Help with movement animations - GameCreators Forum

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Orin

16

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Joined: 16th Feb 2008

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Posted: 18th Feb 2008 09:16

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I Have decided to put off my space sim till i get better at dgdk,

i have decided a better bit of practace would be to make a 3d side scroller, it is very minimal in code right now as im trying to nail down the movement animations and what not,

so far all i have is a walk anim. the problem is useing the dbLoopObject doesnt stop looping after the button is depressed and released, i have tryed a few things like setting up if else statements but im not sure exactly how to impliment it, im useing a stock dgdk model for the player char as i dont have to put hr's in to building the models from scratch then animateing them.

here is my code, as i said its very minimal and simplistic as all the things in the samples and what not really are no help here.

// Dark GDK - The Game Creators - www.thegamecreators.com

// the wizard has created a very simple project that uses Dark GDK
// it contains the basic code for a GDK application

// whenever using Dark GDK you must ensure you include the header file
#include "DarkGDK.h"

void showFPS ();
char czFPS[10];
char czText[256];
bool IsWalking;
int IsIdle;

// the main entry point for the application is this function
void DarkGDK ( void )
{
	// turn on sync rate and set maximum rate to 60 fps
	dbSyncOn   ( );
	dbSyncRate ( 60 );

dbPrint("Loading Please Standby");
	dbSync();
	dbSync();

//load our models.
	dbLoadObject("Colonel-X\\Colonel-X.X", 1);
	dbYRotateObject(1,-90);
	dbScaleObject(1,30,30,30);

dbPositionCamera( 0, 50, -80);

bool IsWalking;

// our main loop
	while ( LoopGDK ( ) )
	{
		if (IsWalking == true)
		{
			dbLoopObject(1, 235, 259);
		}

else
		{
			IsWalking = false;
		
		}
		
		if ( dbRightKey() || dbKeyState(32) == 1)
		{			
			dbMoveObject(1, -0.1f);
			IsWalking= true;
			dbRotateObject(1,0.0f,-90.f,0.0f);
			dbSetObjectSpeed (1, 30);
			
		}
	
		
		if ( dbLeftKey() || dbKeyState(31) == 1)
		{
		    dbMoveObject(1, -0.1f);
			dbLoopObject(1, 235, 259);
			dbSetObjectSpeed(1, 30);
			dbRotateObject(1,0.0f,90.0f,0.0f);
		}

// update the screen
		dbSync ( );
	}

// return back to windows
	return;
}

void showFPS()
	{
		//Int iLoop;
		char czText[256];

wsprintf (czFPS , "%d FPS " , dbScreenFPS ( ) );
	dbText ( 0 , 0 , czFPS );

//wsprintf ( czText , "%d HEALTH " , health );
	//dbText ( 0 , 15 , czText );

/*for ( iLoop = 0 ; iLoop < visCount ; iLoop++ )
	{
		sprintf	( czText , "Vis %d , Start = %d, End = %d, Start Obj = %d, End Obj = %d" , iLoop , vis[iLoop].start , vis[iLoop].end , vis[iLoop].startObj , vis[iLoop].endObj );
		dbText	( 0 , ( iLoop + 1 ) * 15 , czText );
	}

sprintf ( czText , "Current Vis = %d" , currentVis );
	dbText ( 0 , 600-20 , czText );*/

}

+ Code Snippet


// Dark GDK - The Game Creators - www.thegamecreators.com

// the wizard has created a very simple project that uses Dark GDK
// it contains the basic code for a GDK application

// whenever using Dark GDK you must ensure you include the header file
#include "DarkGDK.h"

void showFPS ();
char czFPS[10];
char czText[256];
bool IsWalking;
int IsIdle;



// the main entry point for the application is this function
void DarkGDK ( void )
{
	// turn on sync rate and set maximum rate to 60 fps
	dbSyncOn   ( );
	dbSyncRate ( 60 );

	dbPrint("Loading Please Standby");
	dbSync();
	dbSync();

