Create a line with two CGPoints SpriteKit Swift

Question

I am trying to make a simple app where you touch a point, and a sprite follows a line through that point to the edge of the screen, no matter where you touch. I want to draw lin

Answer 1

This can be done using CGPath and SKShapeNode.

Lets start with CGPath. CGPath is used when we need to construct a path using series of shapes or lines. Paths are line connecting two points. So to make a line:

1. moveToPoint: It sets the current point of the path to the specified point.
2. addLineToPoint: It draws a straight line from the current point to the specified point. or addCurveToPoint: It draws a curved line from the current point to the specified point based on certain tangents and control points.

You can check the documentation here: http://developer.apple.com/library/mac/#documentation/graphicsimaging/Reference/CGPath/Reference/reference.html

What you need to do is:

    var path = CGPathCreateMutable()
    CGPathMoveToPoint(path, nil, 100, 100)
    CGPathAddLineToPoint(path, nil, 500, 500)

Now to make the path visible, and give it attributes like stroke color, line width etc. you create a SKShapeNode in SpriteKit and add the path to it.

    let shape = SKShapeNode()
    shape.path = path
    shape.strokeColor = UIColor.whiteColor()
    shape.lineWidth = 2
    addChild(shape)

Hope this helps :).