
Skylancer4 |

You can charge 360, but you have to go in a "straight line." Given the grid, that allows you to go in diagonals as well. Easiest way to figure it out would be use a ruler or string and go from the center of the start square to the center of the end square. If any of the squares in between them has an opponent or is otherwise not 'valid' the charge is blocked.

setzer9999 |
Wait... I was including diagonals as part of my "cardinal directions" assessment. I've seen people talking about this on posts before, but I just don't see a definitive post yet...
Are you saying that you can only go in straight grid lines and diagonal grid lines? I'm confused, because right before saying that, you said you can go 360 degrees (as in reality), but then you specified that you can't go 360 degrees...

mdt |

One way to do it is to use a one inch wide ruler, you can find these in stores (I've actually scene one in a game store with squares on it). Then put the ruler down on the straight line to the target. Move him along it. If anyone threatens at least half a square he's moving through, then he's leaving a threatened square and provokes an AoO.

Skylancer4 |

On the grid, a line can seem "jagged" depending on the path so yes the line effects of the spells are a good place to look if you don't understand the grid completely. If that is the case, the best suggestion I can give is use the ruler edge/string as I stated above. When moving avoid don't use the diagonal movement, instead move through every square the string goes through, each counting as 5' (unless it is difficult terrain or contains another creature in which case you cannot charge without other abilities). If any of those squares of movement go through a threatened area, that creature gets an attack of opportunity on you.