利用Box2D+WCK賦予Flash物理特性 萬有引力
這已經是第五篇Box2D+WCK的介紹文章了，前面幾篇文章如果各位有注意應該會發現，所有範例的萬有引力都跟現在我們生活的環境一樣，物件像是被地心引力給吸引著都會往下方掉落，其實我們在使用這個模組的時候，也可以改變這樣的萬有引力，讓這些物件不要往下掉落而是往我們所指定的方向移動，馬老師在這邊大概製作了三種不同類型的萬有引力範例，分述如下：
1.容器型萬有引力：這個萬有引力是利用一個封閉的空間來繪製的。
大概的製作步驟如下：
我們可以在World元件中繪製一個如下圖的形狀：
接下來將他轉換成一個影片片段，在類別的部分輸入gravity.GravityCapsule的名稱，如下圖所示：
接下來把這個元件拖曳到World元件裡面就可以了。
2.放射狀萬有引力：這種萬有引力是以往內或往外放射狀的方式存在。
我們可以在World元件中繪製一個如下圖的形狀：
接下來將他轉換成一個影片片段，在類別的部分輸入gravity.GravityRadial的名稱，如下圖所示：
接下來把這個元件拖曳到World元件裡面就可以了。
3.正弦萬有引力：就是三角函數的sin。
我們可以在World元件中繪製一個如下圖的形狀：
接下來將他轉換成一個影片片段，在類別的部分輸入gravity.GravitySine的名稱，如下圖所示：
接下來把這個元件拖曳到World元件裡面就可以了。
同樣的也讓大家可以下載以上的三個範例檔，範例檔為CS5格式，下載後要重新設定來源路徑和元件庫路徑喔！希望這個範例對大家有所幫助，如果還有疑問，也可以在這邊回應唷～
The fish collectors hoping to save rare species from extinction
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In the rural town of Petersham, Massachusetts, 78-year-old Peter George keeps 1,000 fish in his basement.
“Baseball, sex, fish,” he says, listing his life’s great loves. “My single greatest attribute is that I am passionate about things. That sort of defines me.”
All of George’s fish are endangered Rift Lake cichlids: colorful, freshwater fish native to the Great Lakes of East Africa. Inside his 42 tanks, expertly squeezed into a single subterranean room, the fish shimmer under artificial lights, knowing nothing of the expansive waters in which their ancestors once swam, thousands of miles away.
Due to pollution, climate change and overfishing, freshwater fish are thought to be the second most endangered vertebrates in the world. In Lake Victoria, a giant lake shared between Kenya, Uganda and Tanzania, over a quarter of endemic species, including countless cichlids, are either critically endangered or extinct.
But for some species, there is still hope. A community of rare fish enthusiasts collect endangered species of freshwater fish from the lakes and springs of East Africa, Mexico and elsewhere, and preserve them in their personal fish tanks in the hope that they might one day be reintroduced in the wild.
“I’m a hard ass,” George says. “There is hope.”
Insurance
George has been collecting fish since 1948 when, as a four-year-old in the Bronx, he would look after his grandmother’s rainbow fish. He soon developed “multiple tank syndrome” – a colloquial term used by fish collectors to denote the spiral commonly experienced after acquiring one’s first tank, which involves the sufferer buying many more tanks within a short space of time. He has not stopped collecting since.
Now, George sees himself as a conservationist; his tanks contain what is known as “insurance populations” – populations of endangered fish that are likely to go extinct in their natural habitats. He believes that when the time is right, they can be taken from his collection and returned to their homes. “I would never accept the fact that they couldn’t be reintroduced,” he says.
The crypto industry is advancing. (Just don’t ask it where it’s going.)
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After a dramatic start to the year, the crypto industry is settling into a new reality — one in which the White House is laying out the red carpet and promising an unprecedented level of support.
Crypto, a roughly 15-year-old industry that’s largely operated on the fringes of finance, is at a crossroads. For years, it has blamed a hostile regulatory environment for not allowing it to unleash its supposedly revolutionary technology on Americans. Now, though, their favorite bogeyman, Gary Gensler, the Securities and Exchange Commission chief under President Joe Biden, is gone. Crypto cheerleaders have been installed throughout the government.
The SEC has dropped several enforcement cases against crypto companies and, starting Friday, is hosting a series of public roundtables “to discuss key areas of interest in the regulation of crypto assets.”
Under President Donald Trump, there’s virtually nothing stopping crypto companies from creating and selling their products.
At the same time, the same White House’s chaotic trade policy is undermining financial markets’ appetite for risk, leaving bitcoin in limbo, more than 20% off from its record high in January. And while the industry is grateful for all the attention, the White House’s embrace of some of crypto’s less savory aspects, like meme coins, has given serious investors pause.
Given the enormous potential for the $3 trillion industry in this moment, I checked in with Eswar Prasad, a Cornell University professor of international trade and the author of the 2021 book “The Future of Money,” about the forces disrupting financial technologies.
Fundamentally, Prasad brings a pragmatist’s view of crypto that is as refreshing as it is rare in a subject area that tends to attract zealots and loudmouths. We spoke over the phone shortly after the first-of-its-kind White House crypto summit earlier this month.
The following interview has been edited for length and clarity.
Nightcap: We just saw a pretty wild thing happen with the crypto summit — hard to imagine a scenario like that taking place under any previous administration. What were your takeaways?
Eswar Prasad: The crypto industry is kissing the ring, and I think it’s getting exactly what it wants from the Trump administration, which is the legitimacy provided by government oversight, coupled with what is almost certain to be quite light touch and non-inclusive regulation.
And I think we saw many of the major players in the crypto industry essentially using the opportunity to not just thank Trump, but try to make the point, which seemed to resonate with Trump, that this industry can power, in some sense, a resurgence of a certain part of the US economy.
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