How fast the speed of this object is changing. Useful for smooth movement and gravity.

If an object is not alive, the game loop will not automatically call update() on it.

Set the angle of a sprite to rotate it. WARNING: rotating sprites decreases rendering performance for this sprite by a factor of 10x!

How fast the spin speed should change.

Like drag but for spinning.

This is how fast you want this sprite to spin.

These store a couple of useful numbers for speeding up collision resolution.

These store a couple of useful numbers for speeding up collision resolution.

Flag for direction collision resolution.

Flag for direction collision resolution.

Flag for direction collision resolution.

Flag for direction collision resolution.

An array of FlxPoint objects. By default contains a single offset (0,0).

These store a couple of useful numbers for speeding up collision resolution.

Handy for tracking gameplay or animations.

This isn't drag exactly, more like deceleration that is only applied when acceleration is not affecting the sprite.

Kind of a global on/off switch for any objects descended from FlxObject.

Internal tracker for whether an object will move/alter position after a collision (see fixed).

Set fixed to true if you want the object to stay in place during collisions. Useful for levels and other environmental objects.

This is a pre-allocated Flash Point object, which is useful for certain Flash graphics API calls

Internal helper used for retro-style flickering.

Internal helper used for retro-style flickering.

Dedicated internal flag for whether or not this class is a FlxGroup.

Handy for storing health percentage or armor points or whatever.

Use in conjunction with angularAcceleration for fluid spin speed control.

Used to cap thrust, helpful and easy!

If you are using acceleration, you can use maxVelocity with it to cap the speed automatically (very useful!).

Set this to false if you want to skip the automatic motion/movement stuff (see updateMotion()). FlxObject and FlxSprite default to true. FlxText, FlxTileblock, FlxTilemap and FlxSound default to false.

Flag that indicates whether or not you just hit the floor. Primarily useful for platformers, this flag is reset during the updateMotion().

WARNING: The origin of the sprite will default to its center. If you change this, the visuals and the collisions will likely be pretty out-of-sync if you do any rotation.

This is just a pre-allocated x-y point container to be used however you like

This is just a pre-allocated rectangle container to be used however you like

A point that can store numbers from 0 to 1 (for X and Y independently) that governs how much this object is affected by the camera subsystem. 0 means it never moves, like a HUD element or far background graphic. 1 means it scrolls along a the same speed as the foreground layer. scrollFactor is initialized as (1,1) by default.

Internal tracker for whether or not the object collides (see solid).

Set solid to true if you want to collide this object.

If you want to do Asteroids style stuff, check out thrust, instead of directly accessing the object's velocity or acceleration.

The basic speed of this object.

If an object is not visible, the game loop will not automatically call render() on it.

Creates a new FlxObject.

If you don't want to call FlxU.collide() you can use this instead. Just calls FlxU.collide(this,Object);. Will collide against itself if Object==null.

Called by FlxGroup, commonly when game states are changed.

Tells this object to flicker, retro-style.

Check to see if the object is still flickering.

Returns the appropriate color for the bounding box depending on object state.

Call this function to figure out the on-screen position of the object.

Called when this object's bottom edge collides with the top of another FlxObject.

Called when this object's left side collides with another FlxObject's right. NOTE: by default this function just calls hitSide().

Called when this object's right side collides with another FlxObject's left. NOTE: by default this function just calls hitSide().

Since most games have identical behavior for running into walls, you can just override this function instead of overriding both hitLeft and hitRight.

Called when this object's top collides with the bottom of another FlxObject.

Call this function to "damage" (or give health bonus) to this sprite.

Call this function to "kill" a sprite so that it no longer 'exists'.

Check and see if this object is currently on screen.

Checks to see if some FlxObject object overlaps this FlxObject object.

Checks to see if a point in 2D space overlaps this FlxObject object.

FlxU.collide() (and thus FlxObject.collide()) call this function each time two objects are compared to see if they collide. It doesn't necessarily mean these objects WILL collide, however.

Called by FlxObject.updateMotion() and some constructors to rebuild the basic collision data for this object.

Override this function to draw graphics (see FlxSprite).

Handy function for reviving game objects. Resets their existence flags and position, including LAST position.

Called by the main game loop, handles motion/physics and game logic

Just updates the retro-style flickering. Considered update logic rather than rendering because it toggles visibility.

Internal function for updating the position and speed of this object. Useful for cases when you need to update this but are buried down in too many supers.

A handy "empty point" object