IOS--Skphysicsworld class

Skphysicsworld class

Inherit from	NSObject
Meet	Nscoding NSObject (NSObject)
Framework	/system/library/frameworks/spritekit.framework
Availability of	Available for iOS 7.0 or later
Declared on	SKPhysicsWorld.h
Reference Guide	Sprite Kit progamming Guide

Overview

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Skphysicsworld instances simulate collisions and other physical properties. You do not need to create the Skphysicsworld property directly, you can view the Physicsworld property of Skscene.

Skphysicsworld instances allow you to do the following:

Simulates a global property, such as Gravity

Create a union between two physical bodies

Set up a proxy that receives messages between two connected physical bodies

Determine the intersection of points, rectangles, and rays between physical bodies

Method

Unite the physical body together.

-Addjoint:

Add a union to the physical world.

-(void) Addjoint: (Skphysicsjoint *) joint

Parameters	Joint: The Union to be added
return value

Discussed

A union has to work, and it has to be added to the physical world.

-Removealljonits

Removes all unions in the physical world.

-(void) removealljoints

-Removejonit:

Removes the specified union from the physical world.

-(void) Removejoint: (Skphysicsjoint *) joint

Parameters	Joint: the Union to be removed
return value

Find physical bodies in the physical world

-Bodyalongraystart:end:

Finds the first physical body that intersects the ray.

-(Skphysicsbody *) Bodyalongraystart: (cgpoint) Start end: (cgpoint) End

Parameters	Start: The starting point of the Ray End: The ending point of the Ray
return value	The first physical body that intersects the ray, if not, returns nil

-Bodyatpoint:

Finds the first physical body that contains a point.

-(Skphysicsbody *) Bodyatpoint: (cgpoint) point

Parameters	Point: A dot in the scene coordinate system
return value	The first physical body containing this point, if not, returns nil

-Bodyinrect

Finds the first physical body that intersects the specified rectangle.

-(Skphysicsbody *) Bodyinrect: (cgrect) rect

Parameters	Rect: A rectangle in the scene coordinate system
return value	The first physical body that intersects with this rectangle, if not, returns nil

-EnumerateBodiesAlongRayStart:end:usingBlock:

Enumerates all the physical bodies that intersect the ray.

-(void) Enumeratebodiesalongraystart: (cgpoint) Start end: (cgpoint) End Usingblock: (void (^) (Skphysicsbody *body, Cgpoint poing, Cgpint Normal, BOOL *stop) block

Parameters	Start: The starting point of the Ray End: The ending point of the Ray Block: A block of syntax, each of the physical bodies that intersect the ray will trigger Body: The physical body that intersects the Ray Point: The intersection of a ray and a physical body Normal: normal vector at intersection Stop: A Boolean value that terminates the enumeration
return value

-Enumeratebodiesatpoint:usingblock:

Enumerates all the physical bodies that contain a point.

-(void) Enumeratebodiesatpoint: (cgpoint) point usingblock: (void (^) (skphysicsbody *body, BOOL *stop)) block

Parameters	Point: Points in the scene coordinate system Block: A block of syntax that triggers every physical body that contains that point Body: The physical body where the rays intersect Stop: A Boolean value that terminates the enumeration
return value

-Enumeratebodiesinrect:usingblock:

Enumerates all the physical bodies that intersect the specified rectangle.

-(void) Enumeratebodiesinrect: (cgrect) rect usingblock: (void (^) (skphysicsbody *body, BOOL *stop)) block

Parameters	Rect: A rectangle in the scene coordinate system Block: A syntax block that fires every physical body that intersects with the rectangle. Body: The physical body that intersects with the rectangle Stop: A Boolean value that terminates the enumeration
return value

Property

Simulating the physical world

Gravity

A vector that specifies the gravitational acceleration of the physical world.

@property (atomic) Cgpoint Gravity

Discussed

The unit of this property is meters per second, and the default value is (0.0,-9.8), which represents the Earth's gravitational acceleration.

Speed

The execution rate of the simulation.

@property (atomic) CGFloat speed

Discussed

The default value is 1.0, which indicates that impersonation is performed at a normal rate. A value different from the default value will change the execution rate of the simulation. For example, a value of 2.0 indicates that the simulation will be performed at twice times the rate. If only 0.0, the tentative simulation is indicated.

Detects collisions in the physical world.

Contactdelegate

An agent that will be called when two connected bodies come in.

@property (Atomic, assign) id<skphysicscontactdelegate> contactdelegate

Discussed

When two physical bodies overlap, the connection is created. A physical body that owns the Contacttestbitmask attribute overlaps with the categorybitmask attribute of another physical body.

IOS--Skphysicsworld class