问题是我的射弹的开始和结束位置都偏离了。我已经知道了NSLog所有的内容，CGPoints并且从我可以看到输入的点CCSequence是正确的。但从我在屏幕上看到的情况来看，情况有所不同。
我认为错误的一个重要线索是，如果创建一个新的 CCSprite 并像我使用射弹一样使用它，那么路径就会起作用。
这里是游戏关卡层的addProjectile方法（GameLevels:Level1Layer）
-(void)addProjectile:(Projectiles*)projectile
{
NSLog(@"projectile position %@",NSStringFromCGPoint(projectile.position));
NSLog(@"wizard position %@",NSStringFromCGPoint(self.wizardHero.position));
NSLog(@"wizard position worldspace %@",NSStringFromCGPoint([self convertToWorldSpace:self.wizardHero.position]));
NSLog(@"destination position %@",NSStringFromCGPoint(projectile.destination.position));
[self addChild:projectile];
// Determine where we wish to shoot the projectile to
int realX;
CGPoint diff = ccpSub(projectile.destination.position,projectile.position);
if (diff.x > 0)
{
realX = (self.tileMap.mapSize.width * self.tileMap.tileSize.width) +
(projectile.contentSize.width/2);
} else {
realX = -(self.tileMap.mapSize.width * self.tileMap.tileSize.width) -
(projectile.contentSize.width/2);
}
float ratio = (float) diff.y / (float) diff.x;
int realY = ((realX - projectile.position.x) * ratio) + projectile.position.y;
CGPoint realDest = ccp(realX, realY);
// Determine the length of how far we're shooting
int offRealX = realX - projectile.position.x;
int offRealY = realY - projectile.position.y;
float length = sqrtf((offRealX*offRealX) + (offRealY*offRealY));
float velocity = 280/1; // 280pixels/1sec
float realMoveDuration = length/velocity;
// Move projectile to actual endpoint
id actionMoveDone = [CCCallFuncN actionWithTarget:self
selector:@selector(projectileMoveFinished:)];
[projectile runAction:
[CCSequence actionOne:
[CCMoveTo actionWithDuration: realMoveDuration
position: realDest]
two: actionMoveDone]];
[self.projectiles addObject:projectile];
}
这些NSLog语句的输出将是（仅供参考：射弹是从添加的self.wizardHero，因此这是它的起始位置；目的地是self.redEnemy）：
2013-03-27 10:41:57.295 GridWars[13025:c07] 弹丸位置 {105, 178}
2013-03-27 10:41:57.296 GridWars[13025:c07] 向导位置 {105, 178}
2013-03-27 10:41:57.297 GridWars[13025:c07] 向导位置世界空间 {105, 178}
2013-03-27 10:41:57.298 GridWars[13025:c07] 目标位置 {299, 174}
2013-03-27 11:34:46.608 GridWars[13344:c07] realDest {650, 166}
2013-03-27 11:34:46.608 GridWars[13344:c07] 长度 545.132080
2013-03-27 11:34:46.610 GridWars[13344:c07] realMoveDuration 1.946900
我意识到，对于超级类，我很难说出发生了什么（有点为什么我包含了源代码）。基本上虽然我有三个主要的超类，它们是从CCNode
Projectiles : CCNode
sprite : CCSprite
destination : GameCharacters
damage : int
GameLevels : CCNode
hud : HudLayer
tileMap : CCTMXTiledMap
enemies : NSMutablArray
projectiles : NSMutablArray
GameCharacters : CCNode
hp : int
juice : int
sprite : CCSprite
selectedTargets : NSMutablArray
hostLayer : GameLevels
那么实际实现这些的三个类
BasicProjectile : Projectiles
Level1Layer : GameLevels
WizardHero : GameCharacter
RedEnemy : GameCharacter
尽管问题略有发展，但我已将其发布在cocos2d 论坛上并获得了一些帮助，这使我达到了这一点（看到弹丸，但路径错误而不是根本看不到它们）。但是已经有几天了，所以希望得到更多帮助。
GameProjectiles:CCNode
#import "CCNode.h"
//forward declaration because we just need to hold a reference
@class GameCharacters;
@interface GameProjectiles : CCNode
@property(nonatomic, strong) CCSprite * sprite;
@property(nonatomic,strong) GameCharacters * destination;
@property(nonatomic) int damage;
-(id)initWithDestination:(GameCharacters*)Destination;
-(CGSize)contentSize;
@end
#import "GameProjectiles.h"
@implementation GameProjectiles
-(id)initWithDestination:(GameCharacters*)Destination
{
if (self = [super init]) {
_damage = 0;
_destination = Destination;
}
return self;
}
-(CGSize)contentSize{
return self.sprite.contentSize;
}
-(void)setPosition:(CGPoint)position
{
[super setPosition:position];
self.sprite.position = position;
}
@end
基本弹丸
#import "GameProjectiles.h"
@interface BasicProjectile : GameProjectiles
@end
#import "BasicProjectile.h"
@implementation BasicProjectile
-(id)initWithDestination:(GameCharacters*)Destination
{
if (self = [super init]) {
self.damage = 25;
self.sprite = [CCSprite spriteWithFile:@"Projectile.png"];
[self addChild:self.sprite z:1000 ];
self.destination = Destination;
}
return self;
}
@end