利用TweenMax針對HTML頁面製作動畫 – 基礎篇
馬老師在前一篇文章介紹過GreenSock的Tweening Platform在Flash中的應用後,接下來要跟各位分享「GreenSock Animation Platform」(GSAP),那麼多英文聽起來好像很複雜,就讓我為各位簡單介紹一下吧!
首先GreenSock一開始真的是針對Flash的Tween(補間)寫了許多好用的Class供設計師們使用,在不斷的更新和強化之後,目前已經出到v11(第十一版)了,但只要熟悉網路平台的朋友應該都知道,近幾年Flash在網頁上的應用,除了遊戲之外正在減少中,所以在GreenSock的v12(第十二版)中,加入了JavaScript的Class,也就是說我們可以在HTML網頁中使用TweenLite或TweenMax…等來製作動畫,也藉此版本把發展計劃的名稱從「GreenSock Tweening Platform」(GreenSock補間平台)更名為「GreenSock Animation Platform」(GreenSock動畫平台),主要是把「Tweening」換成「Animation 」,因為前者主要為Flash在使用的名詞,而後者就屬於比較廣義的「動畫」,所以未來就算你還在使用Flash的TweenMax,他也是屬於「GreenSock Animation Platform」中的一員了。
在網頁上GreenSock目前提供使用的有「TweenLite」、「TweenMax」、「TimelineLite」、「TimelineMax」這四個項目,雖比Flash來的少,不過也是最常用的幾項,相信可以幫助設計師們在不使用Flash的情形之下,製作許多不同凡響的動畫效果,另外關於這四項的差別也跟Flash版本一樣,之前有介紹過在這邊就不多提了,接下來就看一下簡單的使用方式吧。
首先跟Flash版本一樣,必須先下載(備用載點)JS的Class,下載解壓縮後,會有以下的資料夾:
- docs:參考文件。
- examples:裡面有很多html的展示,對於想要了解本Class非常有幫助。
- src:主要Class資料夾。
在網頁上主要使用的資料夾為src,而若是網頁要使用這個Class,跟Flash需要先import,不過HTML的指令如下:
<script src="src/minified/TweenMax.min.js"></script>
接下來就開始針對HTML和Javascript進行編輯,先看看我製作的第一個範例,下面是本範例整個網頁的程式碼:
<!doctype html> <html> <head> <meta charset="utf-8"> <title>GreenSock HTML Tweening Basic</title> <script src="src/minified/TweenMax.min.js"></script> <script language="javascript"> function scaleSmall() { var photo = document.getElementById("cat"); TweenMax.to(photo, 2, { width: 300, height: 200 }); } </script> </head> <body style="font-size:13px; background-color:#FFF"> <p style="text-align:center"><img src="cat.jpg" alt="波妞 大頭照" name="cat" width="600" height="400" id="cat" onClick="scaleSmall()"></p> <p style="text-align:center">請點擊貓咪照片</p> </body> </html>
基本上就是點擊後圖片縮小的效果,第10行即為TweenMax製作動畫的程式,當然利用TweenMax製作動畫,其中動畫類型也是重要的參數,第二個案例就加上了動畫類型,大家可以參考動畫變化的形式,下面是本範例整個網頁的程式碼:
<!doctype html> <html> <head> <meta charset="utf-8"> <title>GreenSock HTMLTweening ease</title> <script src="src/minified/TweenMax.min.js"></script> <script language="javascript"> function scaleSmall() { var photo = document.getElementById("cat"); TweenMax.to(photo, 2, { width: 300, height: 200, ease: Elastic.easeOut }); } </script> </head> <body style="font-size:13px; background-color:#FFF"> <p style="text-align:center"><img src="cat.jpg" alt="波妞 大頭照" name="cat" width="600" height="400" id="cat" onClick="scaleSmall()"></p> <p style="text-align:center">請點擊貓咪照片</p> </body> </html>
除此之外,動畫變化的大小,當然也可以利用比例來計算,第三個範例就是用圖片寬度和高度比例來進行動畫縮小,各位也可以參考,下面是本範例整個網頁的程式碼:
