Target Strategy

quest.contrib.target_strategy.distance(a, b)

A helper function to find the distance between two points. Uses the pythagorean theorem!

Parameters

• a – (x, y) point

• b – (x, y) point

class quest.contrib.target_strategy.TargetStrategy

A strategy to go toward a target until the target is reached (or another condition is satisfied). Then re-choose the target.

epsilon

A distance to consider “close enough,” used to decide if the sprite reached its target. (If you insist on exactly reaching the target, the sprite will always overshoot a little, causing it to jiggle in place forever.)

choose_course(sprite, game)

Returns a (x, y) vector representing the chosen course.

First, makes sure the sprite has a target. Then checks to see if a new target is needed. If so, chooses a new target. If not, sets the course toward the target.

setup_sprite(sprite, game)

Makes sure the sprite has a target set.

Parameters

sprite – The sprite who is about to act.

needs_new_target(sprite, game)

Decides whether the sprite needs a new target. By default, a sprite needs a new target if it has (nearly) reached its original target.

choose_new_target(sprite, game)

Chooses a new target and applies it to the sprite. By defualt, this does nothing. Subclasses of TargetStrategy should re-implement this method for desired behavior.

course_to_target(sprite, game)

Returns a (x, y) vector representing the direction to the target.