C PROGRAM TO DEMONSTRATE GRAPHICS GAME PRESS ME BUTTON

/* C PROGRAM TO DEMONSTRATE GRAPHICS GAME PRESS ME BUTTON  */ 
/* AUTHOR : DEEPAK MAHAKALE 3RD YEAR IT SRCOEM, NAGPUR     */

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

union REGS i, o;
int left = 265, top = 250;

void initialize_graphics_mode() {
  int gd = DETECT, gm, error;

  initgraph( & gd, & gm, "C:/TC/BGI");

  error = graphresult();

  if (error != grOk) {
    perror("Error ");
    printf("Press any key to exit...\n");
    getch();
    exit(EXIT_FAILURE);
  }
}

void showmouseptr() {
  i.x.ax = 1;
  int86(0x33, & i, & o);
}

void hidemouseptr() {
  i.x.ax = 2;
  int86(0x33, & i, & o);
}

void getmousepos(int * x, int * y) {
  i.x.ax = 3;
  int86(0x33, & i, & o);

  * x = o.x.cx;
  * y = o.x.dx;
}

void draw_bar() {
  hidemouseptr();
  setfillstyle(SOLID_FILL, CYAN);
  bar(190, 180, 450, 350);
  showmouseptr();
}

void draw_button(int x, int y) {
  hidemouseptr();
  setfillstyle(SOLID_FILL, MAGENTA);
  bar(x, y, x + 100, y + 30);
  moveto(x + 5, y);
  setcolor(YELLOW);
  outtext("Press me");
  showmouseptr();
}

void draw() {
  settextstyle(SANS_SERIF_FONT, HORIZ_DIR, 2);
  outtextxy(155, 451, "www.programmingsimplified.com");
  setcolor(BLUE);
  rectangle(0, 0, 639, 450);
  setcolor(RED);
  outtextxy(160, 25, "Try to press the \"Press me\" button");
  outtextxy(210, 50, "Press escape key to exit");
  setfillstyle(XHATCH_FILL, GREEN);
  setcolor(BLUE);
  bar(1, 1, 75, 449);
  bar(565, 1, 638, 449);
  showmouseptr();
  draw_bar();
  draw_button(left, top);
}

void initialize() {
  initialize_graphics_mode();

  if (!initmouse()) {
    closegraph();
    printf("Unable to initialize the mouse");
    printf("Press any key to exit...\n");
    getch();
    exit(EXIT_SUCCESS);
  }

  draw();
}

int initmouse() {
  i.x.ax = 0;
  int86(0x33, & i, & o);
  return (o.x.ax);
}

void get_input() {
  int x, y;

  while (1) {
    getmousepos( & x, & y);

    /* mouse pointer in left of button */

    if (x >= (left - 3) && y >= (top - 3) && y <= (top + 30 + 3) && x < left) {
      draw_bar();
      left = left + 4;

      if (left > 350)
        left = 190;

      draw_button(left, top);
    }

    /* mouse pointer in right of button */
    else if (x <= (left + 100 + 3) && y >= (top - 3) && y <= (top + 30 + 3) && x > (left + 100)) {
      draw_bar();
      left = left - 4;

      if (left < 190)
        left = 350;

      draw_button(left, top);
    }

    /* mouse pointer above button */
    else if (x > (left - 3) && y >= (top - 3) && y < (top) && x <= (left + 100 + 3)) {
      draw_bar();
      top = top + 4;

      if (top > 320)
        top = 180;

      draw_button(left, top);
    }

    /* mouse pointer below button */
    else if (x > (left - 3) && y > (top + 30) && y <= (top + 30 + 3) && x <= (left + 100 + 3)) {
      draw_bar();
      top = top - 4;

      if (top < 180)
        top = 320;

      draw_button(left, top);
    }

    if (kbhit()) {
      if (getkey() == 1)
        exit(EXIT_SUCCESS);
    }
  }
}

int getkey() {
  i.h.ah = 0;
  int86(22, & i, & o);

  return (o.h.ah);
}

main() {
  initialize();

  get_input();
  return 0;
}