public TileEntity GetBuildingAtScreenPoint(Vector3 screenPoint)
{
int mx, my;
if (IsoHelper.ScreenPositionToGrid(screenPoint, out mx, out my))
{
return(GetAnyBuildingEntity(mx, my));
}
return(null);
}
protected override void OnPan(Vector2 screenPosition, Vector3 deltaPosition)
{
isPanned = true;
if (isDragging)
{
int mx, my;
IsoHelper.ScreenPositionToGrid(screenPosition, out mx, out my);//REMARK 忽略边界检查,允许多拽出边界
DraggingBuildingTo(mx - dragDeltaX, my - dragDeltaY);
}
else
{
base.OnPan(screenPosition, deltaPosition);
}
}
private void CheckDragBuilding(Vector2 screenPosition)
{
int mx, my;
IsoHelper.ScreenPositionToGrid(screenPosition, out mx, out my);//REMARK 忽略边界检查
int dx = mx - currentBuilding.GetTilePos().x;
int dy = my - currentBuilding.GetTilePos().y;
if (dx >= 0 && dx < currentBuilding.width && dy >= 0 && dy < currentBuilding.height)
{
dragDeltaX = dx;
dragDeltaY = dy;
isDragging = true;
}
}
//suggest a building position
private TilePoint SuggestPosition(TilePoint?suggestPoint = null)
{
Queue <TilePoint> notVisited = new Queue <TilePoint>();
bool[,] visitedMap = new bool[Constants.WIDTH, Constants.HEIGHT];
visitedMap.Initialize();
int centerX, centerY;
if (suggestPoint == null)
{
if (lastPoint != null)
{
var viewportPoint =
Camera.main.WorldToViewportPoint(new Vector3(lastPoint.Value.x, 0, lastPoint.Value.y));
Debug.Log(viewportPoint);
if (viewportPoint.x > 0.2f && viewportPoint.x < 0.8f && viewportPoint.y > 0.2f && viewportPoint.y < 0.8f)
{
suggestPoint = lastPoint.Value;
}
}
if (suggestPoint == null)
{
var cameraCenter = Camera.main.ViewportToScreenPoint(new Vector3(0.5f, 0.5f));
IsoHelper.ScreenPositionToGrid(cameraCenter, out centerX, out centerY);
suggestPoint = new TilePoint(centerX, centerY);
}
}
centerX = suggestPoint.Value.x;
centerY = suggestPoint.Value.y;
//REMARK 一个建筑格子占2个小格子
if (centerX % 2 == 1)
{
centerX += 1;
}
if (centerY % 2 == 1)
{
centerY += 1;
}
int STEP = 2;
visitedMap[centerX, centerY] = true;
notVisited.Enqueue(new TilePoint(centerX, centerY));
int x, y;
while (notVisited.Count > 0)
{
var point = notVisited.Dequeue();
x = point.x;
y = point.y;
if (IsoMap.Instance.CanPlaceBuilding(x, y, currentBuilding.width, currentBuilding.height))
{
return(new TilePoint(x, y));
}
int dx = Mathf.Abs(x - centerX);
int dy = Mathf.Abs(y - centerY);
if (dx > currentBuilding.width || dy > currentBuilding.height)//建议的点不能离中心太远
{
continue;
}
if (x - STEP >= 0 && !visitedMap[x - STEP, y])
{
visitedMap[x - STEP, y] = true;
notVisited.Enqueue(new TilePoint(x - STEP, y));
}
if (x + STEP < Constants.WIDTH && !visitedMap[x + STEP, y])
{
visitedMap[x + STEP, y] = true;
notVisited.Enqueue(new TilePoint(x + STEP, y));
}
if (y - STEP >= 0 && !visitedMap[x, y - STEP])
{
visitedMap[x, y - STEP] = true;
notVisited.Enqueue(new TilePoint(x, y - STEP));
}
if (y + STEP < Constants.HEIGHT && !visitedMap[x, y + STEP])
{
visitedMap[x, y + STEP] = true;
notVisited.Enqueue(new TilePoint(x, y + STEP));
}
}
//no best point,use center of screen
return(new TilePoint(centerX, centerY));
}
