自订积木 :: custom
() is a custom 积木, or procedure, all of which are 条形积木 in the 更多积木 palette. A version of it is created for every custom block, much like with the 变数积木. Custom blocks are usually used to make long or frequently repeated scripts in projects accessible in a single block.
A procedure is created by clicking "Make a block" in the 更多积木 palette. This creates a dialogue, where the block can be named, and 参数 defined. (These can be edited via the context menu.) Clicking OK will create a 定义 () block with the procedure inside. Blocks can then be stacked beneath it. When the procedure is run, it will run the blocks under the Define hat.
定義 jump 重複 (20) 次 y 改變 (1) // upward motion end 重複 (20) 次 y 改變 (-1) // downward motion end
當 @greenflag 被點擊 下筆 重複 (40) 次 draw :: custom end 定義 draw 重複 (4) 次 變數 [i v] 改變 (0.2) 移動 ((i) * (5)) 點 右轉 @turnright ((120) + ((i) / (20))) 度 筆跡顏色設為 (i) 筆跡亮度設為 (i) end
- Making a sprite visually pointing in direction "A" but moving in direction "B"
define point in direction (A) move direction (B) point in direction (B) //since the procedure is atomic, this will go unseen move (3) steps //motion is in the correct direction point in direction (A)
An example use of booleans in custom blocks.
- When Boolean in true, script activates if the block is put in a forever loop
定義 say (string) when <boolean> 如果 <boolean> 那麼 說出 (string) end
- Main article: List of Block Workarounds
廣播訊息 [procedure v] 並等待 當收到訊息 [procedure v] 移動 (10) 點
This can still be done in Scratch 2.0. 背景 events can also be used.
This is not a perfect workaround, as procedures are recursive, while 广播 are just tail-recursive. Furthermore, broadcast scripts cannot run without screen refresh, which is one benefit of using custom blocks. Inputs, while possible, require separate 变量s.
It is possible to insert inputs other than numbers, strings, and booleans in custom blocks.
Blocks with boolean inputs will not respond to changes in the boolean's state.
Using the "Run without screen refresh" option may cause audible errors in sounds.