def __init__(self, config):
# general world configuration
self.config = config
# To derive the formula for calculating jump speed, first solve
# v_t = v_0 + a * t
# for the time at which you achieve maximum height, where a is the acceleration
# due to gravity and v_t = 0. This gives:
# t = - v_0 / a
# Use t and the desired MAX_JUMP_HEIGHT to solve for v_0 (jump speed) in
# s = s_0 + v_0 * t + (a * t^2) / 2
self.jump_speed = math.sqrt(2 * self.config['gravity'] * self.config['max_jump_height'])
# When flying gravity has no effect and speed is increased.
self.flying = False
# Strafing is moving lateral to the direction you are facing,
# e.g. moving to the left or right while continuing to face forward.
#
# First element is -1 when moving forward, 1 when moving back, and 0
# otherwise. The second element is -1 when moving left, 1 when moving
# right, and 0 otherwise.
self.strafe = [0, 0]
# This is strafing in the absolute up/down position, not
# relative to where the player is facing. 1 when moving up, -1 when moving down
self.strafe_z = 0
# Current (x, y, z) position in the world, specified with floats. Note
# that, perhaps unlike in math class, the y-axis is the vertical axis.
self.position = (0, 5, 0)
# First element is rotation of the player in the x-z plane (ground
# plane) measured from the z-axis down. The second is the rotation
# angle from the ground plane up. Rotation is in degrees.
#
# The vertical plane rotation ranges from -90 (looking straight down) to
# 90 (looking straight up). The horizontal rotation range is unbounded.
self.rotation = (0, 0)
# Velocity in the y (upward) direction.
self.dy = 0
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