org.flixel.FlxObject Maven / Gradle / Ivy
The newest version!
package org.flixel;
import org.flixel.event.IFlxObject;
import com.badlogic.gdx.utils.Array;
import flash.display.Graphics;
/**
* This is the base class for most of the display objects (FlxSprite, FlxText, etc).
* It includes some basic attributes about game objects, including retro-style flickering,
* basic state information, sizes, scrolling, and basic physics and motion.
*
* @author Ka Wing Chin
* @author Thomas Weston
*/
public class FlxObject extends FlxBasic
{
/**
* Generic value for "left" Used by facing, allowCollisions, and touching.
*/
static public final int LEFT = 0x000100;
/**
* Generic value for "right" Used by facing, allowCollisions, and touching.
*/
static public final int RIGHT = 0x001000;
/**
* Generic value for "up" Used by facing, allowCollisions, and touching.
*/
static public final int UP = 0x010000;
/**
* Generic value for "down" Used by facing, allowCollisions, and touching.
*/
static public final int DOWN = 0x100000;
/**
* Special-case constant meaning no collisions, used mainly by allowCollisions and touching.
*/
static public final int NONE = 0;
/**
* Special-case constant meaning up, used mainly by allowCollisions and touching.
*/
static public final int CEILING = UP;
/**
* Special-case constant meaning down, used mainly by allowCollisions and touching.
*/
static public final int FLOOR = DOWN;
/**
* Special-case constant meaning only the left and right sides, used mainly by allowCollisions and touching.
*/
static public final int WALL = LEFT | RIGHT;
/**
* Special-case constant meaning any direction, used mainly by allowCollisions and touching.
*/
static public final int ANY = LEFT | RIGHT | UP | DOWN;
/**
* Handy constant used during collision resolution (see separateX() and separateY()).
*/
static public final float OVERLAP_BIAS = 4;
/**
* Path behavior controls: move from the start of the path to the end then stop.
*/
static public final int PATH_FORWARD = 0x000000;
/**
* Path behavior controls: move from the end of the path to the start then stop.
*/
static public final int PATH_BACKWARD = 0x000001;
/**
* Path behavior controls: move from the start of the path to the end then directly back to the start, and start over.
*/
static public final int PATH_LOOP_FORWARD = 0x000010;
/**
* Path behavior controls: move from the end of the path to the start then directly back to the end, and start over.
*/
static public final int PATH_LOOP_BACKWARD = 0x000100;
/**
* Path behavior controls: move from the start of the path to the end then turn around and go back to the start, over and over.
*/
static public final int PATH_YOYO = 0x001000;
/**
* Path behavior controls: ignores any vertical component to the path data, only follows side to side.
*/
static public final int PATH_HORIZONTAL_ONLY = 0x010000;
/**
* Path behavior controls: ignores any horizontal component to the path data, only follows up and down.
*/
static public final int PATH_VERTICAL_ONLY = 0x100000;
/**
* X position of the upper left corner of this object in world space.
*/
public float x;
/**
* Y position of the upper left corner of this object in world space.
*/
public float y;
/**
* The width of this object.
*/
public float width;
/**
* The height of this object.
*/
public float height;
/**
* Whether an object will move/alter position after a collision.
*/
public boolean immovable;
/**
* The basic speed of this object.
*/
public FlxPoint velocity;
/**
* The virtual mass of the object. Default value is 1.
* Currently only used with elasticity during collision resolution.
* Change at your own risk; effects seem crazy unpredictable so far!
*/
public float mass;
/**
* The bounciness of this object. Only affects collisions. Default value is 0, or "not bouncy at all."
*/
public float elasticity;
/**
* How fast the speed of this object is changing.
* Useful for smooth movement and gravity.
*/
public FlxPoint acceleration;
/**
* This isn't drag exactly, more like deceleration that is only applied
* when acceleration is not affecting the sprite.
*/
public FlxPoint drag;
/**
* If you are using acceleration, you can use maxVelocity with it
* to cap the speed automatically (very useful!).
*/
public FlxPoint maxVelocity;
/**
* Set the angle of a sprite to rotate it.
* WARNING: rotating sprites decreases rendering
* performance for this sprite by a factor of 10x!
*/
public float angle;
/**
* This is how fast you want this sprite to spin.
*/
public float angularVelocity;
/**
* How fast the spin speed should change.
*/
public float angularAcceleration;
/**
* Like drag but for spinning.
*/
public float angularDrag;
/**
* Use in conjunction with angularAcceleration for fluid spin speed control.
*/
public float maxAngular;
/**
* Should always represent (0,0) - useful for different things, for avoiding unnecessary new calls.
*/
static protected final FlxPoint _pZero = new FlxPoint();
/**
* 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.
*/
public FlxPoint scrollFactor;
/**
* Internal helper used for retro-style flickering.
*/
protected boolean _flicker;
/**
* Internal helper used for retro-style flickering.
*/
protected float _flickerTimer;
/**
* Handy for storing health percentage or armor points or whatever.
*/
public float health;
/**
* This is just a pre-allocated x-y point container to be used however you like
*/
protected FlxPoint _point;
/**
* This is just a pre-allocated rectangle container to be used however you like
*/
protected FlxRect _rect;
/**
* Set this to false if you want to skip the automatic motion/movement stuff (see updateMotion()).
* FlxObject, FlxSprite and FlxText default to true.
* FlxTileblock and FlxTilemap default to false.
*/
public boolean moves;
/**
* Bit field of flags (use with UP, DOWN, LEFT, RIGHT, etc) indicating surface contacts.
* Use bitwise operators to check the values stored here, or use touching(), justStartedTouching(), etc.
