//This code is Written in ---> C++ Builder
//---------------------------------------------------------------------------
#include <vcl\vcl.h>
#pragma hdrstop
#include "ellipse.h"
//---------------------------------------------------------------------------
#pragma resource "*.dfm"
TForm1 *Form1;
void eplot(float, float);
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
/*float xc=StrToFloat(Edit1->Text);
float yc=StrToFloat(Edit2->Text);*/
float rx=StrToFloat(Edit3->Text);
float ry=StrToFloat(Edit4->Text);
float x=0,y=ry;
eplot(x,y);
float p1=(ry*ry)-(rx*rx*ry)+((rx*rx)/4);
while((2*ry*ry*x)<=(2*rx*rx*y))
{
x++;
if(p1<=0)
{
p1=p1+(2*ry*ry*x)+(ry*ry);
}
else
{
y--;
p1=p1+(2*ry*ry*x)+(ry*ry)-(2*rx*rx*y);
}
eplot(x,y);
}
float p2=(rx*rx)+(2*ry*ry*rx)+((ry*ry)/4);
x++;
y++;
while(y>=0)
{
y--;
if(p2>0)
{
p2=p2+(rx*rx)-(2*rx*rx*y);
}
else
{
x=x++;
p2=p2+(2*ry*ry*x)-(2*rx*rx*y)+(rx*rx);
}
eplot(x,y);
}
}
//---------------------------------------------------------------------------
void eplot(float x, float y)
{
float xc=StrToFloat(Form1->Edit1->Text);
float yc=StrToFloat(Form1->Edit2->Text);
Form1->Image1->Canvas->Pixels[xc+x][yc-y]=clRed;
Form1->Image1->Canvas->Pixels[xc-x][yc+y]=clRed;
Form1->Image1->Canvas->Pixels[xc+x][yc+y]=clRed;
Form1->Image1->Canvas->Pixels[xc-x][yc-y]=clRed;
}
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