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 transform() Method
Example
Draw a rectangle, add a new transformation matrix with transform(), draw the rectangle again, add a new transformation matrix, then draw the rectangle again. Notice that each time you call transform(), it builds on the previous transformation matrix:
JavaScript:
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.fillStyle="yellow";
ctx.fillRect(0,0,250,100)
ctx.transform(1,0.5,-0.5,1,30,10);
ctx.fillStyle="red";
ctx.fillRect(0,0,250,100);
ctx.transform(1,0.5,-0.5,1,30,10);
ctx.fillStyle="blue";
ctx.fillRect(0,0,250,100);
var ctx=c.getContext("2d");
ctx.fillStyle="yellow";
ctx.fillRect(0,0,250,100)
ctx.transform(1,0.5,-0.5,1,30,10);
ctx.fillStyle="red";
ctx.fillRect(0,0,250,100);
ctx.transform(1,0.5,-0.5,1,30,10);
ctx.fillStyle="blue";
ctx.fillRect(0,0,250,100);
Try it yourself »
Browser Support
Internet Explorer 9, Firefox, Opera, Chrome, and Safari support the transform() method.
Note: Internet Explorer 8 and earlier versions, do not support the <canvas> element.
Definition and Usage
Each object on the canvas has a current transformation matrix.
The transform() method replaces the current transformation matrix. It multiplies the current transformation matrix with the matrix described by:
| a | c | e |
| b | d | f |
| 0 | 0 | 1 |
In other words, the transform() method lets you scale, rotate, move, and skew the current context.
Note: The transformation will only affect drawings made after the transform() method is called.
Note: The transform() method behaves relatively to other transformations made by rotate(), scale(), translate(), or transform(). Example: If you already have set your drawing to scale by two, and the transform() method scales your drawings by two, your drawings will now scale by four.
Tip: Check out the setTransform() method, which does not behave relatively to other transformations.
| JavaScript syntax: | context.transform(a,b,c,d,e,f); |
|---|
Parameter Values
| Parameter | Description | Play it |
|---|---|---|
| a | Scales the drawing horizontally | Play it » |
| b | Skew the the drawing horizontally | Play it » |
| c | Skew the the drawing vertically | Play it » |
| d | Scales the drawing vertically | Play it » |
| e | Moves the the drawing horizontally | Play it » |
| f | Moves the the drawing vertically | Play it » |
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]