* You can even use them broadly as boolean values if you're feeling saucy!
*/
public int touching;
/**
* Bit field of flags (use with UP, DOWN, LEFT, RIGHT, etc) indicating surface contacts from the previous game loop step.
* Use bitwise operators to check the values stored here, or use touching(), justStartedTouching(), etc.
* You can even use them broadly as boolean values if you're feeling saucy!
*/
public int wasTouching;
/**
* Bit field of flags (use with UP, DOWN, LEFT, RIGHT, etc) indicating collision directions.
* Use bitwise operators to check the values stored here.
* Useful for things like one-way platforms (e.g. allowCollisions = UP;)
* The accessor "solid" just flips this variable between NONE and ANY.
*/
public int allowCollisions;
/**
* Important variable for collision processing.
* By default this value is set automatically during preUpdate().
*/
public FlxPoint last;
/**
* A reference to a path object. Null by default, assigned by followPath().
*/
public FlxPath path;
/**
* The speed at which the object is moving on the path.
* When an object completes a non-looping path circuit,
* the pathSpeed will be zeroed out, but the path reference
* will NOT be nulled out. So pathSpeed is a good way
* to check if this object is currently following a path or not.
*/
public float pathSpeed;
/**
* The angle in degrees between this object and the next node, where 0 is
* directly upward, and 90 is to the right.
*/
public float pathAngle;
/**
* Internal helper, tracks which node of the path this object is moving toward.
*/
protected int _pathNodeIndex;
/**
* Internal tracker for path behavior flags (like looping, horizontal only, etc).
*/
protected int _pathMode;
/**
* Internal helper for node navigation, specifically yo-yo and backwards movement.
*/
protected int _pathInc;
/**
* Internal flag for whether the object's angle should be adjusted to the path angle during path follow behavior.
*/
protected boolean _pathRotate;
/**
* Instantiates a FlxObject.
*
* @param X The X-coordinate of the point in space.
* @param Y The Y-coordinate of the point in space.
* @param Width Desired width of the rectangle.
* @param Height Desired height of the rectangle.
*/
public FlxObject(float X,float Y,int Width,int Height)
{
x = X;
y = Y;
last = new FlxPoint(x,y);
width = Width;
height = Height;
mass = 1.0f;
elasticity = 0.0f;
health = 1;
immovable = false;
moves = true;
touching = NONE;
wasTouching = NONE;
allowCollisions = ANY;
velocity = new FlxPoint();
acceleration = new FlxPoint();
drag = new FlxPoint();
maxVelocity = new FlxPoint(10000,10000);
angle = 0;
angularVelocity = 0;
angularAcceleration = 0;
angularDrag = 0;
maxAngular = 10000;
scrollFactor = new FlxPoint(1.0f,1.0f);
_flicker = false;
_flickerTimer = 0;
_point = new FlxPoint();
_rect = new FlxRect();
path = null;
pathSpeed = 0;
pathAngle = 0;
}
/**
* Instantiates a FlxObject.
*
* @param X The X-coordinate of the point in space.
* @param Y The Y-coordinate of the point in space.
* @param Width Desired width of the rectangle.
*/
public FlxObject(float X,float Y,int Width)
{
this(X,Y,Width,0);
}
/**
* Instantiates a FlxObject.
*
* @param X The X-coordinate of the point in space.
* @param Y The Y-coordinate of the point in space.
*/
public FlxObject(float X,float Y)
{
this(X,Y,0,0);
}
/**
* Instantiates a FlxObject.
*
* @param X The X-coordinate of the point in space.
*/
public FlxObject(float X)
{
this(X,0,0,0);
}
/**
* Instantiates a FlxObject.
*/
public FlxObject()
{
this(0,0,0,0);
}
/**
* Override this function to null out variables or
* manually call destroy() on class members if necessary.
* Don't forget to call super.destroy()!
*/
@Override
public void destroy()
{
velocity = null;
acceleration = null;
drag = null;
maxVelocity = null;
scrollFactor = null;
_point = null;
_rect = null;
last = null;
cameras = null;
if(path != null)
path.destroy();
path = null;
}
/**
* Pre-update is called right before update() on each object in the game loop.
* In FlxObject it controls the flicker timer,
* tracking the last coordinates for collision purposes,
* and checking if the object is moving along a path or not.
*/
@Override
public void preUpdate()
{
_ACTIVECOUNT++;
if(_flickerTimer != 0)
{
_flicker = !_flicker;
if(_flickerTimer > 0)
{
_flickerTimer = _flickerTimer - FlxG.elapsed;
if(_flickerTimer <= 0)
{
_flickerTimer = 0;
_flicker = false;
}
}
}
last.x = x;
last.y = y;
if((path != null) && (pathSpeed != 0) && (path.nodes.get(_pathNodeIndex) != null))
updatePathMotion();
}
/**
* Post-update is called right after update() on each object in the game loop.
* In FlxObject this function handles integrating the objects motion
* based on the velocity and acceleration settings, and tracking/clearing the touching flags.
*/
@Override
public void postUpdate()
{
if(moves)
updateMotion();
wasTouching = touching;
touching = NONE;
}
/**
* 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.
* Does a slightly fancier-than-normal integration to help with higher fidelity framerate-independenct motion.
