| 05-09-2008, 11:52 PM | #1 |
I'm am trying to get a Vector (facing point A) to pivot to face a point B. Say I have magnitude L, angle of change Theta. Would I do sin(Theta)*L = New Bx Coord sin(90-Theta)*L = New By Coord I tested this under two situations (45 degree turn and -22.5 degree turn) and it worked but I'm not sure if its the right method Heres an image to clarify. ofc it cannot go farther than a 90 degree turn in one step, but why would you? |
| 05-10-2008, 03:11 AM | #2 |
Formula for XY rotation: NewX = Cos(theta)*x + Sin(theta)*y NewY = Cos(theta)*y - Sin(theta)*x Works with any number of degrees. |
| 05-10-2008, 03:16 AM | #3 |
The only foreseeable problem is like you said: rotating >90 degrees. I'm not sure what you're using this for, but I have made a spell where I made a unit rapidly rotate as much as 180 degrees. Just a note about unitfacing, if you make a trigger that relies on the unit's facing angle, it takes the unit a second or so to actually face that way. So if you want the unit to switch directions and immediately do something, use the new angle instead of GetUnitFacing() |
| 05-10-2008, 04:34 PM | #4 |
thanks grim! +rep Im not sure why my way was working but whatever. |