123 lines
3.4 KiB
Python
123 lines
3.4 KiB
Python
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# -------------------------------
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# Difficult Rocket
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# Copyright © 2020-2023 by shenjackyuanjie 3695888@qq.com
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# All rights reserved
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# -------------------------------
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# Huge thanks to pyglet developers
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from typing import Tuple, Optional
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class Camera:
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"""
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>>> from pyglet.window import Window
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>>> window = Window()
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>>> camera = Camera(window)
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>>> @window.event
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>>> def on_draw():
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>>> camera.begin()
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>>> window.clear()
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>>> camera.end()
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"""
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def __init__(self,
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window,
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zoom: Optional[float] = 1.0,
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dx: Optional[float] = 1.0,
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dy: Optional[float] = 1.0,
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min_zoom: Optional[float] = 1.0,
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max_zoom: Optional[float] = 1.0) -> None:
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self.window = window
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self.dx = dx
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self.dy = dy
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self.zoom = zoom
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self.min_zoom = min_zoom
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self.max_zoom = max_zoom
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def get_view(self):
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return self.window.view
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@property
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def position(self) -> Tuple[float, float]:
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return self.dx, self.dy
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@position.setter
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def position(self, value: Tuple[float, float]):
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self.dx, self.dy = value
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@property
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def zoom_level(self) -> float:
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return self.zoom
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@zoom_level.setter
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def zoom_level(self, value: float) -> None:
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self.zoom = min(max(value, self.min_zoom), self.max_zoom)
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def begin(self) -> None:
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view = self.window.view
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x = self.window.width / self.zoom + (self.dx / self.zoom)
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y = self.window.height / self.zoom + (self.dy / self.zoom)
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view_matrix = view.translate((x * self.zoom, y * self.zoom, 0))
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view_matrix = view_matrix.scale((self.zoom, self.zoom, 1))
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self.window.view = view_matrix
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def end(self) -> None:
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view = self.window.view
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x = self.window.width / self.zoom + (self.dx / self.zoom)
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y = self.window.height / self.zoom + (self.dy / self.zoom)
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view_matrix = view.scale((1.0 / self.zoom, 1.0 / self.zoom, 1))
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view_matrix = view_matrix.translate((-x * self.zoom, -y * self.zoom, 0))
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self.window.view = view_matrix
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def __enter__(self):
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self.begin()
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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self.end()
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class CenterCamera(Camera):
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"""
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A camera that centers the view on the center of the window
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>>> from pyglet.window import Window
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>>> window = Window()
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>>> camera = CenterCamera(window)
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>>> @window.event
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>>> def on_draw():
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>>> camera.begin()
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>>> window.clear()
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>>> camera.end()
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"""
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def begin(self) -> None:
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view = self.window.view
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x = self.window.width / 2.0 / self.zoom + (self.dx / self.zoom)
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y = self.window.height / 2.0 / self.zoom + (self.dy / self.zoom)
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view_matrix = view.translate((x * self.zoom, y * self.zoom, 0))
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view_matrix = view_matrix.scale((self.zoom, self.zoom, 1))
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self.window.view = view_matrix
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def end(self) -> None:
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view = self.window.view
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x = self.window.width / 2.0 / self.zoom + (self.dx / self.zoom)
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y = self.window.height / 2.0 / self.zoom + (self.dy / self.zoom)
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view_matrix = view.scale((1.0 / self.zoom, 1.0 / self.zoom, 1))
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view_matrix = view_matrix.translate((-x * self.zoom, -y * self.zoom, 0))
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self.window.view = view_matrix
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