How do enemies follow you?

blackhawx

Where in tutorial.js do the purple enemies, (for demo 3), follow you. The red enemies go straight, but I can't find out how the purple ones follow...

Thanks!

selim

Each time a enemy position is update the following method is called on its associated object:

this.update = function(playerNode){
       this.updateX(playerNode);
       this.updateY(playerNode);
};

There you can see that this method in turn update the X and Y coordinate of the enemy. For the purple enemies the following code gets executed for the Y coordinate update:

Brainy.prototype.updateY = function(playerNode){
          if((this.node[0].gameQuery.posy+this.alignmentOffset) > $(playerNode)[0].gameQuery.posy){
            var newpos = parseInt(this.node.css("top"))-this.speedy;
            this.node.css("top",""+newpos+"px");
          } else if((this.node[0].gameQuery.posy+this.alignmentOffset) < $(playerNode)[0].gameQuery.posy){
            var newpos = parseInt(this.node.css("top"))+this.speedy;
            this.node.css("top",""+newpos+"px");
          }
}

There you can see why the enemy Y position align with the player position.

Howdy, Stranger!

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