int i,j,e;
   float x,y,p_x,p_y,temp,xx[11],yy[11],mm[11],sum,p_sum;
   Form1->Canvas->Pen->Color=clBlack;//軸色
   Form1->Canvas->MoveTo(100,300);Form1->Canvas->LineTo(450,300);//橫軸
   Form1->Canvas->MoveTo(300,50);Form1->Canvas->LineTo(300,400);//縱軸
   Form1->Canvas->TextOut(x+150,-y+304,"-1");
   Form1->Canvas->TextOut(x+290,-y+304,"0");
   Form1->Canvas->TextOut(x+440,-y+304,"1");
   Form1->Canvas->Pen->Color=clBlue;//線色
   Form1->Canvas->MoveTo(x+20,-y+255);Form1->Canvas->LineTo(x+50,-y+255);//橫線
   Form1->Canvas->TextOut(x+50,-y+250,"被逼近函數(shù)");//文字?jǐn)⑹?   Form1->Canvas->Pen->Color=clRed;//線色
   Form1->Canvas->MoveTo(x+20,-y+210);Form1->Canvas->LineTo(x+50,-y+210);
   Form1->Canvas->TextOut(x+50,-y+200,"分段線性插值插值");

   Form1->Canvas->Pen->Color=clBlue;//曲線顏色
   x=-1.0,y=1/(1+25*x*x);
   p_x=x*150+300,p_y=-y*150+300;
   Form1->Canvas->MoveTo(p_x,p_y);
   for (x=-1.0;x<=1.0;)
   {
       y=1/(1+25*x*x);
       p_x=x*150+300,p_y=-y*150+300;
       Form1->Canvas->LineTo(p_x,p_y);
       x+=0.0001;
   }


   Form1->Canvas->Pen->Color=clRed;
   x=-1.0;
   for(i=0;i<=10;i++)
   {
       yy[i]=1/(1+25*x*x);
       xx[i]=x;
       x+=0.2;
   }
   x=-1.0,y=1/(1+25*x*x);
   p_x=x*150+300,p_y=-y*150+300;
   Form1->Canvas->MoveTo(p_x,p_y);
   for(e=0;e<=1000;e++)
   {
          for(j=1;j<=10;j++)
          {
             if(xx[j-1]<x&&x<xx[j])
               sum=yy[j-1]*((x-xx[j])/(xx[j-1]-xx[j]))+yy[j]*((x-xx[j-1])/(xx[j]-xx[j-1]));
          }
      p_x=x*150+300,p_y=-sum*150+300;
      Form1->Canvas->LineTo(p_x,p_y);
      x+=0.002;
   }