*/
protected void updateMotion()
{
float delta;
float velocityDelta;
velocityDelta = (FlxU.computeVelocity(angularVelocity,angularAcceleration,angularDrag,maxAngular) - angularVelocity)/2f;
angularVelocity += velocityDelta;
angle += angularVelocity*FlxG.elapsed;
angularVelocity += velocityDelta;
velocityDelta = (FlxU.computeVelocity(velocity.x,acceleration.x,drag.x,maxVelocity.x) - velocity.x)/2f;
velocity.x += velocityDelta;
delta = velocity.x*FlxG.elapsed;
velocity.x += velocityDelta;
x += delta;
velocityDelta = (FlxU.computeVelocity(velocity.y,acceleration.y,drag.y,maxVelocity.y) - velocity.y)/2f;
velocity.y += velocityDelta;
delta = velocity.y*FlxG.elapsed;
velocity.y += velocityDelta;
y += delta;
}
/**
* Rarely called, and in this case just increments the visible objects count and calls drawDebug() if necessary.
*/
@Override
public void draw()
{
FlxCamera camera = FlxG._activeCamera;
if(cameras == null)
cameras = FlxG.cameras;
if(!cameras.contains(camera, true))
return;
if(!onScreen(camera))
return;
_VISIBLECOUNT++;
if(FlxG.visualDebug && !ignoreDrawDebug)
drawDebug(camera);
}
/**
* Override this function to draw custom "debug mode" graphics to the
* specified camera while the debugger's visual mode is toggled on.
*
* @param Camera Which camera to draw the debug visuals to.
*/
@Override
public void drawDebug(FlxCamera Camera)
{
if(Camera == null)
Camera = FlxG.camera;
//get bounding box coordinates
float boundingBoxX = x - (Camera.scroll.x*scrollFactor.x); //copied from getScreenXY()
float boundingBoxY = y - (Camera.scroll.y*scrollFactor.y);
boundingBoxX = (boundingBoxX + ((boundingBoxX > 0)?0.0000001f:-0.0000001f));
boundingBoxY = (boundingBoxY + ((boundingBoxY > 0)?0.0000001f:-0.0000001f));
int boundingBoxWidth = (int)((width != (int)width)?width:width-1);
int boundingBoxHeight = (int)((height != (int)height)?height:height-1);
//fill static graphics object with square shape
Graphics gfx = FlxG.flashGfx;
int boundingBoxColor;
if(allowCollisions > 0)
{
if(allowCollisions != ANY)
boundingBoxColor = FlxG.PINK;
if(immovable)
boundingBoxColor = FlxG.GREEN;
else
boundingBoxColor = FlxG.RED;
}
else
boundingBoxColor = FlxG.BLUE;
gfx.lineStyle(1f,boundingBoxColor,0.5f);
gfx.drawRect(boundingBoxX, boundingBoxY, boundingBoxWidth, boundingBoxHeight);
}
/**
* Call this function to give this object a path to follow.
* If the path does not have at least one node in it, this function
* will log a warning message and return.
*
* @param Path The FlxPath you want this object to follow.
* @param Speed How fast to travel along the path in pixels per second.
* @param Mode Optional, controls the behavior of the object following the path using the path behavior constants. Can use multiple flags at once, for example PATH_YOYO|PATH_HORIZONTAL_ONLY will make a object move back and forth along the X axis of the path only.
* @param AutoRotate Automatically point the object toward the next node. Assumes the graphic is pointing upward. Default behavior is false, or no automatic rotation.
*/
public void followPath(FlxPath Path,float Speed,int Mode,boolean AutoRotate)
{
if(Path == null || Path.nodes.size <= 0)
{
FlxG.log("WARNING: Paths need at least one node in them to be followed.");
return;
}
path = Path;
pathSpeed = FlxU.abs(Speed);
_pathMode = Mode;
_pathRotate = AutoRotate;
//get starting node
if((_pathMode == PATH_BACKWARD) || (_pathMode == PATH_LOOP_BACKWARD))
{
_pathNodeIndex = path.nodes.size - 1;
_pathInc = -1;
}
else
{
_pathNodeIndex = 0;
_pathInc = 1;
}
}
/**
* Call this function to give this object a path to follow.
* If the path does not have at least one node in it, this function
* will log a warning message and return.
*
* @param Path The FlxPath you want this object to follow.
* @param Speed How fast to travel along the path in pixels per second.
* @param Mode Optional, controls the behavior of the object following the path using the path behavior constants. Can use multiple flags at once, for example PATH_YOYO|PATH_HORIZONTAL_ONLY will make a object move back and forth along the X axis of the path only.
*/
public void followPath(FlxPath Path,float Speed,int Mode)
{
followPath(Path,Speed,Mode,false);
}
/**
* Call this function to give this object a path to follow.
* If the path does not have at least one node in it, this function
* will log a warning message and return.
*
* @param Path The FlxPath you want this object to follow.
* @param Speed How fast to travel along the path in pixels per second.
*/
public void followPath(FlxPath Path,float Speed)
{
followPath(Path,Speed,PATH_FORWARD,false);
}
/**
* Call this function to give this object a path to follow.
* If the path does not have at least one node in it, this function
* will log a warning message and return.
*
* @param Path The FlxPath you want this object to follow.
*/
public void followPath(FlxPath Path)
{
followPath(Path,100,PATH_FORWARD,false);
}
/**
* Tells this object to stop following the path its on.
*
* @param DestroyPath Tells this function whether to call destroy on the path object. Default value is false.
*/
public void stopFollowingPath(boolean DestroyPath)
{
pathSpeed = 0;
velocity.x = 0;
velocity.y = 0;
if(DestroyPath && (path != null))
{
path.destroy();
path = null;
}
}
/**
* Tells this object to stop following the path its on.
*/
public void stopFollowingPath()
{
stopFollowingPath(false);
}
/**
* Internal function that decides what node in the path to aim for next based on the behavior flags.
*
* @return The node (a FlxPoint object) we are aiming for next.
