Move character in facing direction

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Tav

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Posted: 27th Aug 2008 18:52 Edited at: 27th Aug 2008 18:52

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Is there a way to move your character forward in the facing direction? I need to be able to turn my character and then when I click up my character needs to go forward in the angle his facing.
Here is what I have right now.
Main.cpp

+ Code Snippet

#include "DarkGDK.h"
#include "Player.h"
#include "string.h"

void DarkGDK( )
{
	dbSyncOn();
	dbSyncRate(60);

	dbLoadObject("H-Knight-Static.x", 1);
	//dbLoadObject("H-Knight-Move.x", 2);
	dbLoadBSP("ikzdm1.pk3", "ikzdm1.BSP");

	dbRotateCamera(30, 0, 0);
	dbSetCameraRange (0.05f, 30000);
	dbMoveCamera(-1);

	dbRotateObject(1, 0, 180, 0);
	
	Player *Knight = new Player;

	while(LoopGDK( ))
	{
		if (dbKeyState(17) == 1)
			*Knight->z += 0.1;
		if (dbKeyState(31) == 1)
			*Knight->z -= 0.1;
		if (dbKeyState(30) == 1)
			dbMoveObjectRight(1, 0.1);
		if (dbKeyState(32) == 1)
			dbMoveObjectLeft(1, 0.1);
		
		dbPositionObject(1, *Knight->x, *Knight->y, *Knight->z);
		dbPositionCamera(*Knight->x, *Knight->y + 5, *Knight->z - 5);
		dbSync();
	}
	delete Knight;
}

Player.h

+ Code Snippet

class Player
{
public:
	Player();
	~Player();
	float *x;
	float *y;
	float *z;
private:
	int health;
};

Player::Player()
{
	x = new float(0);
	y = new float(0);
	z = new float(0);
}
Player::~Player()
{
	delete x;
	delete y;
	delete z;
}

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elantzb

16

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Posted: 28th Aug 2008 00:30

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set up a member variable of your character's class to keep track of the direction he's facing. then write a member function to animate and move the character based on the direction variable via a switch statement.

~you can call me lantz~

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Carlos

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Posted: 28th Aug 2008 06:51

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You should use dbMoveObject ( int iObject, float fSpeed ) to move your object in its facing direction.

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Tav

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Posted: 28th Aug 2008 11:20 Edited at: 28th Aug 2008 11:23

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Thanks for the replies.

Quote: "set up a member variable of your character's class to keep track of the direction he's facing. then write a member function to animate and move the character based on the direction variable via a switch statement.
"

Don't I have to make 360 switch statements then? plus how do I actually move the character in that direction, a vector? or do you mean 4 variables (left, right, forward, backward)?

Quote: "You should use dbMoveObject ( int iObject, float fSpeed ) to move your object in its facing direction. "

I tried that, unfortunaly this moves my character up(Z) instead of forward.

But thanks for trying

.

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dark coder

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Location: Japan

Posted: 28th Aug 2008 13:45 Edited at: 28th Aug 2008 13:45

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But in GDK, D3D, OGL etc, Y is up! Have you not heard the term 'along the corridor, up the stairs', which is in reference to the 2D X and Y, Z is depth, though I believe CAD software brainwashes people into thinking otherwise, or people are just old fashioned and think they are looking at height maps.

Anyway, did you look at the move functions? You have 'dbMoveObjectUp/Down()' aka local Y axis movement.

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Tav

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Posted: 28th Aug 2008 13:58 Edited at: 28th Aug 2008 13:58

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I will soon, not at my computer atm. And your right about the Y axis :p.

Thanks for replying.

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Tav

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Posted: 28th Aug 2008 14:43

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Carlos and dark coder were right. It is dbObjectMove. Sorry.

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Niels Henriksen

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Posted: 29th Aug 2008 14:29

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@dark coder: I was always told it was "along the steet, up to the girl"

Niels Henriksen
www.tales-of-the-realms.com
if Microsoft can sell software with bugs, so can I.

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Bishop

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Location: In my favorite chair...

Posted: 29th Aug 2008 23:21

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Disclaimer: I am not on my home computer, so I cannot really test these particular snippits. I have used this method MANY times in the past, so the theory is sound.

Use the 'NewValue' commands for this. It will generate a new position based on the old position, and angle, and a step value. For instance;

dbNewXValue( oldxvalue, yangle, stepvalue )
dbNewZValue( oldzvalue, yangle, stepvalue )

These two commands, when used to position the object, will create the effect you're looking for. Here is a simple example;

+ Code Snippet

<IN PLAYER CONTROL FUNCTION>

float x, z;

<INPUT MODIFIER> (upkey, downkey, etc. )

x = dbNewXValue( dbObjectPositionX(1), dbObjectAngleY(1), 1 );
z = dbNewZValue( dbObjectPositionZ(1), dbObjectAngleY(1), 1 );

</INPUT MODIFIER>

dbPositionObject( 1, x, 0, z );

</IN PLAYER CONTROL FUNCTION>

This is a smooth method to control your player without relying on those nasty constrictive 'move' commands. Another note, if you are going for a sidestepping control, like in a standard WASD fps control system, simply modify the Y angle of the player object. For instance, to sidestep left, modify the angle by -90 degrees. +90 for the right.

Play with the commands, I guarentee they will work when you get the hang of them.

-Bishop

Tux is my guildmaster.

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elantzb

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Posted: 30th Aug 2008 00:25

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Quote: "Don't I have to make 360 switch statements then? plus how do I actually move the character in that direction, a vector? or do you mean 4 variables (left, right, forward, backward)?"

sorry, i should have taken your usage of Z as meaning that this was a 3D program.

~you can call me lantz~

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Dark GDK / Move character in facing direction