Multiple dynamic graphing

CPCustomView.m

//
//  GOCustomView.m
//  CustomViewExample
//
//  Created by Cassidy Pangell on 8/26/11.
//  Copyright (c) 2011 __MyCompanyName__. All rights reserved.
//

#import "CPCustomView.h"
#include "math.h"
#define LENGTH 248
#define HEIGHT 250

@implementation CPCustomView
@synthesize bgColor = _bgColor;
@synthesize MVO_U_Points = _MVO_U_Points;
@synthesize MVO_D_Points = _MVO_D_Points;
@synthesize TCP_U_Points = _TCP_U_Points;
@synthesize TCP_D_Points = _TCP_D_Points;


- (void)setBgColor:(UIColor *)bgColor{
    [_bgColor release];
    _bgColor = [bgColor retain];
    [self setNeedsDisplay];
}


- (void)awakeFromNib{
    //self.bgColor = [UIColor orangeColor];
}

- (void)drawRect:(CGRect)rect
{

    [self.bgColor setFill];
    
    [self graphPoints:_MVO_D_Points];
    [self graphPoints:_MVO_U_Points];
    [self graphPoints:_TCP_D_Points];
    [self graphPoints:_TCP_U_Points];

}

-(void) graphPoints:(NSArray *)nsArray{

    CGContextRef context = UIGraphicsGetCurrentContext();
    NSUInteger count = [nsArray count];
    //NSLog(@"COUNT %i",count);
    
    CGFloat prevValX;
    CGFloat prevValY;
    CGFloat currValX;
    CGFloat currValY;
    CGFloat deltaX = LENGTH / (count - 1);
    
    //allocate data points for graph
    for(int i=1; i<count; i++){
       
        NSValue *currentPointValue = [nsArray objectAtIndex:i];
        CGPoint currentPoint = [currentPointValue CGPointValue];
        NSValue *previousPointValue = [nsArray objectAtIndex:i-1];
        CGPoint previousPoint = [previousPointValue CGPointValue];

        currValX = currentPoint.x + (deltaX * (i));
        currValY = currentPoint.y;
        
        prevValX = previousPoint.x + ((deltaX) * (i-1));
        prevValY = previousPoint.y;
        
       // NSLog(@"CurPoint %@", currentPointValue);
       // NSLog(@"PrevPoint %@", previousPointValue);
       // NSLog(@"curr (%f, %f) -- prev (%f, %f)", currValX, currValY, prevValX, prevValY);

        
        //Draw Points (better way to do this. Suggestions?)
        if (nsArray == _MVO_D_Points) {
           NSLog(@"MVO D");
            CGContextSetFillColorWithColor(context, [UIColor yellowColor].CGColor);
            CGContextFillEllipseInRect(context, CGRectMake(currValX-1.5, currValY-1.5, 3, 3));
            CGContextSetStrokeColorWithColor(context, [UIColor yellowColor].CGColor);
        }else if (nsArray == _MVO_U_Points){
           NSLog(@"MVO U");
            CGContextSetFillColorWithColor(context, [UIColor orangeColor].CGColor);
            CGContextFillEllipseInRect(context, CGRectMake(currValX-1.5, currValY-1.5, 3, 3));
            CGContextSetStrokeColorWithColor(context, [UIColor orangeColor].CGColor);
        }else if (nsArray == _TCP_D_Points){
           NSLog(@"TCP D");
            CGContextSetFillColorWithColor(context, [UIColor purpleColor].CGColor);
            CGContextFillEllipseInRect(context, CGRectMake(currValX-1.5, currValY-1.5, 3, 3));
            CGContextSetStrokeColorWithColor(context, [UIColor purpleColor].CGColor);
        }else{ //_TCP_U_Point
           NSLog(@"TCP U");
            CGContextSetFillColorWithColor(context, [UIColor redColor].CGColor);
            CGContextFillEllipseInRect(context, CGRectMake(currValX-1.5, currValY-1.5, 3, 3));
            CGContextSetStrokeColorWithColor(context, [UIColor redColor].CGColor);
        }
        
        CGContextBeginPath(context);
        CGContextMoveToPoint(context, prevValX, prevValY);
        CGContextAddLineToPoint(context, currValX, currValY);
        CGContextStrokePath(context);
    }
    
    //----- AXIS
    CGContextSetStrokeColorWithColor(context, [UIColor whiteColor].CGColor);
    CGContextBeginPath(context);
    
    //Vert Line
    CGContextMoveToPoint(context, 0, 0);
    CGContextAddLineToPoint(context, 0, 300);
    
    //Horiz Line
    CGContextMoveToPoint(context, 0, 300);
    CGContextAddLineToPoint(context, 300, 300);
    CGContextStrokePath(context); 
    //----- END AXIS
   }

@end