*/
protected FlxPoint advancePath(boolean Snap)
{
if(Snap)
{
FlxPoint oldNode = path.nodes.get(_pathNodeIndex);
if(oldNode != null)
{
if((_pathMode & PATH_VERTICAL_ONLY) == 0)
x = oldNode.x - width*0.5f;
if((_pathMode & PATH_HORIZONTAL_ONLY) == 0)
y = oldNode.y - height*0.5f;
}
}
_pathNodeIndex += _pathInc;
if((_pathMode & PATH_BACKWARD) > 0)
{
if(_pathNodeIndex < 0)
{
_pathNodeIndex = 0;
stopFollowingPath(false);
}
}
else if((_pathMode & PATH_LOOP_FORWARD) > 0)
{
if(_pathNodeIndex >= path.nodes.size)
_pathNodeIndex = 0;
}
else if((_pathMode & PATH_LOOP_BACKWARD) > 0)
{
if(_pathNodeIndex < 0)
{
_pathNodeIndex = path.nodes.size - 1;
if(_pathNodeIndex < 0)
_pathNodeIndex = 0;
}
}
else if((_pathMode & PATH_YOYO) > 0)
{
if(_pathInc > 0)
{
if(_pathNodeIndex >= path.nodes.size)
{
_pathNodeIndex = path.nodes.size - 2;
if(_pathNodeIndex < 0)
_pathNodeIndex = 0;
_pathInc = -_pathInc;
}
}
else if(_pathNodeIndex < 0)
{
_pathNodeIndex = 1;
if(_pathNodeIndex >= path.nodes.size)
_pathNodeIndex = path.nodes.size - 1;
if(_pathNodeIndex < 0)
_pathNodeIndex = 0;
_pathInc = -_pathInc;
}
}
else
{
if(_pathNodeIndex >= path.nodes.size)
{
_pathNodeIndex = path.nodes.size - 1;
stopFollowingPath(false);
}
}
return path.nodes.get(_pathNodeIndex);
}
/**
* Internal function that decides what node in the path to aim for next based on the behavior flags.
*
* @return The node (a FlxPoint object) we are aiming for next.
*/
protected FlxPoint advancePath()
{
return advancePath(true);
}
/**
* Internal function for moving the object along the path.
* Generally this function is called automatically by preUpdate().
* The first half of the function decides if the object can advance to the next node in the path,
* while the second half handles actually picking a velocity toward the next node.
*/
protected void updatePathMotion()
{
//first check if we need to be pointing at the next node yet
_point.x = x + width*0.5f;
_point.y = y + height*0.5f;
FlxPoint node = path.nodes.get(_pathNodeIndex);
float deltaX = node.x - _point.x;
float deltaY = node.y - _point.y;
boolean horizontalOnly = (_pathMode & PATH_HORIZONTAL_ONLY) > 0;
boolean verticalOnly = (_pathMode & PATH_VERTICAL_ONLY) > 0;
if(horizontalOnly)
{
if(((deltaX>0)?deltaX:-deltaX) < pathSpeed*FlxG.elapsed)
node = advancePath();
}
else if(verticalOnly)
{
if(((deltaY>0)?deltaY:-deltaY) < pathSpeed*FlxG.elapsed)
node = advancePath();
}
else
{
if(Math.sqrt(deltaX*deltaX + deltaY*deltaY) < pathSpeed*FlxG.elapsed)
node = advancePath();
}
//then just move toward the current node at the requested speed
if(pathSpeed != 0)
{
//set velocity based on path mode
_point.x = x + width*0.5f;
_point.y = y + height*0.5f;
if(horizontalOnly || (_point.y == node.y))
{
velocity.x = (_point.x < node.x)?pathSpeed:-pathSpeed;
if(velocity.x < 0)
pathAngle = -90;
else
pathAngle = 90;
if(!horizontalOnly)
velocity.y = 0;
}
else if(verticalOnly || (_point.x == node.x))
{
velocity.y = (_point.y < node.y)?pathSpeed:-pathSpeed;
if(velocity.y < 0)
pathAngle = 0;
else
pathAngle = 180;
if(!verticalOnly)
velocity.x = 0;
}
else
{
pathAngle = FlxU.getAngle(_point,node);
FlxU.rotatePoint(0,pathSpeed,0,0,pathAngle,velocity);
}
//then set object rotation if necessary
if(_pathRotate)
{
angularVelocity = 0;
angularAcceleration = 0;
angle = pathAngle;
}
}
}
/**
* Checks to see if some FlxObject or FlxGroup overlaps this FlxObject.
* If the group has a LOT of things in it, it might be faster to use FlxG.overlaps().
* WARNING: Currently tilemaps do NOT support screen space overlap checks!
*
* @param ObjectOrGroup The object or group being tested.
* @param InScreenSpace Whether to take scroll factors into account when checking for overlap. Default is false, or "only compare in world space."
* @param Camera Specify which game camera you want. If null getScreenXY() will just grab the first global camera.
*
* @return Whether or not the two objects overlap.
