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Canvas rotation-Special Effects of HTML5

Source: Internet
Author: User
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The content of translate.html is as follows:


[Html]
<! Doctype html>
<Html>
<Head>
<Script type = "text/javascript" src = "jquery-1.7.2.min.js"> </script>
<Script type = "text/javascript" src = "translate. js"> </script>
<Script type = "text/javascript">
$ (Document). ready (function (){
 
});
</Script>
</Head>
<Body>
<Canvas id = "simple"> </canvas>
</Body>
</Html>

<! Doctype html>
<Html>
<Head>
<Script type = "text/javascript" src = "jquery-1.7.2.min.js"> </script>
<Script type = "text/javascript" src = "translate. js"> </script>
<Script type = "text/javascript">
$ (Document). ready (function (){

});
</Script>
</Head>
<Body>
<Canvas id = "simple"> </canvas>
</Body>
</Html>

The code for translate. js is as follows:


[Javascript]
(Function (){
Var canvas = null,
Context = null,
Angle = 0;
Function resetCanvas (){
Canvas = document. getElementById ("simple ");
Canvas. width = window. innerWidth;
Canvas. height = window. innerHeight;
Context = canvas. getContext ("2d ");
}
Function animate (){
Context. save ();
Try {
// Clear the canvas
Context. clearRect (0, 0, canvas. width, canvas. height );
// Set the origin
Context. translate (canvas. width * 0.5, canvas. height * 0.5 );
// Rotation Angle
Context. rotate (angle );
// Set the fill color
Context. fillStyle = "# FF0000 ";
// Draw a rectangle
Context. fillRect (-30,-30, 60, 60 );
Angle ++ = 0.05 * Math. PI;
}
Finally {
Context. restore ();
}
}
$ (Window). bind ("resize", resetCanvas). bind ("reorient", resetCanvas );
$ (Document). ready (function (){
Window. scrollTo (0, 1 );
ResetCanvas ();
SetInterval (animate, 40 );
});
})();

(Function (){
Var canvas = null,
Context = null,
Angle = 0;
Function resetCanvas (){
Canvas = document. getElementById ("simple ");
Canvas. width = window. innerWidth;
Canvas. height = window. innerHeight;
Context = canvas. getContext ("2d ");
}
Function animate (){
Context. save ();
Try {
// Clear the canvas
Context. clearRect (0, 0, canvas. width, canvas. height );
// Set the origin
Context. translate (canvas. width * 0.5, canvas. height * 0.5 );
// Rotation Angle
Context. rotate (angle );
// Set the fill color
Context. fillStyle = "# FF0000 ";
// Draw a rectangle
Context. fillRect (-30,-30, 60, 60 );
Angle ++ = 0.05 * Math. PI;
}
Finally {
Context. restore ();
}
}
$ (Window). bind ("resize", resetCanvas). bind ("reorient", resetCanvas );
$ (Document). ready (function (){
Window. scrollTo (0, 1 );
ResetCanvas ();
SetInterval (animate, 40 );
});
})();
Open translate.html with a browser supporting hmtl5to see a red circle

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
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