public TouchScreenInput(CCLayer Owner,PhysicsEntity controledEntity)
{
this.owner = Owner;
mControledEntity = controledEntity;
touchListener = new CCEventListenerTouchAllAtOnce ();
touchListener.OnTouchesMoved = HandleTouchesMoved;
touchListener.OnTouchesEnded = OnTouchesEnded;
owner.AddEventListener (touchListener);
}
public void PerformCollisionAgainst(PhysicsEntity entity, out CCTileMapCoordinates tileAtXy, out bool didCollisionOccur)
{
didCollisionOccur = false;
tileAtXy = CCTileMapCoordinates.Zero;
int leftIndex;
int rightIndex;
int directionCount = 0;
//entity是player/enemy
//boundiongBox是包裹entity的最小的矩形
//lowerLeft是左下角，UpperRight是右上角
//得到的leftIndex和rightIndex应该是和entity有接触的瓦片地图的实体瓦片的list
//例如，如果entity在地面上，则这个list里面应该只有和entity接触的地面瓦片
//然后进一步判断这个地面瓦片对于entity的作用（地面就是支持entity）
GetIndicesBetween (entity.LeftX, entity.RightX, out leftIndex, out rightIndex);
var boundingBoxWorld = entity.BoundingBoxTransformedToWorld;
//遍历所有和entity有接触的瓦片，来判断这些瓦片对于entity的物理作用
for (int i = leftIndex; i < rightIndex; i++)
{
//计算得到这个瓦片和entity接触后对entity的作用力产生的运动vector
//把ball从砖块里弹出来
var separatingVector = GetSeparatingVector (boundingBoxWorld, collisions [i]);
//如果player和瓦片地图中的不可进入的瓦片相碰
for (directionCount = 0; directionCount < 4; directionCount++)
{
if (separatingVector[directionCount] != CCVector2.Zero)
{
//更新entity的位置
entity.PositionX += separatingVector[directionCount].X;
entity.PositionY += separatingVector[directionCount].Y;
// refresh boundingBoxWorld:
boundingBoxWorld = entity.BoundingBoxTransformedToWorld;
didCollisionOccur = true;
tileAtXy = collisions [i].tiledMapCoordinate;
}
}
}
}
public bool Intersects(PhysicsEntity other)
{
return this.sprite.BoundingBoxTransformedToWorld.IntersectsRect (other.sprite.BoundingBoxTransformedToWorld);
}