如果只有这些子弹，那看起来必然是很一般的，想想看，只有几颗子弹，孤零零的从下面跑到上面。。。。。
GameBarrage弹幕类，用于创建一些酷炫叼的弹幕其实核心也就是通过一些数学公式，然后批量AddBullet而已
先来看看类型的定义
public enum BarrageType
{
Line,
RotateAndShoot,
CrossLine,
Circle
}
初步就这四种，其余的弹幕类型都可以通过这几种组合出来
然后就是弹幕的具体实现
public class GameBarrage
{
private GameScene mScene;
public GameBarrage(GameScene scene)
{
this.mScene = scene;
}
/// <summary>
/// 圆形弹幕
/// </summary>
/// <param name="isOwn">是否为玩家子弹</param>
/// <param name="type">子弹类型</param>
/// <param name="color">子弹颜色</param>
/// <param name="position">中心点位置</param>
/// <param name="speed">子弹移动速度</param>
/// <param name="accel">子弹移动加速度</param>
/// <param name="interval">每颗子弹的角度间隔</param>
/// <param name="delay">延迟发射时间</param>
public void CreateCircle(bool isOwn, int type, int color, Vector2 position, float speed, float accel, int interval, float delay)
{
int angle = 0;
while (angle < 360)
{
mScene.AddBullet(new GameBullet(isOwn, position, Helper.GetSpeedWithAngle(angle, speed), Helper.GetSpeedWithAngle(angle, accel), type, color, delay));
angle += interval;
}
}
/// <summary>
/// 扇形弹幕
/// </summary>
/// <param name="isOwn">是否为玩家子弹</param>
/// <param name="type">子弹类型</param>
/// <param name="color">子弹颜色</param>
/// <param name="position">中心点的位置</param>
/// <param name="startAngle">扇形的起始角度（向右为0°）</param>
/// <param name="endAngle">扇形的结束角度（顺时针）</param>
/// <param name="speed">子弹移动速度</param>
/// <param name="accel">子弹移动加速度</param>
/// <param name="interval">每颗子弹的角度间隔</param>
/// <param name="duration">发射持续时间（为0表示瞬间发射所有）</param>
/// <param name="delay">延迟发射时间</param>
public void CreateRotateAndShoot(bool isOwn, int type, int color, Vector2 position, int startAngle, int endAngle, float speed, float accel, int interval, float duration, float delay)
{
int count = startAngle;
int angle = Math.Abs(endAngle - startAngle);
float wait = duration / (float)angle;
if ( endAngle > startAngle )
{
while (count < endAngle)
{
mScene.AddBullet(new GameBullet(isOwn, position, Helper.GetSpeedWithAngle(count, speed), Helper.GetSpeedWithAngle(count, accel), type, color, (count - startAngle) * wait + delay ));
count += interval;
}
}
else
{
while (count > endAngle)
{
mScene.AddBullet(new GameBullet(isOwn, position, Helper.GetSpeedWithAngle(count, speed), Helper.GetSpeedWithAngle(count, accel), type, color, (startAngle - count) * wait + delay ));
count += interval;
}
}
}
/// <summary>
/// 直线交叉弹幕
/// </summary>
/// <param name="isOwn">是否为玩家子弹</param>
/// <param name="type">子弹类型</param>
/// <param name="color">子弹颜色</param>
/// <param name="spawnCount">子弹数量</param>
/// <param name="beginPos1">开始地点一</param>
/// <param name="beginPos2">开始地点二</param>
/// <param name="crossPos">交叉点</param>
/// <param name="speed">子弹移动速度</param>
/// <param name="accel">子弹移动加速度</param>
/// <param name="duration">发射持续时间（为0表示瞬间发射所有）</param>
/// <param name="delay">延迟发射时间</param>
public void CreateCrossLine(bool isOwn, int type, int color, int spawnCount, Vector2 beginPos1, Vector2 beginPos2, Vector2 crossPos, float speed, float accel, float duration, float delay)
{
int count = 0;
float wait = duration / (float)spawnCount;
while (count < spawnCount)
{
mScene.AddBullet(new GameBullet(isOwn, beginPos1,
Helper.GetSpeedWithPosition(beginPos1, crossPos, speed), Helper.GetSpeedWithPosition(beginPos1, crossPos, accel),
type, color,
wait * count + delay));
mScene.AddBullet(new GameBullet(isOwn, beginPos2,
Helper.GetSpeedWithPosition(beginPos2, crossPos, speed), Helper.GetSpeedWithPosition(beginPos2, crossPos, accel),
type, color,
wait * count + delay));
count++;
}
}
/// <summary>
/// 直线弹幕
/// </summary>
/// <param name="isOwn">是否为玩家子弹</param>
/// <param name="type">子弹类型</param>
/// <param name="color">子弹颜色</param>
/// <param name="spawnCount">子弹数量</param>
/// <param name="startPos">开始地点</param>
