topical media & game development
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graphic-o3d-samples-io-actors-arrow.js / js



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@fileoverview This file defines the Arrow class.
An arrow that Io can shoot. 

  
  function Arrow(initObj) {
    this.absorbNamedValues(initObj);
  
    // Hide myself by moving way off the screen.
    this.z = -10000;
    this.mapX = -10000;
    this.width = 40;
    this.height = 1;
    this.velX = 0;
  
    // Figure out which arrow number I am.
    this.arrowNumber = parseInt(initObj.name.substr(initObj.name.length-1,1));
  
  }
  Arrow.prototype = new Actor;
  
  Arrow.prototype.onTick = function(timeElapsed) {
    if (this.mapX < avatar.mapX-500 || this.mapX > avatar.mapX+500 &&
        this.z > -10000) {
      // then hide ourselves way off screen.
      this.mapX = -10000;
      this.z = -10000;
      updateActor(this);
    } else {
      // Here's how I move. moveMapX is a handy function that updates both
      // my "virtual 2d world" mapX, as well as my literal x + y values
      this.moveMapX(this.velX)
      updateActor(this);
    }
  }
  
  Arrow.prototype.shoot = function() {
    this.x = avatar.x;
    this.y = avatar.y;
    this.z = avatar.z + 33; // Approximate height of IO's crossbow.
    this.platformID = avatar.platformID;
    this.parentPlatformID = avatar.parentPlatformID;
    this.rotZ = world.platforms[this.platformID].rotZ;
    this.mapX = avatar.mapX;
  
    if (Math.abs(avatar.rotZ - this.rotZ) < Math.PI/2) {
      this.velX = 50;
    } else {
      this.velX = -50;
      this.rotZ -= Math.PI;
    }
    soundPlayer.play('sound/arrow.mp3', 100);
    updateActor(this);
  }
  
  // TODO: This should be a generic concept, not an arrow-specifc
  // thing.
  Arrow.prototype.hide = function() {
    this.mapX = -10000;
  }
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

(C) Æliens 20/2/2008

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