ios – 肖像中的Parallax滚动精灵套件

2023年4月5日 121次阅读

我正在为iOS开发SpriteKit游戏,我正在学习通过阅读Ray Wenderlich教程(Space Shooter SpriteKit)来构建游戏

但是我想在纵向模式下制作应用程序,因此我希望背景从上到下移动.

    #pragma mark - TBD - Game Backgrounds
    //1
    NSArray *parallaxBackgroundNames = @[@"bg_galaxy.png", @"bg_planetsunrise.png",
                                         @"bg_spacialanomaly.png", @"bg_spacialanomaly2.png"];
    CGSize planetSizes = CGSizeMake(200.0, 200.0);
    //2
    _parallaxNodeBackgrounds = [[FMMParallaxNode alloc] initWithBackgrounds:parallaxBackgroundNames
                                                                       size:planetSizes
                                                       pointsPerSecondSpeed:10.0];
    //3
    _parallaxNodeBackgrounds.position = CGPointMake(size.width/2.0, size.height/2.0);
    //4
    [_parallaxNodeBackgrounds randomizeNodesPositions];

    //5
    [self addChild:_parallaxNodeBackgrounds];

    //6
    NSArray *parallaxBackground2Names = @[@"bg_front_spacedust.png",@"bg_front_spacedust.png"];
    _parallaxSpaceDust = [[FMMParallaxNode alloc] initWithBackgrounds:parallaxBackground2Names
                                                                 size:size
                                                 pointsPerSecondSpeed:25.0];
    _parallaxSpaceDust.position = CGPointMake(0,0);
    [self addChild:_parallaxSpaceDust];

编辑：

我能够从上到下移动,但它不会顺利移动.

    #pragma mark - TBD - Game Backgrounds
    for (int i = 0; i < 2; i++) {
        SKSpriteNode * bg = [SKSpriteNode spriteNodeWithImageNamed:@"background"];
        bg.anchorPoint = CGPointZero;
        bg.position = CGPointMake(0, i * bg.size.height);
        bg.name = @"background";
        [self addChild:bg];
    }


    -(void)update:(NSTimeInterval)currentTime {
        [self enumerateChildNodesWithName:@"background" usingBlock: ^(SKNode *node, BOOL *stop) {
            SKSpriteNode *bg = (SKSpriteNode *) node;
            bg.position = CGPointMake(bg.position.x, bg.position.y-5);

            if (bg.position.y <= -bg.size.height) {
                bg.position = CGPointMake(bg.position.x , bg.position.y + bg.size.height * 2);
            }
        }];
    }

最佳答案 我还没有测试过您的代码,但是每帧可能有5个点太多,无法顺利移动背景节点？

尝试计算每帧移动的点数：

@implementation GameScene
{
    NSTimeInterval _lastUpdateTime;
    NSTimeInterval _deltaTime;        
}

-(void)update:(NSTimeInterval)currentTime {
    if (_lastUpdateTime) {
        _deltaTime = currentTime - _lastUpdateTime;
    } else {
        _deltaTime = 0;
    }
    _lastUpdateTime = currentTime;

    CGPoint bgVelocity = CGPointMake(0.0, -50.0); // Current speed is 50 points per second
    CGPoint amtToMove = CGPointMake(bgVelocity.x * _deltaTime, bgVelocity.y * _deltaTime);

    [self enumerateChildNodesWithName:@"background" usingBlock: ^(SKNode *node, BOOL *stop) {
        SKSpriteNode *bg = (SKSpriteNode *) node;
        bg.position = CGPointMake(bg.position.x+amtToMove.x, bg.position.y+amtToMove.y);

        if (bg.position.y <= -bg.size.height) {
            bg.position = CGPointMake(bg.position.x , bg.position.y + bg.size.height * 2);
        }
    }];
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