Draw a line with a CALayer

Question

I'm trying to draw a line between two points using a CALayer. Here is my code: ``` //positions a CALayer to be a line between a parent node and its subnodes. -(void)makeLineLayer:(CALayer *)layer lineFromPointA:(CGPoint)pointA toPointB:(CGPoint)pointB{ NSLog([NSString stringWithFormat:@"Coordinates: 
 Ax: %f Ay: %f Bx: %f By: %f", pointA.x,pointA.y,pointB.x,pointB.y]); //find the length of the line: CGFloat length = sqrt((pointA.x - pointB.x) * (pointA.x - pointB.x) + (pointA.y - pointB.y) * (pointA.y - pointB.y)); layer.frame = CGRectMake(0, 0, 1, length); //calculate and set the layer's center: CGPoint center = CGPointMake((pointA.x+pointB.x)/2, (pointA.y+pointB.y)/2); layer.position = center; //calculate the angle of the line and set the layer's transform to match it. CGFloat angle = atan2f(pointB.y - pointA.y, pointB.x - pointA.x); layer.transform = CATransform3DMakeRotation(angle, 0, 0, 1); } ``` I know that the length is being calculated correctly, and I'm am pretty sure that t…

Accepted Answer

Try This...

```
-(void)makeLineLayer:(CALayer *)layer lineFromPointA:(CGPoint)pointA toPointB:(CGPoint)pointB
{
    CAShapeLayer *line = [CAShapeLayer layer];
    UIBezierPath *linePath=[UIBezierPath bezierPath];
    [linePath moveToPoint: pointA];
    [linePath addLineToPoint:pointB];
    line.path=linePath.CGPath;
    line.fillColor = nil;
    line.opacity = 1.0;
    line.strokeColor = [UIColor redColor].CGColor;
    [layer addSublayer:line];
}
```

Draw a line with a CALayer

Solution

Problem