Vivace Logo

VivaceLogoView.h

//
//  VivaceLogoView.h
//  zeon
//
//  Created by Richard Caetano on 4/2/12.
//  Copyright (c) 2012 Modal Software Corporation. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface VivaceLogoView : UIView

@property (atomic, retain) UIColor* logoColor; 

- (UIImage*)getImage;
- (void)writeToFile:(NSString*)filename;

@end

VivaceLogoView.m

//
//  VivaceLogoView.m
//  zeon
//
//  Created by Richard Caetano on 4/2/12.
//  Copyright (c) 2012 Modal Software Corporation. All rights reserved.
//

#import "VivaceLogoView.h"

@implementation VivaceLogoView

@synthesize logoColor;

- (void)dealloc
{
    self.logoColor = nil;
    
    [super dealloc];
}

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        self.backgroundColor = [UIColor clearColor];
        self.logoColor = [UIColor whiteColor];
    }
    return self;
}

- (void)drawRect:(CGRect)rect
{
    // draws the vivace logo - a cassette tape gear
    
    // helpers
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGFloat width = rect.size.width;
    CGFloat height = rect.size.height;
    CGFloat lineWidth = rect.size.width / 10;
    CGFloat padding = lineWidth / 2;
    
    // setup 
    CGContextSetStrokeColorWithColor(context, self.logoColor.CGColor);
    CGContextSetLineWidth(context, lineWidth);
    [self.logoColor setStroke];
    
    // draw circle
    UIBezierPath* circle = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(padding, padding, width - lineWidth, height - lineWidth)];
    circle.lineWidth = lineWidth;
    [circle stroke];
        
    // draw teeth (x = r cos(a), y = r sin(a))
    CGFloat radius = (width / 2) - padding;
    CGFloat inner_len = radius * 0.50;
    CGFloat offset = width / 2;
    for (CGFloat angle=0;angle<M_PI*2;angle+=(M_PI*2)/6)
    {
        CGContextMoveToPoint(context, cosf(angle) * inner_len + offset, sin(angle) * inner_len + offset);
        CGContextAddLineToPoint(context, cosf(angle) * radius + offset, sin(angle) * radius + offset);
    }
    
    CGContextStrokePath(context);
}

- (UIImage*)getImage
{
    UIGraphicsBeginImageContext(self.bounds.size);
    [self drawRect:self.bounds];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); 
    UIGraphicsEndImageContext();
    
    return image;
}

- (void)writeToFile:(NSString*)filename;
{
    NSData *imageData = UIImagePNGRepresentation([self getImage]);
    [imageData writeToFile:filename atomically:YES];    
}

@end