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package com.jme3.math;

import org.junit.Test;

/**
 * Verify that a Triangle center and normal get recomputed after a change. This
 * was issue #957 at GitHub.
 *
 * @author Stephen Gold
 */
public class TestIssue957 {

    final private Vector3f v0 = new Vector3f(0f, 0f, 0f);
    final private Vector3f v1 = new Vector3f(3f, 0f, 0f);
    final private Vector3f v2 = new Vector3f(0f, 3f, 0f);

    @Test
    public void testIssue957() {
        Vector3f v3 = new Vector3f(0f, 0f, 3f);

        Triangle t1 = makeTriangle();
        t1.set(2, v3);
        checkTriangle(t1);

        Triangle t2 = makeTriangle();
        t2.set(v3, v0, v1);
        checkTriangle(t2);

        Triangle t3 = makeTriangle();
        t3.set(2, v3.x, v3.y, v3.z);
        checkTriangle(t3);

        Triangle t4 = makeTriangle();
        t4.set3(v3);
        checkTriangle(t4);
    }

    private Triangle makeTriangle() {

        Triangle triangle = new Triangle(v0, v1, v2);
        /*
         * Check center and normal before modification.
        */
        Vector3f center = triangle.getCenter();
        Vector3f normal = triangle.getNormal();
        assert center.equals(new Vector3f(1f, 1f, 0f));
        assert normal.equals(new Vector3f(0f, 0f, 1f));

        return triangle;
    }

    /**
     * Check center and normal after modification.
    */
    private void checkTriangle(Triangle triangle) {
        Vector3f center = triangle.getCenter();
        Vector3f normal = triangle.getNormal();
        assert center.equals(new Vector3f(1f, 0f, 1f));
        assert normal.equals(new Vector3f(0f, -1f, 0f));
    }
}