They leave pheromone trails to home and to food. You can click to add food.
Suggestions and forks welcome! I would like to add collision detection, obstacles, and a pheromone pen and eraser.
I was wondering why my ants were making zigzag paths instead of straight lines to the food, but then I remembered that they can travel faster diagonally (1,1) than straight (0,1)... so they _are_ making an optimal path in their pixel-constrained world. I'm so proud of the little buggers.