	




//load our models.
	dbLoadObject("Colonel-X\\Colonel-X.X", 1);
	dbYRotateObject(1,-90);
	dbScaleObject(1,30,30,30);

	dbPositionCamera( 0, 50, -80);

    
	bool IsWalking;

	

	// our main loop
	while ( LoopGDK ( ) )
	{
		if (IsWalking == true)
		{
			dbLoopObject(1, 235, 259);
		}

		else
		{
			IsWalking = false;
		
		}
		
		if ( dbRightKey() || dbKeyState(32) == 1)
		{			
			dbMoveObject(1, -0.1f);
			IsWalking= true;
			dbRotateObject(1,0.0f,-90.f,0.0f);
			dbSetObjectSpeed (1, 30);
			
		}
	
		
		if ( dbLeftKey() || dbKeyState(31) == 1)
		{
		    dbMoveObject(1, -0.1f);
			dbLoopObject(1, 235, 259);
			dbSetObjectSpeed(1, 30);
			dbRotateObject(1,0.0f,90.0f,0.0f);
		}
		


		// update the screen
		dbSync ( );
	}

	// return back to windows
	return;
}

void showFPS()
	{
		//Int iLoop;
		char czText[256];

		wsprintf (czFPS , "%d FPS " , dbScreenFPS ( ) );
	dbText ( 0 , 0 , czFPS );

	//wsprintf ( czText , "%d HEALTH " , health );
	//dbText ( 0 , 15 , czText );

	/*for ( iLoop = 0 ; iLoop < visCount ; iLoop++ )
	{
		sprintf	( czText , "Vis %d , Start = %d, End = %d, Start Obj = %d, End Obj = %d" , iLoop , vis[iLoop].start , vis[iLoop].end , vis[iLoop].startObj , vis[iLoop].endObj );
		dbText	( 0 , ( iLoop + 1 ) * 15 , czText );
	}

	sprintf ( czText , "Current Vis = %d" , currentVis );
	dbText ( 0 , 600-20 , czText );*/

}

if anyone knows what im doing wrong and can help me figure it out i would really appreciate it, right now all i need is some one to help me get my model to use the walk loop when the rightarrokey is pressed and to go into an idle anim when it isnt, thanks in advance. orin

ill get there sooner or later, just you watch.

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jason p sage

17

Years of Service

User Offline

Joined: 10th Jun 2007

Location: Ellington, CT USA

Posted: 19th Feb 2008 06:31

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Orin - First - I think this is important. Change your code to move not on arbitrary "values" that "look right" on your PC. Instead - learn how to user timer based movement. This way your game will run approximately the same "Speed" on various PC's.

Second - Animations work the same way with 3d Objects - in that you can drop the whole "loop" business - and Set the animation "Position" each loop - again based on timer logic. (Sounds harder than it is. Increment Animation frame by "Animation Increment Per Thousandth of a Sec * TimeElapsed".

Loop Object is very Rigid and is based on the Sync rate - and this may work - it is not a good practice to get into and rely on.

Note also - animations "frames" with 3d objects are actually floats - so you can have an animation frame be at 1.5 for example.

You may find smoother animation for example if your start frame is 2.34 and the end frame is 10.36. (Just made up values to get the point across)

Also - the whole idle - walking thing? A simple flag named something like IDLE: bool Idle; Should do ya. Set it to TRUE before you poll the user's keypresses. If any "Walking" keys are pressed - set this flag to FALSE (NOT IDLE)... Then change the object animation accordingly.

Hope this sparks some ideas. there are some good posts, threads, newletter articles and CODE BASE entries that discuss Timer Based Movement and Timer Based Animations.

