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Thread: 2d sidescroller moving background in java

  1. #1
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    Default 2d sidescroller moving background in java

    I have been following a 2d side scroller tutorial in java and have got the basics working, I changed the code a bit to make it so that the tiles and background are always moving, this worked as i intended. The relevant code is below:

    Within the character class:

    if (speedX < 0) {
                centerX += speedX;
            }
            if (speedX == 0 || speedX < 0) {
                bg1.setSpeedX(0);
                bg2.setSpeedX(0);
     
            }
            if (centerX <= 350 && speedX > 0) {
                centerX = centerX + speedX ;
            }
            if (speedX > 0 && centerX > 350) {
                bg1.setSpeedX(-MOVESPEED / 4);
                bg2.setSpeedX(-MOVESPEED / 4);
            }
    Within the tile class:

    speedX = bg.getSpeedX() * 3;
                tileX = tileX + speedX - 4;

    I wanted a way to make it so that if the character moves left, the tiles + background move slower. I am having issues with variable scope and setters/getters. Within the main game class, I have the code:

      case 
                   KeyEvent.VK_LEFT:
                   character.moveLeft();
                   character.setMovingLeft(true);
                   break;

    How can i include an if statement within the tile class that reads whether the character is moving left (determined from a keyPressed event in the main game class) and adjusts the speed of the tiles accordingly?

    I want to write something to the effect of:

     if (setMovingLeft = true){
                       speedX = bg.getSpeedX() * 3;
                       tileX = tileX + speedX - 1;     << changed from - 4

    Obviously this doesn't work, can anyone suggest a way to accomplish this? I can provide more information if needed.


  2. #2
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    Default Re: 2d sidescroller moving background in java

    '==' is the operator to check for equality. Further, comparing a boolean to 'true' or 'false' in a conditional statement is unnecessary. Simply if( flag ) or if ( !flag ) where 'flag' is a boolean variable is sufficient.

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