How to Draw Sinusoids with PHP?

Hi,

I'm learning to draw with PHP I can do shapes and lines and all sort of stuff. Can I also draw sinusoids or other wave-form shapes that are generated by mathematical formulas? Any ideas please!

 

Yes, you can.
change x from 0 to 100, for example, get y=100*sin(x) and place dots on those coordinates.

 

that's cool, i always wanted to use PHP for math

@Ashine: btw, can you give a simple example of that?

 

Try this

<?php
//create our image 1000*400 pixels
$im = imagecreatetruecolor(1000, 400);
// set white color
$w = imagecolorallocate($im,255,255,255);
for ($x=1;$x<=1000;$x++) {
	$y = 200 + 200*sin($x/100);
        //put pixels
	imagesetpixel($im,$x,$y,$w);
}
//output image
header('Content-Type: image/png');
imagepng($im);
?>

PHP:

$y = 200 + 200*sin($x/100);
first 200 is to place graph in middle of image, cause sin range is -1..1, so 200*sin($x/100); will give -200..200
play with 100 - change it to 50 or 200 to set horizontal scale,

 

Wow, AsHinE, that is marvelous! Get some greens for that!!!