首頁其他教你用Desmos數學軟體畫動漫角色！
其他

教你用Desmos數學軟體畫動漫角色！

XiaoJain
By XiaoJain
最後更新時間：
1425
19822

前言：Desmos軟體簡介

首先，Desmos是個能畫出方程式的數學軟體，舉凡常聽見的y=2x+3、y＝0.5x2 ＋2x－7……到三角函數y2 ＝sin 2／x3 都可以畫成圖形，是一個相當強大的數學軟體。

當然我不是想跟你講這些，既然它可以把方程式畫成圖形，那麼你有沒有想過可以把方程式集合在一起畫成一張圖？

先別急著下載Desmos，程式版的沒有辦法把圖片丟上去，我建議你如果沒有使用過，先從網頁版開始嘗試(手機或電腦皆可)，也比較容易做畫。

實作繪製動漫

剛進去網頁時，工具欄旁有一個加號(圖一)，點開來裡面有一個圖片，把你想要畫的圖案加進來當作底圖，把圖片的透明度先調低。

再來建議你先創一個資料夾，把要畫的同一個組塊放在一起(像是同個顏色、人物或是單純的一個人物)，就可以開始描邊了。如果要畫很多條相似的線條，可以按齒輪，再按複製(圖二的紙張)。

圖一

  • 圖二

如何開始第一步？你可以從看起來有大量直線的邊邊區域開始畫，像是這張圖，你可以從頭髮先開始畫，但是一張圖還是難免有曲線部分，你可以試著去想像這條曲線的最末端在哪(下圖紅線為想像曲線，灰點是最末端，以上以下都往左靠)。

以上的曲線可以用你學過的二次拋物線 y-k=a(x-h）2 (開口朝上朝下)或者是 x-h=a(y-k)2 (開口朝右朝左)其中(h,k)是最末端座標，而a值大小代表開口大小(正負決定左邊等式朝正或負發展，純數字越大開口越小、越小則相反)。

最後再加上{}符號來限制範圍，比如說你只想取這條線x介在2～2.2的部分，那就列不等式{2≤x≤2.2}(y也可以這樣取，也可以分別立x跟y)。

接下來是我的作品分享(我畫的是「獵人」裡的「小傑」):

裡面共有403條方程式，裡面共有370多條只利用一次函數和拋物線畫成，這證明我們光是國中學的數學就可以畫出大部分的圖了，剩下來的是一些是我用圓方程式(x-h)2 +(y-k)2 =r半徑，還有(斜)橢圓形方程式(橢圓形只是將x2 項前面再加上可變換的係數a(斜橢圓再加上b•xy，b可變))，只有5條以下的方程式是用三次函數和高次方程式(係數轉換比較不規則和麻煩)，但這些也可以用多條拋物線畫出來。

總結：記住！別怕麻煩！只要一天畫20條左右的線，有空時可以多畫點，堅持到最後你就可以畫出你想畫出的動漫！(小備註:左邊顏色區塊只要長按就可以將線條進行換顏色、調深淡(0.7的部分)、改變線條粗細(2.5的部分)和種類等微調)。

這是我這次作圖的心得分享，謝謝大家！(因為個人因素不方便放作品連結，敬請見諒)

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