constants.ts

// All kinds of magic numbers used by the game
// If you want to make some simple tweaks, then here might be the place to start.

const CONST = {
    SCREEN_WIDTH: 1024, 
    SCREEN_HEIGHT: 768,

    // physics sttings
    PLAYER_START_ALTITUDE: 500, //height in pixels where the player spawns
    GRAVITY: 1000,  // Gravity in pixels per second²
    EXPLOSION_FORCE: 30000000, // impulse caused by rocket explosions
    EXPLOSION_MIN_RADIUS: 128, //radius in pixels from within the maximum explosion force is applied
    EXPLOSION_MAX_RADIUS: 640, //radius in pixels from without explosions are completely ignored
    PLAYER_GROUND_COLLISION: -46, //distance in pixels between player center of mass and feet
    PLAYER_ACCEL_GROUND: 0, // player acceleration on ground
    PLAYER_FRICTION_GROUND: 0.999, // fraction of speed the player loses per second while grounded
    PLAYER_ACCEL_AIR: 1000, // player acceleration while airborne
    PLAYER_FRICTION_AIR: 0.5, // fraction of speed the player loses per second while airborne
    PLAYER_GROUND_BOUNCE: 0.75, // how much the player bounces when impacting the ground
    ROCKET_VELOCITY: 1000, // speed of rockets in pixels per second
    ROCKET_START_HEIGHT: 25, // hight at the player sprite where rockets are spawned
    ROCKET_SHOOTING_COOLDOWN: 0.5, // time in seconds between shooting rockets 
    EXPLOSION_FX_LIFETIME: 0.5, // lifetime of explosions in seconds

    // camera settings
    CAMERA_LEAD: 0.25,       // distance the camera leads ahead in direction of player trajectory
    CAMERA_AGILITY: 1.5,    // how fast the camera reacts to changes in direction

    // UI settings
    RECORD_SHOW_DURATION: 5,  // seconds a record stays on screen

    // mob properties
    MOB_BALLOON_RADIUS: 48, // radius of the collision hitcircle
    MOB_BIRD_RADIUS: 45, // radius of the collision hitcircle
    MOB_BIRD_ANIMATION_LENGHT: 0.2, // time for one animation cycle of the birds
    MOB_BIRD_MOVE_RANGE: 400,   // movement range of bird mobs
    MOB_BIRD_MOVE_TIME: 10, // time it takes for the bird to move through its range
    MOB_UFO_RADIUS: 55, // radius of the collision hitcircle
    MOB_UFO_ANIMATION_LENGHT: 0.2, // time for one animation cycle of the ufo
    MOB_UFO_MOVE_RANGE_X: 600,
    MOB_UFO_MOVE_TIME_X: 12,
    MOB_UFO_MOVE_RANGE_Y: 200,
    MOB_UFO_MOVE_TIME_Y: 4,


    // render order layers
    LAYER_BG: -1,
    LAYER_MOBS: 0,
    LAYER_PLAYER_BG: 1,
    LAYER_PLAYER_FG: 2,
    LAYER_FX: 3,
    LAYER_UI: 4,
    LAYER_XHAIR: 5,

    // now it gets technical
    DEBUG_SHOW_COLLIDERS: false,
    CHUNK_WIDTH: 500, // width of an area where objects spawn / despawn
    CHUNK_NUMBER: 3, // number of chunks in each direction
    METER: 40 // pixels per meter
}