/// <param name="targetPos">目标地点（用于确定方向而已）</param>
/// <param name="speed">子弹移动速度</param>
/// <param name="accel">子弹移动加速度</param>
/// <param name="duration">发射持续时间</param>
/// <param name="delay">延迟发射时间</param>
public void CreateLine(bool isOwn, int type, int color, int spawnCount, Vector2 startPos, Vector2 targetPos, float speed, float accel, float duration, float delay)
{
int count = 0;
float wait = duration / (float)spawnCount;
while (count < spawnCount)
{
mScene.AddBullet(new GameBullet(isOwn, startPos,
Helper.GetSpeedWithPosition(startPos, targetPos, speed), Helper.GetSpeedWithPosition(startPos, targetPos, accel),
type, color,
wait * count + delay));
count++;
}
}
/// <summary>
/// 随机弹幕
/// </summary>
/// <param name="isOwn">是否为玩家子弹</param>
/// <param name="type">子弹类型</param>
/// <param name="color">子弹颜色</param>
/// <param name="spawnCount">子弹数量</param>
/// <param name="boundary">子弹范围</param>
/// <param name="speed">子弹速度（包括方向）</param>
/// <param name="accel">子弹加速度（包括方向）</param>
/// <param name="duration">发射持续时间（为0表示瞬间发射所有）</param>
/// <param name="delay">延迟发射时间</param>
public void CreateRandom(bool isOwn, int type, int color, int spawnCount, RangeBox boundary, RangeVector speed, RangeVector accel, float duration, float delay)
{
int count = 0;
float wait = duration / (float)spawnCount;
while (count < spawnCount)
{
Vector2 sp = speed.Get();
Vector2 dir = sp;
dir.Normalize();
mScene.AddBullet(new GameBullet(isOwn, boundary.Get(), sp, dir * accel.Get(), type, color, count * wait + delay));
count++;
}
}
}
就来圆形弹幕来讲解吧。
首先大家可以看看前面GameBullet，有个字段是用于延迟显示的（就是说子弹已经添加了，只是必须要等到规定时间过去才能显示出来）
解析来看具体的实现
public void CreateCircle(bool isOwn, int type, int color, Vector2 position, float speed, float accel, int interval, float delay)
{
int angle = 0;
while (angle < 360)
{
mScene.AddBullet(new GameBullet(isOwn, position, Helper.GetSpeedWithAngle(angle, speed), Helper.GetSpeedWithAngle(angle, accel), type, color, delay));
angle += interval;
}
}
核心思想就是通过“极坐标公式”算出不同角度对应的坐标，然后生成子弹
具体的计算就是Helper.GetSpeedWithAngle，这个忘记的可以看前面章节，有写~
通过累加angle，循环360°，然后计算出不同角度的速度方向和延迟就能创建圆形弹幕了
再来一个用的最多的扇形弹幕
public void CreateRotateAndShoot(bool isOwn, int type, int color, Vector2 position, int startAngle, int endAngle, float speed, float accel, int interval, float duration, float delay)
{
int count = startAngle;
int angle = Math.Abs(endAngle - startAngle);
float wait = duration / (float)angle;
if ( endAngle > startAngle )
{
while (count < endAngle)
{
mScene.AddBullet(new GameBullet(isOwn, position, Helper.GetSpeedWithAngle(count, speed), Helper.GetSpeedWithAngle(count, accel), type, color, (count - startAngle) * wait + delay ));
count += interval;
}
}
else
{
while (count > endAngle)
{
mScene.AddBullet(new GameBullet(isOwn, position, Helper.GetSpeedWithAngle(count, speed), Helper.GetSpeedWithAngle(count, accel), type, color, (startAngle - count) * wait + delay ));
count += interval;
}
}
}
原理和上面类似，只是需要注意的是时间延迟传递的是 (startAngle-Count)*wait+delay
其实就是通过计算出需要产生的子弹数量已经总的延迟，然后算出每一个子弹的延迟时间。
这样的效果就是，瞬间产生了一堆子弹，但是看到的是一个个显示出来，有一种旋转着发射子弹的感觉。。。表达不好。。
有了这个东西，就可以看看 BOSS弹幕的生成了，其实就是用了这些函数而已
public static class BossBarrage
{
/// <summary>
/// 花瓣型弹幕
/// </summary>
/// <param name="barrage"></param>
/// <param name="position"></param>
/// <returns>弹幕持续8秒</returns>
public static int Petal(GameBarrage barrage, Vector2 position)
{
barrage.CreateRotateAndShoot(false, 0, 0, position, 0, 300, 300, -350, 5, 8, 0);
barrage.CreateRotateAndShoot(false, 0, 0, position, 30, 330, 300, -350, 5, 8, 0);
barrage.CreateRotateAndShoot(false, 0, 0, position, 60, 360, 300, -350, 5, 8, 0);
barrage.CreateRotateAndShoot(false, 0, 0, position, 90, 390, 300, -350, 5, 8, 0);
barrage.CreateRotateAndShoot(false, 0, 0, position, 120, 420, 300, -350, 5, 8, 0);
