From Test-Scratch-Wiki
| Distance to () | |
.png){kind=small}
| |
| Category | Sensing |
| Type | Reporter |
The Distance to () block is a Sensing block and a Reporter block. The block reports the distance (a measurement of pixels) between it and a specified sprite's costume center, or the mouse-pointer.
Example Uses
As this block can give distances between objects, it is very useful in projects that require a great deal of careful sensing and movement.
Some common uses for the Distance to () block:
- Estimating when collisions will occur
if <(distance to [snowball v]) < (40)> then say [Watch out!] wait until <touching [snowball v]?> say [] //stop saying the message
- Helping determine how long it should take a sprite to move somewhere, judging from the distance
set [movements v] to ([ceiling v] of ((distance to [meteor v]) / (10))) //"movements" being the amount of 10 pixel motions to reach the meteor
- Determining how far a rocket should fire
set [real distance v] to (join ((distance to [asteroid v]) * (10000)) [ kilometers]) //for relating pixel distance to real life
Workaround
- Main article: List of Block Workarounds
This block can be replicated with the following code:
([sqrt v] of ((((x position) - ([x position v] of [Wanted Sprite v])) * ((x position) - ([x position v] of [Wanted Sprite v]))) + (((y position) - ([y position v] of [Wanted Sprite v])) *((y position) - ([y position v] of [Wanted Sprite v])))))
Related Suggestion
Some Scratchers want a block that gives the distance to any location, not just a sprite.[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] of ((((x position) - (wanted x)) * ((x position) - (wanted x))) + (((y position) - (wanted y)) * ((y position) - (wanted y)))))
See Also
