269 lines
9.3 KiB
Cython
269 lines
9.3 KiB
Cython
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from ... import constants
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from ...osu_parser.mathhelper import clamp, sign
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cdef class DifficultyObject:
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"""
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Object that holds strain value etc.
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Handled in Difficulty.calculate_strainValues & Difficulty.update_hyperdash_distance.
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Used in Difficulty.calculate_difficulty
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"""
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cdef public float strain, last_movement
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cdef public float offset, player_width, scaled_position, hyperdash_distance
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cdef public object hitobject
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cdef public int error_margin, hyperdash
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def __init__(self, hitobject, player_width):
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"""
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Hitobject wrapper to do calculation with.
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hitobject -- Hitobject to wrap around (basic)
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player_width -- Catcher width (after determined by active mods)
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"""
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self.strain = 1
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self.offset = 0
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self.last_movement = 0
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self.hitobject = hitobject
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self.error_margin = constants.ABSOLUTE_PLAYER_POSITIONING_ERROR
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self.player_width = player_width
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self.scaled_position = self.hitobject.x * (constants.NORMALIZED_HITOBJECT_RADIUS / self.player_width)
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self.hyperdash_distance = 0
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self.hyperdash = False
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cpdef calculate_strain(self, object last, float time_rate):
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"""
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Calculate strain value by refering last object.
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(and sets offset & last_movement info)
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last -- Previous hitobject
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time_rate -- Timescale from enabled mods
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"""
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cdef float time = (self.hitobject.time - last.hitobject.time) / time_rate
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cdef float decay = constants.DECAY_BASE ** (time / 1000)
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self.offset = clamp(last.scaled_position + last.offset,
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self.scaled_position - (constants.NORMALIZED_HITOBJECT_RADIUS - self.error_margin),
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self.scaled_position + (constants.NORMALIZED_HITOBJECT_RADIUS - self.error_margin)
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) - self.scaled_position
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self.last_movement = abs(self.scaled_position - last.scaled_position + self.offset - last.offset)
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cdef float addition = (self.last_movement ** 1.3) / 500
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if self.scaled_position < last.scaled_position:
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self.last_movement *= -1
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cdef float addition_bonus = 0
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cdef float sqrt_time = max(time, 25) ** 0.5
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if abs(self.last_movement) > 0.1:
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if abs(last.last_movement) > 0.1 and sign(self.last_movement) != sign(last.last_movement):
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bonus = constants.DIRECTION_CHANGE_BONUS / sqrt_time
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bonus_factor = min(self.error_margin, abs(self.last_movement)) / self.error_margin
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addition += bonus * bonus_factor
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if last.hyperdash_distance <= 10:
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addition_bonus += 0.3 * bonus_factor
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addition += 7.5 * min(abs(self.last_movement), constants.NORMALIZED_HITOBJECT_RADIUS * 2) / (constants.NORMALIZED_HITOBJECT_RADIUS * 6) / sqrt_time
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if last.hyperdash_distance <= 10:
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if not last.hyperdash:
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addition_bonus += 1
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else:
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self.offset = 0
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addition *= 1 + addition_bonus * ((10 - last.hyperdash_distance) / 10)
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addition *= 850 / max(time, 25)
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self.strain = last.strain * decay + addition
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cdef class Difficulty:
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"""
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Difficulty object for calculating star rating.
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Stars: self.star_rating
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"""
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cdef public object beatmap
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cdef public int mods
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cdef public list hitobjects_with_ticks, difficulty_objects
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cdef public float time_rate, player_width, star_rating
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def __init__(self, beatmap, mods):
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"""
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CTB difficulty calculator params.
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Calculates the star rating for the given beatmap.
