// This tool is used to define a very simple line between two points.
// It is used by the BlueprintScaler to specify a sample distance to scale.

var LineTool = MapTool.extend(function(base){
	var exports = {}
	
	var selected_point = null
	
	var line = exports.line = []
	
	var can_drag, dragging
	
	exports.down = function(e, cursor){

    // rightclick?
    if (e.ctrlKey || e.which === 3) {
      cursor.quantize(1/map.zoom)
      app.router.blueprintView.map.center.a = cursor.x.a
      app.router.blueprintView.map.center.b = -cursor.y.a
      cursor.x.b = cursor.x.a
      cursor.y.b = cursor.y.a
      return
    }
    
	  this.cursor = cursor
	  switch (line.length) {
	    case 0:
        line[0] = cursor.x_component()
        can_drag = true
        break
      case 1:
        line[1] = cursor.x_component()
        can_drag = false
        break
      case 2:
        line[0] = cursor.x_component()
        line.pop()
        can_drag = true
        break
    }
	}
	
	exports.move = function(e, cursor){
    this.cursor = cursor
	}
	
	exports.drag = function(e, cursor){
	  if (dragging) {
	    line[1].a = cursor.x.b
	    line[1].b = cursor.y.b
	  }
	  else if (can_drag && cursor.magnitude() > 10/map.zoom) {
	    line[1] = cursor.y_component()
	    dragging = true
	  }
	}
	
	exports.up = function(e, cursor){
	  can_drag = dragging = false
	}

	return exports
})