<!doctype html> <html> <head> <meta charset="utf-8"> <title>GreenSock HTMLTweening ease</title> <script src="src/minified/TweenMax.min.js"></script> <script language="javascript"> function scaleSmall() { var photo = document.getElementById("cat"); TweenMax.to(photo, 2, { width: photo.width * 0.8, height: photo.height * 0.8, ease: Elastic.easeOut }); } </script> </head> <body style="font-size:13px; background-color:#FFF"> <p style="text-align:center"><img src="cat.jpg" alt="波妞 大頭照" name="cat" width="600" height="400" id="cat" onClick="scaleSmall()"></p> <p style="text-align:center">請連續點擊貓咪照片</p> </body> </html>
當然在原先TweenMax可以使用的參數「onStart」、「onUpdate」、「onComplete」也一樣可以使用,第四個範例就加上了這部分的程式碼,下面是本範例整個網頁的程式碼:
<!doctype html> <html> <head> <meta charset="utf-8"> <title>GreenSock HTMLTweening onCompleteSock HTMLTweening onComplete</title> <script src="src/minified/TweenMax.min.js"></script> <script language="javascript"> function scaleSmall() { var photo = document.getElementById("cat"); TweenMax.to(photo, 2, { width: 300, height: 200, ease: Elastic.easeOut, onComplete: okFn }); } function okFn() { alert("動畫執行完畢"); } </script> </head> <body style="font-size:13px; background-color:#FFF"> <p style="text-align:center"><img src="cat.jpg" alt="波妞 大頭照" name="cat" width="600" height="400" id="cat" onClick="scaleSmall()"></p> <p style="text-align:center">請點擊貓咪照片</p> </body> </html>
看完了以上的範例,大家對於TweenMax在網頁中的使用應該有基本的認識,當然接下來就要看你的創意和HTML、Javascript、CSS的操作能力了,在這邊也製作一個較完整的範例供大家參考,下面是本範例整個網頁的程式碼:
<!doctype html> <html> <head> <meta charset="utf-8"> <title>GreenSock HTMLTweening Sample 1</title> <style type="text/css"> #yahoo { height: 240px; width: 560px; margin-right: auto; margin-left: auto; overflow: hidden; } /* yahoo Div 樣式(最外層) */ #yahoo #pic { height: 210px; width: 2240px; overflow: hidden; left: 0px; position: relative; } /* 放置圖片Div樣式 */ #yahoo #btn { text-align: right; float: left; height: 30px; width: 560px; } /* 下方文字連結Div */ #yahoo #btn a { margin-left: 5px; padding-top: 2px; padding-right: 4px; padding-bottom: 2px; padding-left: 4px; } /* 下方文字連結樣式 */ </style> <script src="src/minified/TweenMax.min.js"></script> <script language="javascript"> function moveFn(no) { var banner = document.getElementById("pic"); TweenMax.to(banner, 1, { css: { left: (no - 1) * -560 }, ease: Quad.easeInOut }); } </script> </head> <body style="font-size:13px; background-color:#FFF"> <div id="yahoo"> <div id="pic"><img src="yahoo/y1.jpg" id="p1" width="560" height="210"><img src="yahoo/y2.jpg" width="560" height="210"><img src="yahoo/y3.jpg" width="560" height="210"><img src="yahoo/y4.jpg" width="560" height="210"></div> <div id="btn"><a href="javascript:;" onClick="moveFn(1)">1</a><a href="javascript:;" onClick="moveFn(2)">2</a><a href="javascript:;" onClick="moveFn(3)">3</a><a href="javascript:;" onClick="moveFn(4)">4</a></div> </div> </body> </html>
在網頁上有TweenMax協助我們製作動畫,我們更可以把心思放在排版、樣式和內容上面,省去了撰寫計算動畫程式的時間,希望大家可以利用它做出很棒的作品!最後附上本範例的原始檔給大家參考。
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