[vJASS] Angle Finding

[Almia]

Is this formula how to find the bouncing angle?
[jass=] private function NormalizeAngle takes real angle returns real
local integer a

if (0 > angle) then
set a = R2I(angle*180/bj_PI - 45)/90*90
else
set a = R2I(angle*180/bj_PI + 45)/90*90
endif

if (0 > a or 360 < a) then
set a = a - a/360*360

if (0 > a) then
set a = a + 360
endif
endif

return a/180.*bj_PI[/code]

It is Nest's Code from is path blocked

 

[Lender]

well for bouncing , there's two option

1) bounce off Y-axis
2) bounce off X-axis

and this single function is not enough to determine this

EDIT : ok so what this function does
converts the angle to a single amount which is capable for determining the new angle with cos() or sin() (i think)

 

[Almia]

Just asking because i need a shorter code for the bouncing angle

 

[WaterKnight]

outAngle = inAngle + 2 * (mirrorAngle - inAngle) = 2 * mirrorAngle - inAngle

The mirrorAngle is orthogonal to the surface (means +-pi/2, which you have to know or tell us how to determine.

 

[Almia]

example:
my facing angle is 90 degrees and the offset has an off walkability.I have to move it to make it face the mirror angle

 

[WaterKnight]

___

 ^
 |
 |

So your surface is 0, the normal -pi/2. With an inAngle of pi/2, the difference is pi --> bounces back with pi/2+pi, straight downwards.

You may also dissect x/y components and reverse y, then revert to angle.

 

[Almia]

what? i dont get it.
Can you post a code or something?

 

[WaterKnight]

I do not really get your question either. Draw it.

 

[Almia]

example 90 degrees facing angle and the surface has a 315 degrees,so i need to bounce it on a bonus of 45 degrees.

 

[WaterKnight]

http://peeeq.de/draw.php?id=1065

surface --> 315

mirror (normal) to surface --> 135+90=225

inAngle = 90

difference between mirror and inAngle --> 225-90=135

135*2=270

add it to inAngle --> 90 + 270 = 360

revert it --> 360 + 180 = 540 --> 180

 

[gorillabull]

to get the bounce angle of an object in 2d or 3d space?

 

[Almia]

No need,i have found the solution