"""

raylib [shapes] example - Following Eyes

"""

from pyray import *

from math import (
    atan2,
    cos,
    sin
)

# Initialization
# ----------------------------------------------------------------------------------
screenWidth = 800
screenHeight = 450

init_window(screenWidth, screenHeight, "raylib [shapes] example - following eyes")

scleraLeftPosition = Vector2(screenWidth / 2.0 - 100.0, screenHeight / 2.0)
scleraRightPosition = Vector2(screenWidth / 2.0 + 100.0, screenHeight / 2.0)
scleraRadius = 80.0

irisLeftPosition = Vector2(screenWidth / 2.0 - 100.0, screenHeight / 2.0)
irisRightPosition = Vector2(screenWidth / 2.0 - 100.0, screenHeight / 2.0)
irisRadius = 24.0

angle = 0.0
dx, dy, dxx, dyy = 0.0, 0.0, 0.0, 0.0

set_target_fps(60)
# ----------------------------------------------------------------------------------

# Main game loop
while not window_should_close():  # Detect window close button or ESC key
    # Update
    # ----------------------------------------------------------------------------------
    irisLeftPosition = get_mouse_position()
    irisRightPosition = get_mouse_position()

    # Check not inside the left eye sclera
    if not check_collision_point_circle(irisLeftPosition, scleraLeftPosition, scleraRadius - 20):
        dx = irisLeftPosition.x - scleraLeftPosition.x
        dy = irisLeftPosition.y - scleraLeftPosition.y

        angle = atan2(dy, dx)

        dxx = (scleraRadius - irisRadius)*cos(angle)
        dyy = (scleraRadius - irisRadius)*sin(angle)

        irisLeftPosition.x = scleraLeftPosition.x + dxx
        irisLeftPosition.y = scleraLeftPosition.y + dyy

    # Check not inside the right eye sclera
    if not check_collision_point_circle(irisRightPosition, scleraRightPosition, scleraRadius - 20):
        dx = irisRightPosition.x - scleraRightPosition.x
        dy = irisRightPosition.y - scleraRightPosition.y

        angle = atan2(dy, dx)

        dxx = (scleraRadius - irisRadius)*cos(angle)
        dyy = (scleraRadius - irisRadius)*sin(angle)

        irisRightPosition.x = scleraRightPosition.x + dxx
        irisRightPosition.y = scleraRightPosition.y + dyy

    # ----------------------------------------------------------------------------------

    # draw
    # ----------------------------------------------------------------------------------
    begin_drawing()

    clear_background(RAYWHITE)

    draw_circle_v(scleraLeftPosition, scleraRadius, LIGHTGRAY)
    draw_circle_v(irisLeftPosition, irisRadius, BROWN)
    draw_circle_v(irisLeftPosition, 10, BLACK)

    draw_circle_v(scleraRightPosition, scleraRadius, LIGHTGRAY)
    draw_circle_v(irisRightPosition, irisRadius, DARKGREEN)
    draw_circle_v(irisRightPosition, 10, BLACK)

    draw_fps(10, 10)

    end_drawing()

# De-Initialization
close_window()  # Close window and OpenGL context