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  Why does this cause a jump when switching directions?  (Read 907 times)
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Offline joeyismusic

Junior Member





« Posted 2012-03-21 16:50:34 »

I have tried to figure this out for like 6 hours now... I can't figure out why it causes a jump when I switch directions.

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   public void doMovement(long now) {
      move_north = false;
      move_south = false;
      move_east = false;
      move_west = false;
     
      if(keys[KeyEvent.VK_UP] == 1 && keys[KeyEvent.VK_DOWN] == 0) {
         move_north = true;
         moving_south = false;
      }
      if(keys[KeyEvent.VK_DOWN] == 1 && keys[KeyEvent.VK_UP] == 0) {
         move_south = true;
         moving_north = false;
      }
      if(keys[KeyEvent.VK_LEFT] == 1 && keys[KeyEvent.VK_RIGHT] == 0) {
         move_west = true;
         moving_east = false;
      }
      if(keys[KeyEvent.VK_RIGHT] == 1 && keys[KeyEvent.VK_LEFT] == 0) {
         move_east = true;
         moving_west = false;
      }
     
      if(move_north && !moving_north) {
         if(player.move(player.x, player.y + 1, player.z)) {
            moving_north = true;
            offsety = -32;
         }
      }
      if(move_south && !moving_south) {
         if(player.move(player.x, player.y - 1, player.z)) {
            moving_south = true;
            offsety = 32;
         }
      }
     
      if(move_west && !moving_west) {
         if(player.move(player.x -1, player.y, player.z)) {
            moving_west = true;
            offsetx = -32;
         }
      }
      if(move_east && !moving_east) {
         if(player.move(player.x + 1, player.y, player.z)) {
            moving_east = true;
            offsetx = 32;
         }
      }
     
      if(now > offset_timer) {
         offset_timer = now + offset_timer_length;
         if(offsetx < 0) offsetx ++;
         if(offsetx > 0) offsetx --;
         if(offsety < 0) offsety ++;
         if(offsety > 0) offsety --;
      }
     
      if(offsetx == 0) {
         moving_east = false;
         moving_west = false;
      }
      if(offsety == 0) {
         moving_north = false;
         moving_south = false;
      }
     
   }
Offline jimeowan

Junior Member


Medals: 1
Projects: 1



« Reply #1 - Posted 2012-03-21 16:58:02 »

If "jumping" means "changing player.z", then the problem is not here, since player.z is modified nowhere in the code your shared.

A good point to start investigating would be to trace or add break points to every place where player.z is edited, and see what happens when you change direction.

Author of "The Little Scientist" (judging panel winner for Java4K 2012 </brag>)
Offline joeyismusic

Junior Member





« Reply #2 - Posted 2012-03-21 17:02:23 »

Edit: to clarify, Z is just the "map" you're on.

by jump i mean, a sudden "large" shift in offset position.

I DID figure it out though, JUST NOW

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   public void doMovement(long now) {
      move_north = false;
      move_south = false;
      move_east = false;
      move_west = false;
     
      if(keys[KeyEvent.VK_UP] == 1 && keys[KeyEvent.VK_DOWN] == 0) {
         move_north = true;
         moving_south = false;
      }
      if(keys[KeyEvent.VK_DOWN] == 1 && keys[KeyEvent.VK_UP] == 0) {
         move_south = true;
         moving_north = false;
      }
      if(keys[KeyEvent.VK_LEFT] == 1 && keys[KeyEvent.VK_RIGHT] == 0) {
         move_west = true;
         moving_east = false;
      }
      if(keys[KeyEvent.VK_RIGHT] == 1 && keys[KeyEvent.VK_LEFT] == 0) {
         move_east = true;
         moving_west = false;
      }
     
      if(move_north && !moving_north && !moving_south && offsety == 0) {
         if(player.move(player.x, player.y + 1, player.z)) {
            moving_north = true;
            offsety = -32;
         }
      }
      if(move_south && !moving_south && !moving_north && offsety == 0) {
         if(player.move(player.x, player.y - 1, player.z)) {
            moving_south = true;
            offsety = 32;
         }
      }
     
      if(move_west && !moving_west && !moving_east && offsetx == 0) {
         if(player.move(player.x -1, player.y, player.z)) {
            moving_west = true;
            offsetx = -32;
         }
      }
      if(move_east && !moving_east && !moving_west && offsetx == 0) {
         if(player.move(player.x + 1, player.y, player.z)) {
            moving_east = true;
            offsetx = 32;
         }
      }
     
      if(now > offset_timer) {
         offset_timer = now + offset_timer_length;
         if(offsetx < 0) offsetx ++;
         if(offsetx > 0) offsetx --;
         if(offsety < 0) offsety ++;
         if(offsety > 0) offsety --;
      }
     
      if(offsetx == 0) {
         moving_east = false;
         moving_west = false;
      }
      if(offsety == 0) {
         moving_north = false;
         moving_south = false;
      }
     
   }


The above code does not allow any visual shifts
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