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beatmap -- Beatmap object of parsed beatmap
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mods -- Int representation of mods selected / bitmask
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"""
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self.beatmap = beatmap
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self.mods = mods
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#Difficulty modifier by mod
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cdef str diff
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for diff in self.beatmap.difficulty.keys():
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if diff == "CircleSize":
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scala = 1.3
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else:
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scala = 1.4
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self.beatmap.difficulty[diff] = self.adjust_difficulty(self.beatmap.difficulty[diff], self.mods, scala)
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cdef object hitobject
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self.hitobjects_with_ticks = []
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for hitobject in self.beatmap.hitobjects:
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self.hitobjects_with_ticks.append(hitobject)
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if 2 & hitobject.type:
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for tick in hitobject.ticks:
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self.hitobjects_with_ticks.append(tick)
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for end_tick in hitobject.end_ticks:
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self.hitobjects_with_ticks.append(end_tick)
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self.difficulty_objects = []
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#Do the calculation
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self.time_rate = self.get_time_rate()
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self.player_width = 305 / 1.6 * ((102.4 * (1 - 0.7 * (self.beatmap.difficulty["CircleSize"] - 5) / 5)) / 128) * 0.7
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for hitobject in self.hitobjects_with_ticks:
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self.difficulty_objects.append(DifficultyObject(hitobject, self.player_width * 0.4))
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self.update_hyperdash_distance()
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#Sort the list so its sorted by time (Incase it somehow isnt)
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self.difficulty_objects.sort(key=lambda o: o.hitobject.time)
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self.calculate_strain_values()
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self.star_rating = (self.calculate_difficulty() ** 0.5) * constants.STAR_SCALING_FACTOR
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def adjust_difficulty(self, diff, mods, scala):
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"""
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Scale difficulty from selected mods.
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diff -- CircleSize
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mods -- Int representation of mods selected / bitmask
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return -- Scaled difficulty
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"""
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if mods & 1 << 1 > 0: #EZ
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diff = max(0, diff / 2)
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if mods & 1 << 4 > 0: #HR
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diff = min(10, diff * scala)
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return diff
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def get_time_rate(self):
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"""
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Get scaled time_rate from mods. (DT / HT)
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return -- time_rate
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"""
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rate = 1
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if self.mods & 1 << 6 > 0: #DT
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rate += 0.5
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elif self.mods & 1 << 8 > 0: #HT
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rate -= 0.25
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return rate
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cpdef update_hyperdash_distance(self):
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"""
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Update hyperdash_distance value for every hitobject in the beatmap.
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"""
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cdef int last_direction = 0, direction, i
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cdef float player_width_half = self.player_width / 2
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cdef float last = player_width_half
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cdef object current_object, next_object
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for i in range(len(self.difficulty_objects) - 1):
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current_object = self.difficulty_objects[i]
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next_object = self.difficulty_objects[i + 1]
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if next_object.hitobject.x > current_object.hitobject.x:
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direction = 1
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else:
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direction = -1
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time_to_next = next_object.hitobject.time - current_object.hitobject.time - 4.166667 #ms for 60fps divided by 4
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distance_to_next = abs(next_object.hitobject.x - current_object.hitobject.x)
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if last_direction == direction:
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distance_to_next -= last
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else:
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distance_to_next -= player_width_half
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if time_to_next < distance_to_next:
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current_object.hyperdash = True
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last = player_width_half
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else:
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current_object.hyperdash_distance = time_to_next - distance_to_next
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last = clamp(current_object.hyperdash_distance, 0, player_width_half)
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last_direction = direction
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cpdef calculate_strain_values(self):
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"""
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Calculate strain values for every hitobject.
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It does this by using distance, decay & previous hitobject strain value.
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Time_rate also effects this.
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"""
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cdef object current_object = self.difficulty_objects[0], next_object
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cdef index = 1
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while index < len(self.difficulty_objects):
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next_object = self.difficulty_objects[index]
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next_object.calculate_strain(current_object, self.time_rate)
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current_object = next_object
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index += 1
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cpdef float calculate_difficulty(self):
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"""
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Calculates the difficulty for this beatmap.
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This is used in the final function to calculate star rating.
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DISCLAIMER: This is not the final star rating value.
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return -- difficulty
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"""
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cdef float strain_step = constants.STRAIN_STEP * self.time_rate
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cdef list highest_strains = []
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cdef float interval = strain_step
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cdef float max_strain = 0
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cdef object last = None, difficulty_object
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for difficulty_object in self.difficulty_objects:
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while difficulty_object.hitobject.time > interval:
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highest_strains.append(max_strain)
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if last is None:
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max_strain = 0
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else:
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decay = (constants.DECAY_BASE ** ((interval - last.hitobject.time) / 1000))
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max_strain = last.strain * decay
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interval += strain_step
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if difficulty_object.strain > max_strain:
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max_strain = difficulty_object.strain
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last = difficulty_object
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cdef float difficulty = 0
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cdef float weight = 1
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#Sort from high to low strain
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highest_strains.sort(key=int, reverse=True)
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cdef float strain
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for strain in highest_strains:
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difficulty += weight * strain
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weight *= constants.DECAY_WEIGHT
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return difficulty
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