*/
public boolean overlaps(FlxBasic ObjectOrGroup,boolean InScreenSpace,FlxCamera Camera)
{
if(ObjectOrGroup instanceof FlxGroup)
{
boolean results = false;
int i = 0;
Array members = ((FlxGroup)ObjectOrGroup).members;
int length = ((FlxGroup)ObjectOrGroup).length;
while(i < length)
{
if(overlaps(members.get(i++),InScreenSpace,Camera))
results = true;
}
return results;
}
if(ObjectOrGroup instanceof FlxTilemap)
{
//Since tilemap's have to be the caller, not the target, to do proper tile-based collisions,
// we redirect the call to the tilemap overlap here.
return ((FlxTilemap) ObjectOrGroup).overlaps(this,InScreenSpace,Camera);
}
FlxObject object = (FlxObject) ObjectOrGroup;
if(!InScreenSpace)
{
return (object.x + object.width > x) && (object.x < x + width) &&
(object.y + object.height > y) && (object.y < y + height);
}
if(Camera == null)
Camera = FlxG.camera;
FlxPoint objectScreenPos = object.getScreenXY(null,Camera);
getScreenXY(_point,Camera);
return (objectScreenPos.x + object.width > _point.x) && (objectScreenPos.x < _point.x + width) &&
(objectScreenPos.y + object.height > _point.y) && (objectScreenPos.y < _point.y + height);
}
/**
* Checks to see if some FlxObject or FlxGroup overlaps this FlxObject.
* If the group has a LOT of things in it, it might be faster to use FlxG.overlaps().
* WARNING: Currently tilemaps do NOT support screen space overlap checks!
*
* @param ObjectOrGroup The object or group being tested.
* @param InScreenSpace Whether to take scroll factors into account when checking for overlap. Default is false, or "only compare in world space."
*
* @return Whether or not the two objects overlap.
*/
public boolean overlaps(FlxBasic ObjectOrGroup,boolean InScreenSpace)
{
return overlaps(ObjectOrGroup,InScreenSpace,null);
}
/**
* Checks to see if some FlxObject or FlxGroup overlaps this FlxObject.
* If the group has a LOT of things in it, it might be faster to use FlxG.overlaps().
* WARNING: Currently tilemaps do NOT support screen space overlap checks!
*
* @param ObjectOrGroup The object or group being tested.
*
* @return Whether or not the two objects overlap.
*/
public boolean overlaps(FlxBasic ObjectOrGroup)
{
return overlaps(ObjectOrGroup,false,null);
}
/**
* Checks to see if this FlxObject were located at the given position, would it overlap the FlxObject or FlxGroup?
* This is distinct from overlapsPoint(), which just checks that point, rather than taking the object's size into account.
* WARNING: Currently tilemaps do NOT support screen space overlap checks!
*
* @param X The X position you want to check. Pretends this object (the caller, not the parameter) is located here.
* @param Y The Y position you want to check. Pretends this object (the caller, not the parameter) is located here.
* @param ObjectOrGroup The object or group being tested.
* @param InScreenSpace Whether to take scroll factors into account when checking for overlap. Default is false, or "only compare in world space."
* @param Camera Specify which game camera you want. If null getScreenXY() will just grab the first global camera.
*
* @return Whether or not the two objects overlap.
*/
public boolean overlapsAt(float X,float Y,FlxBasic ObjectOrGroup,boolean InScreenSpace,FlxCamera Camera)
{
if(ObjectOrGroup instanceof FlxGroup)
{
boolean results = false;
int i = 0;
Array members = ((FlxGroup)ObjectOrGroup).members;
int length = ((FlxGroup)ObjectOrGroup).length;
while(i < length)
{
if(overlapsAt(X,Y,members.get(i++),InScreenSpace,Camera))
results = true;
}
return results;
}
if(ObjectOrGroup instanceof FlxTilemap)
{
//Since tilemap's have to be the caller, not the target, to do proper tile-based collisions,
// we redirect the call to the tilemap overlap here.
//However, since this is overlapsAt(), we also have to invent the appropriate position for the tilemap.
//So we calculate the offset between the player and the requested position, and subtract that from the tilemap.
FlxTilemap tilemap = (FlxTilemap) ObjectOrGroup;
return tilemap.overlapsAt(tilemap.x - (X - x), tilemap.y - (Y - y),this,InScreenSpace,Camera);
}
FlxObject object = (FlxObject) ObjectOrGroup;
if(!InScreenSpace)
{
return (object.x + object.width > X) && (object.x < X + width) &&
(object.y + object.height > Y) && (object.y < Y + height);
}
if(Camera == null)
Camera = FlxG.camera;
FlxPoint objectScreenPos = object.getScreenXY(null,Camera);
_point.x = X - (Camera.scroll.x*scrollFactor.x); //copied from getScreenXY()
_point.y = Y - (Camera.scroll.y*scrollFactor.y);
_point.x += (_point.x > 0)?0.0000001f:-0.0000001f;
_point.y += (_point.y > 0)?0.0000001f:-0.0000001f;
return (objectScreenPos.x + object.width > _point.x) && (objectScreenPos.x < _point.x + width) &&
(objectScreenPos.y + object.height > _point.y) && (objectScreenPos.y < _point.y + height);
}
/**
* Checks to see if this FlxObject were located at the given position, would it overlap the FlxObject or FlxGroup?
* This is distinct from overlapsPoint(), which just checks that point, rather than taking the object's size into account.
* WARNING: Currently tilemaps do NOT support screen space overlap checks!
*
* @param X The X position you want to check. Pretends this object (the caller, not the parameter) is located here.
* @param Y The Y position you want to check. Pretends this object (the caller, not the parameter) is located here.
* @param ObjectOrGroup The object or group being tested.
* @param InScreenSpace Whether to take scroll factors into account when checking for overlap. Default is false, or "only compare in world space."
*
* @return Whether or not the two objects overlap.
*/
public boolean overlapsAt(float X,float Y,FlxBasic ObjectOrGroup,boolean InScreenSpace)
{
return overlapsAt(X,Y,ObjectOrGroup,InScreenSpace,null);
}
/**
* Checks to see if this FlxObject were located at the given position, would it overlap the FlxObject or FlxGroup?
