Point all public very bad

6-cia/src/geo2d-vz.cc

@@ -6,6 +6,62 @@
 #include <cmath>
 #include <fstream>
 
+//---------------------------- class SVG
+class SVG //Singleton
+{
+ public:
+  static void line(double x0,double y0,
+                   double x1,double y1);
+ static void dot(double x0,double y0,double r=3);
+                                           // |default radius
+ private:
+  static SVG svg;  // the Singleton declared
+  static const char File[];
+  std::ofstream out;
+   SVG();
+  ~SVG();
+};
+//------------------- implementation SVG(
+const char SVG::File[]="geo2d.svg";
+
+SVG SVG::svg;  //constructor defined and initialized
+
+SVG::SVG()
+:out(File)
+{
+ out<<
+     "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n"
+     "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.0//EN\"\n"
+     "           \"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd\">\n"
+     "<svg xmlns=\"http://www.w3.org/2000/svg\"\n"
+     "     xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n"
+     "<g stroke=\"black\">\n";
+}
+
+SVG::~SVG()
+{
+ std::cout<<"figure in file '"<<File<<"'\n";
+ out<<"\n</g>\n"
+    "</svg>\n";
+}
+
+void SVG::line(double x0,double y0,double x1,double y1)
+{
+ svg.out<<"<line x1=\""<<x0<<"\" "
+                "y1=\""<<y0<<"\" "
+                "x2=\""<<x1<<"\" "
+                "y2=\""<<y1<<"\"/>\n";
+}
+
+void SVG::dot(double x0,double y0,double r)
+{
+ svg.out<<"<circle cx=\""<<x0<<"\" "
+                  "cy=\""<<y0<<"\" "
+                   "r=\""<<r<<"\"/>\n";
+}
+//------------------- implementation SVG)
+
+
 //---------------------------------------------- Point
 //                                         declaration
 class Point
@@ -20,9 +76,10 @@ class Point
                  //other cannot be changed
   
   static double distance(Point p,Point q);
- private:
-  double xc; //x-coordinate
-  double yc; //y-coordinate
+// private: Suende
+  void svg();  //draw the point
+  double xc;   //x-coordinate
+  double yc;   //y-coordinate
 };
 
 //----------------------------------------------- Line
@@ -34,6 +91,7 @@ class Line
  //               |--------------|-------------- by C++ reference
   ~Line();
  private:
+  void svg(); //draw the line
   Point pp; //by value
   Point qq; //by value
 };
@@ -45,7 +103,7 @@ Point::Point(double x,double y) //x,y parameter
 :xc(x),yc(y)    //init list:only for construtors
                 //xc=x,yc=y
 {
- std::cout<<"constructor of Point "<<xc<<","<<yc<<"\n";
+ svg();
 }
 
 Point::Point(const Point& other)
@@ -59,6 +117,12 @@ Point::~Point()
  std::cout<<"destructor of Point "<<xc<<","<<yc<<"\n";
 }
 
+void Point::svg()
+{
+// SVG::dot(xc,yc,3);
+ SVG::dot(xc,yc); //with default radius
+}
+
 double Point::distance(Point p,Point q) //is not a member of Point
 {
  return std::hypot(q.xc-p.xc,q.yc-p.yc);
@@ -85,7 +149,7 @@ double Point::distance(const Point& other) const    //is a member of Point
 Line::Line(const Point& p,const Point& q)
 :pp(p),qq(q) //copy constructor p->pp and copy constructo q->qq
 {
- std::cout<<"constructor Line\n";
+ svg();
 }
 
 Line::~Line()
@@ -93,18 +157,16 @@ Line::~Line()
  std::cout<<"destructor Line\n";
 }
 
+void Line::svg()
+{
+ SVG::line(pp.xc,pp.yc,  //x0,y0
+           qq.xc,qq.yc); //x1 y1
+}
+
 int main(int argc,char**args)
 {
- Point p(3,4); //constructor of Point 3,4
- Point q(6,8); //constructor of Point 6,8
-/*
-copy constructor of Point 3,4 see pp by value
-copy constructor of Point 6,8 see qq by value
-*/
+ Point p(150,200); //constructor of Point 3,4
+ Point q(300,400); //constructor of Point 6,8
  Line  l(p,q); //constructor Line
  return 0;
-}  //destructor Line
-   //   destructor of Point 3,4
-   //   destructor of Point 6,8
-   //destructor of Point 6,8
-   //destructor of Point 3,4
+}