void event_cycle_once()
{
bool pstate = mainloop()->running;
mainloop()->running = false;
queue_process_events(eventq(), TIMEOUT);
queue_process_events(drawq(), TIMEOUT);
uv_run(eventloop(), UV_RUN_NOWAIT);
uv_run(eventloop(), UV_RUN_ONCE);
mainloop()->running = pstate;
}
void event_init(void)
{
log_msg("INIT", "event");
uv_loop_init(eventloop());
uv_prepare_init(eventloop(), &mainloop()->event_prepare);
uv_timer_init(eventloop(), &mainloop()->children_kill_timer);
uv_signal_init(eventloop(), &mainloop()->children_watcher);
SLIST_INIT(&mainloop()->children);
eventloop()->data = eventloop();
QUEUE_INIT(&eventq()->headtail);
QUEUE_INIT(&drawq()->headtail);
mainloop()->running = false;
}
static void prepare_events(uv_prepare_t *handle)
{
log_msg("", "--event--");
if (mainloop()->running)
return;
mainloop()->running = true;
while (1) {
queue_process_events(eventq(), TIMEOUT);
queue_process_events(drawq(), TIMEOUT);
if (!mainloop_busy()) {
uv_prepare_stop(handle);
break;
}
else {
uv_run(eventloop(), UV_RUN_NOWAIT);
}
}
mainloop()->running = false;
}
void main()
{
// VARIABLE DECLARATIONS
int i=0,j=0,a,front=-1,rear=-1;
char ch,ch1;
int item;
// FUNCTION PROTOTYPE DECLARATIONS
void show();
void slidebar(int *rear,int *front);
void showqueuesize();
void slidebar();
void cpoiters();
void drawq();
void moveptrs(int *rear,int *front);
void insertq(int *rear,char c);
void deleteq(int *front);
void qdelete(int q[],int rear,int front);
void hidequeueinfo();
void shownumbers(int x1,int y1,int x2,int y2);
int initmouse();
void getmousepos(int *button,int *x,int *y);
void showmouseptr();
void restrictmouseptr(int a,int b,int c,int d);
void exitbutton(int x1,int y1,int x2,int y2,int e_x,int e_y,int xit_x,int xit_y);
void zoomin();
// CHECKING THE GRAPHICS DRIVER
int gd=DETECT,gm,maxx,maxy,x,y,button;
initgraph(&gd,&gm,"c:\\TC");
// GET THE MAXIMUM X AND Y CO ORDINATES
maxx=getmaxx();
maxy=getmaxy();
// DRAW THE BORDER FOR THE WINDOW
rectangle(0,0,maxx,maxy);
// SET THE AREA WITHIN THE SCREEN WHERE GRAPHICAL O/P DISPLAYED
setviewport(1,1,maxx-1,maxy-1,1);
// WRITE THE HEADDING
gotoxy(150,1);
settextstyle(TRIPLEX_FONT,HORIZ_DIR,3);
setcolor(WHITE);
setbkcolor(216);
settextjustify(0,2);
outtextxy(220,2," LINEAR QUEUE ");
setcolor(RED);
settextstyle(8,HORIZ_DIR,3);
outtextxy(40,35,"DEVELOPED IN 'C' : IT'S A KVSM PRODUCT");
settextstyle(0,HORIZ_DIR,0);
// INITIALIZE MOUSE,IF IT DOESN'T GET INITIALIZED CLOSE GRAPHICS MODE
if (initmouse()==0)
{
closegraph();
restorecrtmode();
printf("\nMouse Driver not installed");
exit(1);
}
// IF MOUSE DRIVER INITIALISED THEN
// RESTRICT THE MOUSE POINTER WITHIN THE COORDINATES GIVEN GIVEN BELOW
