# Import Python modules
if __name__ == '__main__':
import glm
import pygame as pg
FOV = 50 # Value in degrees
NEAR = 0.1
FAR = 100
SPEED = 0.01
SENSITIVITY = 0.05
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class Camera:
def __init__(self, app, position=(0, 0, 4), yaw=-90, pitch=0):
self.app = app
self.aspect_ratio = app.WIN_SIZE[0] / app.WIN_SIZE[1]
# Setup camera/eye position and up-vector
self.position = glm.vec3(position)
self.up = glm.vec3(0, 1, 0)
# Setup orthonormal basis vectors
self.up = glm.vec3(0, 1, 0)
self.right = glm.vec3(1, 0, 0)
self.forward = glm.vec3(0, 0, -1)
# Setup orientations
self.yaw = yaw
self.pitch = pitch
# View matrix
self.m_view = self.get_view_matrix()
# Projection matrix
self.m_proj = self.get_projection_matrix()
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def rotate(self):
rel_x, rel_y = pg.mouse.get_rel()
self.yaw += rel_x * SENSITIVITY
self.pitch -= rel_y * SENSITIVITY
self.pitch = max(-89, min(89, self.pitch))
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def update_camera_vectors(self):
"""
We emulate a first-person camera by rotating around the Z-axis and X-axis
"""
yaw = glm.radians(self.yaw)
pitch = glm.radians(self.pitch)
self.forward.x = glm.cos(yaw) * glm.cos(pitch)
self.forward.y = glm.sin(pitch)
self.forward.z = glm.sin(yaw) * glm.cos(pitch)
self.forward = glm.normalize(self.forward)
self.right = glm.normalize(glm.cross(self.forward, glm.vec3(0, 1, 0)))
self.up = glm.normalize(glm.cross(self.right, self.forward))
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def update(self):
self.move()
self.rotate()
self.update_camera_vectors()
# Re-calculate the view matrix
self.m_view = self.get_view_matrix()
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def move(self):
velocity = SPEED * self.app.delta_time
keys = pg.key.get_pressed()
if keys[pg.K_w]:
self.position += self.forward * velocity
if keys[pg.K_s]:
self.position -= self.forward * velocity
if keys[pg.K_a]:
self.position -= self.right * velocity
if keys[pg.K_d]:
self.position += self.right * velocity
if keys[pg.K_q]:
self.position += self.up * velocity
if keys[pg.K_e]:
self.position -= self.up * velocity
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def get_view_matrix(self):
return glm.lookAt(self.position, self.position + self.forward, self.up)
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def get_projection_matrix(self):
return glm.perspective(glm.radians(FOV), self.aspect_ratio, NEAR, FAR)