Constructor
new Endboss()
Initializes the Endboss by:
- Loading all animation sequences into the image cache.
- Setting the default displayed image to the first alert frame.
- Applying gravity.
- Setting the starting horizontal position to x = 3800.
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Members
IMAGES_ALERT :Array.<string>
Image paths for the alert animation sequence.
Type:
- Array.<string>
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IMAGES_ATTACK :Array.<string>
Image paths for the attack animation sequence.
Includes repeated frames for visual emphasis.
Type:
- Array.<string>
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IMAGES_DEAD :Array.<string>
Image paths for the death animation sequence.
Includes frames shared with the hurt animation and dedicated death frames.
Type:
- Array.<string>
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IMAGES_FLYING :Array.<string>
Image paths for the flying animation sequence during recovery.
Type:
- Array.<string>
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IMAGES_HURT :Array.<string>
Image paths for the hurt animation sequence.
Type:
- Array.<string>
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IMAGES_INTRO2 :Array.<string>
Image paths for the alert animation intro sequence.
Type:
- Array.<string>
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IMAGES_LANDING :Array.<string>
Image paths for the landing animation sequence after flight or attack.
Type:
- Array.<string>
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IMAGES_PREPARE :Array.<string>
Image paths for the prepare animation sequence.
Shown before the boss initiates an attack.
Type:
- Array.<string>
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IMAGES_WALKING :Array.<string>
Image paths for the walking animation.
Type:
- Array.<string>
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acceleration :number
Vertical acceleration applied to the character (simulates gravity).
Type:
- number
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attackStart :number
Timestamp when the boss started attacking (ms since epoch).
Type:
- number
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blinkIntervalMs :number
Interval between blink toggles in milliseconds.
Type:
- number
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blinkOn :boolean
Current on/off state for the vulnerable blink overlay.
Type:
- boolean
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canTakeDamage :boolean
Whether the boss can currently take damage.
Used to implement invulnerability phases.
Type:
- boolean
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damage :number
Amount of damage the boss deals.
Type:
- number
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frameDelay :Object
Frame delays for each animation state of the boss.
Includes: dead, hurt, alert, prepare, attack, flying, landing, walking, intro1.
Type:
- Object
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hasJumpedThisAttack :boolean
One-shot flag to ensure jump during attack happens only once.
Type:
- boolean
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hasRecentlyAttacked :boolean
Cooldown flag: prevents immediately starting a new attack after the last one.
Type:
- boolean
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hasRecentlyRetreated :boolean
Cooldown flag: prevents immediately retreating after the last retreat.
Type:
- boolean
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hasRecentlySpawned :boolean
Cooldown flag: prevents immediately spawning new minions after the last spawn.
Type:
- boolean
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health :number
Current health of the boss.
Type:
- number
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height :number
Height of the boss sprite.
Type:
- number
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introStart :number
Timestamp when the boss intro sequence started (ms since epoch).
Type:
- number
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isAllowedToWalk :boolean
Whether free walking between minX/maxX is allowed (outside attack/recover locks).
Type:
- boolean
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isAttacking :boolean
Whether the boss is currently in the attack sequence (locked until it ends).
Type:
- boolean
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isRecovering :boolean
Whether the boss is currently in the recover sequence (locked until it ends).
Type:
- boolean
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lastBlinkToggleAt :number
Timestamp of the last blink toggle (ms since epoch).
Type:
- number
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maxX :number
Right boundary of the boss's allowed horizontal movement range.
This value is set dynamically based on the level's end position.
Type:
- number
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minX :number
Left boundary of the boss's allowed horizontal movement range.
Type:
- number
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offset :Object
Hitbox offset values to adjust collision detection.
Type:
- Object
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prepareStart :number
Timestamp when the boss entered the "prepare" state (ms since epoch).
Type:
- number
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recoverStart :number
Timestamp when the boss started recovering (ms since epoch).
Type:
- number
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retreatStart :number
Timestamp when boss starts retreating (ms since epoch).
Type:
- number
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spawningStart :number
Timestamp when boss starts spawning minion chickens (ms since epoch).
Type:
- number
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speed :number
Movement speed of the boss.
Type:
- number
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width :number
Width of the boss sprite.
Type:
- number
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world :World
Reference to the world object containing game entities.
Type:
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x :number
Horizontal starting position of the boss in the level.
Type:
- number
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y :number
Vertical position of the boss.
Type:
- number
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Methods
draw(ctx)
Draws the boss on the provided 2D canvas context.
Updates visual effects based on state (hurt/vulnerable) and timing.
Animation updates are synchronized with frame timing.
Parameters:
| Name | Type | Description |
|---|---|---|
ctx |
CanvasRenderingContext2D | The 2D rendering context. |
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drawHurtIndicator(ctx)
Renders the boss with a hue-rotated filter to indicate the hurt state.
Parameters:
| Name | Type | Description |
|---|---|---|
ctx |
CanvasRenderingContext2D | The 2D rendering context. |
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drawVulnerableIndicator(ctx, now)
Renders the boss with a timed grayscale/saturation blink effect
to indicate the vulnerable state.
Parameters:
| Name | Type | Description |
|---|---|---|
ctx |
CanvasRenderingContext2D | The 2D rendering context. |
now |
number | Current timestamp in milliseconds. |
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initEndbossLoops()
Initializes the boss's physics and animation systems.
Sets up gravity effects synchronized with display refresh rate.
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setMaxX()
Updates `maxX` to match the level's end boundary minus a fixed offset
to account for boss sprite width and positioning.
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setWorld(world)
Assigns the current game world to the boss.
Also recalculates the maximum allowed horizontal position (`maxX`)
based on the level's end boundary.
Parameters:
| Name | Type | Description |
|---|---|---|
world |
World | Reference to the active game world instance. |
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