* This is distinct from overlapsPoint(), which just checks that point, rather than taking the object's size into account.
* WARNING: Currently tilemaps do NOT support screen space overlap checks!
*
* @param X The X position you want to check. Pretends this object (the caller, not the parameter) is located here.
* @param Y The Y position you want to check. Pretends this object (the caller, not the parameter) is located here.
* @param ObjectOrGroup The object or group being tested.
*
* @return Whether or not the two objects overlap.
*/
public boolean overlapsAt(float X,float Y,FlxBasic ObjectOrGroup)
{
return overlapsAt(X,Y,ObjectOrGroup,false,null);
}
/**
* Checks to see if a point in 2D world space overlaps this FlxObject object.
*
* @param Point The point in world space you want to check.
* @param InScreenSpace Whether to take scroll factors into account when checking for overlap.
* @param Camera Specify which game camera you want. If null getScreenXY() will just grab the first global camera.
*
* @return Whether or not the point overlaps this object.
*/
public boolean overlapsPoint(FlxPoint Point,boolean InScreenSpace,FlxCamera Camera)
{
if(!InScreenSpace)
return (Point.x > x) && (Point.x < (x + width)) && (Point.y > y) && (Point.y < (y + height));
if(Camera == null)
Camera = FlxG.camera;
float X = Point.x - Camera.scroll.x;
float Y = Point.y - Camera.scroll.y;
getScreenXY(_point,Camera);
return (X > _point.x) && (X < _point.x + width) && (Y > _point.y) && (Y < _point.y + height);
}
/**
* Checks to see if a point in 2D world space overlaps this FlxObject object.
*
* @param Point The point in world space you want to check.
* @param InScreenSpace Whether to take scroll factors into account when checking for overlap.
*
* @return Whether or not the point overlaps this object.
*/
public boolean overlapsPoint(FlxPoint Point,boolean InScreenSpace)
{
return overlapsPoint(Point,InScreenSpace,null);
}
/**
* Checks to see if a point in 2D world space overlaps this FlxObject object.
*
* @param Point The point in world space you want to check.
*
* @return Whether or not the point overlaps this object.
*/
public boolean overlapsPoint(FlxPoint Point)
{
return overlapsPoint(Point,false,null);
}
/**
* Check and see if this object is currently on screen.
*
* @param Camera Specify which game camera you want. If null getScreenXY() will just grab the first global camera.
*
* @return Whether the object is on screen or not.
*/
public boolean onScreen(FlxCamera Camera)
{
if(Camera == null)
Camera = FlxG.camera;
getScreenXY(_point,Camera);
return (_point.x + width > 0) && (_point.x < Camera.width) && (_point.y + height > 0) && (_point.y < Camera.height);
}
/**
* Check and see if this object is currently on screen.
*/
public boolean onScreen()
{
return onScreen(null);
}
/**
* Call this function to figure out the on-screen position of the object.
*
* @param Point Takes a FlxPoint object and assigns the post-scrolled X and Y values of this object to it.
* @param Camera Specify which game camera you want. If null getScreenXY() will just grab the first global camera.
*
* @return The Point you passed in, or a new Point if you didn't pass one, containing the screen X and Y position of this object.
*/
public FlxPoint getScreenXY(FlxPoint Point,FlxCamera Camera)
{
if(Point == null)
Point = new FlxPoint();
if(Camera == null)
Camera = FlxG.camera;
Point.x = x - (Camera.scroll.x*scrollFactor.x);
Point.y = y - (Camera.scroll.y*scrollFactor.y);
Point.x += (Point.x > 0)?0.0000001f:-0.0000001f;
Point.y += (Point.y > 0)?0.0000001f:-0.0000001f;
return Point;
}
/**
* Call this function to figure out the on-screen position of the object.
*
* @param Point Takes a FlxPoint object and assigns the post-scrolled X and Y values of this object to it.
*
* @return The Point you passed in, or a new Point if you didn't pass one, containing the screen X and Y position of this object.
*/
public FlxPoint getScreenXY(FlxPoint Point)
{
return getScreenXY(Point,null);
}
/**
* Call this function to figure out the on-screen position of the object.
*
* @return The Point you passed in, or a new Point if you didn't pass one, containing the screen X and Y position of this object.
*/
public FlxPoint getScreenXY()
{
return getScreenXY(null,null);
}
/**
* Tells this object to flicker, retro-style.
* Pass a negative value to flicker forever.
*
* @param Duration How many seconds to flicker for.
*/
public void flicker(float Duration)
{
_flickerTimer = Duration;
if(_flickerTimer == 0)
_flicker = false;
}
/**
* Tells this object to flicker, retro-style.
* Pass a negative value to flicker forever.
*/
public void flicker()
{
flicker(1);
}
/**
* Check to see if the object is still flickering.
*
* @return Whether the object is flickering or not.
*/
public boolean getFlickering()
{
return _flickerTimer != 0;
}
/**
* Whether the object collides or not. For more control over what directions
* the object will collide from, use collision constants (like LEFT, FLOOR, etc)
* to set the value of allowCollisions directly.
*/
public boolean getSolid()
{
return (allowCollisions & ANY) > NONE;
}
/**
* Whether the object collides or not. For more control over what directions
* the object will collide from, use collision constants (like LEFT, FLOOR, etc)
* to set the value of allowCollisions directly.
*/
public void setSolid(boolean Solid)
{
if(Solid)
allowCollisions = ANY;
else
allowCollisions = NONE;
}
/**
* Retrieve the midpoint of this object in world coordinates.
*
* @param Point Allows you to pass in an existing FlxPoint object if you're so inclined. Otherwise a new one is created.
