(NO.00004)iOS实现打砖块游戏(十三):伸缩自如,我是如意金箍棒(下)!

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准备缩短反弹棒素材

和上一篇类似,我们如法炮制一张缩短后反弹棒的素材.

打开SpriteBuilder,新建StickShorter.ccb文件,按下图绘制其sprite帧和物理对象:

这里写图片描述

注意,在Ai中缩小和放大原来反弹棒的图片时,只要沿X轴一个方向放大即可,否则在Y轴方向也会变大,这就不是我们想要的了.

创建缩短道具星

我们用红色的星星表示缩短道具,所以spawStar中是这样写的:

case brkColorRed:            star = [Star starWithType:starTypeStickShorter];            break;

在GameScene.m中,在星星与反弹棒碰撞的代码中,加入如下代码:

case starTypeStickShorter:            @synchronized(self){                [self scheduleBlock:^(CCTimer *timer){                    [Star doStickShorterWork:self.stickInGameScene];                } delay:0];            }            break;

好了,最后我们回到Star.m中添加doStickShorterWork方法:

+(void)doStickShorterWork:(Stick *)stick{    GameScene *gameScene = [GameScene sharedGameScene];    CCPhysicsNode *physicsWorld = (CCPhysicsNode*)stick.parent;    @synchronized(gameScene){        if ([stick.name isEqualToString:@"stickShorter"]) {            return;        }        if ([stick.name isEqualToString:@"stickLonger"]) {            Stick *stickNormal = [Stick stickNormal];            stickNormal.position = stick.position;            [stick removeFromParent];            //[physicsWorld removeChild:stick cleanup:YES];            [physicsWorld addChild:stickNormal];            gameScene.stickInGameScene = stickNormal;            return;        }    }    CGPoint position = stick.position;    __block Stick *stickShorter;    @synchronized(gameScene){        stickShorter = [Stick stickShorter];        [stick removeFromParent];        //[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:stickNode z:50];        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 = [Stick stickNormal];            stickNormal.position = stickShorter.position;            [stickShorter removeFromParent];            [physicsWorld addChild:stickNormal];            gameScene.stickInGameScene = stickNormal;        }    } delay:10];}

大家可以和变长的对应代码对比下,基本都是一样的.

下面编译运行游戏,效果如下:

这里写图片描述

大家可以在变短和变长中添加更多的特效,脑洞打开吧,童鞋们 ;)

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