GD - Triangle.java

package gd;

/**
 * A specific shape: A triangle.
 * This triangle inherits from shape
 * @author hypesystem
 * @email  [email protected]
 */
public class Triangle extends Shape {
    private double a, b, c;

    /**
     * Creates a triangle witout a coordinate argument (sets coordinates to 0,0)
     * @param a side of triangle
     * @param b side of triangle
     * @param c side of triangle
     */
    public Triangle(double a, double b, double c) {
        super(new Coordinate(0,0));
        setAttr(a,b,c);
    }

    /**
     * Creates a triangle with a coordinate argument.
     * @param a side of triangle
     * @param b side of triangle
     * @param c side of triangle
     * @param coordinates coordinates of triangle
     */
    public Triangle(double a, double b, double c, Coordinate coordinates) {
        super(coordinates);
        setAttr(a,b,c);
    }

    /**
     * Sets the attributes of the Triangle. Called from constructors (hence
     * private)
     * @param a side of triangle
     * @param b side of triangle
     * @param c side of triangle
     */
    private void setAttr(double a, double b, double c) {
        this.a = a;
        this.b = b;
        this.c = c;
    }

    /**
     * Calculates and returns the circumference of the triangle. Inherited from
     * Shape.
     * @return circumference of triangle
     */
    @Override
    public double circumference() {
        return a + b + c;
    }

    /**
     * Calculates and returns the area of the triangle. Inherited from Shape.
     * @return area of triangle
     */
    @Override
    public double area() {
        double s = (a + b + c) / 2;
        return Math.sqrt(s * (s - a) * (s - b) * (s - c));
    }

    /**
     * Counts the amount of simple shapes in this shape. This is a simple shape.
     * Inherited from Shape.
     * @return 1
     */
    @Override
    public int countSimple() {
        return 1;
    }
}