});

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🐺 FA2 — Interaction & NPC Design

FA2 added interaction mechanics on top of FA1. I upgraded the static Astronaut1 NPC into an interactive character using proximity-based reactions.

What I Built

• Hitbox: Started at 0.0 as a decorative baseline, then tuned using GameBuilder to create an interaction zone
• Detection: reaction() method triggered when player enters NPC range using a Boolean Expression
• State Management: NPC transitions between idle and interactive states based on player proximity and inventory

Key Code: Detection vs Reaction

// Nested conditions — 3 levels deep
handleCollision(other, direction) {
    if (other.type === "Player") {           // condition: type check
        if (this.distanceTo(other) < 50) {   // nested: proximity check
            if (player.hasItem("basket")) {  
                this.reaction("friendly");
            } else {
                this.reaction("hostile");
            }
        }
    }
}

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📊 Rubric Coverage: FA1 & FA2

CS111 Topic	FA1 Evidence	FA2 Evidence
Numbers	STEP_FACTOR: 1000, SCALE_FACTOR: 5	hitbox.range as Number
Strings	Cloud texture paths	NPC state "friendly" / "hostile"
Booleans	fromOverlay: true	isColliding flag
Arrays	Asset collection lists	gameObjects forEach loop
JSON Objects	Object property literals	NPC configuration object
Mathematical Ops	position += velocity	Distance calculations
Boolean Expressions	if (isColliding && direction)	distanceTo() < range
Iteration	forEach over game objects	map() / filter() for state
Conditions	fromOverlay truthy check	Player type detection
Nested Conditions	Physics mapping logic	Type + range + inventory check
Canvas I/O	draw() 60fps cycle	Real-time coordinate rendering
Classes	Background, Barrier	Wolf/Astro1 extends Character

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Anika Seksaria · CSSE Sprint 6 · Spring 2026 · Mira Costa CS 111 · GameEngine v1.1