Converting array of CGPoints to a bmp

[kylej]

I hope this is an easy one, I've searched the web to no avail.
I have an array (lines) that houses more arrays (points). I want to turn this into a bmp.
This is what I have going on (more verbosely)
I have a UIImage in my UIImage view that allows the user to draw

#import <UIKit/UIKit.h>
#import "SigCap.h"
#define POINT(X)	[[self.points objectAtIndex:X] CGPointValue]

UIColor *current;
@interface TouchView : UIView
{
	NSMutableArray *points;
}


@property (retain) NSMutableArray *points;
@end

@implementation TouchView
@synthesize points;


NSMutableArray *lines;

+(void)viewload
{
    lines=[NSMutableArray array];
    [lines retain];
}
- (BOOL) isMultipleTouchEnabled {return NO;}
// Start new array
- (void) touchesBegan:(NSSet *) touches withEvent:(UIEvent *) event
{
	self.points = [NSMutableArray array];
	CGPoint pt = [[touches anyObject] locationInView:self];
	[self.points addObject:[NSValue valueWithCGPoint:pt]];
}

// Add each point to array
- (void) touchesMoved:(NSSet *) touches withEvent:(UIEvent *) event
{
	CGPoint pt = [[touches anyObject] locationInView:self];
	[self.points addObject:[NSValue valueWithCGPoint:pt]];
	[self setNeedsDisplay];
}
- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    [lines addObject:points];
    NSLog(@"%@", [lines lastObject]);
}

// Draw all points
- (void) drawRect: (CGRect) rect
{
	if (!self.points) return;
	
	CGContextRef context = UIGraphicsGetCurrentContext();
    
	[current set];
	CGContextSetLineWidth(context, 1.0f);
	if ([lines lastObject]) {
        for (int x = 0; x<([lines count]); x++) {
            for (int c = 0; c < ([[lines objectAtIndex:x]count] - 1); c++)
            {
                CGPoint pt1 = [[[lines objectAtIndex:x] objectAtIndex:c] CGPointValue];
                CGPoint pt2 = [[[lines objectAtIndex:x] objectAtIndex:(c+1)] CGPointValue];
                CGContextMoveToPoint(context, pt1.x, pt1.y);
                CGContextAddLineToPoint(context, pt2.x, pt2.y);
                CGContextStrokePath(context);
                             
            }
        }
    }

	for (int i = 0; i < (self.points.count - 1); i++)
	{
		CGPoint pt1 = POINT(i);
		CGPoint pt2 = POINT(i+1);
		CGContextMoveToPoint(context, pt1.x, pt1.y);
		CGContextAddLineToPoint(context, pt2.x, pt2.y);
		CGContextStrokePath(context);
	}
    }

@end

So I get my array of arrays at the end of this, but I have no clue how to turn it into a bmp. Any help would be greatly appreciated