The Koch snowflake is a fractal that is created by starting with a line segment, then recursively altering it as follows:

1. Divide the line segment into three segments of equal length.

2. Draw an equilateral triangle that has the middle segment from step 1 as its base.

3. Remove the line segment that is the base of the triangle from step 2.

Figure 12.17 shows the first several iterations of the snowflake.

Write a program to draw the Koch snowflake on a DrawingPanel recursively.