Cocos2D Sprite 动画 - 仅在屏幕上滑动的 Sprite
Posted
技术标签:
【中文标题】Cocos2D Sprite 动画 - 仅在屏幕上滑动的 Sprite【英文标题】：Cocos2D Sprite Animation - Sprite Only Sliding Across Screen 【发布时间】：2013-11-18 11:14:14 【问题描述】：我在让精灵做行走动画时遇到了一些麻烦。目前，它只显示动画的第一帧并且在屏幕上“滑动”。我尝试了一些不同的方法，但都没有成功，我需要一些帮助来找出问题所在。
下面是精灵类的头文件：
#import <Foundation/Foundation.h>
#import "cocos2d.h"
#import "mainGameLayer.h"
@class MainGameLayer, Waypoint, Tower;
@interface Unit : CCSprite
CGPoint myPosition;
int maxHP;
int currentHP;
float walkingSpeed;
Waypoint *destinationWaypoint;
BOOL active;
@property (nonatomic, assign) MainGameLayer *theGame;
@property (nonatomic, strong) CCSprite *mySprite;
@property (nonatomic, strong) CCAction *walkAction;
@property (nonatomic, assign) float centerToSides;
@property (nonatomic, assign) float centerToBottom;
+(id) nodeWithTheGame: (MainGameLayer *)_game;
-(id) initWithTheGame: (MainGameLayer *)_game;
-(void) doActivate;
-(void) getRemoved;
@end
Sprite类实现文件：
#import "Unit.h"
#import "Tower.h"
#import "Waypoint.h"
#define HEALTH_BAR_WIDTH 20
#define HEALTH_BAR_ORIGIN -10
@implementation Unit
@synthesize theGame;
@synthesize mySprite;
+(id) nodeWithTheGame:(MainGameLayer *)_game
return [[self alloc] initWithTheGame:_game];
// BELOW IS THE ORIGINAL INIT FUNCTION, UNMODIFIED, AND IN WORKING CONDITION
-(id) initWithTheGame:(MainGameLayer *)_game
if ((self=[super init]))
CCArray *walkFrames = [CCArray arrayWithCapacity:6];
for (int i = 0; i < 6; i++)
CCSpriteFrame *frame = [[CCSpriteFrameCache sharedSpriteFrameCache] spriteFrameByName:[NSString stringWithFormat:@"hero_walk_%02d.png", i]];
[walkFrames addObject:frame];
CCAnimation *walkAnimation = [CCAnimation animationWithSpriteFrames:[walkFrames getNSArray] delay:1.0/12.0];
theGame = _game;
maxHP = 40;
currentHP = maxHP;
active = FALSE;
walkingSpeed = 0.5;
Waypoint * waypoint = (Waypoint *)[theGame.waypoints objectAtIndex:([theGame.waypoints count]-1)];
destinationWaypoint = waypoint.nextWaypoint;
CGPoint pos = waypoint.myPosition;
myPosition = pos;
self.mySprite = [CCSprite spriteWithSpriteFrameName:@"hero_walk_00.png"];
self.mySprite.position = pos;
[self addChild:mySprite];
mySprite.flipX = 180;
self.walkAction = [CCRepeatForever actionWithAction: [CCAnimate actionWithAnimation:walkAnimation]];
[theGame addChild:self];
[self scheduleUpdate];
return self;
-(void) doActivate
active = TRUE;
[self stopAllActions];
[self runAction: self.walkAction];
-(void) update:(ccTime)dt
if(!active)return;
if([theGame circle:myPosition withRadius:1 collisionWithCircle:destinationWaypoint.myPosition
collisionCircleRadius:1])
if(destinationWaypoint.nextWaypoint)
destinationWaypoint = destinationWaypoint.nextWaypoint;
else
//Reached the end of the road. Damage the player
[theGame getHpDamage];
[self getRemoved];
CGPoint targetPoint = destinationWaypoint.myPosition;
float movementSpeed = walkingSpeed;
CGPoint normalized = 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.parent removeChild:self cleanup:YES];
[theGame.units removeObject: self];
// Notify the game that we killed an enemy so we can check if we can send another wave
[theGame enemyGotKilled];
-(void) draw
ccDrawSolidRect(ccp(myPosition.x + HEALTH_BAR_ORIGIN, myPosition.y + 16), ccp(myPosition.x + HEALTH_BAR_ORIGIN + HEALTH_BAR_WIDTH, myPosition.y + 14), ccc4f(1.0, 0, 0, 1.0));
ccDrawSolidRect(ccp(myPosition.x + HEALTH_BAR_ORIGIN, myPosition.y + 16), ccp(myPosition.x + HEALTH_BAR_ORIGIN + (float)(currentHP * HEALTH_BAR_WIDTH)/maxHP, myPosition.y + 14), ccc4f(0, 1.0, 0, 1.0));
@end
这里是主要的游戏头文件：
#import <Foundation/Foundation.h>
#import "cocos2d.h"
@interface MainGameLayer : CCLayer
+ (CCScene *) scene;
- (BOOL) circle:(CGPoint)circlePoint withRadius:(float)radius collisionWithCircle:(CGPoint)circlePointTwo collisionCircleRadius:(float)radiusTwo;
void ccFillPoly (CGPoint *poli, int points, BOOL closePolygon);
- (void) enemyGotKilled;
- (void) getHpDamage;
