Chipmunk the emergence and resolution of zombie physical objects (v)

, because the code to get the bounce rods to grow and shorten is similar, so we'll just look at one, so let's take a closer look at the shortened method.

+ (void) Dostickshorterwork: (Stick *) stick{gamescene *gamescene = [Gamescene Sharedgamescene];Ccphysicsnode *physicsworld = (ccphysicsnode*) stick. Parent;@synchronized (Gamescene) {if ([stick. Nameisequaltostring:@"Stickshorter"]) {return;} if ([Stick. Nameisequaltostring:@"Sticklonger"]) {Stick *sticknormal = [Stick sticknormal];Sticknormal. Position= Stick. Position;[Physicsworld Removechild:stick Cleanup:yes];[Physicsworld Addchild:sticknormal];Gamescene. Stickingamescene= Sticknormal;Return;}} cgpoint Position = Stick. Position;__block Stick *stickshorter;@synchronized (gamescene) {stickshorter = [Stick Stickshorter];[Physicsworld Removechild:stick Cleanup:yes];Stickshorter. Position= Position;[Physicsworld Addchild:stickshorter];Stickshorter. Visible= NO;Gamescene. Stickingamescene= Stickshorter;Ccsprite *sticknode = (ccsprite*) [Ccbreader load:@"Elements/sticknode"];Sticknode. Position= Stickshorter. Position;[Gamescene Addchild:sticknodeZ: -];Ccactionscaleto *shorteraction = [Ccactionscaleto actionwithduration:0.4F ScaleX:0.5F ScaleY:1.0F;Ccactioncallblock *blk = [Ccactioncallblock actionwithblock:^{[Sticknode removefromparent];Stickshorter. Visible= YES;}];Ccactionsequence *seq = [Ccactionsequence Actions:shorteraction,blk,nil];[Sticknode Runaction:seq];} [Stickshorter scheduleblock:^ (Cctimer *timer) {@synchronized (gamescene) {Stick *sticknormal = [Stic K Sticknormal];Sticknormal. Position= Stickshorter. Position;[Stickshorter Removefromparent];Stickshorter = Nil;[Physicsworld Addchild:sticknormal];Gamescene. Stickingamescene= Sticknormal;}} Delay:Ten];}

The code is long, so let's look at it in turn.

First, an instance of Gamescene and the physical world object is obtained.

If the current stick is already short, it can no longer be shortened, so the direct exit method
If the current stick is a long stick, delete the stick and create a new normal-length stick. Equivalent to a long stick hit the shorter pentagram to return to normal size, and then exit the method.

Otherwise, the current should be the normal size of the stick need to shorten it, the practice is:

1. First create a short stick in the original stick position, but set it to be invisible, because there is also a shorter animation effect;
2. Create a stick node without a physical object and perform a shorter animation;
3. Delete itself at the end of the animation and make the short stick visible. Note that animation time needs to be moderate, neither too long nor too short. This will be detailed in the iOS Game Development Series blog post.
4. Add a block with a delay of 10 seconds to the short stick, delete it after 10 seconds, and create a new normal size stick in the original location. Equivalent to restoring the normal size of the stick after 10 seconds.

The above is the relevant function code.

Compile and run the app. Occasionally a "zombie stick" is generated on the screen while the game is running, which says that the object cannot be found in the physical world and is not deleted.

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Chipmunk the emergence and resolution of zombie physical objects (v)