package edu.stanford.rsl.tutorial.phantoms;
/**
* Simple class to show the Grid2D functionality. We use a Grid2D to create a uniform circle.
* We use this as a first phantom to investigate parallel beam projection and back-projection.
*
* @author Recopra Summer Semester 2012
*
*/
public class DotsGrid2D extends Phantom {
/**
* The constructor takes two arguments to initialize the grid. The circles will be in the center and have a random radius and position.
* @param x
* @param y
*/
public DotsGrid2D (int x, int y){
super(x,y,"DotsGrid2D");
for(int num=0; num<3; ++num){
// Create circle in the grid.
double radius = (0.1+Math.random()/3)*x;
int xcenter = x/((int)((0.2+Math.random())*5));
int ycenter = y/((int)((0.2+Math.random())*5));
float val = (float) Math.random();
if(0.2 > val) val = 0.2f;
for(int i = 0; i<x; i++) {
for(int j = 0; j<y; j++) {
if( Math.pow(i - xcenter, 2) + Math.pow(j - ycenter, 2) <= (radius*radius) ) {
super.setAtIndex(i, j, val);
}
}
}
}
}
}
/*
* Copyright (C) 2010-2014 Andreas Maier
* CONRAD is developed as an Open Source project under the GNU General Public License (GPL).
*/