Jump problem - GameCreators Forum

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Yero008

13

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Joined: 5th Dec 2010

Location: Romania

Posted: 5th Dec 2010 21:28

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When I run the code the ball just goes down and doesn't stop.
the balls initial y is 23.

+ Code Snippet

int ball=101;
float g_fSpeed = 2.0f;
bool jump=false;
int maxheight=160;
float y_fSpeed=10.0; 
float y_pos=23.0;

+ Code Snippet

if (dbSpaceKey()==1 && jump==false)
	 jump=true;
if (jump=true && dbObjectPositionY(ball)<=maxheight+2) 
{    
dbPositionObject(ball,dbObjectPositionX(ball),y_pos,dbObjectPositionZ(ball));
		 y_fSpeed--;
		 y_pos+=y_fSpeed;
if ( dbObjectPositionY(ball)>=maxheight)
{	y_pos-=y_fSpeed;
dbPositionObject(ball,dbObjectPositionX(ball),y_pos,dbObjectPositionZ(ball));
			y_fSpeed++;
			if (y_fSpeed==0) jump=false;
		}

Forward thanks.

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Hawkblood

14

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Joined: 5th Dec 2009

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Posted: 6th Dec 2010 11:37

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You should put a manual stop to your y_fSpeed variable:

+ Code Snippet

if (!jump && dbObjectPositionY(ball)<=maxheight+2){
  y_fSpeed=0;
}

Also, in the line

Quote: "if (jump=true && dbObjectPositionY(ball)<=maxheight+2)"

the jump=true should be jump==true. There's a big difference between = and ==. And, any bool can be expressed in an if or while statement like:
if (jump){....}
while (jump){....}
or use the ! (not) for a condition with false.

The fastest code is the code never written.

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Yero008

13

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Joined: 5th Dec 2010

Location: Romania

Posted: 6th Dec 2010 15:04

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Thanks, i'll try it.

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Dodga

14

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Joined: 12th Dec 2009

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Posted: 7th Dec 2010 02:34

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The best way to do this would be to use sparky's to detect when you've hit a floor after the jump, then stop the decrease of the Y position variable.

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Yero008

13

Years of Service

User Offline

Joined: 5th Dec 2010

Location: Romania

Posted: 7th Dec 2010 20:35

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I have modified it to this and when i press space it jumps and then it falls down.
I have tried sparky but when i set the collision with the ground it doesn't let me go over it.
I included the whole "game" project.
What should I do, should I use sparky?
Forward thanks.

+ Code Snippet

if (dbSpaceKey()==1 && jump==false)
	 jump=true;	
	if (jump==true && dbObjectPositionY(ball)<=maxheight+2) 
	{    
	dbPositionObject(ball,dbObjectPositionX(ball),y_pos,dbObjectPositionZ(ball));
	y_fSpeed--;
	y_pos+=y_fSpeed;
		if (y_pos==maxheight) max=true;
	}
	if (max==true&&y_pos>21)
	{
	dbPositionObject(ball,dbObjectPositionX(ball),y_pos,dbObjectPositionZ(ball));
	y_fSpeed++;
	y_pos-=y_fSpeed;
	if (y_pos==23) {max=false;jump=false;y_pos=0;}
	}

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Dark GDK / Jump problem

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