Turbo C Graphics - floodfill function

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bar3d is the function used to draw a 3D bar. It is similar to bar function but draws an 3D object by accepting two more arguments depth and topflag. It fills the front bar and does not fill the top and right 3d projection. To fill the top and right side projection, we can use floodfill function. floodfill function is used to fill with the color set by setfillstyle. It accepts a point and border color and then it fills with the desired color in all directions until it could see the border color.

 

Look at the following lines in the sample code.

 

      //draw a 3d bar

      setfillstyle(SOLID_FILL, BLUE);

      bar3d(left, top, right, bottom, 35, 1);

      // floodfill with YELLOW color

      setfillstyle(SOLID_FILL, YELLOW);

      floodfill( (left + right) / 2, top - 2, WHITE);

      // floodfill with GREEN color

      setfillstyle(SOLID_FILL, GREEN);

      floodfill( right + 2, cy, WHITE);

 

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Source Code

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#include <graphics.h>

#include <alloc.h>

#include <stdio.h>

#include <math.h>

#include <conio.h>

#include <dos.h>

#include <stdlib.h>

 

int InitGraphics()

{

      int grd, grm;

      int gresult;

      // Detect the graphics driver and mode

      detectgraph(&grd,&grm);

      // initialize the graphics mode with initgraph

      initgraph(&grd, &grm, "");

 

      gresult = graphresult();

      if(gresult != grOk)

      {

            printf(grapherrormsg(gresult));

            getch();

            return -1;

      }

 

      // set the background color

      setbkcolor(RED);

      // set the foreground color

      setcolor(WHITE);

      // draw a white color border with rectangle

      rectangle(0,0,getmaxx(),getmaxy());

      return 1;

}

 

void main()

{

      int i, x, y, c;

      int left,top,right,bottom;

      int sz;

      int margin, cx, cy;

      char msg[128];

      void far *image = 0;

 

      if(InitGraphics() == -1)

            return;

 

      margin = 200; // 200 pixel margin

      left = margin;

      top = margin;

      bottom = getmaxy() - margin;

      right = getmaxx() - margin;

      cx = (left + right) / 2;

      cy = (top + bottom) / 2;

 

      setlinestyle(DOTTED_LINE, 0, 1);

      rectangle(left, top - 35, right + 35, bottom);

      setlinestyle(SOLID_LINE, 0, 1);

      sz = imagesize(left, top - 35, right + 35, bottom);

      image = farmalloc(sz);

 

 

      //draw a 3d bar

      setfillstyle(SOLID_FILL, BLUE);

      bar3d(left, top, right, bottom, 35, 1);

      // floodfill with YELLOW color

      setfillstyle(SOLID_FILL, YELLOW);

      floodfill( (left + right) / 2, top - 2, WHITE);

      // floodfill with GREEN color

      setfillstyle(SOLID_FILL, GREEN);

      floodfill( right + 2, cy, WHITE);

 

      //draw a circle and a point

      circle(cx, cy, 5);

      putpixel(cx, cy, WHITE);

      // get and display the pixel color

      c = getpixel(cx, cy);

      sprintf(msg, "Pixel Color: %d", c);

      outtextxy(cx - 20, cy + 10, msg);

 

      // getimage

      getimage(left, top - 35, right + 35, bottom, image);

      putimage(left, bottom + 10, image, NOT_PUT);

      putimage(left, top - 170, image, COPY_PUT);

 

      getch();

      closegraph();

}

Output

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