To Summerize - dbTimer() is a function that returns Milliseconds since Midnight I think. The Whole FOUNDATION for TimerBased movement and animations is here:

jgc_clock.h

+ Code Snippet

#pragma once

//---------------------------------------------------------------------
class JGC_CLOCK{
//---------------------------------------------------------------------
public:
  int Time_New;
  int Time_Old;
  int Time_Elapsed;
  void Update(void);
  JGC_CLOCK();
  ~JGC_CLOCK();
};
//---------------------------------------------------------------------

jgc_clock.cpp

#include <DarkGDK.h>
#include "jgc_clock.h"

//============================================================================
// Begin                       JGC_CLOCK
//============================================================================

//----------------------------------------------------------------------------
JGC_CLOCK::JGC_CLOCK(){
//----------------------------------------------------------------------------
  this->Time_New=dbTimer();
  this->Time_Old=this->Time_New-1; // force i millisec elapsed to start
  this->Time_Elapsed = this->Time_New - this->Time_Old; // Self documenting
  // not necessary - Not Harmful. 
};
//----------------------------------------------------------------------------

//----------------------------------------------------------------------------
JGC_CLOCK::~JGC_CLOCK(){
//----------------------------------------------------------------------------
};
//----------------------------------------------------------------------------

//----------------------------------------------------------------------------
void JGC_CLOCK::Update(void){ 
//----------------------------------------------------------------------------
  int TempTime = dbTimer();
  if(TempTime!=this->Time_New){
    this->Time_Old = this->Time_New;
    this->Time_New=TempTime;
    this->Time_Elapsed =  this->Time_New - this->Time_Old;
  };  
};
//----------------------------------------------------------------------------

//============================================================================
// End                         JGC_CLOCK
//============================================================================

+ Code Snippet

#include <DarkGDK.h>
#include "jgc_clock.h"

//============================================================================
// Begin                       JGC_CLOCK
//============================================================================

//----------------------------------------------------------------------------
JGC_CLOCK::JGC_CLOCK(){
//----------------------------------------------------------------------------
  this->Time_New=dbTimer();
  this->Time_Old=this->Time_New-1; // force i millisec elapsed to start
  this->Time_Elapsed = this->Time_New - this->Time_Old; // Self documenting
  // not necessary - Not Harmful. 
};
//----------------------------------------------------------------------------

//----------------------------------------------------------------------------
JGC_CLOCK::~JGC_CLOCK(){
//----------------------------------------------------------------------------
};
//----------------------------------------------------------------------------

//----------------------------------------------------------------------------
void JGC_CLOCK::Update(void){ 
//----------------------------------------------------------------------------
  int TempTime = dbTimer();
  if(TempTime!=this->Time_New){
    this->Time_Old = this->Time_New;
    this->Time_New=TempTime;
    this->Time_Elapsed =  this->Time_New - this->Time_Old;
  };  
};
//----------------------------------------------------------------------------


//============================================================================
// End                         JGC_CLOCK
//============================================================================

Basically - this code has what ya need - but if you wish to use this class... At the top of your program make sure to

+ Code Snippet

#include "jgc_clock.h"

then before your main loop - set up an instance of this class:

+ Code Snippet

  JGC_CLOCK *Clock = new JGC_CLOCK();

then in your main loop just call the update function at the top of your loop like this:

+ Code Snippet

  Clock->Update();

Now you can ALWAYS do timer based logic based on this value:

+ Code Snippet

  Clock->Time_Elapsed

Good Luck - hope this helps you out a bit.

http://www.jasonpetersage.com/?PAGE=ironinfantry&SECTION=ironinfantry

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Orin

16

Years of Service

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Joined: 16th Feb 2008

Location:

Posted: 19th Feb 2008 07:06

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Wow thats alot more then I expected, Thank you. not sure I understand it all and how to use it but that's why im tinkering with it. so I can learn this stuff. anyway. Thank you very much and it may not help alot now but after i figure out how to use it and how it works im very sure that it will help me out alot.

ill get there sooner or later, just you watch.

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Dark GDK / Help with movement animations