glow of the line + iphone

/*float glowWidth = 10.0;
     float colorValues[] = { 0, 0, 1, 1.0 };
     CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
     CGColorRef glowColor = CGColorCreate( colorSpace, colorValues );
     CGContextSetShadowWithColor( c, CGSizeMake( 0.0, 0.0 ), glowWidth, glowColor );*/