Spatial


distanceBetween(agentA, agentB, distanceFunction)

This function returns the distance between two agents, using a specific distance function. You can pass the current agent's state as one of the agents. The different distance functions are:

JavaScript
Python
function behavior(state, context) {
  const { neighborA, neighborB } = context.neighbors();

  // Find the closest of 2 neighbors to you
  const distanceToA = hstd.distanceBetween(state, neighborA);
  const distanceToB = hstd.distanceBetween(state, neighborB);
  state.closest = distanceToB > distanceToA ? "A" : "B";

  // Check if neighbors are closer to each other than to you
  const neighborDistance = hstd.distanceBetween(neighborA, neighborB);
  const selfDistance = state.closest === "A" ? distanceToA : distanceToB;

  state.closer_to_neighbors = selfDistance < neighborDistance;
}

normalizeVector(vec)

This function returns the unit vector of the vec array. You can use it to normalize an agent's direction vector after it's modified.

JavaScript
Python
function behavior(state, context) {
  const dir = state.direction;

  // Modify the direction by adding a vector [1, 2, 0]
  dir[0] += 1;
  dir[1] += 2;

  // Turn it back into a unit vector
  state.direction = hstd.normalizeVector(dir);
}

randomPosition(topology, z_plane)

This function returns a random integer position within the bounds of the topology. The Topology should be user-defined in globals.json (see Topology). By defaultz_plane is false and the returned position is in a 2D plane. Pass true to return a position in 3D space.

JavaScript
Python
function behavior(state, context) {
  // Move to a random position
  const topology = context.globals().topology;
  const new_pos = hstd.randomPosition(topology);

  state.position = new_pos;
}

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