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ORIGED1.C

+#include<graphics.h>
+#include<dos.h>
+#include<math.h>
+#include<stdlib.h>
+#include<stdio.h>
+#include<conio.h>
+
+union REGS i, o;
+int leftcolor[15];
+
+
+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);
+}
+
+
+int get_key()
+{
+   union REGS i,o;
+
+   i.h.ah = 0;
+   int86(22,&i,&o);
+
+   return ( o.h.ah );
+}
+
+void draw_color_panel()
+{
+   int left, top, c, color;
+
+   left = 120;
+   top = 436;
+
+   color = getcolor();
+   setcolor(GREEN);
+   rectangle(4,431,635,457);
+   setcolor(WHITE);
+   settextstyle(TRIPLEX_FONT,0,2);
+   outtextxy(30,431,"Colors : ");
+
+   for( c = 1 ; c <= 16 ; c++ )
+   {
+      setfillstyle(SOLID_FILL, c);
+      bar(left, top, left+16, top+16);
+      leftcolor[c-1] = left;
+      left += 26;
+   }
+
+   setcolor(color);
+}
+
+void draw_shape_panel()
+{
+   int left, top, c, color;
+
+   left = 529;
+   top = 45;
+
+   color = getcolor();
+   setcolor(GREEN);
+   rectangle(525,40,633,255);
+
+   setcolor(CYAN);
+   for( c = 1 ; c <= 7 ; c++ )
+   {
+
+      rectangle(left, top, left+100, top+25);
+      top += 30;
+   }
+   setcolor(WHITE);
+   outtextxy(535,45,"Fill Rect.");
+   outtextxy(535,75,"Line");
+   outtextxy(535,105,"Dot");
+   outtextxy(535,135,"Ellipse");
+   outtextxy(535,165,"Pencil");
+   outtextxy(535,195,"Rectangle");
+   outtextxy(535,225,"Erase All");
+   setcolor(color);
+}
+
+void change_color(int x, int y)
+{
+   int c;
+
+   for( c = 0 ; c <= 13 ; c++ )
+   {
+      if( x > leftcolor[c] && x < leftcolor[c+1] && y > 437 && y < 453 )
+	 setcolor(c+1);
+      if( x > leftcolor[14] && x < 505 && y > 437 && y < 453 )
+	 setcolor(WHITE);
+   }
+}
+
+char change_shape(int x, int y)
+{
+   if ( x > 529 && x < 625 && y > 45 && y < 70 )
+      return 'b';
+   else if ( x > 529 && x < 625 && y > 75 && y < 100 )
+      return 'l';
+   else if ( x > 529 && x < 625 && y > 105 && y < 130 )
+      return 'p';
+   else if ( x > 529 && x < 625 && y > 135 && y < 160 )
+      return 'e';
+   else if ( x > 529 && x < 625 && y > 165 && y < 190 )
+      return 'f';
+   else if ( x > 529 && x < 625 && y > 195 && y < 220 )
+      return 'r';
+   else if ( x > 529 && x < 625 && y > 225 && y < 250 )
+      return 'c';
+      return 'm';
+}
+
+void showmouseptr()
+{
+   i.x.ax = 1;
+   int86(0x33,&i,&o);
+}
+
+void hidemouseptr()
+{
+   i.x.ax = 2;
+   int86(0x33,&i,&o);
+}
+
+void restrictmouseptr( int x1, int y1, int x2, int y2)
+{
+   i.x.ax = 7;
+   i.x.cx = x1;
+   i.x.dx = x2;
+   int86(0x33,&i,&o);
+
+   i.x.ax = 8;
+   i.x.cx = y1;
+   i.x.dx = y2;
+   int86(0x33,&i,&o);
+}
+
+void getmousepos(int *button,int *x,int *y)
+{
+   i.x.ax = 3;
+   int86(0x33,&i,&o);
+
+   *button = o.x.bx;
+   *x = o.x.cx;
+   *y = o.x.dx;
+}
+
+main()
+{
+   int gd = DETECT,gm;
+
+   int maxx,maxy,x,y,button,prevx,prevy,temp1,temp2,key,color;
+   char ch = 'f' ;
+   int i,signdx,signdy;
+   float len,abx,aby,dx,dy,xx,yy;
+
+   initgraph(&gd,&gm,"..//BGI");
