a pretty arrow

interface/src/render_svg.cpp

@@ -6,14 +6,39 @@ using namespace std;
 void Svg::rectangle(){
     _buffer << "<rect title='container' width='" << _w
             <<"' height='"<< _h
-            <<"' x='"     << _x
-            <<"' y='"     << _y
+            <<"' x='"     << _x1
+            <<"' y='"     << _y1
             <<"' fill='rgb("<<_r<<","<<_g<<","<<_b
             <<")'/>";
     print();
 }
 
 
+void Svg::line(){
+
+    _buffer << "<line title='line' x1='" << _x1
+            <<"' y1='"     << _y1
+            <<"' x2='"     << _x2
+            <<"' y2='"     << _y2
+            <<"' />";
+    print();
+}
+
+
+void Svg::triangle(){
+
+
+
+ _buffer << "<polyline title='triangle' class='triangle' points='"
+         <<        _x1 << "," << _y1
+         << " " << _x2 << "," << _y2
+         << " " << _x3 << "," << _y3
+         <<"' />";
+    print();
+
+
+}
+
 void Svg::print(){
 
     if (_buffer.str().size()>BUFFER_SIZE){
@@ -31,7 +56,25 @@ void Svg::init(const char *path){
     if (_svg_file.is_open()==false){
         std::cerr<<"unable to open file";
     }
-    _buffer <<  "<?xml version='1.0' encoding='utf-8' standalone='no'?>\n<!DOCTYPE svg PUBLIC '-//W3C//DTD SVG 20010904//EN'  'http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd'>\n<svg xmlns='http://www.w3.org/2000/svg' x='0' y='0' width='1280' height='728' id='svg2'>\n\t<style type='text/css' id='stylecss' >\n\t\trect:hover\n\t\t\t{\n\t\t\t\tfill:#8fbbd0;\n\t\t\t}\n\t</style>\n\t<desc>Rectangles</desc>\n";
+    _buffer <<  "<?xml version='1.0' encoding='utf-8' standalone='no'?>\n"
+            <<  "<!DOCTYPE svg PUBLIC '-//W3C//DTD SVG 20010904//EN'  'http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd'>\n"
+            <<  "<svg xmlns='http://www.w3.org/2000/svg' x='0' y='0' width='1280' height='728' id='svg2'>\n"
+            <<      "\t<style type='text/css' id='stylecss' >\n"
+            <<          "\t\trect:hover\n"
+            <<              "\t\t\t{\n"
+            <<              "\t\t\t\tfill:#8fbbd0;\n"
+            <<              "\t\t\t}\n"
+            <<          "\t\tline\n"
+            <<              "\t\t\t{\n"
+            <<              "\t\t\t\tfill:white;stroke:black;stroke-width:1\n"
+            <<              "\t\t\t}\n"
+            <<          "\t\t#triangle\n"
+            <<              "\t\t\t{\n"
+            <<              "\t\t\t\tfill:black;stroke:black;stroke-width:1\n"
+            <<              "\t\t\t}\n"
+            <<      "\t</style>\n"
+            <<      "\t<desc>Rectangles</desc>\n";
+
     print();
 }
 
@@ -49,20 +92,41 @@ void Svg::draw_container(const Element_pos x, const Element_pos y, const Element
     _b=0xcc;
     _w=(unsigned long)w;
     _h=(unsigned long)h;
-    _x=(unsigned long)x;
-    _y=(unsigned long)y;
+    _x1=(unsigned long)x;
+    _y1=(unsigned long)y;
     rectangle();
 }
 
+void Svg::draw_arrow(const Element_pos start_time, const Element_pos end_time, const Element_pos start_height, const Element_pos end_height){
+
+    _x1=(unsigned long)start_time;
+    _x2=(unsigned long)end_time;
+    _y1=(unsigned long)start_height;
+    _y2=(unsigned long)end_height;
+    line();
+
+
+    _x1=(unsigned long)end_time;
+    _x2=(unsigned long)end_time;
+    _x3=(unsigned long)end_time+ARROWSIZE;
+    _y1=(unsigned long)end_height+ARROWSIZE;
+    _y2=(unsigned long)end_height-ARROWSIZE;
+    _y3=(unsigned long)end_height;
+    triangle();//spike
+
+
+}
+
+
 void Svg::draw_state(const Element_pos start , const Element_pos end, const Element_count level, const Element_col r, const Element_col g, const Element_col b){
 
     _r=(unsigned char)r;
     _g=(unsigned char)g;
     _b=(unsigned char)b;
     _w=(unsigned long)(end-start);
-    _h=(unsigned long)LEVEL - 10;
-    _x=(unsigned long)start;
-    _y=(unsigned long)level*LEVEL;
+    _h=(unsigned long)LEVEL - MARGIN;
+    _x1=(unsigned long)start;
+    _y1=(unsigned long)level*LEVEL;
     rectangle();
 
 }

interface/src/render_svg.hpp

@@ -2,17 +2,18 @@
 #define RENDER_SVG
 
 
-#include <stdio.h>
 #include <iostream>
 #include <sstream>
 #include <fstream>
 
 #define BUFFER_SIZE 2048 //character number stored before flush the _buffer
 #define LEVEL 110        //distance between two containers
+#define MARGIN 10        //distance between two object
+#define ARROWSIZE 4      //spike size
 
 typedef unsigned long Element_count ;
 typedef double Element_pos;
-typedef unsigned int Element_col;
+typedef unsigned char Element_col;
 
 
 class Svg{
@@ -20,11 +21,16 @@ class Svg{
 
 private:
     std::ostringstream _buffer;
+    std::string _object_class;
     std::ofstream _svg_file;
-    unsigned int _r,_g,_b;
-    unsigned long _x,_y,_w,_h;
-    void print();
+    unsigned int _r,_g,_b;  // 0 < _r,_g,_b < 255 and displayed as int
+    unsigned long _w,_h;
+    unsigned long _x1,_y1,_x2,_y2,_x3,_y3;
+
+    inline void print();
     inline void rectangle();
+    inline void line();
+    inline void triangle();
 public:
     /*!
      * \brief SVG header buiding
@@ -56,6 +62,13 @@ public:
      * \param level refer to the container which state belongs to.
      */
     void draw_state(const Element_pos start , const Element_pos end, const Element_count level, const Element_col r, const Element_col g, const Element_col b) ;
+
+    /*!
+    * \brief Draw an arrow
+    *
+    */
+    void draw_arrow(const Element_pos start_time, const Element_pos end_time, const Element_pos start_height, const Element_pos end_height);
+
 };
 
 #endif // RENDER_SVG

interface/test/test_svg.cpp

@@ -17,6 +17,8 @@ int main()
     s.draw_state(400, 750, 2, 0xff,0xcc,33);
     s.draw_state(70, 300, 3, 0xff,0xcc,33);
 
+    s.draw_arrow(100,700,LEVEL*1,LEVEL*3);
+    s.draw_arrow(200,400,LEVEL*2,LEVEL*2);
     s.end();
 
     return 0;