BlockFormEvent

Called when a block is formed or spreads based on world conditions.

Use {@link BlockSpreadEvent} to catch blocks that actually spread and don't

just "randomly" form.

Examples:

Snow forming due to a snow storm.
Ice forming in a snowy Biome like Taiga or Tundra.
Obsidian / Cobblestone forming due to contact with water.
Concrete forming due to mixing of concrete powder and water.

If a Block Form event is cancelled, the block will not be formed.

@see BlockSpreadEvent

当一应条件合适，方块随机生成或开始向四周蔓延时触发。

如欲监听某些方块蔓延的事件，请参见 BlockSpreadEvent 。本事件在方块“随机”生成时触发。

本事件触发的情景包括：

在暴风雪天气下，地面生成雪方块。
在针叶林、雪原等温度较低的生物群系里，水结冰。
岩浆与水接触，生成圆石或黑曜石。
混凝土粉末与水接触，生成混凝土方块。

如果本事件被取消，则不会生成新方块。

@see 参见 BlockSpreadEvent 。