NSURLConnection, Draw a glow, Eliza AI

1. NSURLConnection

For those who were wondering about this (and I was).
Really, yes, NSURLConnection knows how to handle cookies and does it by default.
You don’t have to manage it by hand.

2. Draw a glow

If you want to reproduce visually the highlight you can see on a UIToolbar button, you can use the following code sniplet :

void evaluate(void *info,const float *in, float *output) {
	float                x=in[0];
	float                _C0[4]={1,1,1,0};
	float                _C1[4]={1,1,1,1};
	int                  i;
	float factor;

	x = 1 - x;
	float c = 0.3;
	float b = 1;
	factor = exp(-(x - b) * (x - b) / (2 * c * c));
	for(i=0;i<4;i++)
		output[i] = _C0[i]+factor*(_C1[i]-_C0[i]);
}

- (void) drawRect:(CGRect)rect
{
	CGColorSpaceRef space;
	CGFunctionRef function;
	CGShadingRef shading;
	float radius;
	float range[8]={0,1,0,1,0,1,0,1};
	float domain[2]={0,1};
	CGFunctionCallbacks callbacks={0,evaluate,NULL};
	CGPoint center;
	CGRect glowRect;
	CGContextRef context;

	glowRect = [self glowRect];
	context = UIGraphicsGetCurrentContext();

	CGContextSaveGState(context);
	CGContextTranslateCTM (context, CGRectGetMinX(glowRect),
						   CGRectGetMinY(glowRect));
	CGContextScaleCTM (context, glowRect.size.width, glowRect.size.height);

	space = CGColorSpaceCreateDeviceRGB();
	function = CGFunctionCreate(self,1,domain,4,range,&callbacks);

	radius = 0.5;
	center.x = 0.5;
	center.y = 0.5;
	shading = CGShadingCreateRadial(space, center, 0, center, radius, function, NO, YES);
	CGContextDrawShading(context, shading);
	CGShadingRelease(shading);
	CGColorSpaceRelease(space);

	CGContextRestoreGState(context);
}

3. Eliza AI

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