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HTML5 Use the DrawImage () method to draw an image

Source: Internet
Author: User
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First, draw the image

Draws an image using the DrawImage () method. The drawing environment provides three different versions of the method.
DrawImage (Image,x,y): Draws a picture in canvas (x,y).
DrawImage (Image,x,y,width,height): Draws a picture in canvas (x,y) and scales it to the specified width and height.
DrawImage (image,sourcex,sourcey,sourcewidth,sourceheight,x,y,width,height): Cut out a rectangular area from the picture (Sourcex,sourcey, Sourcewidth,sourceheight), scaled to the specified width and height, and drawn in canvas (x,y).

Second, label

Before you draw a picture, you also need to load the picture into the browser. Here we just add a tag behind the canvas tag.



Third, draw the picture

Copy Code code as follows:


<! DOCTYPE html>


<html>


<head>


<meta http-equiv= "Content-type" content= "text/html"; CharSet = utf-8 ">


<title>HTML5</title>


<script type= "text/javascript" charset = "Utf-8" >


//This function will be called after the page is fully loaded


function pageLoaded ()


{


Get a reference to the canvas object, note that the Tcanvas name must be the same as the ID in the following body


var canvas = document.getElementById (' Tcanvas ');


//Get the 2D drawing environment of the canvas


var context = Canvas.getcontext (' 2d ');


//Get a reference to a picture object


var image = document.getElementById (' tkjpg ');


//Draw pictures at (0,50)


context.drawimage (image,0,50);


//Shrink the picture to the original half size


context.drawimage (IMAGE,200,50,165/2,86/2);


//Draw part of the picture (cut 0.7 from the top left corner of the picture)


context.drawimage (image,0,0,0.7*165,0.7*86,300,70,0.7*165,0.7*86);


}


</script>


</head>


<body onload= "pageLoaded ();" >


<canvas width = "height" = "id" = "tcanvas" style = "border:black 1px solid;" >


<!--Displays the following font if the browser does not support-->


Tip: Your browser does not support <canvas> tags


</canvas>


<img src = "tk.jpg" id = "Tkjpg" >


</body>


</html>


Four, draw the effect

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Related Keywords:
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