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BEZ.C

+
+#include <graphics.h>
+#include <conio.h>
+#include <stdio.h>
+
+double bez(double t,int p[],int a,int b)
+{
+    if(a==b)
+	return p[a];
+    else
+	return (1-t)*bez(t,p,a,b-1)+t*bez(t,p,a+1,b);
+}
+
+void main(){
+    double step,i,t;
+    float size;
+    int x0=10,n,y0=10,x1=100,y1=200,x2=300,y2=200,x3=100,y3=100,x,y;
+    int arrx[10],arry[10];
+    int gd=DETECT,gm;
+    clrscr();
+    printf("enter the order of the curve:");
+    scanf("%d",&n);
+    printf("enter the control points:");
+    for(i=0;i<=n;i++)
+    {
+	scanf("%d %d",&arrx[i],&arry[i]);
+    }
+    initgraph(&gd,&gm,"..\\bgi");
+    setcolor(GREEN);
+    step=500;
+    size=1.0/(double)step;
+    moveto(arrx[0],480-arry[0]);
+    for(i=1;i<step;i++){
+	t=size*(double)i;
+	x=bez(t,arrx,0,n);
+	y=bez(t,arry,0,n);
+	lineto(x,480-y);
+    }
+    setcolor(CYAN);
+    moveto(arrx[0],480-arry[0]);
+    for(i=0;i<=n;i++)
+    {
+	lineto(arrx[i],480-arry[i]);
+    }
+  //  lineto(arrx[0],480-arry[0]);
+  for(i=0;i<=n;i++)
+  {
+	 putpixel(arrx[i],480-arry[i],YELLOW);
+  }
+    getch();
+    closegraph();
+    restorecrtmode();
+}