Class to draw a tree (C++ Builder)

file - m_tree.h



#ifndef m_treeH
#define m_treeH
//---------------------------------------------------------------------------
#include <stdlib.h>
#include <time.h>
#include <vcl.h>
class draw_Tree
{
  private:
   float x1[5],x2[5],x3[5],x4[5],x5[6],x6[6],x7[6],x8[6],x9[6],
   x10[6],x11[6],x12[6];
   TForm *tf;


  public:
   draw_Tree();
   void init_Date();
   void Draw(TForm *form);
} ;


#endif


file - m_tree.cpp

#include <stdlib.h>
#include <time.h>
#include <vcl.h>
#pragma hdrstop

#include "m_tree.h"

//---------------------------------------------------------------------------

#pragma package(smart_init)

#define my_MAX 65535
draw_Tree::draw_Tree()
{
  srand(time(NULL));

}

void draw_Tree::init_Date()
{
 int i,value,temp;
 for(i=0;i<5;i++)
 {
   value=rand()%100+1;
   temp=rand()%7;
   x1[i]=(1.0*value/100.);
   if(temp<4)
    x1[i]*=-1.;
   x2[i]=(1.0*value/100.);
   if(temp<4)
    x2[i]*=-1.;
   x3[i]=(1.0*value/100.);
   if(temp<4)
    x3[i]*=-1.;
   x4[i]=(1.0*value/100.);
   if(temp<4)
   x4[i]*=-1.;
   x5[i]=(1.0*value/100.);
   if(temp<4)
   x5[i]*=-1.;
   x6[i]=(1.0*value/100.);
   if(temp<4)
    x6[i]*=-1.;
   x7[i]=(1.0*value/100.);
   if(temp<4)
   x7[i]*=-1.;
   x8[i]=(1.0*value/100.);
   if(temp<4)
    x8[i]*=-1.;
   x9[i]=(1.0*value/100.);
   if(temp<4)
   x9[i]*=-1.;
   x10[i]=(1.0*value/100.);
   if(temp<4)
    x10[i]*=-1.;
   x11[i]=(1.0*value/100.);
   if(temp<4)
   x11[i]*=-1.;
   x12[i]=(1.0*value/100.);
   if(temp<4)
    x12[i]*=-1.;

 }
}
void draw_Tree::Draw(TForm *form)
{
  int i,j,k;
  float vx_value,vy_value;

  tf=form;
  vx_value=rand()%my_MAX+1;
  vy_value=rand()%my_MAX+1;
  i=0;
  do
  {
   j=rand()%8;
   switch(j)
   {
    case 0:
    vx_value=vx_value*x1[0]+vy_value*x2[0]+x3[0];
    vy_value=vx_value*x4[0]+vy_value*x5[0]+x6[0];
    break;
    case 1:
    vx_value=vx_value*x1[1]+vy_value*x2[1]+x3[1];
    vy_value=vx_value*x4[1]+vy_value*x5[1]+x6[1];
    break;
    case 2:
    vx_value=vx_value*x1[2]+vy_value*x2[2]+x3[2];
    vy_value=vx_value*x4[2]+vy_value*x5[2]+x6[2];
    break;
    case 3:
    vx_value=vx_value*x1[3]+vy_value*x2[3]+x3[3];
    vy_value=vx_value*x4[3]+vy_value*x5[3]+x6[3];
    break;
    case 4:
    vx_value=vx_value*x7[0]+vy_value*x8[0]+x9[0];
    vy_value=vx_value*x10[0]+vy_value*x11[0]+x12[0];
    break;
    case 5:
    vx_value=vx_value*x7[1]+vy_value*x8[1]+x9[1];
    vy_value=vx_value*x10[1]+vy_value*x11[1]+x12[1];
    break;
    case 6:
    vx_value=vx_value*x7[2]+vy_value*x8[2]+x9[2];
    vy_value=vx_value*x10[2]+vy_value*x11[2]+x12[2];
    break;
    case 7:
    vx_value=vx_value*x7[3]+vy_value*x8[3]+x9[3];
    vy_value=vx_value*x10[3]+vy_value*x11[3]+x12[3];
    break;


   }
   tf->Canvas->Pixels[0.5*tf->Width+Floor(5*vx_value)]
   [0.5*tf->Height-Floor(5*vy_value)]=clGreen;
   ++i;
  }while(i<(5.*my_MAX));
}

Use class in the programm : 

void __fastcall TForm1::Button1Click(TObject *Sender)
{
 draw_Tree DRAW;
 DRAW.init_Date();
 DRAW.Draw(Form1);

}