COCOS2D: Tower Defense Game Making Tour (11)

It's time to put some bad guys in the mix!

Open HelloWorldLayer.h and add the following code:

// Add these instance variablesint wave;CCLabelBMFont *ui_wave_lbl;// Add the following property to the properties section@property (nonatomic,strongNSMutableArray *enemies;

Modify the Helloworldlayer.m file as follows:

// Synthesize enemies@synthesize enemies;

Now it's time to create classes that hold enemy information and manage how they move on the screen. Create a new class with the name enemy and inherit from Ccnode.

Replace the Enemy.h with the following:

#import "Cocos2d.h" #import "HelloWorldLayer.h"  @class helloworldlayer, waypoint, Tower; @interface Enemy: ccnode {    CgpointMyposition;intMAXHP;intCURRENTHP;floatWalkingspeed; Waypoint *destinationwaypoint;BOOLActive;}@property(nonatomic,Assign) Helloworldlayer *thegame;@property(nonatomic,Assign) Ccsprite *mysprite;+ (ID) Nodewiththegame: (helloworldlayer*) _game;-(ID) Initwiththegame: (Helloworldlayer *) _game;-(void) doactivate;-(void) getremoved;@end

Now replace the ENEMY.M file with the following:

#import "Enemy.h" #import "Tower.h" #import "Waypoint.h" #define Health_bar_width#define HEALTH_BAR_ORIGIN-10 @implementation Enemy @synthesizeMySprite, thegame;+ (ID) Nodewiththegame: (helloworldlayer*) _game {return[[ SelfAlloc] initwiththegame:_game];} -(ID) Initwiththegame: (Helloworldlayer *) _game {if(( Self=[SuperInit]) {thegame = _game; MAXHP = +;        CURRENTHP = MAXHP; Active =NO; Walkingspeed =0.5; MySprite = [Ccsprite spritewithfile:@"Enemy.png"]; [ SelfAddchild:mysprite]; Waypoint * Waypoint = (waypoint *) [TheGame. waypointsObjectatindex: ([thegame. waypointscount]-1)]; Destinationwaypoint = Waypoint. Nextwaypoint;Cgpointpos = Waypoint. Myposition;        Myposition = pos;        [MySprite Setposition:pos]; [TheGame AddChild: Self]; [ SelfScheduleupdate]; }return  Self;} -(void) doactivate{active =YES;} -(void) Update: (cctime) dt{if(!active)return;if([TheGame circle:myposition Withradius:1Collisionwithcircle:destinationwaypoint. MypositionCollisioncircleradius:1])    {if(Destinationwaypoint. Nextwaypoint) {Destinationwaypoint = Destinationwaypoint. Nextwaypoint; }Else{//reached the end of the road. Damage the player[TheGame Gethpdamage]; [ SelfGetremoved]; }    }CgpointTargetPoint = Destinationwaypoint. Myposition;floatMovementspeed = Walkingspeed;Cgpointnormalized = Ccpnormalize (CCP (targetpoint. x-myposition. x, TargetPoint. Y-myposition. Y)); MySprite. Rotation= Cc_radians_to_degrees (atan2 (normalized. Y,-normalized. x)); Myposition = CCP (myposition. x+normalized. x* Movementspeed, Myposition. Y+normalized. Y* movementspeed); [MySprite setposition:myposition];} -(void) getremoved{[ Self. ParentRemoveChild: SelfCleanupYES]; [TheGame. EnemiesRemoveobject: Self];//notify The game that we killed a enemy so we can check if we can send another wave[TheGame enemygotkilled];} -(void) draw{Ccdrawsolidrect (CCP (myposition. x+health_bar_origin, Myposition. Y+ -), CCP (myposition. x+health_bar_origin+health_bar_width, Myposition. Y+ -), ccc4f (1.0,0,0,1.0)); Ccdrawsolidrect (CCP (myposition. x+health_bar_origin, Myposition. Y+ -), CCP (myposition. x+health_bar_origin + (float) (CURRENTHP * health_bar_width)/maxhp, myposition. Y+ -), ccc4f (0,1.0,0,1.0));}@end

COCOS2D: Tower Defense Game Making Tour (11)