66 lines
2.5 KiB
Python
66 lines
2.5 KiB
Python
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#!/usr/bin/python3
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import pygame.draw
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from settings import *
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class Cache:
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def __init__(self):
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self.stacked_sprite_cache = {}
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self.viewing_angle = 360 // NUM_ANGLES
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self.outline_thickness = 4
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self.get_stacked_sprite_cache()
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def get_stacked_sprite_cache(self):
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for object_name in SPRITE_ATTRS:
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self.stacked_sprite_cache[object_name] = {
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"rotated_sprites": {}
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}
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attrs = SPRITE_ATTRS[object_name]
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layer_array = self.get_layer_array(attrs)
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self.run_prerender(object_name, layer_array, attrs)
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def run_prerender(self, object_name, layer_array, attrs):
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outline = attrs.get("outline", True)
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for angle in range(NUM_ANGLES):
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surface = pygame.Surface(layer_array[0].get_size())
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surface = pygame.transform.rotate(surface, angle * self.viewing_angle)
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sprite_surface = pygame.Surface([
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surface.get_width(),
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surface.get_height() + attrs["num_layers"] * attrs["scale"]
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])
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sprite_surface.fill(TRANSP_COLOR)
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sprite_surface.set_colorkey(TRANSP_COLOR)
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for i, layer in enumerate(layer_array):
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layer = pygame.transform.rotate(layer, angle * self.viewing_angle)
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sprite_surface.blit(layer, (0, i * attrs["scale"]))
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# get outline
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if outline:
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outline_coords = pygame.mask.from_surface(sprite_surface).outline()
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pygame.draw.polygon(sprite_surface, "black", outline_coords, self.outline_thickness)
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image = pygame.transform.flip(sprite_surface, True, True)
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self.stacked_sprite_cache[object_name]["rotated_sprites"][angle] = image
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def get_layer_array(self, attrs):
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# load sprite sheet
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sprite_sheet = pygame.image.load(attrs["path"]).convert_alpha()
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# scaling
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sprite_sheet = pygame.transform.scale(sprite_sheet, vec2(sprite_sheet.get_size()) * attrs["scale"])
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sheet_width, sheet_height = sprite_sheet.get_size()
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sprite_width = sheet_width // attrs["num_layers"]
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# new width to prevent error
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sheet_width = sprite_width * attrs["num_layers"]
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# get sprites
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layer_array = []
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for x in range(0, sheet_width, sprite_width):
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sprite = sprite_sheet.subsurface((x, 0, sprite_width, sheet_height))
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layer_array.append(sprite)
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return layer_array
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