package visitor;

/**
 * Concrete Visitor 2 — calculates perimeter.
 * Adding this visitor added zero code to Shape, Circle, Rectangle, Triangle.
 */
public class PerimeterCalculator implements ShapeVisitor {

    @Override
    public void visit(Circle c) {
        double p = 2 * Math.PI * c.getRadius();
        System.out.printf("  Perimeter of %s = %.2f%n", c.getName(), p);
    }

    @Override
    public void visit(Rectangle r) {
        double p = 2 * (r.getWidth() + r.getHeight());
        System.out.printf("  Perimeter of %s = %.2f%n", r.getName(), p);
    }

    @Override
    public void visit(Triangle t) {
        // Simplified: assume isoceles — base + 2 equal sides approximated
        double side = Math.sqrt(Math.pow(t.getBase() / 2, 2) + Math.pow(t.getHeight(), 2));
        double p = t.getBase() + 2 * side;
        System.out.printf("  Perimeter of %s = %.2f%n", t.getName(), p);
    }
}