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Bullet.as
140 lines (140 loc) · 4.15 KB
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Bullet.as
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class Bullet extends MovieClip {
public var speed:Number; //移动速度
public var direction:Number; //移动方向（并不是朝向）
public var exists:Number; //从出现时开始计算的时间（子弹内部时间戳）
public var type:Number; //类型（对应行动规律）
public var ken:MovieClip; //判定核心（该区域与自机重合才会导致MISS）
public var rotated:Boolean; //若为是，子弹改变方向时朝向会随之变化
public var noVanish:Boolean; //若为是，则不会因碰触边界消失
//常数
static var RIGHTSIDE = 1;
static var BOTTOMSIDE = 2;
static var LEFTSIDE = 4;
static var TOPSIDE = 8;
static var LR_SIDE = RIGHTSIDE|LEFTSIDE;
static var TB_SIDE = BOTTOMSIDE|TOPSIDE;
static var ALL_SIDE = LR_SIDE|TB_SIDE;
public function Bullet() {
rotated = true;
noVanish = false;
type = 0;
exists = 0;
}
public function initial() {
if(rotated)
_rotation = direction;
onEnterFrame = function () {
exists++;
if (!noVanish && (this._x<-80 || this._y<-80 || this._x>Stage.width+80 || this._y>Stage.height+80 )){
removeMovieClip(this);
}
if(_root.boss.condition != Entity.COND_COMBAT){
removeMovieClip(this);
}
if (_root.player && !_root.player.invincible && ken.hitTest(_root.player._x, _root.player._y, true)) {
_root.player.removeMovieClip();
_root.failRecover = 200;
}
moveMode(type);
};
}
private function normalMove():Void {
//直线运动
var cos = Math.cos(direction/180*Math.PI);
var sin = Math.sin(direction/180*Math.PI);
if(rotated)
_rotation = direction;
_x += speed*cos;
_y += speed*sin;
}
private function gravityMove(para:Number):Void {
//重力运动（抛物线）para越大重力影响越小，para为负时为反重力
var cos = Math.cos(direction/180*Math.PI);
var sin = Math.sin(direction/180*Math.PI);
if(rotated)
_rotation = direction;
_x += speed*cos;
_y += speed*sin+exists/para;
}
private function accelerateMove(para:Number):Void{
//加速运动 para越大加速度越大，para为负时为减速运动直至反向加速
speed += para;
normalMove();
}
private function directReflect(para:Number, dist:Number):Void{
//界面反射判定，para方向参数，dist距离界面边界距离
if((para&RIGHTSIDE) == RIGHTSIDE && _x>=Stage.width-dist && Math.floor((direction+90)/180)%2 == 0)
direction = 180-direction;
if((para&BOTTOMSIDE) == BOTTOMSIDE && _y>=Stage.height-dist && Math.floor((direction)/180)%2 == 0)
direction = -direction;
if((para&LEFTSIDE) == LEFTSIDE && _x<=dist && Math.floor((direction+90)/180)%2 != 0)
direction = 180-direction;
if((para&TOPSIDE) == TOPSIDE && _y<=dist && Math.floor(direction/180)%2 != 0)
direction = -direction;
}
private function trackMove():Void {
//追踪移动
direction = 180+180*Math.atan2(_y-_root.player._y, _x-_root.player._x)/Math.PI;
normalMove();
}
private function rotate(para:Number):Void{
//自身旋转 para为旋转角度，整数为顺时针，适用于激光型或长条形弹幕
direction += para;
_rotation = direction;
}
private function getXY():Array{
//子弹当前坐标
return [_x,_y];
}
private function moveMode(bulletType:Number):Void {
//详细的移动模式
switch (bulletType) {
case 0 :
normalMove();
break;
case 1.11:
if(exists<30){
_x = _root.boss._x;
_y = _root.boss._y-65-exists/3;
}else{
normalMove();
}
directReflect(ALL_SIDE,30);
break;
case 1.12:
normalMove();
if(exists>200)
removeMovieClip(this);
break;
case 1.21:
if(exists<30){
_x = _root.boss._x;
_y = _root.boss._y-65-exists/3;
}else{
accelerateMove(0.2);
}
directReflect(TB_SIDE,30);
break;
case 1.31:
_x = _root.boss._x;
_y = _root.boss._y;
if(exists>=50 && exists<=220){
rotate(1);
}
if(exists>=250){
removeMovieClip(this);
}
break;
case 1.32:
_x = _root.boss._x;
_y = _root.boss._y;
if(exists>=50 && exists<=220){
rotate(-1);
}
if(exists>=250){
removeMovieClip(this);
}
break;
}
}
}