How to use "DEGREE" in my iOS application

Question

Hi I need to make a 2D arch. Where I am getting a problem here

arc.path=[UIBezierPath bezierPathWithArcCenter:CGPointMake(50, 100)
                                                  radius:80.0
                                                  startAngle:DEGREE(65)
                                                  endAngle:DEGREE(90)
                                                  clockwise:NO].CGPath;

I am getting an error that

Undefined symbols for architecture i386: "_DEGREE", referenced from:

I know I have not included some header file, May I know which one is to include?

Anoop Vaidya · Accepted Answer · 2012-12-28T18:26:20.463

10

DEGREE is macro, not a method!!!

As you can easily guess by its name. Naming conventions come into play

You have to define it might be as :

#define DEGREES_TO_RADIANS(angle) ((angle) / 180.0 * M_PI)

or

#define DEGREE(angle) ((angle) / 180.0 * M_PI)

edited Dec 28 '12 at 18:26

answered Dec 28 '12 at 12:01

Anoop Vaidya

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I prefer RADIANS_FROM_DEGREES() – Jonny Aug 04 '14 at 08:02

score 7 · Answer 2 · answered Dec 28 '12 at 12:02

7

It should be custom macro you can also declare yourself and give it to your name. Try as following, put it anywhere in your header or implementation file.

#define DEGREE(radians) ((radians) * (180.0 / M_PI))

answered Dec 28 '12 at 12:02

Janak Nirmal

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score 0 · Answer 3 · answered Dec 28 '12 at 12:03

0

Hope it works for you...

(CGFloat) radians:(CGFloat) degrees
{
    CGFloat angle = degrees * M_PI / 180.0;
    return angle;
}

@Matthias Bauch: Thanks for the info.

answered Dec 28 '12 at 12:03

iCreative

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1

no need to redefine M_PI with something less accurate. M_PI is defined in math.h already. – Matthias Bauch Dec 28 '12 at 12:04

How to use "DEGREE" in my iOS application

3 Answers3