package visitor;

/**
 * Concrete Visitor 1 — calculates area for each shape type.
 * Area formulas live here, not scattered across shape classes.
 */
public class AreaCalculator implements ShapeVisitor {

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

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

    @Override
    public void visit(Triangle t) {
        double area = 0.5 * t.getBase() * t.getHeight();
        System.out.printf("  Area of %s = %.2f%n", t.getName(), area);
    }
}