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～
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