Arrow Keys Movement in Turbo C

A   Arrow Keys Movement in Turbo C in the C Programming Language program was written by my close friend and fellow software engineer Sir Ernel Fadriquilan. Thank you for sharing your code Sir Ernel.

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Program Listing

#include <stdio.h>

#include <string.h>

#include <alloc.h>

#include <graphics.h>

#include <stdlib.h>

#include <conio.h>

#include <bios.h>

#include <math.h>

#include <dos.h>

#define LTARROW 0x4B 

#define RTARROW 0x4D 

#define UPARROW 0x48 

#define DNARROW 0x50 

#define CR 0x0d 

#define ESC 0x1b 

#define ALT_X 0x2d 

long size = 0;

void far *buffer2 = 0;

void far *buffer1 = 0;

void draw_pixelbackground()

{

int i, xpos, ypos, color;

int xmax = getmaxx();

int ymax = getmaxy();

setbkcolor(BLUE);

setcolor(WHITE);

rectangle(0,0,xmax, ymax);

for(i = 0; i < 5000; i++)

{

xpos = rand() % xmax;

ypos = rand() % ymax;

color = rand() % 12;

putpixel(xpos, ypos, color);

}

}

void draw_object(int left, int top, int right, int bottom)

{

size = imagesize(left, top, right, bottom);

buffer1 = farmalloc(size);

buffer2 = farmalloc(size);

getimage(left, top, right, bottom, buffer1);

rectangle(left, top, right, bottom);

line(left, top, right, bottom);

line(left, bottom, right, top);

}

void move_object(int left, int top, int right, int bottom,int destx, int desty)

{

int width = right - left;

int height = bottom - top;

getimage(left, top, right, bottom, buffer2);

putimage(left, top, buffer1, COPY_PUT);

getimage(destx, desty, destx + width, desty + height, buffer1);

putimage(destx, desty, buffer2, COPY_PUT);

}

void main()

{

int grd, grm;

int key;

int x1 = 10, y1 = 30, x2 = 100, y2 = 70;

int newx, newy;

int xoffset = 10, yoffset = 5;

detectgraph(&grd,&grm);

initgraph(&grd, &grm, "");

draw_pixelbackground();

draw_object(x1, y1, x2, y2);

while(1)

{

key = bioskey(0);

if( (key & 0x00FF) > 0)

key = key & 0x00FF;

else

key = (key & 0xFF00) >> 8;

switch(key)

{

case LTARROW:

newx = x1 - xoffset;

newy = y1;

move_object(x1, y1, x2, y2, newx, newy);

x1 -= xoffset;

x2 -= xoffset;

break;

case RTARROW:

newx = x1 + xoffset;

newy = y1;

move_object(x1, y1, x2, y2, newx, newy);

x1 += xoffset;

x2 += xoffset;

break;

case DNARROW:

newx = x1;

newy = y1 + yoffset;

move_object(x1, y1, x2, y2, newx, newy);

y1 += yoffset;

y2 += yoffset;

break;

case UPARROW:

newx = x1;

newy = y1 - yoffset;

move_object(x1, y1, x2, y2, newx, newy);

y1 -= yoffset;

y2 -= yoffset;

break;

case ALT_X:

case ESC:

case CR:

closegraph();

exit(0);

}

}

}