+
+   maxx = getmaxx();
+   maxy = getmaxy();
+
+   setcolor(WHITE);
+   rectangle(0,0,maxx,maxy);
+
+   setcolor(YELLOW);
+   settextstyle(SANS_SERIF_FONT,HORIZ_DIR,2);
+   outtextxy(maxx/2-120,maxy-23,"*** DRAWING WINDOW ***");
+
+   draw_color_panel();
+   draw_shape_panel();
+
+   setviewport(1,1,maxx-1,maxy-1,1);
+
+   restrictmouseptr(1,1,maxx-1,maxy-1);
+   showmouseptr();
+   setcolor(BLUE);
+   setfillstyle(SOLID_FILL,15);
+   bar(2,2,518,427);
+   setviewport(60,60,500,400,1);
+
+   while(1)
+   {
+      if(kbhit())
+      {
+	 key = get_key();
+
+	 if( key == 1 )
+	 {
+	    closegraph();
+	    exit(0);
+	 }
+      }
+
+      getmousepos(&button,&x,&y);
+
+      if( button == 1 )
+      {
+	 if( x > 4 && x < 635 && y > 431 && y < 457 )
+	    change_color( x, y );
+	 else if ( x > 529 && x < 625 && y > 40 && y < 250 )
+	     ch = change_shape( x, y );
+
+	 temp1 = x ;
+	 temp2 = y ;
+
+	 if ( ch == 'f' )
+	 {
+	    hidemouseptr();
+	    while( button == 1 )
+	    {
+	       line(temp1,temp2,x,y);
+	       temp1 = x;
+	       temp2 = y;
+	       getmousepos(&button,&x,&y);
+	    }
+	    showmouseptr();
+	 }
+
+	 while( button == 1)
+	    getmousepos(&button,&x,&y);
+
+	 /* to avoid interference of mouse while drawing */
+	// hidemouseptr();
+
+	 if( ch == 'p')
+	    putpixel(x,y,getcolor());
+
+	 else if ( ch == 'b' )
+	 {
+	    setfillstyle(SOLID_FILL,getcolor());
+	    bar(temp1,temp2,x,y);
+	 }
+
+	 else if ( ch == 'l')
+	 {  // line(temp1,temp2,x,y);
+
+    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]={50,100,300,200},arry[10]={60,200,300,100};
+    //int gd=DETECT,gm;
+    //clrscr();
+    //printf("enter the order of the curve:");
+    //scanf("%d",&n);
+    n = 3;
+    //printf("enter the control points:");
+    //for(i=0;i<=n;i++)
+    //{
+    //	scanf("%d %d",&arrx[i],&arry[i]);
+    //}
+    //initgraph(&gd,&gm,"..\\bgi");
+    //setcolor(GREEN);
+    setcolor(RED);
+    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);
+ // }
+
+    //closegraph();
+    //restorecrtmode();
+
+		if(temp1>x)
+		abx=temp1-x;
+		else
+		abx=x-temp1;
+
+		if(temp2>y)
+		aby=temp2-y;
+		else
+		aby=y-temp2;
+
+		if(abx>=aby)
+		len=abx;
+		else
+		len=aby;
+
+		dx=(temp1-x)/len;
+		if(abx>0)
+		signdx=1;
+		else
+		signdx=-1;
+
+		dy=(temp2-y)/len;
+		if(aby>0)
+		signdy=1;
+		else
+		signdy=-1;
+
+		xx=x+(0.5)*signdx;
+		yy=y+(0.5)*signdy;
+
+
+		for(i=1;i<=len;i++)
+		{
+		   putpixel(xx,yy,getcolor());
+		   xx+=dx;
+		   yy+=dy;
+		}
+
+	 }
+	 else if ( ch == 'e')
+	    ellipse(temp1,temp2,0,360,abs(x-temp1),abs(y-temp2));
+	 else if ( ch == 'r' )
+	    rectangle(temp1,temp2,x,y);
+	 else if ( ch == 'c' )
+	 {
+	    ch = 'f';          // setting to freehand drawing
+	    clearviewport();
+	    color = getcolor();
+	    setcolor(WHITE);
+	    setfillstyle(SOLID_FILL,15);
+	    bar(2,2,518,427);
+	    setcolor(color);
+	 }
+
+	 showmouseptr();
+      }
+   }
+}
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