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+DLA Algorithm
+-------------
+
+The algorithm works like this:
+
+1. The initial "seed" pixels are drawn.
+
+2. Each particle starts on the edge of a circle whose center is the
+   center of the screen. The circle's radius depends on the number
+   of particles that have been rendered so far: radius is 15 for
+   particles 1 to 100, 30 for particles 101 to 300, 45 for particles
+   301 to 600, and 75 for particles 601 and up.
+
+3. Walk the particle around randomly. For each step, pick a random one
+   of the 4 cardinal directions (no diagonals).
+
+4. If the particle goes "out of bounds" (see below), respawn it and
+   try again (without incrementing the particle counter).
+
+5. If the particle is ever adjacent to a set pixel, it gets stuck
+   there, the particle counter is incremented, and we go back to step 2.
+
+When the particle counter reaches the max (the number the user
+entered), the process is complete.