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HTML5 Graphic Drawing

Source: Internet
Author: User
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To draw a graphic in HTML5, first place a canvas element

<id= "Canvas"  width= " max" height= "  />

The canvas's code is actually placed in a JavaScript script, so you get the ID of the element first

var canvas =document.getelementbyid ("canvas"); if (canvas==null) return False;var Context=canvas.getcontext ("2d"); Context.fillstyle= "#eeeeff"; Context.fillrect (0,0,400,300); context.fillstyle= "Red"; context.strokestyle= "Blue"; Context.linewidth=1;context.fillrect (50,50,1001,100); Context.strokerect (50,50,100,100);

All code

<!DOCTYPE HTML><HTML><Head>   <MetaCharSet= "Utf-8"/>   <title>Example for HTML5</title>      </Head><Body><Divclass= "ShowMore">   <atitle= "This is a hint"ID= "tipping">Tips</a>   <CanvasID= "Canvas"width= "The "Height= "+"/></Div><Scripttype= "Text/javascript">varCanvas=document.getElementById ("Canvas");if(Canvas==NULL) Alert ("NULL");varContext=Canvas.getcontext ('2d'); Context.fillstyle="#eeeeff"; Context.fillrect (0,0, -, -); Context.fillstyle="Red"; Context.strokestyle="Blue"; Context.linewidth=1; Context.fillrect ( -, -, -, -); Context.strokerect ( -, -, -, -);</Script></Body></HTML>

I've also been learning about jquery, so how do you draw canvas in jquery? It is important to note that the JQuery object cannot directly use the methods in the canvas, so the first thing to do is to turn the jquery object into a DOM object before you can draw, and of course, the code is not much simpler.

<!DOCTYPE HTML><HTML><Head>   <MetaCharSet= "Utf-8"/>   <title>Example for HTML5</title>   <Scriptsrc= "Jquery.js"type= "Text/javascript"></Script>   </Head><Body><Divclass= "ShowMore">   <atitle= "This is a hint"ID= "tipping">Tips</a>   <CanvasID= "Canvas"width= "The "Height= "+"/></Div><Scripttype= "Text/javascript">$ (document). Ready (function(){varCanvas=$("#canvas")[0];if(Canvas==NULL) Alert ("NULL");varContext=Canvas.getcontext ('2d'); Context.fillstyle="#eeeeff"; Context.fillrect (0,0, -, -); Context.fillstyle="Red"; Context.strokestyle="Blue"; Context.linewidth=1; Context.fillrect ( -, -, -, -); Context.strokerect ( -, -, -, -);});</Script></Body></HTML>

Draw a Circle

for (Var i=0;i<8; i++) {Context.beginpath (); Context.arc (25*i,25*i,i*10,0,math.pi*2,true); Context.closepath (); Context.fillStyle = ' Rgba (255,0,0,0.25) '; Context.fill ();}

Draw a line

Context.beginpath ();                      The starting point of the path, set this point is mainly to prevent subsequent staining affecting the previous part of the context.strokestyle= "black";              Sets the thickness and color of the line Context.linewidth=10;context.moveto (20,20);                    Set line start, End Context.lineto (30,100); Context.stroke ();                         Draw

Loading pictures

var image=new image (); image.src= "1.png"; Image.onload=function () {context.drawimage (image,20,20,20,20)    ; are drawing objects, drawing the starting point x, y, image size w,h. };

HTML5 Graphic Drawing

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