我想问一下，游戏中法术的射程是怎么计算的？

wiki哟
Range[edit]
The range of a beam wand is 6 to 13 squares.[4] For each monster hit range decreases 3.[5] For each square objects are affected range decreases 1.[6] Beams don't bounce and can't be reflected.
The range of a ray wand is 7 to 13 squares.[7] For each monster hit range decreases 2.[8] If fire passes over water or a fountain, or cold passes over water or lava, range may decrease 1, 3, or the ray may stop entirely. If fire passes over scrolls or spellbooks, some may burn, but range isn't decreased.[9] Each time it bounces off a wall range decreases by 1.[10] Reflection off a monster or you reverses the direction of travel, but range doesn't decrease.[11]