facexy makes a turtle change its direction (heading) to point towards a given coordinate (x,y). For example, ask turtles [ facexy 0 0 ] turns all turtles in a model to face the center of the model.

Things to keep in mind when using facexy:

• facexy doesn't change a turtle's position, only its heading.
• If a turtle is already on the given point (x, y), it will not change its heading.

In the model example below, there are some fish and a single patch of food. When the add food button is clicked, we change the pcolor of the patch at (3, -3) to white, which indicates a food and we ask the fish to look at this coordinate in order to indicate that they turn to the food.