Turbo C Graphics - getpixel function

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putpixel is the function used to plot of pixel in the given location (x,y) and in the given color. getpixel is the function used to get the pixel color in the specified location .

 

The possible color values are from 0 - 15 BLACK, BLUE, GREEN, CYAN, RED, MAGENTA, BROWN, LIGHTGRAY, DARKGRAY, LIGHTBLUE, LIGHTGREEN, LIGHTCYAN, LIGHTRED, LIGHTMAGENTA, YELLOW, WHITE and BLINK (128).

 

Look at the following lines in the sample code.

 

      //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);

 

 

 

 

Back to Turbo C Graphics Index

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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