scss中是没有三角函数的,不过可以自己根据泰勒展开式实现以下,参考了3篇博客。
博客1:https://blog.csdn.net/natsuyu/article/details/52191181
博客2:http://jimyuan.github.io/blog/2015/02/12/trigonometry-in-sass.html
博客3:https://unindented.org/articles/trigonometry-in-sass/
具体实现方式如下:
@function fact($number) {
$value: 1;
@if $number>0 {
@for $i from 1 through $number {
$value: $value * $i;
}
}
@return $value;
}
@function pow($number, $exp) {
$value: 1;
@if $exp>0 {
@for $i from 1 through $exp {
$value: $value * $number;
}
}
@else if $exp < 0 {
@for $i from 1 through -$exp {
$value: $value / $number;
}
}
@return $value;
}
@function rad($angle) {
$unit: unit($angle);
$unitless: $angle / ($angle * 0 + 1);
@if $unit==deg {
$unitless: $unitless / 180 * pi();
}
@return $unitless;
}
@function pi() {
@return 3.14159265359;
}
@function sin($angle) {
$sin: 0;
$angle: rad($angle);
// Iterate a bunch of times.
@for $i from 0 through 10 {
$sin: $sin + pow(-1, $i) * pow($angle, (2 * $i + 1)) / fact(2 * $i + 1);
}
@return $sin;
}
@function cos($angle) {
$cos: 0;
$angle: rad($angle);
// Iterate a bunch of times.
@for $i from 0 through 10 {
$cos: $cos + pow(-1, $i) * pow($angle, 2 * $i) / fact(2 * $i);
}
@return $cos;
}
@function tan($angle) {
@return sin($angle) / cos($angle);
}