*
* @return A FlxPoint object containing the midpoint of this object in world coordinates.
*/
public FlxPoint getMidpoint(FlxPoint Point)
{
if(Point == null)
Point = new FlxPoint();
Point.x = x + width*0.5f;
Point.y = y + height*0.5f;
return Point;
}
/**
* Retrieve the midpoint of this object in world coordinates.
*
* @return A FlxPoint object containing the midpoint of this object in world coordinates.
*/
public FlxPoint getMidpoint()
{
return getMidpoint(null);
}
/**
* Handy function for reviving game objects.
* Resets their existence flags and position.
*
* @param X The new X position of this object.
* @param Y The new Y position of this object.
*/
public void reset(float X, float Y)
{
revive();
touching = NONE;
wasTouching = NONE;
x = X;
y = Y;
last.x = x;
last.y = y;
velocity.x = 0;
velocity.y = 0;
}
/**
* Handy function for checking if this object is touching a particular surface.
* For slightly better performance you can just & the value directly into touching.
* However, this method is good for readability and accessibility.
*
* @param Direction Any of the collision flags (e.g. LEFT, FLOOR, etc).
*
* @return Whether the object is touching an object in (any of) the specified direction(s) this frame.
*/
public boolean isTouching(int Direction)
{
return (touching & Direction) > NONE;
}
/**
* Handy function for checking if this object is just landed on a particular surface.
*
* @param Direction Any of the collision flags (e.g. LEFT, FLOOR, etc).
*
* @return Whether the object just landed on (any of) the specified surface(s) this frame.
*/
public boolean justTouched(int Direction)
{
return ((touching & Direction) > NONE) && ((wasTouching & Direction) <= NONE);
}
/**
* Reduces the "health" variable of this sprite by the amount specified in Damage.
* Calls kill() if health drops to or below zero.
*
* @param Damage How much health to take away (use a negative number to give a health bonus).
*/
public void hurt(float Damage)
{
health = health - Damage;
if(health <= 0)
kill();
}
/**
* The main collision resolution function in flixel.
*
* @param Object1 Any FlxObject.
* @param Object2 Any other FlxObject.
*
* @return Whether the objects in fact touched and were separated.
*/
static public boolean separate(FlxObject Object1, FlxObject Object2)
{
boolean separatedX = separateX(Object1,Object2);
boolean separatedY = separateY(Object1,Object2);
return separatedX || separatedY;
}
/**
* The X-axis component of the object separation process.
*
* @param Object1 Any FlxObject.
* @param Object2 Any other FlxObject.
*
* @return Whether the objects in fact touched and were separated along the X axis.
*/
static public boolean separateX(FlxObject Object1, FlxObject Object2)
{
//can't separate two immovable objects
boolean obj1immovable = Object1.immovable;
boolean obj2immovable = Object2.immovable;
if(obj1immovable && obj2immovable)
return false;
//If one of the objects is a tilemap, just pass it off.
if(Object1 instanceof FlxTilemap)
return ((FlxTilemap) (Object1)).overlapsWithCallback(Object2,separateX);
if(Object2 instanceof FlxTilemap)
return ((FlxTilemap) (Object2)).overlapsWithCallback(Object1,separateX,true);
//First, get the two object deltas
float overlap = 0;
float obj1delta = Object1.x - Object1.last.x;
float obj2delta = Object2.x - Object2.last.x;
if(obj1delta != obj2delta)
{
//Check if the X hulls actually overlap
float obj1deltaAbs = (obj1delta > 0)?obj1delta:-obj1delta;
float obj2deltaAbs = (obj2delta > 0)?obj2delta:-obj2delta;
float obj1x = Object1.x-((obj1delta > 0)?obj1delta:0);
float obj1y = Object1.last.y;
float obj1width = Object1.width+((obj1delta > 0)?obj1delta:-obj1delta);
float obj1height = Object1.height;
float obj2x = Object2.x -((obj2delta > 0)?obj2delta:0);
float obj2y = Object2.last.y;
float obj2width = Object2.width+((obj2delta > 0)?obj2delta:-obj2delta);
float obj2height = Object2.height;
if((obj1x + obj1width > obj2x) && (obj1x < obj2x + obj2width) && (obj1y + obj1height > obj2y) && (obj1y < obj2y + obj2height))
{
float maxOverlap = obj1deltaAbs + obj2deltaAbs + OVERLAP_BIAS;
//If they did overlap (and can), figure out by how much and flip the corresponding flags
if(obj1delta > obj2delta)
{
overlap = Object1.x + Object1.width - Object2.x;
if((overlap > maxOverlap) || (Object1.allowCollisions & RIGHT) == 0 || (Object2.allowCollisions & LEFT) == 0)
overlap = 0;
else
{
Object1.touching |= RIGHT;
Object2.touching |= LEFT;
}
}
else if(obj1delta < obj2delta)
{
overlap = Object1.x - Object2.width - Object2.x;
if((-overlap > maxOverlap) || (Object1.allowCollisions & LEFT) == 0 || (Object2.allowCollisions & RIGHT) == 0)
overlap = 0;
else
{
Object1.touching |= LEFT;
Object2.touching |= RIGHT;
}
}
}
}
//Then adjust their positions and velocities accordingly (if there was any overlap)
if(overlap != 0)
{
float obj1v = Object1.velocity.x;
float obj2v = Object2.velocity.x;
if(!obj1immovable && !obj2immovable)
{
overlap *= 0.5f;
Object1.x = Object1.x - overlap;
Object2.x += overlap;
float obj1velocity = (float) (Math.sqrt((obj2v * obj2v * Object2.mass)/Object1.mass) * ((obj2v > 0)?1:-1));
float obj2velocity = (float) (Math.sqrt((obj1v * obj1v * Object1.mass)/Object2.mass) * ((obj1v > 0)?1:-1));
float average = (obj1velocity + obj2velocity)*0.5f;
obj1velocity -= average;
obj2velocity -= average;
Object1.velocity.x = average + obj1velocity * Object1.elasticity;
Object2.velocity.x = average + obj2velocity * Object2.elasticity;
}
else if(!obj1immovable)
{
Object1.x = Object1.x - overlap;
Object1.velocity.x = obj2v - obj1v*Object1.elasticity;
}
else if(!obj2immovable)
{
Object2.x += overlap;
Object2.velocity.x = obj1v - obj2v*Object2.elasticity;
}
return true;
}
else
return false;
}
/**
* The Y-axis component of the object separation process.
