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Thread: How to draw a rectangle using Javascript?

  1. #1
    Join Date
    Feb 2006
    Posts
    19

    Red face How to draw a rectangle using Javascript?

    Hi,

    How to use Javascript to draw a rectangle when the user drags the mouse across the webpage?

    I know the drawing methods but how do we allow the user to be able to draw a rectangle on the webpage?

    e.g When the user drags the mouse across the page and releases the mouse button, a rectangle appears.

  2. #2
    Join Date
    Dec 2003
    Location
    Bucharest, ROMANIA
    Posts
    15,428
    here u are:
    PHP Code:
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <
    html>
    <
    head>
    <
    title>Untitled Document</title>
    <
    meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
    <
    meta http-equiv="Content-Style-Type" content="text/css">
    <
    meta http-equiv="Content-Script-Type" content="text/javascript">
    <
    style type="text/css">
    <!--
    .
    square {
        
    border1px solid #FF0000;
        
    positionabsolute;
    }
    -->
    </
    style>
    <
    script type="text/JavaScript">
    var 
    d;var posx;var posy;var initx=false;var inity=false
    function getMouse(obj,e){
    posx=0;posy=0;
    var 
    ev=(!e)?window.event:e;//Moz:IE
    if (ev.pageX){//Moz
    posx=ev.pageX+window.pageXOffset;
    posy=ev.pageY+window.pageYOffset;
    }
    else if(
    ev.clientX){//IE
    posx=ev.clientX+document.body.scrollLeft;
    posy=ev.clientY+document.body.scrollTop;
    }
    else{return 
    false}//old browsers
    obj.onmousedown=function(){
    initx=posxinity=posy;
    document.createElement('div');
    d.className='square'
    d.style.left=initx+'px';d.style.top=inity+'px';
    document.getElementsByTagName('body')[0].appendChild(d)
    }
    obj.onmouseup=function(){initx=false;inity=false;}
    if(
    initx){
    d.style.width=Math.abs(posx-initx)+'px';d.style.height=Math.abs(posy-inity)+'px';
    d.style.left=posx-initx<0?posx+'px':initx+'px';
    d.style.top=posy-inity<0?posy+'px':inity+'px';
    }
    </
    script>
    </
    head>
    <
    body onmousemove="getMouse(this,event)">
    &
    nbsp;
    </
    body>
    </
    html
    Last edited by Kor; 05-08-2006 at 05:07 AM.

  3. #3
    Join Date
    Feb 2006
    Posts
    19
    I've tried it and it can work now

    Thank you!

  4. #4
    Join Date
    Feb 2006
    Posts
    19
    Hmm.....

    About the drawing of rectangles, there is a drawing space within the webpage and the drawing can only be done within that space.

    I have thought of inserting a div.

    <div id="Canvas" style="width:200px; height:200px; border:solid black;"

    How to integrate the div into the code given above?
    And can I use onDrag = "getMouse(event);" for the div ?

    something like:

    <div id="Canvas" style="width:200px; height:200px; border:solid black;"
    onDrag = "getMouse(event);">

  5. #5
    Join Date
    Dec 2005
    Location
    India
    Posts
    490
    modify Kor's code slightly.

    <body>
    <div id="Canvas" style="width:200px; height:200px; border:solid black;"
    onmousemove = "getMouse(event);">


    obj.onmousedown=function(){
    initx=posx; inity=posy;
    d = document.createElement('div');
    d.className='square'
    d.style.left=initx+'px';d.style.top=inity+'px';
    Canvas.appendChild(d)
    }

    should work..

  6. #6
    Join Date
    Apr 2012
    Posts
    1

    javascript code for drawing dynamic rectangle

    pls provide the whole procedure for drawing the rectangle using javascript upon usr action..

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