function Interface()
{
  this.el = document.createElement("div");
  this.el.id = "interface";

  this.el.appendChild(this.menu_el = document.createElement("div"));
  this.menu_el.id = "menu";

  this.is_visible = true;
  this.zoom = false;

  this.start = function()
  {
    document.getElementById("app").appendChild(this.el);
    this.el.appendChild(dotgrid.picker.el);
    
    var html = ""
    var tools = {
      line: ["line","M60,60 L240,240","A"],
      arc_c: ["arc clockwise","M60,60 A180,180 0 0,1 240,240","S"],
      arc_r: ["arc reverse","M60,60 A180,180 0 0,0 240,240","D"],
      bezier: ["bezier","M60,60 Q60,150 150,150 Q240,150 240,240","F"],
      close: ["close","M60,60 A180,180 0 0,1 240,240  M60,60 A180,180 0 0,0 240,240","Z"],

      linecap: ["linecap","M60,60 L60,60 L180,180 L240,180 L240,240 L180,240 L180,180","Q"],
      linejoin: ["linejoin","M60,60 L120,120 L180,120  M120,180 L180,180 L240,240","W"],
      thickness: ["thickness","M120,90 L120,90 L90,120 L180,210 L210,180 Z M105,105 L105,105 L60,60 M195,195 L195,195 L240,240"],
      
      mirror: ["mirror","M60,60 L60,60 L120,120 M180,180 L180,180 L240,240 M210,90 L210,90 L180,120 M120,180 L120,180 L90,210","E"],
      fill: ["fill","M60,60 L60,150 L150,150 L240,150 L240,240 Z","R"],
      color: ["color","M150,60 A90,90 0 0,1 240,150 A-90,90 0 0,1 150,240 A-90,-90 0 0,1 60,150 A90,-90 0 0,1 150,60","G"],
    }

    for(id in tools){
      var tool = tools[id];
      var shortcut = tool[2];
      html += `<svg id="${id}" ar="${id}" title="${tool[0].capitalize()}" viewBox="0 0 300 300" class="icon"><path id="${id}_path" class="icon_path" d="${tool[1]}"/>${id == "depth" ? `<path class="icon_path inactive" d=""/>` : ""}<rect ar="${id}" width="300" height="300" opacity="0"><title>${id.capitalize()}${shortcut ? '('+shortcut+')' : ''}</title></rect></svg>`
    }
    this.menu_el.innerHTML = html
  }

  this.prev_operation = null;

  this.refresh = function(force = false)
  {
    if(this.prev_operation == dotgrid.cursor.operation && force == false){ return; }

    document.getElementById("line").className.baseVal = !dotgrid.tool.can_cast("line") ? "icon inactive" : "icon";
    document.getElementById("arc_c").className.baseVal = !dotgrid.tool.can_cast("arc_c") ? "icon inactive" : "icon";
    document.getElementById("arc_r").className.baseVal = !dotgrid.tool.can_cast("arc_r") ? "icon inactive" : "icon";
    document.getElementById("bezier").className.baseVal = !dotgrid.tool.can_cast("bezier") ? "icon inactive" : "icon";
    document.getElementById("close").className.baseVal = !dotgrid.tool.can_cast("close") ? "icon inactive" : "icon";
    
    document.getElementById("thickness").className.baseVal = dotgrid.tool.layer().length < 1 ? "icon inactive" : "icon";
    document.getElementById("linecap").className.baseVal = dotgrid.tool.layer().length < 1 ? "icon inactive" : "icon";
    document.getElementById("linejoin").className.baseVal = dotgrid.tool.layer().length < 1 ? "icon inactive" : "icon";
    document.getElementById("mirror").className.baseVal = dotgrid.tool.layer().length < 1 ? "icon inactive" : "icon";
    document.getElementById("fill").className.baseVal = dotgrid.tool.layer().length < 1 ? "icon inactive" : "icon";
    
    document.getElementById("color").children[0].style.fill = dotgrid.tool.style().color;
    document.getElementById("color").children[0].style.stroke = dotgrid.tool.style().color;
    document.getElementById("color").className.baseVal = "icon";

    // Mirror
    if(dotgrid.tool.style().mirror_style == 0){ document.getElementById("mirror_path").setAttribute("d","M60,60 L60,60 L120,120 M180,180 L180,180 L240,240 M210,90 L210,90 L180,120 M120,180 L120,180 L90,210") }
    else if(dotgrid.tool.style().mirror_style == 1){ document.getElementById("mirror_path").setAttribute("d","M60,60 L240,240 M180,120 L210,90 M120,180 L90,210") }
    else if(dotgrid.tool.style().mirror_style == 2){ document.getElementById("mirror_path").setAttribute("d","M210,90 L210,90 L90,210 M60,60 L60,60 L120,120 M180,180 L180,180 L240,240") }
    else if(dotgrid.tool.style().mirror_style == 3){ document.getElementById("mirror_path").setAttribute("d","M60,60 L60,60 L120,120 L120,120 L180,120 M120,150 L120,150 L180,150 M120,180 L120,180 L180,180 L180,180 L240,240 ") }
    else if(dotgrid.tool.style().mirror_style == 4){ document.getElementById("mirror_path").setAttribute("d","M120,120 L120,120 L120,120 L180,120 M120,150 L120,150 L180,150 M120,180 L120,180 L180,180 L180,180 L180,180 L240,240 M120,210 L120,210 L180,210 M120,90 L120,90 L180,90 M60,60 L60,60 L120,120  ") }

    this.prev_operation = dotgrid.cursor.operation;
  }

  this.toggle = function()
  {
    this.is_visible = this.is_visible ? false : true;
    this.el.className = this.is_visible ? "visible" : "hidden";
  }
}