def _clamp_camera(self):
left = self.ws_crop_w // 2
right = self.world_w - int(math.ceil(self.ws_crop_w / 2.0))
self.ws_camera_x = Utils.clamp(self.ws_camera_x, left, right)
top = self.ws_crop_h // 2
bottom = self.world_h - int(math.ceil(self.ws_crop_h / 2.0))
self.ws_camera_y = Utils.clamp(self.ws_camera_y, top, bottom)
def set_zoom(self, zoom):
old_zoom = self.zoom
self.zoom = Utils.clamp(zoom, self.min_zoom, self.max_zoom)
# manually derive world and camera, since old camera position should only be scaled during zoom
delta_zoom = 1.0 * self.zoom / old_zoom
self.world_w = self.mask_w * self.zoom
self.world_h = self.mask_h * self.zoom
self.ws_camera_x = int(math.floor(self.ws_camera_x * delta_zoom))
self.ws_camera_y = int(math.floor(self.ws_camera_y * delta_zoom))
self._clamp_camera()
self._derive_space_vars()
def set_mouse_zoom(self, zoom, e):
x, y = self.mouse_canvas_to_world(e)
# move camera position with no clamping and no deriving space vars
dx = x - self.ws_camera_x
dy = y - self.ws_camera_y
self.ws_camera_x += dx
self.ws_camera_y += dy
# zoom with no clamping and no deriving space vars
old_zoom = self.zoom
self.zoom = Utils.clamp(zoom, self.min_zoom, self.max_zoom)
# manually derive world and camera, since old camera position should only be scaled during zoom
delta_zoom = 1.0 * self.zoom / old_zoom
self.world_w = self.mask_w * self.zoom
self.world_h = self.mask_h * self.zoom
self.ws_camera_x = int(math.floor(self.ws_camera_x * delta_zoom))
self.ws_camera_y = int(math.floor(self.ws_camera_y * delta_zoom))
# move the world so the new camera moves to the mouse
# clamp and derive space vars
self.move_camera_position(-dx, -dy)
