Method countEquivalentLines

java/Chapter 7/Question7_6/Question.java:10–22

(ArrayList<Line> lines, Line line)

	
	/* Count lines within an array of lines which are "equivalent" (slope and y-intercept are within an epsilon value) to a given line */
	public static int countEquivalentLines(ArrayList<Line> lines, Line line) {
		if (lines == null) {
			return 0;
		}
		
		int count = 0;
		for (Line parallelLine : lines) {
			if (parallelLine.isEquivalent(line)) {
				count++;
			}
		}
		return count;		
	}
	
	/* Check hashmap for lines that are equivalent. Note that we need to check one epsilon above and below the actual slope
	 * since we're defining two lines as equivalent if they're within an epsilon of each other.