restrictmouseptr(1,57,maxx-1,maxy-1);
// SHOW THE MOUSE POINTER
showmouseptr();
// SET THE TEXT COLOR TO WHITE
setcolor(WHITE);
line(0,70,getmaxx(),70);
line(0,400,getmaxx(),400);
setcolor(14);
outtextxy(65,115,"QUEUE OPERATIONS QUEUE STATUS");
outtextxy(140,440,"Press the Key that is Highlighted or use Mouse.");
setcolor(CYAN);
line(65,125,190,125);
line(368,125,464,125);
// CALL THE SHOW FUNCTION TO DRAW THE VARIOUS BUTTONS
show();
// DRAW THE QUEUE
drawq();
// DRAW THE POINTERS THAT IS FRONT AND REAR
moveptrs(&rear,&front);
// SET THE LABEL M THAT WILL BE USED LATER FOR UNCONDITIONAL JUMP
m:
// GO ON CHECKING WHETHER A KEY IS PRESSED OR NOT
while (i==0)
{
if (kbhit())
{
ch=getche();
// CHECK IF THE KEY PRESSED IS E OR e
switch(ch)
{
case 'e':
case 'E':
{
// CALL THE FUNCTION THAT WILL BE FOR EXIT
zoomin();
}
reset:
case 'R':
case 'r':
{
// CALL THE RESET QUEUE FUNCTION
hidequeueinfo();
// CALL THE PROGRESSBAR
slidebar(&rear,&front);
// AGAIN DRAW THE QUEUE
drawq();
restrictmouseptr(1,57,maxx-1,maxy-1);
goto m;
}
queueinfo:
case 'A' :
case 'a':
{
// CALL THE FUNCTION TO GIVE INFORMATION ABOUT QUEUE
hidequeueinfo();
showqueuesize();
goto m;
}
delet:
case 'D':
case 'd':
{
// CALL THE DELETE QUEUE OPERATIONS
hidequeueinfo();
deleteq(&front);
// CHECK IF QUEUE IS EMPTY, IF SO PRINT THE MESSAGE
if(rear==-1 || front==5 ||rear<front)
{
// CLEAR THE INFO, THERE IN INFORMATION PART
hidequeueinfo();
// DISPLAY THE TEXT IN THE INFORMATION PART
outtextxy(200,430,"Queue is empty, you can't delete");
}
else
{
front=front+1;
moveptrs(&rear,&front);
}
goto m;
}
ins:
case 'I':
case 'i':
{
// HERE IS THE OPERATIONS FOR INSERTING AN ELEMENT
hidequeueinfo();
if(rear==4)
{
hidequeueinfo();
outtextxy(200,430,"Queue is full, you can't insert");
goto m;
}
// SHOWS THE NUMBERS AND CANCEL BUTTON
shownumbers(20,430,60,470);
// CHECK FOR WHAT KEY PRESSED
n:
while(j==0)
{
if (kbhit())
{
ch1=getche();
if(front==-1)
{
front=front+1;
}
switch(ch1)
{
cancel:
case 'C':
case 'c':
{
hidequeueinfo();
restrictmouseptr(1,57,maxx-1,maxy-1);
goto m;
}
zero:
case '0':
{
insertq(&rear,'0');
rear=rear+1;
moveptrs(&rear,&front);
hidequeueinfo();
restrictmouseptr(1,57,maxx-1,maxy-1);
goto m;
}
one:
case '1':
{
insertq(&rear,'1');
rear=rear+1;
moveptrs(&rear,&front);
hidequeueinfo();
restrictmouseptr(1,57,maxx-1,maxy-1);
goto m;
}
two:
case '2':
{
insertq(&rear,'2');
rear=rear+1;
moveptrs(&rear,&front);
hidequeueinfo();
restrictmouseptr(1,57,maxx-1,maxy-1);
goto m;
}
three:
case '3':
{
insertq(&rear,'3');
rear=rear+1;
moveptrs(&rear,&front);
hidequeueinfo();
restrictmouseptr(1,57,maxx-1,maxy-1);
goto m;
}
four:
case '4':
{
insertq(&rear,'4');
rear=rear+1;
moveptrs(&rear,&front);
