putpixel example in c

Header file:

    graphics.h

Synopsis:

      void putpixel (int x, int y, int color);

     

Description:

     putpixel() plots a pixel using the given color at the given point (x, y).

putpixel function in c graphics

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  #include <stdio.h>
  #include <conio.h>
  #include <graphics.h>
  #include <math.h>
  #include <dos.h>

  int main() {
        /* request auto detection */
        int gdriver = DETECT, gmode, err;
        int i, x1, y1, x2, y2, dX, dY, steps;
        float x, y, xI, yI;

        /* initialize graphic mode */
        initgraph(&gdriver, &gmode, "C:/TURBOC3/BGI");
        err = graphresult();

        if (err != grOk) {
                /* error occurred */
                printf("Graphic Error: %s\n",
                                grapherrormsg(err));
                getch();
                return 0;
        }

        /* draw line from (0, 0) to x-axis & y-axis maximum */
        x1 = y1 = 0;
        x2 = getmaxx(), y2 = getmaxy();

        dX = x2 - x1;
        dY = y2 - y1;

        x = x1, y = y1;

        steps = abs(dX) > abs(dY) ? dX : dY;

        xI = (1.0 * dX) / steps;
        yI = (1.0 * dY) / steps;

        putpixel((int) x, (int) y, WHITE);

        /* find the x and y successors and plot the pixels */

        for (i = 0; i < steps; i++) {

                x = x + xI;

                y = y + yI;

                /* put a pixel at the given postion(x, y) */

                putpixel((int) x, (int) y, WHITE);

                /* sleep for 50 milliseconds */

                delay(50);

        }

        /* deallocate memory allocated for graphic screen */

        closegraph();

        return 0;

  }

Output: (putpixel built-in function in c graphics.h)

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