Quadtrees aren't limited to point data. They can also partition regions of continuous data, like the pixels of an image.
可这份纯粹的快乐并未持续太久，日复一日的消遣渐渐变得乏味，人生仿佛突然失去了目标。
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In 1992, in a small shop in British Columbia, a sign maker named Blair Gran stared at a wall full of half-finished jobs and felt something click. Sign-making was treated like a commodity — orders in, banners out — but as thousands of signs came through his shop, he couldn’t help but notice the difference between the good ones and the bad ones. He could see that every sign that left his shop was either helping a business get noticed, or letting it disappear in plain sight.
Feel free to tell what you plan on doing this weekend and even ask for help or feedback.