@property (nonatomic, strong) NSMutableArray *towers;
@property (nonatomic, strong) NSMutableArray *waypoints;
@property (nonatomic, strong) NSMutableArray *units;
@end
最后是主游戏实现文件：
#import "MainGameLayer.h"
#import "Tower.h"
#import "Waypoint.h"
#import "Unit.h"
@implementation MainGameLayer
@synthesize towers;
@synthesize waypoints;
@synthesize units;
+ (CCScene *) scene
CCScene *scene = [CCScene node];
MainGameLayer *layer = [MainGameLayer node];
[scene addChild: layer];
return scene;
- (id) init
if ((self = [super init]))
// Initialize
self.isTouchEnabled = TRUE;
CGSize winSize = [CCDirector sharedDirector].winSize;
// Setting the background (Map)
CCSprite *background = [CCSprite spriteWithFile:@"layout.png"];
[self addChild: background];
[background setPosition: ccp(winSize.width/2, winSize.height/2)];
[self addWaypoints];
// In Game Buttons / Menu
CCMenuItem *sampleButton = [CCMenuItemImage itemWithNormalImage:@"sample.jpg" selectedImage:@"sample.jpg" target:self selector:@selector(samplePurchased:)];
CCMenu *PurchaseUI = [CCMenu menuWithItems:sampleButton, nil];
[PurchaseUI setScale:0.5];
[PurchaseUI setPosition:ccp(63, 51)];
[PurchaseUI alignItemsHorizontally];
PurchaseUI.isTouchEnabled = TRUE;
[self addChild: PurchaseUI];
// Set up the sprite sheets (Currently in testing)
[[CCSpriteFrameCache sharedSpriteFrameCache] addSpriteFramesWithFile:@"pd_sprites.plist"];
CCSpriteBatchNode *spriteSheet = [CCSpriteBatchNode batchNodeWithFile:@"pd_sprites.pvr.ccz"];
[self addChild: spriteSheet];
return self;
-(BOOL) canBuyTower
return YES;
-(void) ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
for (UITouch *touch in touches)
CGPoint location = [touch locationInView: [touch view]];
location = [[CCDirector sharedDirector] convertToGL: location];
CCLOG(@"X: %f Y: %f", location.x, location.y);
if ([self canBuyTower])
// Spend the gold later
Tower *tower = [Tower nodeWithTheGame:self location: location];
[towers addObject: tower];
-(void) addWaypoints
waypoints = [[NSMutableArray alloc] init];
Waypoint * waypoint1 = [Waypoint nodeWithTheGame:self location:ccp(-25,360)];
[waypoints addObject:waypoint1];
Waypoint * waypoint2 = [Waypoint nodeWithTheGame:self location:ccp(73,360)];
[waypoints addObject:waypoint2];
waypoint2.nextWaypoint =waypoint1;
Waypoint * waypoint3 = [Waypoint nodeWithTheGame:self location:ccp(467,360)];
[waypoints addObject:waypoint3];
waypoint3.nextWaypoint =waypoint2;
Waypoint * waypoint4 = [Waypoint nodeWithTheGame:self location:ccp(905,360)];
[waypoints addObject:waypoint4];
waypoint4.nextWaypoint =waypoint3;
Waypoint * waypoint5 = [Waypoint nodeWithTheGame:self location:ccp(1050,360)];
[waypoints addObject:waypoint5];
waypoint5.nextWaypoint =waypoint4;
-(BOOL) circle:(CGPoint)circlePoint withRadius:(float)radius collisionWithCircle:(CGPoint)circlePointTwo collisionCircleRadius:(float)radiusTwo
float xdif = circlePoint.x - circlePointTwo.x;
float ydif = circlePoint.y - circlePointTwo.y;
float distance = sqrt(xdif*xdif + ydif*ydif);
if (distance <= radius + radiusTwo)
return TRUE;
return FALSE;
-(void) samplePurchased: (id)sender
Unit *unit = [Unit nodeWithTheGame: self];
[units addObject: unit];
[unit schedule:@selector(doActivate)];
@end
【问题讨论】：
[mySprite runAction:walkAction] ? 【参考方案1】：最终这个选择器运行每一帧：
-(void) doActivate
active = TRUE;
[self stopAllActions];
[self runAction: self.walkAction];
所以每一帧它都会停止所有动作，并运行一个新的步行动作。下一帧行走动作停止，然后重新开始。冲洗并重复。
由于步行动画从每一帧开始，它永远没有机会前进到下一帧。
【讨论】：
很抱歉，这听起来像是一个初学者的问题，但为什么“doActivate”每帧都运行？我可能是错的，但我相信一旦玩家按下按钮购买单位，我将其编码为每个单位调用一次“doActivate”。我对其进行了更改，以便删除“stopallactions”行，而是放入一个标志，说明它是否尚未执行运行操作，然后运行它；这在我的精灵滑动时产生了相同的结果。 [单位时间表：@selector(doActivate)]; 嗯，好的。谢谢你澄清这一点。我没有意识到它正在安排它调用每一帧。我一直认为只是调用该特定函数一次。我已经更换了它，所以我现在只调用一次该函数，但似乎我仍然有同样的问题。关于还有什么可能导致这种情况发生的任何想法？再次感谢您迄今为止的帮助！以上是关于Cocos2D Sprite 动画 - 仅在屏幕上滑动的 Sprite的主要内容，如果未能解决你的问题，请参考以下文章
在 Cocos2D 和 Spritebuilder 中为 Sprite 设置动画
iPhone 上的 Cocos2d：使用在单独的类文件中定义的 Sprite