diff --git a/desktop/sources/index.html b/desktop/sources/index.html
index c7544dd..0128060 100644
--- a/desktop/sources/index.html
+++ b/desktop/sources/index.html
@@ -9,6 +9,7 @@
     <script type="text/javascript" src="scripts/render.js"></script>
     <script type="text/javascript" src="scripts/interface.js"></script>
     <script type="text/javascript" src="scripts/tool.js"></script>
+    <script type="text/javascript" src="scripts/generator.js"></script>
 
     <script type="text/javascript" src="scripts/picker.js"></script>
 
diff --git a/desktop/sources/scripts/generator.js b/desktop/sources/scripts/generator.js
new file mode 100644
index 0000000..e7321e9
--- /dev/null
+++ b/desktop/sources/scripts/generator.js
@@ -0,0 +1,75 @@
+function Generator(layer)
+{
+  this.layer = layer;
+
+  function operate(layer,offset,scale)
+  {
+    var l = copy(layer)
+
+    for(k1 in l){
+      var seg = l[k1];
+      for(k2 in seg.vertices){
+        seg.vertices[k2].x += offset.x
+        seg.vertices[k2].x *= scale
+        seg.vertices[k2].y += offset.y
+        seg.vertices[k2].y *= scale
+      }
+    }
+
+    return l;
+  }
+
+  function render(segment)
+  {
+    var type = segment.type;
+    var vertices = segment.vertices;
+    var html = '';
+    var skip = 0;
+
+    for(id in vertices){
+      if(skip > 0){ skip -= 1; continue; }
+      
+      var vertex = vertices[id]
+      var next = vertices[parseInt(id)+1]
+      var after_next = vertices[parseInt(id)+2]
+
+      if(id == 0){
+        html += `M${vertex.x},${vertex.y} `
+      }
+      else if(type == "line"){ 
+        html += `L${vertex.x},${vertex.y} `;  
+      }
+      else if(type == "arc_c"){ 
+        html += next ? `A${next.x - vertex.x},${next.y - vertex.y} 0 0,1 ${next.x},${next.y} ` : ''; 
+      }
+      else if(type == "arc_r"){ 
+        html += next ? `A${next.x - vertex.x},${next.y - vertex.y} 0 0,0 ${next.x},${next.y} ` : ''; 
+      }
+      else if(type == "bezier"){ 
+        html += next && after_next ?`Q${next.x},${next.y} ${after_next.x},${after_next.y} ` : ''; 
+        skip = 1
+      }
+      else{ 
+        console.warn(`unknown type:${type}`)
+      }
+    }
+  
+    return html
+  }
+
+  this.toString = function(offset = {x:0,y:0}, scale = 1)
+  {
+    var s = ""
+
+    var layer = operate(this.layer,offset,scale)
+
+    for(id in layer){
+      var seg = layer[id];
+      s += `${render(seg)}`
+    }
+
+    return s.trim()
+  }
+
+  function copy(data){ return data ? JSON.parse(JSON.stringify(data)) : []; }
+}
\ No newline at end of file
diff --git a/desktop/sources/scripts/guide.js b/desktop/sources/scripts/guide.js
index 6f53d85..e09f507 100644
--- a/desktop/sources/scripts/guide.js
+++ b/desktop/sources/scripts/guide.js
@@ -109,15 +109,16 @@ function Guide()
 
   this.draw_paths = function()
   {
-    var paths = dotgrid.tool.paths_mod({x:15,y:15},scale)
-    this.draw_path(paths,0)
+    var path = new Generator(dotgrid.tool.layer()).toString({x:15,y:15},scale)
+    var style = dotgrid.tool.style()
+
+    this.draw_path(path,style)
   }
 
-  this.draw_path = function(paths,id)
+  this.draw_path = function(path,style)
   {
-    var style = dotgrid.tool.styles[id]
     var ctx = this.el.getContext('2d');
-    var p = new Path2D(paths[id]);
+    var p = new Path2D(path);
 
     ctx.strokeStyle = style.color;
     ctx.lineWidth = style.thickness * scale;