barrage.CreateRotateAndShoot(false, 0, 0, position, 150, 450, 300, -350, 5, 8, 0);
barrage.CreateRotateAndShoot(false, 0, 0, position, 180, 480, 300, -350, 5, 8, 0);
barrage.CreateRotateAndShoot(false, 0, 0, position, 210, 510, 300, -350, 5, 8, 0);
barrage.CreateRotateAndShoot(false, 0, 0, position, 240, 540, 300, -350, 5, 8, 0);
barrage.CreateRotateAndShoot(false, 0, 0, position, 270, 570, 300, -350, 5, 8, 0);
barrage.CreateRotateAndShoot(false, 0, 0, position, 300, 600, 300, -350, 5, 8, 0);
barrage.CreateRotateAndShoot(false, 0, 0, position, 330, 630, 300, -350, 5, 8, 0);
return 8;
}
/// <summary>
/// 直线型弹幕
/// </summary>
/// <param name="barrage"></param>
/// <returns>弹幕持续5秒</returns>
public static int Line(GameBarrage barrage)
{
barrage.CreateLine(false, 0, 0, 50, new Vector2(25, 0), new Vector2(25, 400), 100, 0, 15, 0);
barrage.CreateLine(false, 0, 1, 50, new Vector2(75, 0), new Vector2(75, 400), 100, 0, 15, 0);
barrage.CreateLine(false, 0, 2, 50, new Vector2(125, 0), new Vector2(125, 400), 100, 0, 15, 0);
barrage.CreateLine(false, 0, 3, 50, new Vector2(175, 0), new Vector2(175, 400), 100, 0, 15, 0);
barrage.CreateLine(false, 0, 4, 50, new Vector2(225, 0), new Vector2(225, 400), 100, 0, 15, 0);
barrage.CreateLine(false, 0, 5, 50, new Vector2(275, 0), new Vector2(275, 400), 100, 0, 15, 0);
barrage.CreateLine(false, 0, 6, 50, new Vector2(325, 0), new Vector2(325, 400), 100, 0, 15, 0);
barrage.CreateLine(false, 0, 0, 50, new Vector2(375, 0), new Vector2(375, 400), 100, 0, 15, 0);
return 5;
}
/// <summary>
/// 连续两拨错开的扇形弹幕
/// </summary>
/// <param name="barrage"></param>
/// <param name="position"></param>
/// <returns>弹幕持续时间2秒</returns>
public static int TwoFans(GameBarrage barrage, Vector2 position)
{
barrage.CreateRotateAndShoot(false, 0, 0, position, 45, 135, 300, 0, 5, 0, 0);
barrage.CreateRotateAndShoot(false, 0, 0, position, 43, 143, 300, 0, 5, 0, 0.1f);
return 2;
}
/// <summary>
/// 左右两边出现相反的漩涡型弹幕
/// </summary>
/// <param name="barrage"></param>
/// <param name="position"></param>
/// <returns>弹幕持续时间4秒</returns>
public static int TwoReverseRotate(GameBarrage barrage, Vector2 position)
{
barrage.CreateRotateAndShoot(false, 2, 0, new Vector2(50, position.Y), 0, 180, 350, -80, 8, 1, 0);
barrage.CreateRotateAndShoot(false, 2, 4, new Vector2(50, position.Y), 90, 270, 350, -80, 8, 1, 0);
barrage.CreateRotateAndShoot(false, 2, 0, new Vector2(50, position.Y), 180, 360, 350, -80, 8, 1, 0);
barrage.CreateRotateAndShoot(false, 2, 4, new Vector2(50, position.Y), 270, 450, 350, -80, 8, 1, 0);
barrage.CreateRotateAndShoot(false, 2, 0, new Vector2(350, position.Y), 180, 0, 350, -80, -8, 1, 0);
barrage.CreateRotateAndShoot(false, 2, 4, new Vector2(350, position.Y), 270, 90, 350, -80, -8, 1, 0);
barrage.CreateRotateAndShoot(false, 2, 0, new Vector2(350, position.Y), 360, 180, 350, -80, -8, 1, 0);
barrage.CreateRotateAndShoot(false, 2, 4, new Vector2(350, position.Y), 450, 270, 350, -80, -8, 1, 0);
return 4;
}
/// <summary>
/// 三个园型弹幕
/// </summary>
/// <param name="barrage"></param>
/// <param name="position"></param>
/// <returns>弹幕持续时间5秒</returns>
public static int ThreeCircle(GameBarrage barrage, Vector2 position)
{
barrage.CreateCircle(false, 0, 0, position, 250, 0, 10, 0);
barrage.CreateCircle(false, 0, 1, position + new Vector2(-100, 50), 250, 0, 10, 0);
barrage.CreateCircle(false, 0, 2, position + new Vector2(100, 50), 250, 0, 10, 0);
barrage.CreateCircle(false, 0, 3, position, 250, 0, 10, 0.5f);
barrage.CreateCircle(false, 0, 4, position + new Vector2(-100, 50), 250, 0, 10, 0.5f);
barrage.CreateCircle(false, 0, 5, position + new Vector2(100, 50), 250, 0, 10, 0.5f);
return 5;
}
}
代码很多，只是通过一些数学计算，产生不同效果而已大家可以自由发挥
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