与 () 的间距 `與 [角色 v] 的間距` 类别 侦测类积木 形状 椭圆形积木

The Distance to () 积木 is a 侦测类积木 and a 椭圆形积木. The block reports the 距离 (a measurement of pixels) between it and a specified 角色造型中心点, or the 鼠标游标.

## 用法示例

As this block can give distances between objects, it is very useful in 专案 that require a great deal of careful sensing and movement.

Some common uses for the Distance to () block:

• Estimating when collisions will occur
```如果 <(與 [snowball v] 的間距) < (40)> 那麼
說出 [Watch out!]
等待直到 <碰到 [snowball v] ?>
說出 [] // stop saying the message
end
```
• Helping determine how long it should take a sprite to move somewhere, judging from the distance
```變數 [movements v] 設為 ([ceiling v] 數值 ((與 [meteor v] 的間距) / (10))) // "movements" being the amount of 10 pixel motions to reach the meteor
```
• Determining how far a rocket should fire
```變數 [real distance v] 設為 (字串組合 ((與 [asteroid v] 的間距) * (10000)) 和 [ kilometers]) // for relating pixel distance to real life
```

## 应用

Main article: List of Block Workarounds

This block can be replicated with the following code:

```([sqrt v] 數值 ((((x座標) - ([x座標 v] \( [Wanted Sprite v] \))) * ((x座標) - ([x座標 v] \( [Wanted Sprite v] \)))) + (((y 座標) - ([y 座標 v] \( [Wanted Sprite v] \))) * ((y 座標) - ([y 座標 v] \( [Wanted Sprite v] \))))))
```

## Related Suggestion

Some Scratchers want a block that gives the distance to any location, not just a 角色.[1] It would be like this:

`(distance to x: () y: ())//category=sensing`

It is technically unnecessary because it can be replicated with a similar [[Eng:#Workaround|workaround]]:

```([sqrt v] 數值 ((((x座標) - (wanted x)) * ((x座標) - (wanted x))) + (((y 座標) - (wanted y)) * ((y 座標) - (wanted y)))))
```

## 参考

Cookies help us deliver our services. By using our services, you agree to our use of cookies.