Triangle.java

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package de.lathanda.eos.game.geom;
 
import java.util.Arrays;
 
import de.lathanda.eos.base.math.Point;
import de.lathanda.eos.base.math.Vector;
public class Triangle {
    private double[] x;
    private double[] y;
    public Triangle(double x1, double y1, double x2, double y2, double x3, double y3) {
        x = new double[] {x1, x2, x3};
        y = new double[] {y1, y2, y3};
    }
    public Triangle(double[] x, double[] y) {
        this.x = x;
        this.y = y;
    }
    public double getX(int i) {
        return x[i];
    }
    public double getY(int i) {
        return y[i];
    }
    @Override
    public String toString() {
        StringBuilder s = new StringBuilder("Triangle ");
        for(int i = 0; i < 3; i ++) {
            s.append("("+x[i]+"/"+y[i]+")");
        }
        return "Triangle [x=" + Arrays.toString(x) + ", y=" + Arrays.toString(y) + "]";
    }
    public double getArea() {
        return new Vector(x[1]-x[0], y[1]-y[0]).crossproduct(new Vector(x[1]-x[2], y[1]-y[2]))/2;
    }   
    public Point getCenter() {
        return new Point((x[0]+x[1]+x[2])/3, (y[0]+y[1]+y[2])/3);
    }
    public void move(double dx, double dy) {
        for(int i = 0; i < 3; i++) {
            x[i] += dx;
            y[i] += dy;
        }
        
    }
}