LWJGL Forum

Hi,

first post and an odd problem here but please excuse any naivety.  I'm programming a simple (wish) platform game but am having some fun with the left and right key presses.   I'm using the Sonic Physics guide for help.  http://info.sonicretro.org/SPG:Running

Left works fine but right doesn't - it's too slow to respond in a key frame.  One press of right results in an initial value of

Right:0.046875
Right:0.09375
Right:0.140625
Right:0.1875
Slowing:0.1171875
Slowing:0.046875
Slowing:0.0

but the same on left gives

Left:-0.046875
Slowing:0.0
Left:-0.046875
Slowing:0.0
Left:-0.046875
Slowing:0.0
Left:-0.046875
Slowing:0.0

This method responds to the key presses and is called every frame.
   private void frameUpdate()
   {
       //Update the sensor lines so we know when to stop the player
       player.updateSensorLines();
       
       //Basic keyboard movements
       if (Keyboard.isKeyDown(Keyboard.KEY_LEFT)) {
           if (isBlockedLeft()) { player.dx = 0; }
           else {
               player.updateSpeed(-1);
           }
       
       } if (Keyboard.isKeyDown(Keyboard.KEY_RIGHT)) {
           if(isBlockedRight()) { player.dx = 0; }
           else {
               player.updateSpeed(1);
           }
       
       } else if(player.dx != 0) {
           player.updateSpeed(0);
       }
       
       if (Keyboard.isKeyDown(Keyboard.KEY_SPACE)) {
           System.out.println("Jump/Space Pressed");    
       }
       player.update();
     
   }

This code updates the speed
    public void updateSpeed(int dir)
    {
        switch(dir) {
            case -1: //Left
                dx += -ACCELERATION;
                if (dx < -MAX_SPEED) {
                    dx = -MAX_SPEED;
                }
                System.out.println("Left:"+dx);
                break;
            case 1: //Right
                dx += ACCELERATION;
                if (dx > MAX_SPEED) {
                    dx = MAX_SPEED;
                }
                System.out.println("Right:"+dx);
                break;
            default: //No Key Pressed so let friction occur
                if (dx < -FRICTION) { dx += FRICTION; }
                if (dx > FRICTION) { dx += -FRICTION; }
                else { dx = 0; }
                System.out.println("Slowing:"+dx);
                break;
        }     
    }

I'd really welcome some ideas here because it doesn't make sense to me that they are behaving differently.

Thanks

Chris

Ignore me.   I sussed it.  I was missing an else .
I wouldn't normally continue an if on the same line as a close without an if so didn't see it. 
What a waste of time this morning !!!

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