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Random number generator only generating one random number
Random not that random
这是我第一次尝试使用类和对象，我完全不知道如何处理我目前所处的情况。我正在创建一个需要在屏幕边缘生成敌人的游戏, 所以我创建了一个方法，它创建 10 个对象并随机选择一条边和一个合适的坐标来分配给它们。
private void spawner()
{
if (enemies.Count < 10)
{
int a;
a = 10 - enemies.Count;
for (int i = 0; i < a; i++)
{
int x, y, c;
Random random = new Random();
c = random.Next(0, 4);
if (c == 0)
{
x = random.Next(0, 839);
y = 1;
}
else if (c == 1)
{
y = random.Next(0, 647);
x = 1;
}
else if (c == 2)
{
x = 839;
y = random.Next(0, 647);
}
else
{
y = 647;
x = random.Next(0, 839);
}
enemies.Add(new Enemy(5, 25, 3, new Point(x, y)));
enemies[enemies.Count - 1].adjustPosition(player1.centreX, player1.centreY);
}
}
}
然后我调用 Enemy 类中的方法，使坐标更靠近 Player 控制对象的中心，并创建 3 个用于绘制敌人的新点:enemies[enemies.Count - 1] .adjustPosition(player1.centreX, player1.centreY);
public class Enemy
{
public int enemyLife { get; set; }
public Point enemyCentre { get; set; }
public int enemyRadius { get; set; }
public double enemySpeed { get; set; }
public Point[] enemyVertices { get; private set; }
public Enemy(int life, int radius, double speed, Point centre)
{
enemyLife = life;
enemyCentre = centre;
enemyRadius = radius;
enemySpeed = speed;
}
public void adjustPosition(int centreX, int centreY)
{
double vx = 0;
double vy = 0;
double mag = 0;
int x, y;
if (enemyCentre.X != 0)
{
vx = centreX - enemyCentre.X;
vy = centreY - enemyCentre.Y;
mag = Math.Sqrt(vx * vx + vy * vy); // length
vx /= mag;
vy /= mag;
x = (int)((double)enemyCentre.X + vx * enemySpeed);
y = (int)((double)enemyCentre.Y + vy * enemySpeed);
enemyCentre = new Point(x, y);
int px, py, px2, py2, px3, py3;
double angle;
vx = centreX - x;
vy = centreY - y;
mag = Math.Sqrt(vx * vx + vy * vy); // length
vx /= mag;
vy /= mag;
px = (int)((double)x + vx * 20);
py = (int)((double)y + vy * 20);
angle = Math.Atan2(centreY - y, centreX - x);
px2 = (int)(px + (-30 * Math.Cos(0.785398163 + angle)));
py2 = (int)(py + (-30 * Math.Sin(0.785398163 + angle)));
px3 = (int)(px + (-30 * Math.Cos(-0.785398163 + angle)));
py3 = (int)(py + (-30 * Math.Sin(-0.785398163 + angle)));
Point[] points = new Point[3];
points[0] = new Point(px, py);
points[1] = new Point(px2, py2);
points[2] = new Point(px3, py3);
enemyVertices = points;
}
}
}
问题是，当我尝试使用“开始调试”来执行程序时，每个创建的对象与最后添加到列表中的对象共享相同的中心坐标。然而，当我在将对象添加到列表并单步执行代码之前添加断点时，为对象分配了应有的随机值。此外，如果我在手动执行某些对象的代码后删除断点，则手动运行的对象将包含随机值，而其余对象将共享相同的值。有谁知道可能导致此问题的原因是什么？