hidequeueinfo();
restrictmouseptr(1,57,maxx-1,maxy-1);
goto m;
}
five:
case '5':
{
insertq(&rear,'5');
rear=rear+1;
moveptrs(&rear,&front);
hidequeueinfo();
restrictmouseptr(1,57,maxx-1,maxy-1);
goto m;
}
six:
case '6':
{
insertq(&rear,'6');
rear=rear+1;
moveptrs(&rear,&front);
hidequeueinfo();
restrictmouseptr(1,57,maxx-1,maxy-1);
goto m;
}
seven:
case '7':
{
insertq(&rear,'7');
rear=rear+1;
moveptrs(&rear,&front);
hidequeueinfo();
restrictmouseptr(1,57,maxx-1,maxy-1);
goto m;
}
eight:
case '8':
{
insertq(&rear,'8');
rear=rear+1;
moveptrs(&rear,&front);
hidequeueinfo();
restrictmouseptr(1,57,maxx-1,maxy-1);
goto m;
}
nine:
case '9':
{
insertq(&rear,'9');
rear=rear+1;
moveptrs(&rear,&front);
hidequeueinfo();
restrictmouseptr(1,57,maxx-1,maxy-1);
goto m;
}
default :
hidequeueinfo();
outtextxy(200,430,"Invalid Key Pressed ! Press a valid key");
delay(550);
hidequeueinfo();
shownumbers(20,430,60,470);
goto n;
}
}
else
{
//write code here to press the 0-----9 and cancel
getmousepos(&button,&x,&y);
if((button & 1)==1)
{
if(front==-1)
{
front=front+1;
}
}
if( (x>500 && x<getmaxx()-10 && y>445 && y<470) && (button & 1)==1)
{
goto cancel;
}
if( (x>20 && x<60 && y>430 && y<470) && (button & 1)==1)
{
goto zero;
}
if( (x>60 && x<100 && y>430 && y<470) && (button & 1)==1)
{
goto one;
}
if( (x>100 && x<140 && y>430 && y<470) && (button & 1)==1)
{
goto two;
}
if( (x>140 && x<180 && y>430 && y<470) && (button & 1)==1)
{
goto three;
}
if( (x>180 && x<220 && y>430 && y<470) && (button & 1)==1)
{
goto four;
}
if( (x>220 && x<260 && y>430 && y<470) && (button & 1)==1)
{
goto five;
}
if( (x>260 && x<300 && y>430 && y<470) && (button & 1)==1)
{
goto six;
}
if( (x>300 && x<340 && y>430 && y<470) && (button & 1)==1)
{
goto seven;
}
if( (x>340 && x<380 && y>430 && y<470) && (button & 1)==1)
{
goto eight;
}
if( (x>380 && x<420 && y>430 && y<470) && (button & 1)==1)
{
goto nine;
}
}
}
}
default :
hidequeueinfo();
outtextxy(220,420,"Please Press a Valid Key");
goto m;
}
}
// ELSE CONDITION FOR THE IF AFTER THE FIRST WHILE
else
{
getmousepos(&button,&x,&y);
if( (x>50 && x<200 && y<370 && y>350) && (button & 1)==1)
{
//exit button click
zoomin();
}
if( (x>50 && x<200 && y>150 && y<170) && (button & 1)==1)
{
//clicked the queueinfo button
goto queueinfo;
}
if( (x>50 && x<200 && y>200 && y<220) && (button & 1)==1)
{
//clicked the insert button
goto ins;
}
if( (x>50 && x<200 && y>250 && y<270) && (button & 1)==1)
{
//clicked the delete button
delay(500);
goto delet;
}
if( (x>50 && x<200 && y>300 && y<320) && (button & 1)==1)
{
//clicked the reset button
goto reset;
}
}
}
getche();
}
bool mainloop_busy()
{
return !(queue_empty(eventq()) && queue_empty(drawq()));
}
