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Flash表單制作實例:三角函數值計算

  第4節 三角函數值計算

  在Flash 中,算術計算函數十分有限,很多函數計算都必須手寫很多代碼得以進行,這對一些不太懂編程的朋友來說是一件很痛苦的事情,此實例提供了一些常用的三角函數例如正弦和余弦的計算,表單最終效果如圖4.1所示:

Flash表單制作實例:三角函數值計算 三聯

 

  圖4.1 最終效果

  1.首先啟動Flash,新建一個影片,設置影片舞台大小為250px*200px(單位為象素),影片背景色為白色.

  2.選擇工具箱中的文本工具,在舞台上的適當位置輸入提示文本"在此輸入角度:",然後還是使用文本工具在右邊繪制一個文本框,此文本框用來輸入一個角度值,此角度值可以被轉化為相應的弧度值,然後在屬性面板中設置其為輸入文本,文本框變量名為angle,其它相關設置如圖4.2所示:

 

  圖4.2 設置文本框屬性

  此時舞台如圖4.3所示:

 

  圖4.3 繪制輸入文本框

  3.按照相同的方法在舞台的下方輸入提示文字:"在此輸入角度",還是使用文本工具在右邊繪制一個文本框,此文本框用來輸出和輸入文本框中角度值相對應的弧度值.然後在屬性面板中設置其為動態文本框,設置文本變量為output,其它相關設置如圖4.4所示;

 

  圖4.4 設置動態文本框屬性

  此時舞台如圖4.5所示;

 

  圖4.5 繪制動態文本框

  4.下面制作用來控制角度轉換的部分,我們在一個影片剪輯裡實現這樣的功能.新建一個影片剪輯元件,命名為trig,進入元件的編輯區後,添加3個圖層,自上向下分別命名為stop, set values和Action.

  選中圖層stop,在第1幀添加Action: stop();

  5.選擇圖層set values,在第1幀添加如下Action:

  sin0 = 0;

  sin1 = .0175;

  sin2 = .0349;

  sin3 = .0523;

  sin4 = .0698;

  sin5 = .0872;

  sin6 = .1045;

  sin7 = .1219;

  sin8 = .1392;

  sin9 = .1564;

  sin10 = .1736;

  sin11 = .1908;

  sin12 = .2079;

  sin13 = .2250;

  sin14 = .2419;

  sin15 = .2588;

  sin16 = .2756;

  sin17 = .2924;

  sin18 = .3090;

  sin19 = .3256;

  sin20 = .3420;

  sin21 = .3584;

  sin22 = .3746;

  sin23 = .3907;

  sin24 = .4067;

  sin25 = .4226;

  sin26 = .4384;

  sin27 = .4540;

  sin28 = .4695;

  sin29 = .4848;

  sin30 = .5;

  sin31 = .5150;

  sin32 = .5299;

  sin33 = .5446;

  sin34 = .5592;

  sin35 = .5736;

  sin36 = .5878;

  sin37 = .6018;

  sin38 = .6157;

  sin39 = .6293;

  sin40 = .6428;

  sin41 = .6561;

  sin42 = .6691;

  sin43 = .6820;

  sin44 = .6947;

  sin45 = .7071;

  sin46 = .7193;

  sin47 = .7314;

  sin48 = .7431;

  sin49 = .7547;

  sin50 = .7660;

  sin51 = .7771;

  sin52 = .7880;

  sin53 = .7986;

  sin54 = .8090;

  sin55 = .8192;

  sin56 = .8290;

  sin57 = .8387;

  sin58 = .8480;

  sin59 = .8572;

  sin60 = .8660;

  sin61 = .8746;

  sin62 = .8829;

  sin63 = .8910;

  sin64 = .8988;

  sin65 = .9063;

  sin66 = .9135;

  sin67 = .9205;

  sin68 = .9272;

  sin69 = .9336;

  sin70 = .9397;

  sin71 = .9455;

  sin72 = .9511;

  sin73 = .9563;

  sin74 = .9613;

  sin75 = .9659;

  sin76 = .9703;

  sin77 = .9744;

  sin78 = .9781;

  sin79 = .9816;

  sin80 = .9848;

  sin81 = .9877;

  sin82 = .9903;

  sin83 = .9925;

  sin84 = .9945;

  sin85 = .9962;

  sin86 = .9976;

  sin87 = .9986;

  sin88 = .9994;

  sin89 = .9998;

  sin90 = 1;

  count = 91;

  while (Number(count)<=180) {

  set("sin" add count, eval ("sin" add (180 - count)));

  count = Number(count)+1;

  }

  count = 181;

  while (Number(count)<=270) {

  set("sin" add count, eval ("sin" add (count - 180)) * -1);

  count = Number(count)+1;

  }

  count = 271;

  while (Number(count)<=360) {

  set("sin" add count, eval ("sin" add (360 - count)) * -1);

  count = Number(count)+1;

  }

  count = 0;

  while (Number(count)<=90) {

  set("cos" add count, eval ("sin" add (90 - count)));

  count = Number(count)+1;

  }

  count = 91;

  while (Number(count)<=180) {

  set("cos" add count, eval ("cos" add (180 - count)) * -1);

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