diff --git a/src/graph/graph.cc b/src/graph/graph.cc
index afdcb9c..64e2ae5 100644
--- a/src/graph/graph.cc
+++ b/src/graph/graph.cc
@@ -9,21 +9,21 @@
 void Graph::svg_demo(Analyse::track_data_t track_data) {
 
 
-    auto s = SvgRect();
+    auto s = new SvgRect();
 
-    s.left = 50;
-    s.top = 80;
+    s->left = 50;
+    s->top = 80;
 
-    s.width = 100;
-    s.height = 200;
+    s->width = 100;
+    s->height = 200;
 
-    s.radius = 20;
+    s->radius = 20;
 
-    s.opacity = 0.8;
-    s.line_opacity = 0.5;
+    s->opacity = 0.8;
+    s->line_opacity = 0.5;
 
-    s.color = "blue";
-    s.line_color = "green";
+    s->color = "blue";
+    s->line_color = "green";
 
 //    printf(R"(<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="%d" height="%d">)", 1000, 1000);
 //    printf("\n");
@@ -32,21 +32,21 @@ void Graph::svg_demo(Analyse::track_data_t track_data) {
 //
 //    printf("</svg>\n");
 
-    auto l = SvgLine();
-    l.start_x = 100;
-    l.start_y = 200;
+    auto l = new SvgLine();
+    l->start_x = 100;
+    l->start_y = 200;
 
-    l.end_x = 300;
-    l.end_y = 400;
+    l->end_x = 300;
+    l->end_y = 400;
 
-    auto sg = SvgGraph();
+    auto sg = SvgGraph(1000, 2000);
 //    sg.insert(&s);
 //    sg.insert(&l);
 
-    sg.insert(std::move(s));
-    sg.insert(std::move(l));
+    sg.insert(s);
+    sg.insert(l);
 
-    sg.dump();
+    std::cout << sg.dump() << std::endl;
 
     return;
 
diff --git a/src/graph/svg/svg.cc b/src/graph/svg/svg.cc
index 098fc8b..90acabb 100644
--- a/src/graph/svg/svg.cc
+++ b/src/graph/svg/svg.cc
@@ -1,7 +1,27 @@
 #include "svg.h"
 
+#include <iostream>
+
+
+SvgGraph::~SvgGraph() {
+    for (auto *object : objects) {
+        delete object;
+    }
+}
+
+void SvgGraph::insert(SvgObject *obj) {
+    objects.emplace_back(obj);
+}
+
+std::string SvgLine::dump() const {
+    /// basic attributes of svg-line
+
+    return "<line />";
+
+}
+
 std::string SvgRect::dump() const {
-    /// basic attribute of svg-rect
+    /// basic attributes of svg-rect
     std::string xml = "<rect ";
     xml += "x=\"" + std::to_string(left) + "\" ";
     xml += "y=\"" + std::to_string(top) + "\" ";
@@ -27,44 +47,12 @@ std::string SvgRect::dump() const {
     return xml + "style=\"" + style + "\" />";
 }
 
-
-SvgGraph::~SvgGraph() {
-    for (auto &object : objects) {
-        delete object;
-    }
-}
-
-//void SvgGraph::insert(SvgObject *obj) {
-//    objects.emplace_back(obj);
-//}
-
-#include <iostream>
-
 std::string SvgGraph::dump() const {
-
-    for (auto o : objects) {
-        std::cout << o->dump() << std::endl;
+    std::string xml = R"(<svg xmlns="http://www.w3.org/2000/svg" version="1.1")";
+    xml += " width=\"" + std::to_string(width) + "\"";
+    xml += " height=\"" + std::to_string(height) + "\">\n";
+    for (const auto *object : objects) {
+        xml += "  " + object->dump() + "\n";
     }
-
-    return "svg result";
-}
-
-void SvgGraph::insert(const SvgRect &rect) {
-//void SvgGraph::insert(SvgRect rect) {
-
-    auto s = new SvgRect(rect);
-    objects.emplace_back(s);
-}
-
-void SvgGraph::insert(const SvgLine &line) {
-
-    auto l = new SvgLine(line);
-    objects.emplace_back(l);
-
-}
-
-std::string SvgLine::dump() const {
-
-    return "<line />";
-
+    return xml + "</svg>\n";
 }
diff --git a/src/graph/svg/svg.h b/src/graph/svg/svg.h
index be2651c..7808a29 100644
--- a/src/graph/svg/svg.h
+++ b/src/graph/svg/svg.h
@@ -10,6 +10,20 @@ public:
     virtual std::string dump() const = 0;
 };
 
+class SvgGraph {
+public:
+    uint64_t width;
+    uint64_t height;
+
+    ~SvgGraph();
+    std::string dump() const;
+    void insert(SvgObject *obj);
+    SvgGraph(uint64_t w, uint64_t h) : width(w), height(h) {}
+
+private:
+    std::vector<SvgObject*> objects;
+};
+
 class SvgLine : public SvgObject {
 public:
     uint64_t start_x;
@@ -42,23 +56,3 @@ public:
     ~SvgRect() override = default;
     std::string dump() const override;
 };
-
-class SvgGraph {
-public:
-
-    std::vector<SvgObject*> objects;
-
-//    void insert(SvgObject *obj);
-
-    void insert(const SvgRect &rect);
-    void insert(const SvgLine &line);
-
-//    void insert(SvgRect rect);
-//    void insert(SvgLine line);
-
-
-    std::string dump() const;
-
-    ~SvgGraph();
-
-};