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A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.
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而对于写作来说，我会在初期利用它头脑风暴帮我想一些写作角度，再根据我想写的核心，自己归纳好大纲，然后开始写作。
After taking it out of the box and plugging it in, you'll have to connect to your home Wi-Fi. Then, the Dreamie presents you with a tutorial to walk you through navigating its menus and physical controls. There's a touch strip on the top of the device to turn on the lamp and adjust its brightness, as well as the brightness of any ambient color "scene" that's active. By dragging the dot at the center of the lamp screen, you can throw the light in any particular direction. Volume is adjusted by turning the dial that's around the clockface. To access the menu for alarms and other settings, swipe up. To cycle through the different content modes — ambient, wind down and noise mask — just swipe down from the top of the screen. Easy peasy.