public bool PerformCollisionAgainst(AnimatedSpriteEntity entity)
{
bool didCollisionOccur = false;
int leftIndex;
int rightIndex;
GetIndicesBetween(
entity.BoundingBoxWorld.LowerLeft.X, entity.BoundingBoxWorld.UpperRight.X, out leftIndex, out rightIndex);
var boundingBoxWorld = entity.BoundingBoxWorld;
for (int i = leftIndex; i < rightIndex; i++)
{
var separatingVector = GetSeparatingVector(boundingBoxWorld, collisions [i]);
if (separatingVector != CCVector2.Zero)
{
entity.PositionX += separatingVector.X;
entity.PositionY += separatingVector.Y;
// refresh boundingBoxWorld:
boundingBoxWorld = entity.BoundingBoxWorld;
didCollisionOccur = true;
}
}
return(didCollisionOccur);
}
public bool PerformCollisionAgainst(AnimatedSpriteEntity entity)
{
bool didCollisionOccur = false;
int leftIndex;
int rightIndex;
//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.BoundingBoxWorld.LowerLeft.X, entity.BoundingBoxWorld.UpperRight.X, out leftIndex, out rightIndex);
var boundingBoxWorld = entity.BoundingBoxWorld;
//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
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
if (separatingVector != CCVector2.Zero)
{
//更新entity的位置
entity.PositionX += separatingVector.X;
entity.PositionY += separatingVector.Y;
// refresh boundingBoxWorld:
boundingBoxWorld = entity.BoundingBoxWorld;
didCollisionOccur = true;
}
}
//相碰
return didCollisionOccur;
}
public bool PerformCollisionAgainst(AnimatedSpriteEntity entity)
{
bool didCollisionOccur = false;
int leftIndex;
int rightIndex;
GetIndicesBetween (
entity.BoundingBoxWorld.LowerLeft.X, entity.BoundingBoxWorld.UpperRight.X, out leftIndex, out rightIndex);
var boundingBoxWorld = entity.BoundingBoxWorld;
for (int i = leftIndex; i < rightIndex; i++)
{
var separatingVector = GetSeparatingVector (boundingBoxWorld, collisions [i]);
if (separatingVector != CCVector2.Zero)
{
entity.PositionX += separatingVector.X;
entity.PositionY += separatingVector.Y;
// refresh boundingBoxWorld:
boundingBoxWorld = entity.BoundingBoxWorld;
didCollisionOccur = true;
}
}
return didCollisionOccur;
}
public bool Intersects(AnimatedSpriteEntity other)
{
//返回是否两个entity的rect有重叠
return this.sprite.BoundingBoxTransformedToWorld.IntersectsRect (other.sprite.BoundingBoxTransformedToWorld);
}
public bool Intersects(AnimatedSpriteEntity other)
{
return(this.sprite.BoundingBoxTransformedToWorld.IntersectsRect(other.sprite.BoundingBoxTransformedToWorld));
}