180 * Math.atan(Math.abs(e2.getX() - userDragFirstX) / Math.abs(e2.getY() - userDragFirstY)) / (Math.PI);

这段代码是用来计算用户手指在屏幕上拖动时的滑动角度。其中，e2.getX() 和 e2.getY() 是用户手指在屏幕上的当前坐标，而 userDragFirstX 和 userDragFirstY 是用户手指按下时的坐标。具体来说，该代码先计算出用户手指在水平方向和竖直方向上的位移差（即 abs(e2.getX() - userDragFirstX) 和 abs(e2.getY() - userDragFirstY)），然后用 Math.atan() 方法计算出该位移差所对应的弧度值，最后将弧度值转换为角度值返回。其中，180 / Math.PI 是将弧度转换为角度的系数。

相关问题

if v_0[2] > 0: v_0[2] = math.sqrt(m * g / k) * math.tan(-math.sqrt(k * g / m) * dt + math.atan(v_0[2] * math.sqrt(k / (m * g)))) Position[2] = (m / k) * math.log(abs(math.cos(math.sqrt(k * g / m)*dt) + v_0[2] * math.sqrt(k * g / m) * math.sin(dt * math.sqrt(k * g / m)))) + Position[2] else: Position[2] = -m/(2*k)*math.log((1+math.exp(2*dt*math.sqrt(k*g/m)))**2/(4*math.exp(2*dt*math.sqrt(k*g/m)))) + \ Position[2] + v_0[2] v_0[2] = math.sqrt((m*g/k))*(1-math.exp(2*dt*math.sqrt(k*g/m)))/(1+math.exp(2*dt*math.sqrt(k*g/m)))+v_0[2]

这段代码是关于物体在空气阻力下自由落体的运动轨迹的计算，其中v_0[2]是物体的初始速度，Position[2]是物体的初始高度，m是物体的质量，k是空气阻力系数，g是重力加速度，dt是时间间隔。如果物体的初始速度朝上，则使用第一个公式计算物体的高度和速度，如果物体的初始速度朝下，则使用第二个公式计算物体的高度和速度。

// Decimal hour of the day at Greenwich double greenwichtime = hour - timezone + minute / 60 + second / 3600; // Days from J2000, accurate from 1901 to 2099 double daynum = 367 * year - 7 * (year + (month + 9) / 12) / 4 + 275 * month / 9 + day - 730531.5 + greenwichtime / 24; //Mean longitude of the sun double mean_long = daynum * 0.01720279239 + 4.894967873; double mean_anom = daynum * 0.01720197034 + 6.240040768; double eclip_long = mean_long + 0.03342305518 * Math.sin(mean_anom) + 0.0003490658504 * Math.sin(2 * mean_anom); double obliquity = 0.4090877234 - 0.000000006981317008 * daynum; double rasc = Math.atan2(Math.cos(obliquity) * Math.sin(eclip_long), Math.cos(eclip_long)); double decl = Math.asin(Math.sin(obliquity) * Math.sin(eclip_long)); double sidereal = 4.894961213 + 6.300388099 * daynum + rlon; double hour_ang = sidereal - rasc; double elevation = Math.asin(Math.sin(decl) * Math.sin(rlat) + Math.cos(decl) * Math.cos(rlat) * Math.cos(hour_ang)); //Local azimuth of the sun double azimuth = Math.atan2(-Math.cos(decl) * Math.cos(rlat) * Math.sin(hour_ang), Math.sin(decl) - Math.sin(rlat) * Math.sin(elevation)); azimuth = into_range(Math.toDegrees(azimuth), 0, 360); elevation = into_range(Math.toDegrees(elevation), -180, 180);抽出常量

您可以将这些常量提取出来，并使用它们来计算方位角（azimuth）和仰角（elevation）。以下是一个示例代码：

import java.util.TimeZone;

public class Main {
    private static final double MEAN_LONGITUDE_OFFSET = 4.894967873;
    private static final double MEAN_ANOMALY_COEFFICIENT = 0.01720197034;
    private static final double ECLIPTIC_LONGITUDE_COEFFICIENT_1 = 0.03342305518;
    private static final double ECLIPTIC_LONGITUDE_COEFFICIENT_2 = 0.0003490658504;
    private static final double OBLIQUITY_COEFFICIENT_1 = 0.4090877234;
    private static final double OBLIQUITY_COEFFICIENT_2 = 0.000000006981317008;
    private static final double SIDEREAL_COEFFICIENT_1 = 4.894961213;
    private static final double SIDEREAL_COEFFICIENT_2 = 6.300388099;

    public static void main(String[] args) {
        // 其他变量的定义和赋值

        // Decimal hour of the day at Greenwich
        double greenwichtime = hour - timezone + minute / 60 + second / 3600;

        // Days from J2000, accurate from 1901 to 2099
        double daynum = 367 * year - 7 * (year + (month + 9) / 12) / 4 + 275 * month / 9 + day - 730531.5 + greenwichtime / 24;

        //Mean longitude of the sun
        double mean_long = daynum * MEAN_ANOMALY_COEFFICIENT + MEAN_LONGITUDE_OFFSET;

        double mean_anom = daynum * MEAN_ANOMALY_COEFFICIENT + 6.240040768;

        double eclip_long = mean_long + ECLIPTIC_LONGITUDE_COEFFICIENT_1 * Math.sin(mean_anom) + ECLIPTIC_LONGITUDE_COEFFICIENT_2 * Math.sin(2 * mean_anom);

        double obliquity = OBLIQUITY_COEFFICIENT_1 - OBLIQUITY_COEFFICIENT_2 * daynum;

        double rasc = Math.atan2(Math.cos(obliquity) * Math.sin(eclip_long), Math.cos(eclip_long));

        double decl = Math.asin(Math.sin(obliquity) * Math.sin(eclip_long));

        double sidereal = SIDEREAL_COEFFICIENT_1 + SIDEREAL_COEFFICIENT_2 * daynum + rlon;

        double hour_ang = sidereal - rasc;

        double elevation = Math.asin(Math.sin(decl) * Math.sin(rlat) + Math.cos(decl) * Math.cos(rlat) * Math.cos(hour_ang));

        //Local azimuth of the sun
        double azimuth = Math.atan2(-Math.cos(decl) * Math.cos(rlat) * Math.sin(hour_ang), Math.sin(decl) - Math.sin(rlat) * Math.sin(elevation));

        azimuth = into_range(Math.toDegrees(azimuth), 0, 360);
        elevation = into_range(Math.toDegrees(elevation), -180, 180);

        // 其他操作
    }

    private static double into_range(double value, double min, double max) {
        double range = max - min;
        return ((value - min) % range + range) % range + min;
    }
}

这样，您可以在计算方位角和仰角时直接使用这些常量，使代码更加易读和易于维护。