o3de/Gems/PhysicsEntities/Assets/Scripts/Entities/Physics/Wind.lua

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--
-- All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
-- its licensors.
--
-- For complete copyright and license terms please see the LICENSE at the root of this
-- distribution (the "License"). All use of this software is governed by the License,
-- or, if provided, by the license below or the license accompanying this file. Do not
-- remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
--
--
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Wind = {
    type = "WindController",
    Properties = {    
        vVelocity={x=1.0,y=0.0,z=0.0},
        
        fFadeTime = 1,--used only when the fog is triggered manually, with activate/deactivate events.
    },
    
    Editor={
        Icon="Tornado.bmp",
    },
}


function Wind:OnInit()
    self.oldVelocity = {x=0.0,y=0.0,z=0.0};
    self.occupied = 0;
    self.lasttime = 0;
    
    self:OnReset();

    self:RegisterForAreaEvents(1);
end

function Wind:OnPropertyChange()
    self:OnReset();
end

function Wind:OnReset()
    self:RegisterForAreaEvents(1);
end

function Wind:OnSave(tbl)
    tbl.bTriggered = self.bTriggered
    tbl.oldVelocity = self.oldVelocity
    tbl.fadeamt = self.fadeamt
    tbl.Who = self.Who
end

function Wind:OnLoad(tbl)
    self.bTriggered = tbl.bTriggered
    self.oldVelocity = tbl.oldVelocity
    self.fadamt = tbl.fadeamt
    self.Who = tbl.Who
end

-----------------------------------------------------------------------------
--    fade: 0-out 1-in
function Wind:OnProceedFadeArea( player,areaId,fadeCoeff )
    self:Fade(fadeCoeff);
end

function Wind:ResetValues()
    System.SetWind(self.oldVelocity);
end

-----------------------------------------------------------------------------
function Wind:OnEnterArea( player,areaId )

    if((player and (not player.actor:IsPlayer())) or self.occupied == 1) then
        return
    end    
    
    self.oldVelocity = System.GetWind();
        
    self.occupied = 1;
end

-----------------------------------------------------------------------------
function Wind:OnLeaveArea( player,areaId )

    if(player and (not player.actor:IsPlayer())) then
        return
    end    
    
    self:ResetValues();
    
    self.occupied = 0;
end
-----------------------------------------------------------------------------
function Wind:OnShutDown()
    self:RegisterForAreaEvents(0);
end

function Wind:Event_Enable( sender )
        
    if(self.occupied == 0 ) then
        
        if (self.fadeamt and self.fadeamt<1) then
            self:ResetValues();
        end
        
        self:OnEnterArea( );
        
        self.fadeamt = 0;
        self.lasttime = _time;
        self.exitfrom = nil;
    end    
    
    self:SetTimer(0, 1);
    
    BroadcastEvent( self,"Enable" );
end

function Wind:Event_Disable( sender )
        
    if(self.occupied == 1 ) then
        
        --self:OnLeaveArea( );
        self.occupied = 0;
        
        self.fadeamt = 0;
        self.lasttime = _time;
        self.exitfrom = 1;
    end    
    
    self:SetTimer(0, 1);
    
    BroadcastEvent( self,"Disable" );
end

function Wind:OnTimer()

    --System.Log("Ontimer ");

    self:SetTimer(0, 1);
    
    if (self.fadeamt) then
    
        local delta = _time - self.lasttime;
        self.lasttime = _time;
    
        self.fadeamt = self.fadeamt + (delta / self.Properties.fFadeTime);
    
        if (self.fadeamt>=1) then
            
            self.fadeamt = 1;
            self:KillTimer(0);
        end
        
        ----------------------------------------------
        --fade    
        local fadeCoeff = self.fadeamt;
        
        if (self.exitfrom) then
            fadeCoeff = 1 - fadeCoeff;    
        end
        
        fadeCoeff = math.sqrt( fadeCoeff );
        fadeCoeff = math.sqrt( fadeCoeff );
    
        self:Fade(fadeCoeff);
        --self:OnProceedFadeArea( nil,0,self.fadeamt );
    else
        self:KillTimer(0);
    end
end

function Wind:Fade(fadeCoeff)
    System.SetWind(LerpColors(self.oldVelocity, self.Properties.vVelocity, fadeCoeff));
end

Wind.FlowEvents =
{
    Inputs =
    {
        Disable = { Wind.Event_Disable, "bool" },
        Enable = { Wind.Event_Enable, "bool" },
    },
    Outputs =
    {
        Disable = "bool",
        Enable = "bool",
    },
}