private async Task ActionWalk()
{
float step = 0.2f;
float theta = (float)(random.NextDouble() * 2 * Math.PI);
float yaw = AttachedObject.GetValue(EntityLookComponent.YawProperty);
float head;
EntityWorldPos pos = AttachedObject.GetValue(EntityWorldPositionComponent.EntityWorldPositionProperty);
if (random.Next(50) == 0)
{
head = theta;
}
else
{
head = (float)(yaw / 180.0f * Math.PI);
}
await AttachedObject.SetLocalValue(EntityLookComponent.YawProperty, (float)(head / Math.PI * 180.0f));
await AttachedObject.SetLocalValue(EntityLookComponent.HeadYawProperty, (float)(head / Math.PI * 180.0f));
// 新的位置
EntityWorldPos entityPos = new EntityWorldPos(pos.X - step * (float)Math.Sin(head), pos.Y, pos.Z + step * (float)Math.Cos(head));
BlockWorldPos blockPos = entityPos.ToBlockWorldPos();
// 检测行进方向的方块是否满足要求
Cuboid entityBoundbox = new Cuboid(new Point3d(entityPos.X, entityPos.Y, entityPos.Z), new Size(1, 1, 2)); // TODO data from Boundbox component
var chunkAccessor = AttachedObject.GetComponent <ChunkAccessorComponent>();
bool isCollided = false;
// 检测此位置会不会与方块碰撞
for (int i = 1; blockPos.Y + i < 256 && i <= 3; ++i)
{
BlockWorldPos upblock = BlockWorldPos.Add(blockPos, 0, i, 0);
BlockState upstate = await chunkAccessor.GetBlockState(upblock);
if (upstate.IsMobCollided())
{
Cuboid blockBoundbox = new Cuboid(new Point3d(upblock.X, upblock.Y, upblock.Z), new Size(1, 1, 1));
if (Collision.IsCollided(entityBoundbox, blockBoundbox))
{
isCollided = true;
break;
}
}
}
// 获得高度变化
int yJumpHeight = 0;
bool canWalk = false;
for (int i = 0; blockPos.Y + i >= 0 && i >= -2; --i)
{
BlockState upstate = await chunkAccessor.GetBlockState(BlockWorldPos.Add(blockPos, 0, i + 1, 0));
BlockState state = await chunkAccessor.GetBlockState(BlockWorldPos.Add(blockPos, 0, i, 0));
if (!upstate.IsMobCollided() && state.IsMobCollided() && state.CanMobStand())
{
yJumpHeight = i + 1;
canWalk = true;
break;
}
}
if (!isCollided && canWalk)
{
await AttachedObject.SetLocalValue(
EntityWorldPositionComponent.EntityWorldPositionProperty,
EntityWorldPos.Add(entityPos, 0, yJumpHeight, 0));
}
}