// Plugin for ImageJ to create ClockDrop Montage

// Input images must be cropped square beforehand

// Images should be loaded as a stack



//  ***EDIT THESE VALUES
***
	w = 740;		// width and height of image stack
	slices = 180;		// number of images to combine (can be less than number in stack)

	angle=1.5*PI;		// start angle, in radians
	dtheta = 2*PI/slices;	// angle increment between consecutive sectors

	di = 1;			// increment between images in stack
// ***STOP EDITING***



x0=w/2;				// centre of image
diag = w/1.4142         	// distance to corner from centre
orig=getImageID(); 		// identifier for the image stack
newImage("new", "8-bit black", w, w, 1);
				// create new blank image the same size as the stack
new=getImageID();		// identifier for the new blank image
selectImage(orig);		// select the stack



				// loop to rotate through 360 degrees

				// copy adjacent sectors from stack paste into new image

for(i=1; i <= slices*di ; i=i+di)
{
	x1 = x0 + diag*sin(angle);
	if(x1<0)  x1=0;
	if(x1>w)  x1=w;
	y1 = x0 - diag*cos(angle);
	if(y1<0)  y1=0;
	if(y1>w)  y1=w;
	x2 = x0 + diag*sin(angle+dtheta);
	if(x2<0)  x2=0;
	if(x2>w)  x2=w;
	y2 = x0 - diag*cos(angle+dtheta);
	if(y2<0)  y2=0;
	if(y2>w)  y2=w;
	selectImage(orig);
	setSlice(i);
	makePolygon(x0,x0,x1,y1,x2,y2);
	run("Copy");
	selectImage(new);
	makePolygon(x0,x0,x1,y1,x2,y2);
	run("Paste");
	angle = angle + dtheta;
}