fillRule doesn't do anything about c4ios HOT 1 CLOSED

#import "C4WorkSpace.h"

@implementation C4WorkSpace {
    C4Shape *polygon;
}

-(void)setup {
    CGPoint pointArray[7] = {
        CGPointMake(100,100),
        CGPointMake(200,200),
        CGPointMake(150,250),
        CGPointMake(100,200),
        CGPointMake(200,100),
        CGPointMake(225,125),
        CGPointMake(100,250)
    };

    polygon = [C4Shape polygon:pointArray pointCount:7];
    polygon.lineWidth = 10.0f;
    [self.canvas addShape:polygon];
}

-(void)touchesBegan {
    if([polygon.fillRule isEqualToString:FILLNORMAL]) {
        polygon.fillRule = FILLEVENODD;
        polygon.lineCap = CAPROUND;
        polygon.lineJoin = JOINROUND;
    } else {
        polygon.fillRule = FILLNORMAL;
        polygon.lineJoin = JOINBEVEL;
        polygon.lineCap = CAPBUTT;
    }
}

@end