Flutter学习笔记4-dart:math

引用

import 'dart:math';

三角学

// Cosine
assert(cos(pi) == -1.0);

// Sine
var degrees = 30;
var radians = degrees * (pi / 180);
// radians is now 0.52359.
var sinOf30degrees = sin(radians);
// sin 30° = 0.5
assert((sinOf30degrees - 0.5).abs() < 0.01);

比大小

assert(max(1, 1000) == 1000);
assert(min(1, -1000) == -1000);

常量

print(e); // 2.718281828459045
print(pi); // 3.141592653589793
print(sqrt2); // 1.4142135623730951

随机数

var random = Random();
random.nextDouble(); // Between 0.0 and 1.0: [0, 1)
random.nextInt(10); // Between 0 and 9.
random.nextBool(); // true or false