Attention-Management-Systems-for-Dynamic-Monitoring-Tasks/gaze_bubble.py at main · ciao-group/Attention-Management-Systems-for-Dynamic-Monitoring-Tasks · GitHub

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import pygame
import math
import random
import numpy as np
from utils import get_angle_between_vectors


class GazeBubble:

    def __init__(
        self,
        center: list[int | float],
        radius: int | float,
        color: tuple[int, int, int],
        line_thickness: int = 2,
        vertices: int = 8,
        max_size: int | float = 30,
        animation_speed: float = 0.70,
        speed: float = 60,
    ) -> None:

        self.center: list[int | float] = center
        self.radius: int | float = radius
        self.color: tuple[int, int, int] = color
        self.line_thickness: int = line_thickness
        self.vertices: int = vertices
        self.min_size: float = 2 * animation_speed + 3

        self.max_random_size: int | float = max_size
        self.min_random_size: int | float = self.max_random_size // 2
        self.animation_speed: float = animation_speed

        self.animation_counter = 0
        self.sizes: list[int | float] = [
            random.randint(int(self.min_random_size), int(self.max_random_size))
            for _ in range(self.vertices)
        ]

        self.points: list[tuple[int, int]] = self.calc_points()

        self.speed: float = speed
        self.direction: list[int] = [0, 0]

    def draw(self, screen: pygame.Surface) -> None:

        self.sizes = [
            (
                random.randint(int(self.min_random_size), int(self.max_random_size))
                if self.sizes[x] <= self.min_size
                else self.sizes[x] - self.animation_speed
            )
            for x in range(self.vertices)
        ]

        for i in range(-1, len(self.points) - 1):

            p1 = self.points[i]
            p2 = self.points[i + 1]

            l = math.sqrt((p2[0] - p1[0]) ** 2 + (p2[1] - p1[1]) ** 2)

            rect = pygame.Rect(0, 0, l, self.sizes[i])

            centerx = p1[0] + 0.5 * (p2[0] - p1[0])
            centery = p1[1] + 0.5 * (p2[1] - p1[1])

            surface = pygame.Surface(rect.size, pygame.SRCALPHA)

            if i % 2 == 0:

                pygame.draw.arc(
                    surface=surface,
                    color=self.color,
                    rect=rect,
                    start_angle=0,
                    stop_angle=math.pi,
                    width=self.line_thickness,
                )

            else:

                pygame.draw.arc(
                    surface=surface,
                    color=self.color,
                    rect=rect,
                    start_angle=math.pi,
                    stop_angle=2 * math.pi,
                    width=self.line_thickness,
                )

            zero_degrees_vector = [0, 1]

            # we have to invert the y-coordinate because the y-axis of the Cartesian coordinate system is inverted to the y-axis of pygame
            edge_vector = [
                p2[0] - p1[0],
                -1 * (p2[1] - p1[1]),
            ]

            degrees = get_angle_between_vectors(v1=zero_degrees_vector, v2=edge_vector)

            surface = pygame.transform.rotate(surface=surface, angle=450 - degrees)

            screen.blit(
                surface,
                (
                    centerx - 0.5 * surface.get_width(),
                    centery - 0.5 * surface.get_height(),
                ),
            )

    def calc_points(self) -> list[tuple[int, int]]:

        points = []
        angle = 360 / self.vertices

        for i in range(self.vertices):

            x = self.center[0] + self.radius * math.sin(i * math.radians(angle))
            y = self.center[1] - self.radius * math.cos(i * math.radians(angle))

            points.append((x, y))

        return points

    def move(self) -> None:

        self.center[0] = self.center[0] + self.speed * self.direction[0]
        self.center[1] = self.center[1] + self.speed * self.direction[1]

        self.points = self.calc_points()

    def set_direction(self, direction: list[float]) -> None:

        if direction != [0, 0]:

            self.direction = list(np.array(direction) / np.linalg.norm(direction))

        else:

            self.direction = [0, 0]