Math.cos

函数原型

float Math.cos(float x);

功能

余弦

说明

计算cos(x)，x为弧度值

示例

#define Pi 3.14159265

void main()
{
    int i, x1, y1, x2, y2;
    x1 = 20;
    y1 = 40;
    Line(15, 40, 145, 40, 1);
    Line(20, 0, 20, 79, 1);
    for (i = 3; i <= 360; i = i + 3) {
        x2 = x1 + 1;
        y2 = 40 - Math.cos(i * Pi / 180) * 36 + 0.5;
        Line(x1, y1, x2, y2, 1);
        x1 = x2;
        y1 = y2;
    }
    getchar();
}