public void draw() {
    double x0, x1, x2, x3, y0, y1, y2, y3;

    x0 = posX + size * Math.cos(angle);
    x1 = posX + size * Math.cos(angle + Math.PI - 0.8);
    x2 = posX - (size / 3) * Math.cos(angle);
    x3 = posX + size * Math.cos(angle + Math.PI + 0.8);

    y0 = posY + size * Math.sin(angle);
    y1 = posY + size * Math.sin(angle + Math.PI - 0.8);
    y2 = posY - (size / 3) * Math.sin(angle);
    y3 = posY + size * Math.sin(angle + Math.PI + 0.8);

    double[] shapeX = new double[] { x0, x1, x2, x3 };
    double[] shapeY = new double[] { y0, y1, y2, y3 };

    StdDraw.setPenColor(StdDraw.BLUE);
    StdDraw.filledCircle(posX, posY, size);

    StdDraw.setPenColor(StdDraw.WHITE);
    StdDraw.filledPolygon(shapeX, shapeY);
}