Hi, I want to make an application in which i want to make simple graph using NSObject class and using CGContext method. All lines should be displaying dynamically in X and Y-axis interval text also, i trying develop something like following code,

CGContextSetRGBStrokeColor(ctx, 2.0, 2.0, 2.0, 1.0);
    CGContextSetLineWidth(ctx, 2.0);
    //(number of lines)
    CGContextMoveToPoint(ctx, 30.0, 230.0);
    CGContextAddLineToPoint(ctx, 30.0, 440.0);

    //CGContextAddLineToPoint(ctx, 320.0, 420.0);
    //CGContextStrokePath(ctx);

    for(float x = 20.0; x <= 320.0; x++)
       {    
        CGContextSetRGBStrokeColor(ctx, 2.0, 2.0, 2.0, 1.0);   
        CGContextMoveToPoint(ctx, x, 420.0);    
        CGContextAddLineToPoint(ctx, x+45.0, 420.0);
        CGContextStrokePath(ctx);
           }

How i develop using above functions? Thanks.