Graphics Reference
In-Depth Information
Listing 11.4
Updated Physics Example with Walls and Multiple Crates
- (
void
)addCrateWithFrame:(
CGRect
)frame
{
Crate
*crate = [[
Crate
alloc
]
initWithFrame
:frame];
[
self
.
containerView
addSubview
:crate];
cpSpaceAddBody
(
self
.
space
, crate.
body
);
cpSpaceAddShape
(
self
.
space
, crate.
shape
);
}
- (
void
)addWallShapeWithStart:(
cpVect
)start end:(
cpVect
)end
{
cpShape
*wall =
cpSegmentShapeNew
(
self
.
space
->
staticBody
, start, end,
1
);
cpShapeSetCollisionType
(wall,
2
);
cpShapeSetFriction
(wall,
0.5
);
cpShapeSetElasticity
(wall,
0.8
);
cpSpaceAddStaticShape
(
self
.
space
, wall);
}
- (
void
)viewDidLoad
{
//invert view coordinate system to match physics
self
.
containerView
.
layer
.
geometryFlipped
=
YES
;
//set up physics space
self
.
space
=
cpSpaceNew
();
cpSpaceSetGravity
(
self
.
space
,
cpv
(
0
, -
GRAVITY
));
//add wall around edge of view
[
self
addWallShapeWithStart
:
cpv
(
0
,
0
)
end
:
cpv
(
300
,
0
)];
[
self
addWallShapeWithStart
:
cpv
(
300
,
0
)
end
:
cpv
(
300
,
300
)];
[
self
addWallShapeWithStart
:
cpv
(
300
,
300
)
end
:
cpv
(
0
,
300
)];
[
self
addWallShapeWithStart
:
cpv
(
0
,
300
)
end
:
cpv
(
0
,
0
)];
//add a crates
[
self
addCrateWithFrame
:
CGRectMake
(
0
,
0
,
32
,
32
)];
[
self
addCrateWithFrame
:
CGRectMake
(
32
,
0
,
32
,
32
)];
[
self
addCrateWithFrame
:
CGRectMake
(
64
,
0
,
64
,
64
)];
[
self
addCrateWithFrame
:
CGRectMake
(
128
,
0
,
32
,
32
)];
[
self
addCrateWithFrame
:
CGRectMake
(
0
,
32
,
64
,
64
)];
//start the timer
self
.
lastStep
=
CACurrentMediaTime
();
self
.
timer
= [
CADisplayLink
displayLinkWithTarget
:
self
selector
:
@selector
(step:)];
[
self
.
timer
addToRunLoop
:[
NSRunLoop
mainRunLoop
]
