Sprite Kit中anchorPoint和position的使用

2017-01-14 10:45:41来源:http://www.jianshu.com/p/499ce31ac2f6作者:ayilimi人点击

anchorPoint:通过position来控制它的frame的位置,可以认为anchorPoint是用来移动图层的把柄
一般来说anchorPoint:位于图层的中心,但是图层的anchorPoint可以被移动.


好了,将锚点之前,先来了解下坐标系
常见的三维坐标系分为两种:左手坐标系和右手坐标系.当确定了x轴,y轴方向之后可以通过左手或右手来确定z轴的方向.



坐标系


拇指指向x轴正方向,食指指向y轴正方向,中指指向z轴正方向.左手坐标系使用左手,右手坐标系使用右手.在Mac ,iOS中有一点是不变的,z轴的正方向总是指向观察者,也就是垂直屏幕平面向上的
iOS系统在使用左手坐标,但是Sprite Kit使用右手坐标,Sprite Kit使用右手坐标,Sprite Kit使用右手坐标,重要的事情说三遍



iOS系统坐标


Sprite Kit坐标系


锚点的使用:锚点使用的是相对坐标,范围是从0.0 ~1.0
默认值为0.5


锚点和position关于自身的使用


//anchorPoint = (0.5,0.5);
SKSpriteNode *spaceship = [[SKSpriteNode alloc] initWithColor:[UIColor orangeColor] size:CGSizeMake(100, 100)];
spaceship.position = CGPointMake(300, 300);
spaceship.anchorPoint = CGPointMake(0.5, 0.5);
[self addChild:spaceship];


锚点的使用


这种图看的不是很清楚,使用坐标系创建



anchorPoint = (0.5,0.5),红色的点代表(300,300)
//anchorPoint = (1,0.5)
SKSpriteNode *spaceship = [[SKSpriteNode alloc] initWithColor:[UIColor orangeColor] size:CGSizeMake(100, 100)];
spaceship.position = CGPointMake(300, 300);
spaceship.anchorPoint = CGPointMake(1, 0.5);


anchorPoint = (1,0.5)
//anchorPoint = (0.5,1)
SKSpriteNode *spaceship = [[SKSpriteNode alloc] initWithColor:[UIColor orangeColor] size:CGSizeMake(100, 100)];
spaceship.position = CGPointMake(300, 300);
spaceship.anchorPoint = CGPointMake(0.5, 1);
[self addChild:spaceship];


anchorPoint = (0.5,1)

父视图上的锚点对子视图的影响


-(SKSpriteNode *)makeRedBox:(CGSize )size{
return [[SKSpriteNode alloc] initWithColor:[UIColor redColor] size:size];
}
-(SKSpriteNode *)makeGreenBox:(CGSize)size{
return [[SKSpriteNode alloc] initWithColor:[UIColor greenColor] size:size];
}
-(SKSpriteNode *)makeBlueBox:(CGSize)size{
return [[SKSpriteNode alloc] initWithColor:[UIColor blueColor] size:size];
}

pragma mark ---1
SKSpriteNode *box1 = [self makeRedBox:CGSizeMake(100, 100)];
box1.anchorPoint = CGPointMake(0, 0);
box1.position = CGPointMake(100, 100);
SKSpriteNode *box2 = [self makeBlueBox:CGSizeMake(50, 50)];
box2.anchorPoint = CGPointMake(0, 0);
box2.position = CGPointMake(0, 0);
[box1 addChild:box2];
SKSpriteNode *box3 = [self makeGreenBox:CGSizeMake(25, 25)];
box3.anchorPoint = CGPointMake(0, 0);
box3.position = CGPointMake(0, 0);
[box2 addChild:box3];
[self addChild:box1];



红色的anchorPoint(0,0):说明红色方块的左下角在(100,100)点,红色的坐标原点在左下角
蓝色的anchorPoint(0,0),position(0,0):说明蓝色的左下角在红色的(0,0)点,坐标原点在蓝色的左下角
绿色的anchorPoint(0,0),position(0,0):绿色的左下角在蓝色的(0,0)点位置

pragma mark ---二
SKSpriteNode *box1 = [self makeRedBox:CGSizeMake(100, 100)];
box1.anchorPoint = CGPointMake(0.5, 0.5);
box1.position = CGPointMake(100, 100);
SKSpriteNode *box2 = [self makeBlueBox:CGSizeMake(50, 50)];
box2.anchorPoint = CGPointMake(0, 0);
box2.position = CGPointMake(0, 0);
[box1 addChild:box2];
SKSpriteNode *box3 = [self makeGreenBox:CGSizeMake(25, 25)];
box3.anchorPoint = CGPointMake(0, 0);
box3.position = CGPointMake(0, 0);
[box2 addChild:box3];
[self addChild:box1];



红色的anchorPoint(0.5,0.5):说明红色方块的中心点在(100,100)点,红色的坐标原点(0,0)在红色的中心点
蓝色的anchorPoint(0,0),position(0,0):说明蓝色的左下角在红色的(0,0)点,坐标原点在蓝色的左下角
绿色的anchorPoint(0,0),position(0,0):绿色的左下角在蓝色的(0,0)点位置

pragma mark----三
SKSpriteNode *box1 = [self makeRedBox:CGSizeMake(100, 100)];
box1.anchorPoint = CGPointMake(0.5, 0.5);
box1.position = CGPointMake(100, 100);
SKSpriteNode *box2 = [self makeBlueBox:CGSizeMake(50, 50)];
box2.anchorPoint = CGPointMake(0, 0);
box2.position = CGPointMake(25, 25);
[box1 addChild:box2];
SKSpriteNode *box3 = [self makeGreenBox:CGSizeMake(25, 25)];
box3.anchorPoint = CGPointMake(0, 0);
box3.position = CGPointMake(0, 0);
[box2 addChild:box3];
[self addChild:box1];



红色的anchorPoint(0.5,0.5):说明红色方块的中心点在(100,100)点,红色的坐标原点(0,0)在红色的中心点
蓝色的anchorPoint(0,0),position(25,25):说明蓝色的左下角在红色的(25,25)点,坐标原点在蓝色的左下角
绿色的anchorPoint(0,0),position(0,0):绿色的左下角在蓝色的(0,0)点位置

pragma mark ---四
SKSpriteNode *box1 = [self makeRedBox:CGSizeMake(100, 100)];
box1.anchorPoint = CGPointMake(0.5, 0.5);
box1.position = CGPointMake(100, 100);
SKSpriteNode *box2 = [self makeBlueBox:CGSizeMake(50, 50)];
box2.anchorPoint = CGPointMake(0.5, 0.5);
box2.position = CGPointMake(25, 25);
[box1 addChild:box2];
SKSpriteNode *box3 = [self makeGreenBox:CGSizeMake(25, 25)];
box3.anchorPoint = CGPointMake(0, 0);
box3.position = CGPointMake(0, 0);
[box2 addChild:box3];
[self addChild:box1];






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