need help with particle scripting

[Kamaeru]

I want to use this in my emitter to draw the particle image at a different 90 degree angle depending on the player's direction. It should work I think, but it doesn't. I'm assuming it only calculates the rotated image once and never again. I can't think of a way to change it though. Is there a way to handle this?

NPC Code:

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rotation = (pi / 2) + player.dir * (pi / 2);

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To be more specific, I'm working on a script that draws footsteps behind the player when they walk, and to finish it I need to get the footsteps to draw in the correct corresponding direction. Seems like it would be easy, but I just spent a few hours trying to figure it out and failed. It seems like there is no way to change the image or rotate it once the emitter has started. I also couldn't find any documentation explaining how to properly stop an emitter.

NPC Code:

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function drawFootSteps() {

  this.drawdir = player.dir;

  

  with (findImg(200)) {

    attachtoowner = true;

    offsetx = 1.0 - vecx(player.dir);

    offsety = 1.5 + (vecy(player.dir) * 0.8) + (abs(vecx(player.dir)) * 0.2) - (vecx(player.dir) * 0.15);

    layer = 0;

    

    with (emitter) {

      delaymin = 0.1;

      delaymax = 0.2;

      nrofparticles = 1;

      continueafterdestroy = true;

      

      with (particle) {

        emissionoffset = {0.2 + offsetx,0.2 + offsety,0};

        

        spin = 0;

        angle = 0;

        

        rotation = (pi / 2) + this.drawdir * (pi / 2);

      

        

        image = "bi_effect_footsteps.png";

        speed = 0;

        mode = 1;

        

        lifetime = 1.2;

        alpha = 1;

        zoom = 1;

      }

      

      addLocalModifier("range",0.5,1.2,"alpha","add",- 0.7,- 0.7);

      addLocalModifier("once",0,0,"x","add",- vecy(player.dir) * 0.3,vecy(player.dir) * 0.3);

      temp.addy1 = (vecx(player.dir) > 0 ? - vecx(player.dir) * 0.2 : vecx(player.dir) * 0.3);

      temp.addy2 = (vecx(player.dir) < 0 ? - vecx(player.dir) * 0.2 : vecx(player.dir) * 0.3);

      addLocalModifier("once",0,0,"y","add",temp.addy1,t  emp.addy2);

      settimer(.05);

    }

   }

  }

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