滚动背景 - Sprite Kit [英] Scrolling background - Sprite Kit

问题描述

所以我尝试通过使用这篇文章的解决方案(Sprite kit侧滚动).但是，我想让图像可重复.正如您在下面的视频中看到的那样，图像在水平方向完成后，有一些空白.我想让图像填补那个空白，所以无休止地重复.

So I tried to create an infinite scrolling background by using this post's solution (Sprite kit side scrolling). However, I would want to make the image repeatable. As you can see in the video below, after the image has finished it's horizontal way, there is some empty gap.. I would like to make the image fill that gap, so repeat it endlessly.

http://www.youtube.com/watch?v=kyLTGz7Irrc或者https://vimeo.com/79555900(密码:spritekit)

http://www.youtube.com/watch?v=kyLTGz7Irrc or https://vimeo.com/79555900 (password: spritekit)

我做了什么:

for (int i = 0; i < 2; i++) {
        SKSpriteNode * bg = [SKSpriteNode spriteNodeWithImageNamed:@"bgimage"];
        bg.anchorPoint = CGPointZero;
        bg.position = CGPointMake(CGRectGetMidX(self.frame), self.frame.origin.y);
        bg.name = @"snow1";
        [self addChild:bg];
 }

在更新方法中:

[self enumerateChildNodesWithName:@"snow1" usingBlock: ^(SKNode *node, BOOL *stop) {
        SKSpriteNode *bg = (SKSpriteNode *) node;
        bg.position = CGPointMake(bg.position.x - 5, bg.position.y);

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

推荐答案

不管怎样，我修好了.以防万一其他人需要它，我就是这样做的:

Anyway, I fixed it. Just in case someone else will need it, this is how I did it:

    // Create 2 background sprites
    bg1 = [SKSpriteNode spriteNodeWithImageNamed:@"bg1"];
    bg1.anchorPoint = CGPointZero;
    bg1.position = CGPointMake(0, 0);
    [self addChild:bg1];

    bg2 = [SKSpriteNode spriteNodeWithImageNamed:@"bg2"];
    bg2.anchorPoint = CGPointZero;
    bg2.position = CGPointMake(bg1.size.width-1, 0);
    [self addChild:bg2];

然后在更新方法中:

    bg1.position = CGPointMake(bg1.position.x-4, bg1.position.y);
    bg2.position = CGPointMake(bg2.position.x-4, bg2.position.y);

    if (bg1.position.x < -bg1.size.width)
        bg1.position = CGPointMake(bg2.position.x + bg2.size.width, bg1.position.y);

    if (bg2.position.x < -bg2.size.width) 
        bg2.position = CGPointMake(bg1.position.x + bg1.size.width, bg2.position.y);

这篇关于滚动背景 - Sprite Kit的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！