Method Line

java/Chapter 7/Question7_6/Line.java:10–18

(GraphPoint p, GraphPoint q)

	private boolean infinite_slope = false;
	
	public Line(GraphPoint p, GraphPoint q) {
		if (Math.abs(p.x - q.x) > epsilon) { // if x�s are different
			slope = (p.y - q.y) / (p.x - q.x); // compute slope
			intercept = p.y - slope * p.x; // y intercept from y=mx+b
		} else {
			infinite_slope = true;
			intercept = p.x; // x-intercept, since slope is infinite
		}
	}
	
	public boolean isEquivalent(double a, double b) {
		return (Math.abs(a - b) < epsilon);