CGContext is not drawing my shape

Question

I'm trying to draw a hexagon in a UIView. I do this by overriding the drawRect method in my subclass of UIView. But when the view is shown I only see the backgroundColor of the view but I don't see my shape being drawn in it.

This is the code in my -drawRect method

CGContextRef context = UIGraphicsGetCurrentContext();

    CGContextSetFillColor(context, CGColorGetComponents([_fillColor CGColor]));

    NSArray *points = _hex.points;

    CGPoint point = [points[0] CGPointValue];
    CGContextMoveToPoint(context, point.x, point.y);

    for (int i = 1; i < [points count]; i++){
        CGContextAddLineToPoint(context, point.x, point.y);
    }


    CGContextClosePath(context);
    CGContextDrawPath(context, kCGPathFill);

The array that is being drawn is the following:

  NSMutableArray *mutablePoints = [NSMutableArray arrayWithCapacity:6];
    [mutablePoints addObject:[NSValue valueWithCGPoint:CGPointMake(40, 0)]];
    [mutablePoints addObject:[NSValue valueWithCGPoint:CGPointMake(59, 0)]];
    [mutablePoints addObject:[NSValue valueWithCGPoint:CGPointMake(68.5, 16.4544)]];
    [mutablePoints addObject:[NSValue valueWithCGPoint:CGPointMake(59, 32.9089)]];
    [mutablePoints addObject:[NSValue valueWithCGPoint:CGPointMake(40, 32.9089)]];
    [mutablePoints addObject:[NSValue valueWithCGPoint:CGPointMake(30.5, 16.4544)]];

When I run the app and add a breakpoint in the drawRect method I can see that the code is called, so I suggest that setNeedsDisplay was called. — wvp, Jul 29 '14 at 06:42

Jasmin · Answer 1 · 2014-07-29T09:01:24.527

0

Edit : you forgot online in for loop look this code

  for (int i = 1; i < [points count]; i++) {

        point = [points[i] CGPointValue]; // YOU FORGOT !

        CGContextAddLineToPoint(context, point.x, point.y);
    }

edited Jul 29 '14 at 09:01

answered Jul 29 '14 at 06:46

Jasmin

794
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can you provide your point array please so, i can implement it – Jasmin Jul 29 '14 at 07:00

score 0 · Answer 2 · answered Jul 29 '14 at 08:54

0

You don't change the point in yoour loop ! Just add:

point = [points[i] CGPointValue]

inside your loop ?

answered Jul 29 '14 at 08:54

Pierre Marty

166
1
7

CGContext is not drawing my shape

2 Answers2