Pyglet中的相机行为

Question

我想从您那里知道如何确保pyglet（2D）中的摄像头始终跟随播放器，并将其始终保持在屏幕中间。另外，我想知道如何使用鼠标滚轮将播放器始终保持在屏幕中间来进行线性缩放。明确地说，如果有人知道Factorio，我希望相机的行为相同。在周围，我仅找到有关如何通过移动鼠标等操作的示例。不幸的是，我还没有找到我感兴趣的东西。

这是我当前正在使用的脚本：

主类（我不报告所有脚本，但报告与相机有关的部分）：

def on_resize(self, width, height):
    self.camera.init_gl(width, height)

def on_mouse_scroll(self, x, y, dx, dy):
    self.camera.scroll(dy)

def _world(self):
    self.camera = camera(self)
    self.player = player(self, 0, 0)
    self.push_handlers(self.player.keyboard)

相机脚本：

class camera(object):
    zoom_in_factor = 1.2
    zoom_out_factor = 1 / zoom_in_factor

    def __init__(self, game):
        self.game = game
        self.left = 0
        self.right = self.game.width
        self.bottom = 0
        self.top = self.game.height
        self.zoom_level = 1
        self.zoomed_width = self.game.width
        self.zoomed_height = self.game.height

    def init_gl(self, width, height):
        self.width = width
        self.height = height
        glViewport(0, 0, self.width, self.height)

    def draw(self):
        glPushMatrix()
        glOrtho(self.left, self.right, self.bottom, self.top, 1, -1)
        glTranslatef(-self.game.player.sprite.x + self.width / 2, -self.game.player.sprite.y + self.height / 2, 0)
        self.game.clear()
        if self.game.runGame:
            for sprite in self.game.mapDraw_3:
                self.game.mapDraw_3[sprite].draw()
        glPopMatrix()
        print(self.game.player.sprite.x, self.game.player.sprite.y)

    def scroll(self, dy):
        f = self.zoom_in_factor if dy > 0 else self.zoom_out_factor if dy < 0 else 1
        if .1 < self.zoom_level * f < 2:
            self.zoom_level *= f

            vx = self.game.player.sprite.x / self.width
            vy = self.game.player.sprite.y / self.height

            vx_in_world = self.left + vx * self.zoomed_width
            vy_in_world = self.bottom + vy * self.zoomed_height

            self.zoomed_width *= f
            self.zoomed_height *= f

            self.left = vx_in_world - vx * self.zoomed_width
            self.right = vx_in_world + (1 - vx) * self.zoomed_width
            self.bottom = vy_in_world - vy * self.zoomed_height
            self.top = vy_in_world + (1 - vy) * self.zoomed_height

这是我得到的：