Locking Flying heights

[envenger]

How do i lock the flying height of a flying unit to a constant value?

In my case there is a projectile rotating around a unit. I want that projectile to have the same height as the unit and not go down and rise up when there are cliffs. How do i do that?

I tried setting the Flying height of the projectile to same z value of the unit around which it rotates but, it doesn't work...

here udg_rot = rotating projectle
udg_rotor = unit around which it rotates.

function Trig_Untitled_Trigger_002_Actions takes nothing returns nothing
    local location loc = GetUnitLoc(udg_rotor)
    local real z = GetLocationZ(loc)
    local real x1 = (CosBJ(udg_angle)*200)
    local real y1 = (SinBJ(udg_angle)*200)
    local real x2 = GetLocationX(GetUnitLoc(udg_rotor))
    local real y2 = GetLocationY(GetUnitLoc(udg_rotor))
    call SetUnitFlyHeight(udg_rot, z, 999)
    call SetUnitX(udg_rot, (x2-x1))
    call SetUnitY(udg_rot, (y2-y1))
    set udg_angle = ( udg_angle + 10.00 )
        if ( udg_angle >= 360.00 ) then
        set udg_angle = ( udg_angle - 360.00 )
        endif
    call RemoveLocation(loc)
    set loc = null
    call RemoveLocation(loc)
    set loc = null
endfunction

//===========================================================================
function InitTrig_Untitled_Trigger_002_Copy takes nothing returns nothing
    set gg_trg_Untitled_Trigger_002_Copy = CreateTrigger(  )
    call TriggerRegisterTimerEventPeriodic( gg_trg_Untitled_Trigger_002_Copy, 0.05)
    call TriggerAddAction( gg_trg_Untitled_Trigger_002_Copy, function Trig_Untitled_Trigger_002_Actions )
endfunction

 

[Maker]

function Trig_Untitled_Trigger_002_Actions takes nothing returns nothing
    local location loc = GetUnitLoc(udg_rotor)
    local real z = GetLocationZ(loc)
    local real z2
    local real x1 = (CosBJ(udg_angle)*200)
    local real y1 = (SinBJ(udg_angle)*200)
    local real x2 = GetLocationX(GetUnitLoc(udg_rotor))
    local real y2 = GetLocationY(GetUnitLoc(udg_rotor))
    call RemoveLocation(loc)
    call SetUnitX(udg_rot, (x2-x1))
    call SetUnitY(udg_rot, (y2-y1))
    set loc = GetUnitLoc(udg_rot)
    set z2 = GetLocationZ(loc)
    call SetUnitFlyHeight(udg_rot, 50 + z-z2, 0)
    set udg_angle = ( udg_angle + 10.00 )
        if ( udg_angle >= 360.00 ) then
        set udg_angle = ( udg_angle - 360.00 )
        endif
    call RemoveLocation(loc)
    set loc = null
endfunction

//===========================================================================
function InitTrig_Untitled_Trigger_002_Copy takes nothing returns nothing
    set gg_trg_Untitled_Trigger_002_Copy = CreateTrigger(  )
    call TriggerRegisterTimerEventPeriodic( gg_trg_Untitled_Trigger_002_Copy, 0.05)
    call TriggerAddAction( gg_trg_Untitled_Trigger_002_Copy, function Trig_Untitled_Trigger_002_Actions )
endfunction

That's the basic idea to prevent it from going down, but making it no go up is impossible as far as I know since units can't be positioned under the ground level.

 

[WaterKnight]

Well, you could shift the z offset of the model or inconveniently simulate cliffs/ground height in another way.

