Question

i’m stuck at this problem. I need to draw a line between the previous end point to next start point. My code for drawing a line between 2 points is

- (void)drawRect:(CGRect)rect
{
    CGContextRef c=UIGraphicsGetCurrentContext();
    CGContextSetLineWidth(c, 4.0);
    CGFloat red[4]={0.0f, 0.0f, 0.0f, 1.0f};
    CGContextSetStrokeColor(c, red);
    CGContextBeginPath(c);
    CGContextMoveToPoint(c, 50.0f, 50.0f);
    CGContextAddLineToPoint(c, 100.0f, 100.0f);
    CGContextStrokePath(c) ;
}

How can i give multiple points, so that i can it shows like a graph.
Thanks in advance

Answer 1

Just add more CGContextAddLineToPoint calls

- (void)drawRect:(CGRect)rect
{
    CGContextRef c=UIGraphicsGetCurrentContext();
    CGContextSetLineWidth(c, 4.0);
    CGFloat red[4]={0.0f, 0.0f, 0.0f, 1.0f};
    CGContextSetStrokeColor(c, red);
    CGContextBeginPath(c);
    CGContextMoveToPoint(c, 50.0f, 50.0f);
    CGContextAddLineToPoint(c, 100.0f, 100.0f);
    CGContextAddLineToPoint(c, 120.0f, 80.0f);
    CGContextAddLineToPoint(c, 140.0f, 120.0f);
    CGContextAddLineToPoint(c, 160.0f, 80.0f);
    ...

    CGContextStrokePath(c) ;
}