bool GameEntity::HitTest(GameEntity & ge)
{
if(shapeType==S_Circle)
{
if(ge.GetShape()==S_Circle)
{
return HitTestCircles(GetCircle(),ge.GetCircle());
}
else if(ge.GetShape()==S_Box)
{
//这个暂时没做
return false;
}
else if(ge.GetShape()==S_Beam)
{
return HitTestBeamCircle(ge.GetBeam(),circle);
}
}
else if(shapeType==S_Box)
{
if(ge.GetShape()==S_Circle)
{
//这个暂时没做 circle box
return false;
}
else if(ge.GetShape()==S_Box)
{
//这个暂时没做 box box
return false;
}
else if(ge.GetShape()==S_Beam)
{
return HitTestBeamBox(ge.GetBeam(),box);
}
}
else if(shapeType==S_Beam)
{
if(ge.GetShape()==S_Circle)
{
//beam circle
return HitTestBeamCircle(beam,ge.GetCircle());
}
else if(ge.GetShape()==S_Box)
{
return HitTestBeamBox(beam,ge.GetBox());
}
else if(ge.GetShape()==S_Beam)
{
//这个暂时没做 beam beam
return false;
}
}
return false;
}
void GameEntity::MomentumHit(GameEntity &g1,GameEntity &g2)
{
//只适用于两个圆
//参考flash
//确定已经碰撞后
double vx1,vy1,vr1;
double vx2,vy2,vr2;
//2014-3-15
double vx1o,vy1o,vr1o;
double vx2o,vy2o,vr2o;
g1.GetVelocity(vx1o,vy1o,vr1o);
g2.GetVelocity(vx2o,vy2o,vr2o);
//用于粗暴调整位置
g1.GetVelocity(vx1,vy1,vr1);
g2.GetVelocity(vx2,vy2,vr2);
double r1=g1.GetCircle().r,r2=g2.GetCircle().r;
double dx=g2.GetCircle().x-g1.GetCircle().x;
double dy=g2.GetCircle().y-g1.GetCircle().y;
double dist=sqrt(dx*dx+dy*dy);
double angle=atan2(dy,dx);
double s=sin(angle);
double c=cos(angle);
Point pos1;
pos1.x=0;
pos1.y=0;
//g2变成g1坐标系
Point pos2=myRotate(dx,dy,s,c,true);
//g1速度调整
Point vel1=myRotate(vx1,vy1,s,c,true);
//g2速度调整
Point vel2=myRotate(vx2,vy2,s,c,true);
//这样只有vx起作用，vy法向速度不用考虑
//碰撞反应
double vxTotal=vel1.x-vel2.x;
//考虑质量的做法
//vel1.x=((mass1-mass2)*vel1.x+2*mass2*vel2.x)/(mass1+mass2);
//vel2.x=vxTotal+vel1.x;
//我质量都相等
vel1.x=vel2.x;
vel2.x=vxTotal+vel1.x;
//更新位置，防止吸住
//3_11,防除数为零
double absV=abs(vel1.x)+abs(vel2.x);
if(absV==0)
{
double overlap=(r1+r2)-abs(pos1.x-pos2.x); //如果我所有Robot（Bullet不发生动量碰撞）半径都一样又可简化
double tmp=pos1.x>pos2.x ? 1 : -1;
pos1.x+=tmp*overlap;
pos2.x+=-tmp*overlap;
}
else
{
double overlap=(r1+r2)-abs(pos1.x-pos2.x); //如果我所有Robot（Bullet不发生动量碰撞）半径都一样又可简化
pos1.x+=vel1.x/absV*overlap;
pos2.x+=vel2.x/absV*overlap;
}
//旋转回去
Point pos1F=myRotate(pos1.x,pos1.y,s,c,false);
Point pos2F=myRotate(pos2.x,pos2.y,s,c,false);
/*
//调整到屏幕坐标系
g2.SetX(g1.GetCircle().x+pos2F.x);
g2.SetY(g1.GetCircle().y+pos2F.y);
g1.SetX(g1.GetCircle().x+pos1F.x);
g1.SetY(g1.GetCircle().y+pos1F.y);
*/
//把速度旋转回去
Point vel1F=myRotate(vel1.x,vel1.y,s,c,false);
Point vel2F=myRotate(vel2.x,vel2.y,s,c,false);
//2014-3-15粗暴调整位置
g2.SetX(g2.GetCircle().x-vx2o);
g2.SetY(g2.GetCircle().y-vy2o);
g1.SetX(g1.GetCircle().x-vx1o);
g1.SetY(g1.GetCircle().y-vy1o);
/*
//20150509
Vector2D g1_pos(g1.circle.x,g1.circle.y);
Vector2D g2_pos(g2.circle.x,g2.circle.y);
Vector2D g1_to_g2(g2_pos - g1_pos);
//double mov_length = (g1_to_g2.Length() - (g1.circle.r + g2.circle.r) ) / 2;
g1_to_g2.Normalize();
g1_pos -= 3 * g1_to_g2;
g2_pos += 3 * g1_to_g2;
g2.SetX(g2_pos.x);
g2.SetY(g2_pos.y);
g1.SetX(g1_pos.x);
g1.SetY(g1_pos.y);
*/
//这里直接设定vx,vy会有问题(对蜘蛛和毁灭者)
//因为操纵vxvy时是直接设定值而非叠加
g1.SetVX(vel1F.x);
g1.SetVY(vel1F.y);
g2.SetVX(vel2F.x);
g2.SetVY(vel2F.y);
}
void GameEntity::MomentumHit_Half(GameEntity &g1,GameEntity &g2)
{
//只适用于两个圆
//g2固定物体,只要反一下相对坐标系中g1的速度
//参考flash
//确定已经碰撞后
double vx1,vy1,vr1;
g1.GetVelocity(vx1,vy1,vr1);
double r1=g1.GetCircle().r,r2=g2.GetCircle().r;
double dx=g2.GetCircle().x-g1.GetCircle().x;
double dy=g2.GetCircle().y-g1.GetCircle().y;
double dist=sqrt(dx*dx+dy*dy);
double angle=atan2(dy,dx);
double s=sin(angle);
double c=cos(angle);
Point pos1;
pos1.x=0;
pos1.y=0;
//g2变成g1坐标系
Point pos2=myRotate(dx,dy,s,c,true);
//g1速度调整
Point vel1=myRotate(vx1,vy1,s,c,true);
//这样只有vx起作用，vy法向速度不用考虑
//我质量都相等
vel1.x=-vel1.x;
/*
//更新位置，防止吸住
double absV=abs(vel1.x);
double overlap=(r1+r2)-abs(pos1.x-pos2.x); //如果我所有Robot（Bullet不发生动量碰撞）半径都一样又可简化
pos1.x+=vel1.x/absV*overlap;
*/
double tmp=vel1.x>0 ? 1 : -1; //防vel1.x=0的情况
double overlap=(r1+r2)-abs(pos1.x-pos2.x);
pos1.x+=tmp*overlap;
//旋转回去
Point pos1F=myRotate(pos1.x,pos1.y,s,c,false);
//调整到屏幕坐标系
g1.SetX(g1.GetCircle().x+pos1F.x);
g1.SetY(g1.GetCircle().y+pos1F.y);
//把速度旋转回去
Point vel1F=myRotate(vel1.x,vel1.y,s,c,false);
g1.SetVX(vel1F.x);
g1.SetVY(vel1F.y);
}
