ImageJ macro language : Around a fixed point, get the x,y corrdinates of the points rotating around the center at a defined distance

rotateLineAroundCenter.ijm

/*
 * Use of the custom function rotateLine(...) 
 * Around a fixed point, get the x,y corrdinates 
 * of the points rotating around the Center at a defined distance
 * 
 */

selectWindow("blobs.gif");

// Center Point coordinates 
x = 105 ; 
y = 110 ;

// Line length 
length = 20 ; //(in pixels)

// Angle step 
step = 15 ; // (in degrees )

for (i_angle = 0; i_angle < 360; i_angle+=step) {
	rotateLine(x,y,length, i_angle);
	wait(100); // to slow down the process so we can observe the line rotating clockwise
}

// 
function rotateLine(x,y,length,angle){
	angleRad = angle* 2*PI/360;
	x2 = x + length * cos (angleRad);
	y2 = y + length * sin (angleRad);
	makeLine(x, y, x2, y2);
}