this.height = height;
this.numIterations = numIterations;
this.angleIncrement = angleInc * Math.PI / 180;
this.scaleFactor = scaleFactor;
LExpressionParser parser = new LExpressionParser();
try {
root = parser.parse(expression);
}
catch (Exception e){
throw new IllegalArgumentException(e.getMessage(), e);
}
this.scale = scale;