*
* @param Object1 Any FlxObject.
* @param Object2 Any other FlxObject.
*
* @return Whether the objects in fact touched and were separated along the Y axis.
*/
static public boolean separateY(FlxObject Object1, FlxObject Object2)
{
//can't separate two immovable objects
boolean obj1immovable = Object1.immovable;
boolean obj2immovable = Object2.immovable;
if(obj1immovable && obj2immovable)
return false;
//If one of the objects is a tilemap, just pass it off.
if(Object1 instanceof FlxTilemap)
return ((FlxTilemap) (Object1)).overlapsWithCallback(Object2,separateY);
if(Object2 instanceof FlxTilemap)
return ((FlxTilemap) (Object2)).overlapsWithCallback(Object1,separateY,true);
//First, get the two object deltas
float overlap = 0;
float obj1delta = Object1.y - Object1.last.y;
float obj2delta = Object2.y - Object2.last.y;
if(obj1delta != obj2delta)
{
//Check if the Y hulls actually overlap
float obj1deltaAbs = (obj1delta > 0)?obj1delta:-obj1delta;
float obj2deltaAbs = (obj2delta > 0)?obj2delta:-obj2delta;
float obj1x = Object1.x;
float obj1y = Object1.y - ((obj1delta > 0)?obj1delta:0);
float obj1width = Object1.width;
float obj1height = Object1.height + obj1deltaAbs;
float obj2x = Object2.x;
float obj2y = Object2.y - ((obj2delta > 0)?obj2delta:0);
float obj2width = Object2.width;
float obj2height = Object2.height + obj2deltaAbs;
if((obj1x + obj1width > obj2x) && (obj1x < obj2x + obj2width) && (obj1y + obj1height > obj2y) && (obj1y < obj2y + obj2height))
{
float maxOverlap = obj1deltaAbs + obj2deltaAbs + OVERLAP_BIAS;
//If they did overlap (and can), figure out by how much and flip the corresponding flags
if(obj1delta > obj2delta)
{
overlap = Object1.y + Object1.height - Object2.y;
if((overlap > maxOverlap) || (Object1.allowCollisions & DOWN) == 0 || (Object2.allowCollisions & UP) == 0)
overlap = 0;
else
{
Object1.touching |= DOWN;
Object2.touching |= UP;
}
}
else if(obj1delta < obj2delta)
{
overlap = Object1.y - Object2.height - Object2.y;
if((-overlap > maxOverlap) || (Object1.allowCollisions & UP) == 0 || (Object2.allowCollisions & DOWN) == 0)
overlap = 0;
else
{
Object1.touching |= UP;
Object2.touching |= DOWN;
}
}
}
}
//Then adjust their positions and velocities accordingly (if there was any overlap)
if(overlap != 0)
{
float obj1v = Object1.velocity.y;
float obj2v = Object2.velocity.y;
if(!obj1immovable && !obj2immovable)
{
overlap *= 0.5f;
Object1.y = Object1.y - overlap;
Object2.y += overlap;
float obj1velocity = (float) (Math.sqrt((obj2v * obj2v * Object2.mass)/Object1.mass) * ((obj2v > 0)?1:-1));
float obj2velocity = (float) (Math.sqrt((obj1v * obj1v * Object1.mass)/Object2.mass) * ((obj1v > 0)?1:-1));
float average = (obj1velocity + obj2velocity)*0.5f;
obj1velocity -= average;
obj2velocity -= average;
Object1.velocity.y = average + obj1velocity * Object1.elasticity;
Object2.velocity.y = average + obj2velocity * Object2.elasticity;
}
else if(!obj1immovable)
{
Object1.y = Object1.y - overlap;
Object1.velocity.y = obj2v - obj1v*Object1.elasticity;
//This is special case code that handles cases like horizontal moving platforms you can ride
if(Object2.active && Object2.moves && (obj1delta > obj2delta))
Object1.x += Object2.x - Object2.last.x;
}
else if(!obj2immovable)
{
Object2.y += overlap;
Object2.velocity.y = obj1v - obj2v*Object2.elasticity;
//This is special case code that handles cases like horizontal moving platforms you can ride
if(Object1.active && Object1.moves && (obj1delta < obj2delta))
Object2.x += Object1.x - Object1.last.x;
}
return true;
}
else
return false;
}
/**
* Internal callback function for collision.
*/
protected static IFlxObject separateX = new IFlxObject()
{
@Override
public boolean callback(FlxObject Object1, FlxObject Object2)
{
return separateX(Object1, Object2);
}
};
/**
* Internal callback function for collision.
*/
protected static IFlxObject separateY = new IFlxObject()
{
@Override
public boolean callback(FlxObject Object1, FlxObject Object2)
{
return separateY(Object1, Object2);
}
};
}
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