Pygame_Lighting_Engine/Pygame_Lights.py at main · LuckeyDuckey/Pygame_Lighting_Engine · GitHub

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import math as meth
import numpy as np

import pygame
from pygame.locals import *

pygame.init()

class LIGHT:
    def __init__(self, size, pixel_shader):
        self.size = size
        self.radius = size * 0.5
        self.render_surface = pygame.Surface((size, size))
        self.pixel_shader_surf = pixel_shader.copy()
        self.baked_pixel_shader_surf = pixel_shader.copy()
        self.render_surface.set_colorkey((0,0,0))

    def baked_lighting(self, tiles, x, y, reset_surface):
        if reset_surface: self.baked_pixel_shader_surf = self.pixel_shader_surf.copy()

        dx, dy = x - self.radius, y - self.radius

        for point in self.get_tiles(tiles, x, y):

            corners = self.get_corners(point, x, y)
            corners = [[corners[0][0] - dx, corners[0][1] - dy], [corners[1][0] - dx, corners[1][1] - dy], [corners[2][0] - dx, corners[2][1] - dy]]

            self.fill_shadows(self.baked_pixel_shader_surf, [corners[0], corners[1], self.get_intersection([self.radius] * 2, corners[1]), self.get_intersection([self.radius] * 2, corners[0]), corners[2]])

    def get_intersection(self, p1, p2):
        dx = p2[0] - p1[0]
        dy = p2[1] - p1[1]

        if dx == 0:
            return [p2[0], (0 if dy <= 0 else self.size)]

        if dy == 0:
            return [(0 if dx <= 0 else self.size), p2[1]]

        y_gradient = dy / dx
        y_intercept = p1[1] - (p1[0] * y_gradient)

        y_line = 0 if dx <= 0 else self.size
        y_intersection = [y_line, (y_gradient * y_line) + y_intercept]

        if y_intersection[1] >= 0 and y_intersection[1] <= self.size:
            return y_intersection

        x_gradient = dx / dy
        x_intercept = p1[0] - (p1[1] * x_gradient)

        x_line = 0 if dy <= 0 else self.size
        x_intersection = [(x_gradient * x_line) + x_intercept, x_line]

        if x_intersection[0] >= 0 and x_intersection[0] <= self.size:
            return x_intersection

    def fill_shadows(self, render_surface, points):
        render_points = [points[0],points[4],points[1],points[2],points[3]]

        if points[2][0] + points[3][0] not in [1000, 0] and points[2][1] + points[3][1] not in [1000, 0]:
            if abs(points[2][0] - points[3][0]) == self.size:

                if self.radius < points[2][1]:
                    render_points = [points[0], points[4], points[1], points[2], [0, self.size], [self.size, self.size], points[3]]

                if self.radius > points[2][1]:
                    render_points = [points[0], points[4], points[1], points[2], [self.size, 0], [0, 0], points[3]]

            elif abs(points[2][1] - points[3][1]) == self.size:

                if self.radius < points[2][0]:
                    render_points = [points[0], points[4], points[1], points[2], [self.size, self.size], [self.size, 0], points[3]]

                if self.radius > points[2][0]:
                    render_points = [points[0], points[4], points[1], points[2], [0, self.size], [0, 0], points[3]]

            else:
                if points[2][0] != self.size and points[2][0] != 0:
                    render_points = [points[0], points[4], points[1], points[2], [points[3][0], points[2][1]], points[3]]

                else:
                    render_points = [points[0], points[4], points[1], points[2], [points[2][0], points[3][1]], points[3]]

        pygame.draw.polygon(render_surface, (0,0,0), render_points)

    def get_corners(self, points, x, y):
        corners = [points[0], points[2], points[2]]

        if x >= points[1][0] and x <= points[0][0]:
            if y < points[1][1]: corners = [points[0], points[1], points[1]]
            if y > points[0][1]: corners = [points[2], points[3], points[3]]

        if y >= points[0][1] and y <= points[2][1]:
            if x < points[1][0]: corners = [points[1], points[2], points[2]]
            if x > points[0][0]: corners = [points[0], points[3], points[3]]

        if (x < points[1][0] and y < points[1][1]):
            corners = [points[0], points[2], points[1]]
        elif (x > points[0][0] and y > points[2][1]):
            corners = [points[0], points[2], points[3]]

        if (x > points[0][0] and y < points[1][1]):
            corners = [points[1], points[3], points[0]]
        elif (x < points[1][0] and y > points[2][1]):
            corners = [points[1], points[3], points[2]]

        return corners

    def get_tiles(self, tiles, x, y):
        points = []

        for rect in tiles:
            if (rect.x - x >= (-self.radius) - rect.width and rect.x - x <= self.radius) and (rect.y - y >= (-self.radius)-rect.height and rect.y - y <= self.radius):
                points.append([[rect.x+rect.width, rect.y], [rect.x, rect.y], [rect.x, rect.y+rect.height], [rect.x+rect.width, rect.y+rect.height]])

        return points

    def check_cast(self, points, dx, dy):
        render = False

        for point in points:

            try:
                color = self.pixel_shader_surf.get_at((int(point[0]-dx), int(point[1]-dy)))
            except:
                color = (0,0,0,255)

            if color != (0,0,0,255):
                render = True

        return render

    def main(self, tiles, display, x, y):
        self.render_surface.fill((0,0,0))
        self.render_surface.blit(self.baked_pixel_shader_surf, (0, 0))

        dx, dy = x - self.radius, y - self.radius

        for point in self.get_tiles(tiles, x, y):

            if self.check_cast(point, dx, dy):

                corners = self.get_corners(point, x, y)
                corners = [[corners[0][0] - dx, corners[0][1] - dy], [corners[1][0] - dx, corners[1][1] - dy], [corners[2][0] - dx, corners[2][1] - dy]]

                self.fill_shadows(self.render_surface, [corners[0], corners[1], self.get_intersection([self.radius] * 2, corners[1]), self.get_intersection([self.radius] * 2, corners[0]), corners[2]])

        display.blit(self.render_surface, (x - self.radius, y - self.radius), special_flags=BLEND_RGBA_ADD)

        return display

def global_light(size, intensity):
    dark = pygame.Surface(size).convert_alpha()
    dark.fill((255, 255, 255, intensity))
    return dark

def pixel_shader(size, color, intensity, point, angle=0, angle_width=360):
    final_array = np.full((size, size, 3), color, dtype=np.float64)
    radius = size * 0.5

    # Grid -----
    x, y = np.meshgrid(np.arange(size), np.arange(size))
    x = x.astype(np.float64)
    y = y.astype(np.float64)
    #-----

    # Radial -----
    distance = np.sqrt((x - radius)**2 + (y - radius)**2)
    radial_falloff = (radius - distance) * (1 / radius)
    radial_falloff[radial_falloff <= 0] = 0
    #-----

    # Angular -----
    if not point:
        angular_falloff = 1

    else:
        point_angle = (180 / np.pi) * -np.arctan2((radius - x), (radius - y)) + 180
        diff_angle = np.abs(((angle - point_angle) + 180) % 360 - 180)
        angular_falloff = ((angle_width / 2) - diff_angle) * (1 / angle_width)
        angular_falloff[angular_falloff <= 0] = 0
    #-----

    final_intensity = radial_falloff * angular_falloff * intensity
    final_array *= final_intensity[..., np.newaxis]

    return pygame.surfarray.make_surface(final_array.astype(np.uint8))