用SpriteKit创建一条直线

Question

How can I create a straight line using SpriteKit and UITouch ?

I wanted a method that allowed me to add the start point and the end point instead of a path. Just like a rubber band.

Answer 1

1. Create a SKShapeNode that is a line when user begins the touch movement eg in touchesBegan: .

    SKShapeNode *line = [SKShapeNode node]; CGPoint startPoint = CGPointMake(..., ...) CGPoint endPoint = CGPointMake(..., ...) CGMutablePathRef pathToDraw = CGPathCreateMutable(); CGPathMoveToPoint(pathToDraw, NULL, startPoint.x, startPoint.y); CGPathAddLineToPoint(pathToDraw, NULL, endPoint.x, endPoint.y); line.path = pathToDraw; line.strokeColor = [UIColor redColor]]; [self addChild:line]; 

2. Modify its path to change its length in touchesMoved: