Examples of java.awt.Polygon.invalidate()

java.awt.Polygon.invalidate()
Invalidates or flushes any internally-cached data that depends on the vertex coordinates of this Polygon. This method should be called after any direct manipulation of the coordinates in the xpoints or ypoints arrays to avoid inconsistent results from methods such as getBounds or contains that might cache data from earlier computations relating to the vertex coordinates. @see java.awt.Polygon#getBounds @since 1.4

        Polygon pg = new Polygon(new int[]{1, 2, 3}, new int[]{4, 5, 6}, 3);
        assertEquals(new Rectangle(1, 4, 2, 2), pg.getBounds());
        pg.xpoints[0] = 0;
        pg.ypoints[0] = -1;
        assertEquals(new Rectangle(1, 4, 2, 2), pg.getBounds());
        pg.invalidate();
        assertEquals(new Rectangle(0, -1, 3, 7), pg.getBounds());
    }


    public void testAddPoint() {
        Polygon pg = new Polygon(new int[]{1, 2, 3, 4, 5, 6}, new int[]{7, 8, 9, 10, 11, 12}, 3);

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        Polygon pg = new Polygon(new int[]{1, 2, 3}, new int[]{4, 5, 6}, 3);
        assertEquals(new Rectangle(1, 4, 2, 2), pg.getBounds());
        pg.xpoints[0] = 0;
        pg.ypoints[0] = -1;
        assertEquals(new Rectangle(1, 4, 2, 2), pg.getBounds());
        pg.invalidate();
        assertEquals(new Rectangle(0, -1, 3, 7), pg.getBounds());
    }


    public void testAddPoint() {
        Polygon pg = new Polygon(new int[]{1, 2, 3, 4, 5, 6}, new int[]{7, 8, 9, 10, 11, 12}, 3);

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