diff --git a/src/graph/graph.cc b/src/graph/graph.cc
index cd13391..90b05ab 100644
--- a/src/graph/graph.cc
+++ b/src/graph/graph.cc
@@ -1,4 +1,5 @@
 #include "graph.h"
+#include "common.h"
 
 #include <list>
 #include <iostream>
@@ -69,6 +70,14 @@ void Graph::svg_demo(Analyse::track_data_t track_data) {
     printf(R"(<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="%ld" height="%ld">)", MAIN_WIDTH, MAIN_HEIGHT);
     printf("\n");
 
+//    SvgCase test = SvgCase();
+//    test.width = BLOCK_LENGTH;
+//    test.gap = BLOCK_GAP;
+//    test.left = 50;
+//    test.top = 100;
+//    test.code = layer_data[0][0].code;
+//    test.render();
+
     for (uint32_t i = 0; i < layer_data.size(); ++i) {
 
         uint64_t CASE_Y = CASE_GAP_Y * (i + 1) + CASE_HEIGHT * i;
@@ -81,8 +90,16 @@ void Graph::svg_demo(Analyse::track_data_t track_data) {
             uint64_t CASE_X = CASE_GAP_X * (j + 1) + CASE_WIDTH * j + left_offset;
 //            printf("(%ld, %ld, %ld, %ld)\n", CASE_Y, CASE_X, CASE_WIDTH, CASE_HEIGHT);
 
-            printf(R"(  <rect x="%ld" y="%ld" width="%ld" height="%ld" style="fill:pink;stroke-width:1;stroke:blue"/>)", CASE_X, CASE_Y, CASE_WIDTH, CASE_HEIGHT);
-            printf("\n");
+//            printf(R"(  <rect x="%ld" y="%ld" width="%ld" height="%ld" style="fill:pink;stroke-width:1;stroke:blue"/>)", CASE_X, CASE_Y, CASE_WIDTH, CASE_HEIGHT);
+//            printf("\n");
+
+            SvgCase tmp = SvgCase();
+            tmp.width = BLOCK_LENGTH;
+            tmp.gap = BLOCK_GAP;
+            tmp.left = CASE_X;
+            tmp.top = CASE_Y;
+            tmp.code = layer_data[i][j].code;
+            tmp.render();
 
         }
 
@@ -92,3 +109,79 @@ void Graph::svg_demo(Analyse::track_data_t track_data) {
 
 
 }
+
+void SvgRect::to_xml() const {
+    // TODO: return std::string
+    printf(R"(<rect x="%ld" y="%ld" width="%ld" height="%ld" style="fill:pink;stroke-width:1;stroke:blue"/>)", left, top, width, height);
+    printf("\n");
+}
+
+void SvgCase::render() const {
+
+    std::string result;
+
+    uint64_t raw_code = code;
+
+//    std::cout << "start rander" << std::endl;
+
+    auto tmp = SvgRect();
+
+    tmp.left = left;
+    tmp.top = top;
+    tmp.width = width * 4 + gap * 5;
+    tmp.height = width * 5 + gap * 6;
+//    std::cout << "main" << std::endl;
+    tmp.to_xml();
+
+    for (int addr = 0; raw_code; ++addr, raw_code >>= 3) {
+
+        uint32_t block_x = addr % 4;
+        uint32_t block_y = (addr - block_x) / 4;
+
+        switch (raw_code & 0b111) {
+            case B_1x1:
+
+                tmp.top = width * block_y + gap * (block_y + 1) + top;
+                tmp.left = width * block_x + gap * (block_x + 1) + left;
+                tmp.height = width;
+                tmp.width = width;
+//                std::cout << "1x1" << std::endl;
+                tmp.to_xml();
+
+                break;
+            case B_1x2:
+
+                tmp.top = width * block_y + gap * (block_y + 1) + top;
+                tmp.left = width * block_x + gap * (block_x + 1) + left;
+                tmp.height = width;
+                tmp.width = width * 2 + gap;
+//                std::cout << "1x2" << std::endl;
+                tmp.to_xml();
+
+                break;
+            case B_2x1:
+
+                tmp.top = width * block_y + gap * (block_y + 1) + top;
+                tmp.left = width * block_x + gap * (block_x + 1) + left;
+                tmp.height = width * 2 + gap;
+                tmp.width = width;
+//                std::cout << "2x1" << std::endl;
+                tmp.to_xml();
+
+                break;
+            case B_2x2:
+
+                tmp.top = width * block_y + gap * (block_y + 1) + top;
+                tmp.left = width * block_x + gap * (block_x + 1) + left;
+                tmp.height = width * 2 + gap;
+                tmp.width = width * 2 + gap;
+//                std::cout << "2x2" << std::endl;
+                tmp.to_xml();
+
+                break;
+            default:
+                continue;
+        }
+    }
+
+}
diff --git a/src/graph/graph.h b/src/graph/graph.h
index 6608a29..dc9f5c7 100644
--- a/src/graph/graph.h
+++ b/src/graph/graph.h
@@ -2,7 +2,33 @@
 
 #include "analyse.h"
 
+class SvgRect {
+public:
+    uint64_t top;
+    uint64_t left;
+    uint64_t width;
+    uint64_t height;
+
+    // TODO: color options
+
+    void to_xml() const;
+
+};
+
+class SvgCase {
+public:
+
+    uint64_t code;
+
+    uint64_t top = 0;
+    uint64_t left = 0;
 
+    uint32_t gap = 4;
+    uint32_t width = 12;
+
+    void render() const;
+
+};
 
 class Graph {