Home/ Questions/Q 7533401
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-30T05:42:54+00:00

I wanted to draw a line using CGContext and what I have so far

  • 0

I wanted to draw a line using CGContext and what I have so far is:

CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetStrokeColorWithColor(context, [UIColor blackColor].CGColor);
CGContextSetLineWidth(context, 1.0f);
CGContextMoveToPoint(context, 10, 10); 
CGContextAddLineToPoint(context, 100, 50);
CGContextStrokePath(context);

It always draws from the top left corner to the top bottom right corner. How can I adjust the start and end origin of this line? How do I adjust the length of the line?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    These two lines are responsible for the start and end points:

    CGContextMoveToPoint(context, 10, 10);    // This sets up the start point
CGContextAddLineToPoint(context, 100, 50); // This moves to the end point.

    By adjusting these two x, y points you can adjust the line. The length of the line depends on the start and end points.

    Following on from psoft’s answer – here’s a basic example project of drawing, including creating a path and stroking it.

    This is explained in more detail with more sample code in the Quartz 2D guide for paths.

    • 0