first commit

triangle.scss

@@ -0,0 +1,63 @@
+//***************************************
+// * 三角函数
+//***************************************
+@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);
+}