htm5 시차 애니메이션 구현

44122 단어 애니메이션
requestAnimationFrame.js   
1 window.requestAnimFrame = (function() {

2                 return window.requestAnimationFrame ||

3                     window.webkitRequestAnimationFrame ||

4                     window.mozRequestAnimationFrame ||

5                     window.oRequestAnimationFrame ||

6                     window.msRequestAnimationFrame || function( /* function */ callback, /* DOMElement */ element) {

7                     window.setTimeout(callback, 1000 / 60);

8                 };

9             })();

페이지 기본 코드:
  1 <!DOCTYPE HTML>

  2 <html>

  3     

  4     <head>

  5         <meta http-equiv="Content-Type" content="text/html; charset=utf-8">

  6         <title> </title>

  7         <script type="text/javascript" src="js/jquery8.js"></script>

  8         <script type="text/javascript" src="js/requestAnimationFrame.js"></script>

  9         <style type="text/css">

 10             body {

 11                 background:#dddddd;

 12             }

 13             #control {

 14                 width:1000px;

 15                 margin:0 auto;

 16             }

 17             #containter {

 18                 text-align:center;

 19             }

 20             

 21             #canavas {

 22                 margin:10px;

 23                 padding:10px;

 24                 background:#ffffff;

 25                 border:thin #aaaaaa;

 26             }

 27         </style>

 28         <script type="text/javascript">

 29 

 30             $(function() {

 31 

 32                 canvas = jQuery("#canavas")[0];

 33                 content = canvas.getContext("2d");

 34                 

 35                 // 

 36                 sky = new Image();

 37                 sky.src = "image/back.jpg";

 38 

 39                 // 

 40                 c1 = new Image();

 41                 c1.src = "image/cloud2.png";

 42 

 43                 c2 = new Image();

 44                 c2.src = "image/cloud1.jpg";

 45 

 46                 c3 = new Image();

 47                 c3.src = "image/cloud3.jpg";

 48                 

 49                 lastTime = (+new Date())

 50                 requestAnimFrame(animate);

 51                 

 52                 pause=false;

 53                 $("#b1").click(function(){

 54                 

 55                  pause=!pause;

 56                 

 57                 });

 58 

 59             });

 60             // 

 61             function getRandom(min, max) {

 62 

 63                 return parseInt(Math.random() * (max - min) + min);

 64 

 65             }

 66 

 67 

 68 

 69             SKY_VELOCITY = 50;

 70             skyOffset = 0;

 71 

 72             C1_VELOCITY = 100;

 73             c1Offset = 0;

 74 

 75             C2_VELOCITY = 150;

 76             c2Offset = 0;

 77 

 78             C3_VELOCITY = 200;

 79             c3Offset = 0;

 80 

 81             fangxiag = 1;

 82 

 83             function drawBack() {

 84                 

 85                 // 

 86                 skyOffset = skyOffset < sky.width ? skyOffset + SKY_VELOCITY / fps : 0;

 87                 

 88                 // / /   

 89                 c1Offset = c1Offset < canvas.width ? c1Offset + C1_VELOCITY / fps : 0;

 90                 c2Offset = c2Offset < canvas.width ? c2Offset + C2_VELOCITY / fps : 0;

 91                 c3Offset = c3Offset < canvas.width ? c3Offset + C3_VELOCITY / fps : 0;

 92 

 93                 // 

 94                 content.save();

 95                 content.translate(-skyOffset, 0);

 96                 content.drawImage(sky, 0, 0);

 97                 content.drawImage(sky, sky.width, 0);

 98                 content.restore();

 99 

100                 content.save();

101                 content.translate(-c1Offset, 0);

102                 content.drawImage(c1, 50, 50);

103                 content.drawImage(c1, 600, 70);

104                 content.drawImage(c1, 1050, 50);

105                 content.drawImage(c1, 1600, 70);

106                 content.restore();

107 

108                 content.save();

109                 content.translate(-c2Offset, 0);

110                 content.drawImage(c2, 130, 120);

111                 content.drawImage(c2, 730, 170);

112                 content.drawImage(c2, 1130, 120);

113                 content.drawImage(c2, 1730, 170);

114                 content.restore();

115 

116                 content.save();

117                 content.translate(-c3Offset, 0);

118                 content.drawImage(c3, 600, 250);

119                 content.drawImage(c3, 100, 320);

120                 content.drawImage(c3, 1600, 250);

121                 content.drawImage(c3, 110, 320);

122                 content.restore();

123 

124             }

125 

126 

127             fps = 0;

128             // 

129             function animate(time) {

130                 

131                 if(!pause){

132                 

133                // 

134                 content.clearRect(0, 0, canvas.width, canvas.height);

135                 // fps

136                 fps = geFps(time);

137 

138                 // 

139                 drawBack();

140                 

141                 // 

142                 content.fillText(fps.toFixed() + " fps", 20, 20);

143                 

144                 }else{

145               

146                 lastFpsUpdateTime=time;              

147               

148             }

149                 // 

150                 requestAnimFrame(animate);

151             }

152 

153 

154 

155             var lastFpsUpdateTime = 0;

156             // fps

157             function geFps(time) {

158 

159                 fps = 1000 / (time - lastFpsUpdateTime);

160 

161                 lastFpsUpdateTime = time;

162 

163                 return fps;

164 

165             }

166         </script>

167     </head>

168     

169     <body>

170         <div id="control">

171             <input id="b1" type="button" value=" " />

172            

173         </div>

174         <div id="containter">

175             <canvas id="canavas" width="500" height="200"></canvas>

176         </div>

177     </body>

178 

179 </html>

 
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