HTML Reference
HTML by Alphabet HTML by Function HTML Attributes HTML Events HTML Canvas HTML Audio/Video HTML Doctypes HTML Colornames HTML Colorpicker HTML Colormixer HTML Character Sets HTML ASCII HTML ISO-8859-1 HTML Symbols HTML URL Encode HTML Lang Codes HTTP Messages HTTP Methods Keyboard ShortcutsHTML Tags
<!--> <!DOCTYPE> <a> <abbr> <acronym> <address> <applet> <area> <article> <aside> <audio> <b> <base> <basefont> <bdi> <bdo> <big> <blockquote> <body> <br> <button> <canvas> <caption> <center> <cite> <code> <col> <colgroup> <command> <datalist> <dd> <del> <details> <dfn> <dialog> <dir> <div> <dl> <dt> <em> <embed> <fieldset> <figcaption> <figure> <font> <footer> <form> <frame> <frameset> <head> <header> <hgroup> <h1> - <h6> <hr> <html> <i> <iframe> <img> <input> <ins> <kbd> <keygen> <label> <legend> <li> <link> <map> <mark> <menu> <meta> <meter> <nav> <noframes> <noscript> <object> <ol> <optgroup> <option> <output> <p> <param> <pre> <progress> <q> <rp> <rt> <ruby> <s> <samp> <script> <section> <select> <small> <source> <span> <strike> <strong> <style> <sub> <summary> <sup> <table> <tbody> <td> <textarea> <tfoot> <th> <thead> <time> <title> <tr> <track> <tt> <u> <ul> <var> <video> <wbr>HTML canvas scale() Method
Example
Draw a rectangle, scale to 200%, then draw rectangle again:
JavaScript:
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.strokeRect(5,5,25,15);
ctx.scale(2,2);
ctx.strokeRect(5,5,25,15);
var ctx=c.getContext("2d");
ctx.strokeRect(5,5,25,15);
ctx.scale(2,2);
ctx.strokeRect(5,5,25,15);
Try it yourself »
Browser Support
Internet Explorer 9, Firefox, Opera, Chrome, and Safari support the scale() method.
Note: Internet Explorer 8 and earlier versions, do not support the <canvas> element.
Definition and Usage
The scale() method scales the current drawing, bigger or smaller.
Note: If you scale a drawing, all future drawings will also be scaled. The positioning will also be scaled. If you scale(2,2); drawings will be positioned twice as far from the left and top of the canvas as you specify.
| JavaScript syntax: | context.scale(scalewidth,scaleheight); |
|---|
Parameter Values
| Parameter | Description | Play it |
|---|---|---|
| scalewidth | Scales the width of the current drawing (1=100%, 0.5=50%, 2=200%, etc.) | Play it » |
| scaleheight | Scales the height of the current drawing (1=100%, 0.5=50%, 2=200%, etc.) | Play it » |
More Examples
Example
Draw a rectangle, scale to 200%, draw rectangle again, scale to 200%, draw rectangle again, scale to 200%, draw rectangle again:
JavaScript:
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.strokeRect(5,5,25,15);
ctx.scale(2,2);
ctx.strokeRect(5,5,25,15);
ctx.scale(2,2);
ctx.strokeRect(5,5,25,15);
ctx.scale(2,2);
ctx.strokeRect(5,5,25,15);
var ctx=c.getContext("2d");
ctx.strokeRect(5,5,25,15);
ctx.scale(2,2);
ctx.strokeRect(5,5,25,15);
ctx.scale(2,2);
ctx.strokeRect(5,5,25,15);
ctx.scale(2,2);
ctx.strokeRect(5,5,25,15);
Try it yourself »
HTML Canvas Reference
W3Schools' Online Certification
The perfect solution for professionals who need to balance work, family, and career building.
More than 10 000 certificates already issued!
The HTML Certificate documents your knowledge of HTML.
The HTML5 Certificate documents your knowledge of advanced HTML5.
The CSS Certificate documents your knowledge of advanced CSS.
The JavaScript Certificate documents your knowledge of JavaScript and HTML DOM.
The jQuery Certificate documents your knowledge of jQuery.
The XML Certificate documents your knowledge of XML, XML DOM and XSLT.
The ASP Certificate documents your knowledge of ASP, SQL, and ADO.
The PHP Certificate documents your knowledge of PHP and SQL (MySQL).
Your suggestion:
Close [X]
Thank You For Helping Us!
Your message has been sent to W3Schools.
Close [X]
