181 lines
11 KiB
C++
181 lines
11 KiB
C++
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// Copyright 2020 Electronic Arts Inc.
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//
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// TiberianDawn.DLL and RedAlert.dll and corresponding source code is free
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// software: you can redistribute it and/or modify it under the terms of
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// the GNU General Public License as published by the Free Software Foundation,
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// either version 3 of the License, or (at your option) any later version.
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// TiberianDawn.DLL and RedAlert.dll and corresponding source code is distributed
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// in the hope that it will be useful, but with permitted additional restrictions
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// under Section 7 of the GPL. See the GNU General Public License in LICENSE.TXT
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// distributed with this program. You should have received a copy of the
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// GNU General Public License along with permitted additional restrictions
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// with this program. If not, see https://github.com/electronicarts/CnC_Remastered_Collection
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/* $Header: F:\projects\c&c\vcs\code\facing.cpv 1.9 16 Oct 1995 16:49:40 JOE_BOSTIC $ */
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/***********************************************************************************************
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*** C O N F I D E N T I A L --- W E S T W O O D S T U D I O S ***
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***********************************************************************************************
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* *
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* Project Name : Command & Conquer *
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* *
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* File Name : FACING.CPP *
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* *
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* Programmer : Joe L. Bostic *
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* *
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* Start Date : 03/21/95 *
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* *
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* Last Update : March 21, 1995 [JLB] *
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* *
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*---------------------------------------------------------------------------------------------*
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* Functions: *
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* FacingClass::Rotation_Adjust -- Perform a rotation adjustment to current facing. *
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* FacingClass::Set_Current -- Sets the current rotation value. *
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* FacingClass::Set_Desired -- Sets the desired facing value. *
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* FacingClass::FacingClass -- Default constructor for the facing class. *
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* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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#include "function.h"
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#include "facing.h"
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/***********************************************************************************************
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* FacingClass::FacingClass -- Default constructor for the facing class. *
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* *
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* This default constructor merely sets the desired and current facing values to be the *
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* same (North). *
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* *
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* INPUT: none *
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* *
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* OUTPUT: none *
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* *
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* WARNINGS: none *
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* *
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* HISTORY: *
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* 03/21/1995 JLB : Created. *
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*=============================================================================================*/
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FacingClass::FacingClass(void)
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{
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CurrentFacing = DIR_N;
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DesiredFacing = DIR_N;
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}
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/***********************************************************************************************
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* FacingClass::Set_Desired -- Sets the desired facing value. *
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* *
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* This routine is used to set the desired facing value without altering the current *
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* facing setting. Typicall use of this routine is when a vehicle needs to face a *
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* direction, but currently isn't facing the correct direction. After this routine is *
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* called, it is presumed that subsequent calls to Rotation_Adjust() will result in the *
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* eventual alignment of the current facing. *
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* *
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* INPUT: facing -- The new facing to assign to the desired value. *
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* *
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* OUTPUT: bool; Did the desired facing value actually change by this routine call? *
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* *
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* WARNINGS: none *
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* *
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* HISTORY: *
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* 03/21/1995 JLB : Created. *
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*=============================================================================================*/
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int FacingClass::Set_Desired(DirType facing)
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{
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if (DesiredFacing != facing) {
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DesiredFacing = facing;
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return(true);
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}
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return(false);
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}
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/***********************************************************************************************
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* FacingClass::Set_Current -- Sets the current rotation value. *
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* *
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* This routine will set the current rotation value. It is used to override the facing *
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* value without adjusting the desired setting. *
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* *
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* INPUT: facing -- The new facing to assign to the current facing value. *
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* *
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* OUTPUT: bool; Was the current setting changed by this routine. Failure means that the *
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* current setting was already at the value specified. *
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* *
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* WARNINGS: none *
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* *
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* HISTORY: *
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* 03/21/1995 JLB : Created. *
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*=============================================================================================*/
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int FacingClass::Set_Current(DirType facing)
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{
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if (CurrentFacing != facing) {
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CurrentFacing = facing;
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return(true);
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}
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return(false);
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}
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/***********************************************************************************************
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* FacingClass::Rotation_Adjust -- Perform a rotation adjustment to current facing. *
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* *
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* This routine is used when the current and desired facings differ but the current *
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* facing should be adjusted toward the desired facing. The amount of rotation to adjust *
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* is provided as a rotation rate parameter. Typical use of this routine is for turrets *
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* and other vehicle related rotating. *
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* *
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* INPUT: rate -- The rotation rate to use when adjusting the current facing toward the *
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* desired facing. A value of 127 means instantaneous rotation. *
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* *
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* OUTPUT: bool; Did the rotation result in the current facing transitioning from one *
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* 1/32 zone to another? If true, then the owning object most likely will *
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* need to be redrawn to reflect the change. *
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* *
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* WARNINGS: none *
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* *
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* HISTORY: *
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* 03/21/1995 JLB : Created. *
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*=============================================================================================*/
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int FacingClass::Rotation_Adjust(int rate)
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{
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/*
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** Only perform the rotation adjustment if the desired facing is not the
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** same as the current facing.
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*/
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if (Is_Rotating()) {
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rate = MIN(rate, 127);
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DirType oldfacing = CurrentFacing;
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int diff = Difference();
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/*
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** If the allowed facing change is greater than the difference between
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** the current facing and the desired facing, then just snap the
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** facing to the new value.
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*/
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if (ABS(diff) < rate) {
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CurrentFacing = DesiredFacing;
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} else {
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/*
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** Adjust the current facing clockwise or counterclockwise depending
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** on the shortest distance to the desired facing from the current
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** facing.
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*/
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if (diff < 0) {
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CurrentFacing = (DirType)(CurrentFacing - (DirType)rate);
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} else {
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CurrentFacing = (DirType)(CurrentFacing + (DirType)rate);
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}
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}
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/*
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** If this facing adjustment caused the current facing to rotate into a
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** new 1/32 rotation zone (likely to cause a redraw), then return
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** this fact with a true value.
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*/
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return(Facing_To_32(CurrentFacing) != Facing_To_32(oldfacing));
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}
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return(false);
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}
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