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我是Objective-c和sprite kit的新手,但我已经做了一段时间的游戏开发.我目前正在进行2D游戏,我的敌人船只在屏幕上从右向左移动.我一直在关注游戏不同部分的教程,然后在必要时添加它.我找到了一个教程,其中游戏中的敌人遵循bezier路径并且我已经设法在我的游戏中实现这一点但是因为我是bezier曲线的新手我不完全理解它们并且算法使我的精灵从上到下移动但我需要它们从左到右.

我已经包含了我用来将贝塞尔曲线添加到我的精灵的代码片段,有关我如何让它们从右到左而不是从上到下移动的任何建议.

CGMutablePathRef cgpath = CGPathCreateMutable();

        float xStart = [self getRandomNumberBetween:0+asteroid.size.width to:self.frame.size.width-asteroid.size.width];
        float xEnd = [self getRandomNumberBetween:0+asteroid.size.width to:self.frame.size.width-asteroid.size.width];
        float cp1X =[self getRandomNumberBetween:0+asteroid.size.width to:self.frame.size.width-asteroid.size.width];
        float cp1y = [self getRandomNumberBetween:0+asteroid.size.width to:self.frame.size.width-asteroid.size.height];
        float cp2x = [self getRandomNumberBetween:0+asteroid.size.width to:self.frame.size.width-asteroid.size.width];
        float cp2Y = [self getRandomNumberBetween:0 to:cp1y];

        CGPoint s = CGPointMake(xStart, 1024.0);
        CGPoint e = CGPointMake(xEnd, -100);
        CGPoint cp1 = CGPointMake(cp1X, cp1y);
        CGPoint cp2 = CGPointMake(cp2x, cp2Y);
        CGPathMoveToPoint(cgpath, NULL, s.x, s.y);
        CGPathAddCurveToPoint(cgpath, NULL, cp1.x, cp1.y, cp2.x, cp2.y, e.x, e.y);

        SKAction *enemyCurve = [SKAction followPath:cgpath asOffset:NO …