sin
(PHP 4, PHP 5)
sin — Sine
Description
float sin
( float
$arg
)
sin() returns the sine of the arg
parameter. The arg parameter is in radians.
Parameters
-
arg -
A value in radians
Return Values
The sine of arg
Examples
Example #1 sin() example
<?php
// Precision depends on your precision directive
echo sin(deg2rad(60)); // 0.866025403 ...
echo sin(60); // -0.304810621 ...
?>
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- Математические функции
- abs
- acos
- acosh
- asin
- asinh
- atan2
- atan
- atanh
- base_convert
- bindec
- ceil
- cos
- cosh
- decbin
- dechex
- decoct
- deg2rad
- exp
- expm1
- floor
- fmod
- getrandmax
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- hypot
- intdiv
- is_finite
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- is_nan
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- log10
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- max
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- mt_rand
- mt_srand
- octdec
- pi
- pow
- rad2deg
- rand
- round
- sin
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- tan
- tanh
Коментарии
You can use SIN & COS to create/draw circles.
Please beware that the circle's center is also your base point (0,0). So without specifying an offset, some coordinates will be negative.
<?php
$circleRadius = 70;
$offsetX = 100;
$offsetY = 100;
for($i = 0; $i <= 360; ++$i) {
$x = round(cos($i * M_PI / 180) * $circleRadius);
$y = round(sin($i * M_PI / 180) * $circleRadius);
// Draw some pixel, or do something else here.
imagesetpixel($GDimage, $x + $offsetX, $y + $offsetY, $GDcolor);
}
?>