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HTML5 canvas+ native JavaScript real-time Get text box content draw picture watermark

Source: Internet
Author: User
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Recently, a customer asked to add text watermark effect on the webpage picture, and the content is obtained from the text input box of the current webpage in real time, studied a half-day, in the net also refer to a lot of friends of the method, plus the garden enthusiastic good buddies help finally realized, first look at:

The code is as follows:

1 <!DOCTYPE HTML>                                                                        2 <Head>3     <MetaCharSet= "UTF-8">4     <title>Drawing by input text</title>                                                                            5 </Head>6 7 <Body>8 <CanvasID= "MyCanvas"width= "+"Height= "$" >9 Your Browser does not support the HTML5 canvas tag.Ten </Canvas> One  A <Script>                                                     -      - window.onload= function () { the         -         varimg= NewImage (); - img.src= './img/demo.jpg'; - Img.onload= function () { +             // -             varCanvas=document.getElementById ("MyCanvas"); +             varCTX=Canvas.getcontext ("2d");  A             // at ctx.drawimage (IMG,0, 0); -  - Ctx.font= "80px Microsoft Yahei"; - Ctx.fillstyle= "Rgba (252,255,255,0.8)"; -             //the contents of the text box are added to the picture area. - document.getElementById ("btn"). onclick= function () { in Ctx.filltext (document.getElementById ("text"). Value, -,  $); -             //document.getElementById ("text"). Value = ""//You can choose whether to empty the contents of the input box to     } +     } -     }     the </Script> *  $ <BR> Panax Notoginseng <inputtype= "text"ID= "text"value="" /> - <inputtype= "button"ID= "BTN"value= "Submit"Click= "Draw" /> the                                                                          + </Body> A </HTML>

HTML5 canvas+ native JavaScript real-time Get text box content draw picture watermark

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HTML5 canvas+ native JavaScript real-time Get text box content draw picture watermark

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Related Keywords:
javascript canvas draw html5 canvas text editor get rid of watermark on picture android canvas draw canvas draw transparent rectangle javascript get content from url html5 canvas clock

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