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The canvas tag
1.
<canvas>
Dave Ross Suburban Chicago PHP & Web Development Meetup January 7, 2010
2.
I just learned
how to use <canvas>
3.
You can too!
4.
https://developer.mozilla.org/en/Canvas_tutorial
5.
<canvas> is a
new tag
6.
introduced by Apple adopted
by Firefox
7.
supported by others (there’s
Javascript for this guy)
8.
<canvas id=”mycanvas” width=”320” height=”200”>
</canvas>
9.
don’t forget the
closing tag
10.
put “fallback” content
in the middle
11.
<canvas>browser too old!</canvas>
12.
without further ado,
a canvas:
13.
amazing!
14.
<canvas> is a
canvas you draw on using Javascript
15.
var canvas =
document.getElementById('mycanvas'); var ctx = canvas.getContext('2d');
16.
ctx.fillStyle = "rgb(200,0,0)";
ctx.fillRect (0, 0, 320, 200);
17.
hey, there’s my
canvas!
18.
primatives rectangles paths arcs curves (bezier and
quadratic) images (from an <img> tag) fills (solid, gradient, patterns of images) shadows
19.
transformations transforms rotate the whole
canvas scale compositing clipping
20.
save() and restore()
state
21.
animation clear the canvas save
the canvas state draw shapes restore the canvas state repeat
22.
skifree game using
<canvas>
23.
cufon renders using
<canvas>
24.
experimental 3d using
<canvas>
25.
questions?
26.
dave ross php developer wordpress
plugin creator meetup organizer cat shelter volunteer davidmichaelross.com
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