 

[envenger]

function Trig_Untitled_Trigger_002_Actions takes nothing returns nothing
    local location loc = GetUnitLoc(udg_rotor)
    local real z = GetLocationZ(loc)
    local real z2
    local real x1 = (CosBJ(udg_angle)*200)
    local real y1 = (SinBJ(udg_angle)*200)
    local real x2 = GetLocationX(GetUnitLoc(udg_rotor))
    local real y2 = GetLocationY(GetUnitLoc(udg_rotor))
    call RemoveLocation(loc)
    call SetUnitX(udg_rot, (x2-x1))
    call SetUnitY(udg_rot, (y2-y1))
    set loc = GetUnitLoc(udg_rot)
    set z2 = GetLocationZ(loc)
    call SetUnitFlyHeight(udg_rot, 50 + z-z2, 0)
    set udg_angle = ( udg_angle + 10.00 )
        if ( udg_angle >= 360.00 ) then
        set udg_angle = ( udg_angle - 360.00 )
        endif
    call RemoveLocation(loc)
    set loc = null
endfunction

//===========================================================================
function InitTrig_Untitled_Trigger_002_Copy takes nothing returns nothing
    set gg_trg_Untitled_Trigger_002_Copy = CreateTrigger(  )
    call TriggerRegisterTimerEventPeriodic( gg_trg_Untitled_Trigger_002_Copy, 0.05)
    call TriggerAddAction( gg_trg_Untitled_Trigger_002_Copy, function Trig_Untitled_Trigger_002_Actions )
endfunction

That's the basic idea to prevent it from going down, but making it no go up is impossible as far as I know since units can't be positioned under the ground level.

wow... thanks.... it works..!!

Well, you could shift the z offset of the model or inconveniently simulate cliffs/ground height in another way.

which other way?

 

[WaterKnight]

which other way?

Like doing the terrain via models, painting the pathing separately, triggering sight range, units' heights etc.

 

[envenger]

oh... ok..

Btw does the above trigger leak in any way?

 

[WaterKnight]

Yes, you use GetUnitLoc multiple times but do not clear up all instances. There is no need for locations anyway, just take GetUnitX/Y. Only for GetLocationZ a location is needed but you usually have a global one for that, whose coordinates you reset by MoveLocation rather than creating locations everytime. There is also no need for working in degrees.

 

[Maker]

No leaks.

 

[envenger]

Yes, you use GetUnitLoc multiple times but do not clear up all instances. There is no need for locations anyway, just take GetUnitX/Y. Only for GetLocationZ a location is needed but you usually have a global one for that, whose coordinates you reset by MoveLocation rather than creating locations everytime. There is also no need for working in degrees.

whats the MoveLocation?

I fixed the other problems in it... updating my final trigger.
It was not the final trigger which i wrote. I just wanted the concept to do... it

Any way thanks.

function Trig_Untitled_Trigger_002_Actions takes nothing returns nothing
    local real z2
    local location loc = GetUnitLoc(udg_rotor)
    local real z = GetLocationZ(loc)
    local real x1 = (Cos(udg_angle * bj_DEGTORAD)*200)
    local real y1 = (Sin(udg_angle * bj_DEGTORAD)*200)
    local real x2 = GetUnitX(udg_rotor)
    local real y2 = GetUnitY(udg_rotor)
    call RemoveLocation(loc)
    call SetUnitX(udg_rot, (x2-x1))
    call SetUnitY(udg_rot, (y2-y1))
    set loc = GetUnitLoc(udg_rot)
    set z2 = GetLocationZ(loc)
    call SetUnitFlyHeight(udg_rot, (50 + z) - z2, 0)
    set udg_angle = ( udg_angle + 10.00 )
        if ( udg_angle >= 360.00 ) then
        set udg_angle = ( udg_angle - 360.00 )
        endif
    call RemoveLocation(loc)
    set loc = null
endfunction

If i remove a location, should i null it after that?

 

[WaterKnight]

whats the MoveLocation?

http://jass.sourceforge.net/doc/api/common_j-source.shtml#1002

If i remove a location, should i null it after that?

Not the location but the location variable. This is only necessary if it's a local variable (not an argument of the function). Local variables are not properly cleaned up by the engine, so references/reference-counter to objects persist. The ids of objects won't get released until they are destroyed and all references have vanished. That's why one should null local handle vars.

 

[envenger]

ok..
so.. the trigger is correct i guess??