📄 shadow.cpp
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////////////////////////////////////////////////////////////////////////////////
int Vision_System(int depth, // depth of scan
int direction, // direction of scan N,E,S,W
object *stuff, // objects seen in scan
int *num_objects) // number of objects seen in scan
{
// this function is rather complex. It is responsible for the vision of
// the player. It works by scanning a upside down pryamid of squares in
// front of the player. The objects within this vision window will be
// returned in the objects array along withe the number of them.
// the vision window is built up by consequtively scanning rows of blocks
// in the geometry universe along with testing the objects universe for
// instances of objects. It is sort of like ray casting, but the distance
// is irrelevant and only four directions are used. For example if the
// player was looking north and a depth of 3 was sent for the scan then the
// scan pattern would look like:
//
// .....
// ...
// P
// where 'P' is the position of player and the '.' is a scanned block
// similary a scan of depth 5 to the east would like like
// .
// ..
// ...
// ....
// ....P
// ....
// ...
// ..
// .
// note: the field of view (FOV) will always be 90 degrees
// anyway the function is basically used for the "LOOK" verb and the "GET"
// verb and I admit that the code is redundant for each case, but to merge
// it all would make it too hard to follow!
int x,y, // used to hold current universe cell location
index, // loop index
scan_level; // current level or iteration of the scan
*num_objects=0;
// which direction is vision requested in?
switch(direction)
{
case NORTH:
{
// scan like this
// .....
// ...
// P
for (y=you.y,scan_level=0; y>=(you.y-depth); y--,scan_level++)
{
for (x=you.x-scan_level; x<=you.x+scan_level; x++)
{
// x,y is test point, make sure it is within the universe
// boundaries and within the same room
if (x>=1 && x<NUM_COLUMNS-1 &&
y>=1 && x<NUM_ROWS-1 &&
universe_geometry[y][x]==universe_geometry[you.y][you.x])
{
// test to see if square has an object in it
if (universe_objects[y][x]!=' ')
{
// insert the object into object list
stuff[*num_objects].thing = universe_objects[y][x];
stuff[*num_objects].x = x;
stuff[*num_objects].y = y;
// increment the number of objects
(*num_objects)++;
} // end if an object was found
} // end if in boundaries
} // end for x
} // end for y
// return number of objects found
return(*num_objects);
} break;
case SOUTH:
{
// scan like this
// P
// ...
//.....
for (y=you.y,scan_level=0; y<=(you.y+depth); y++,scan_level++)
{
for (x=you.x-scan_level; x<=you.x+scan_level; x++)
{
// x,y is test point, make sure it is within the universe
// boundaries
if (x>=1 && x<NUM_COLUMNS-1 &&
y>=1 && x<NUM_ROWS-1 &&
universe_geometry[y][x]==universe_geometry[you.y][you.x])
{
// test to see if square has an object in it
if (universe_objects[y][x]!=' ')
{
// insert the object into object list
stuff[*num_objects].thing = universe_objects[y][x];
stuff[*num_objects].x = x;
stuff[*num_objects].y = y;
// increment the number of objects
(*num_objects)++;
} // end if an object was found
} // end if in boundaries
} // end for x
} // end for y
// return number of objects found
return(*num_objects);
} break;
case EAST:
{
// scan like this
// .
// ..
// P..
// ..
// .
for (x=you.x,scan_level=0; x<=(you.x+depth); x++,scan_level++)
{
for (y=you.y-scan_level; y<=you.y+scan_level; y++)
{
// x,y is test point, make sure it is within the universe
// boundaries
if (x>=1 && x<NUM_COLUMNS-1 &&
y>=1 && x<NUM_ROWS-1 &&
universe_geometry[y][x]==universe_geometry[you.y][you.x])
{
// test to see if square has an object in it
if (universe_objects[y][x]!=' ')
{
// insert the object into object list
stuff[*num_objects].thing = universe_objects[y][x];
stuff[*num_objects].x = x;
stuff[*num_objects].y = y;
// increment the number of objects
(*num_objects)++;
} // end if an object was found
} // end if in boundaries
} // end for y
} // end for x
// return number of objects found
return(*num_objects);
} break;
case WEST:
{
// scan like this
// .
// ..
// ..P
// ..
// .
//
for (x=you.x,scan_level=0; x>=(you.x-depth); x--,scan_level++)
{
for (y=you.y-scan_level; y<=you.y+scan_level; y++)
{
// x,y is test point, make sure it is within the universe
// boundaries
if (x>=1 && x<NUM_COLUMNS-1 &&
y>=1 && x<NUM_ROWS-1 &&
universe_geometry[y][x]==universe_geometry[you.y][you.x])
{
// test to see if square has an object in it
if (universe_objects[y][x]!=' ')
{
// insert the object into object list
stuff[*num_objects].thing = universe_objects[y][x];
stuff[*num_objects].x = x;
stuff[*num_objects].y = y;
// increment the number of objects
(*num_objects)++;
} // end if an object was found
} // end if in boundaries
} // end for y
} // end for x
// return number of objects found
return(*num_objects);
} break;
} // end switch direction
return(0);
} // end Vision_System
////////////////////////////////////////////////////////////////////////////////
int Check_For_Phrase(int phrase,int index)
{
// this function is used to test for small phrases that when extracted don't
// change the measning of a sentence for example:"look to the west" and
// "loo west" and "look to west" all mean the same thing.
// test which phrase is to be checked
switch(phrase)
{
case PHRASE_TO: // have we found the prep. "to"
{
if (sentence[index]==PREP_TO)
return(1);
} break;
case PHRASE_THE: // have we found the article "the"
{
if (sentence[index]==ART_THE)
return(1);
} break;
case PHRASE_DOWN: // have we found the prep/adj "down"
{
if (sentence[index]==PREP_DOWN)
return(1);
} break;
case PHRASE_TO_THE: // have we found the prep. phrase "to the"
{
if (sentence[index]==PREP_TO)
{
if (sentence[index+1]==ART_THE)
return(1);
else
return(0);
} // end if got "to the"
} break;
case PHRASE_DOWN_THE: // have we found the prep. phrase "down the"
{
if (sentence[index]==PREP_DOWN)
{
if (sentence[index+1]==ART_THE)
return(1);
else
return(0);
} // end if got "down the"
} break;
default:break; // there is a serious problem!
} // end switch
// we have failed
return(0);
} // end Check_For_Phrase
///////////////////////////////////////////////////////////////////////////////
void Print_Info_Strings(info_string strings[],char where)
{
// this function will print the info strings out of the sent array based
// on the the current location of the player i.e. bedroom, kitchen etc.
int index=0;
printf("\n");
// traverse list and print all string relating to this room
while(strings[index].type!='X')
{
// should this string be printed
if (strings[index].type==where)
{
printf("\n%s",strings[index].string);
} // end if this is a relevant string
// next string
index++;
} // end while
printf("\n");
} // end Print_Info_Strings
///////////////////////////////////////////////////////////////////////////////
void Introduction(void)
{
int index;
for (index=0; index<50; index++,printf("\n"));
// make the screen blue with white characters
// only works with ansi driver
printf("%c%c37;44m",27,91);
printf("\n SSSSSSSSSS H H AAAAAAAA DDDDD OOOOOOOO W W");
printf("\n S H H A A D D O O W W");
printf("\n S H H A A D D O O W W");
printf("\n S H H A A D D O O W W");
printf("\n S H H A A D D O O W W");
printf("\n SSSSSSSSSS HHHHHHHH AAAAAAAA D D O O W W");
printf("\n S H H A A D D O O W W");
printf("\n S H H A A D D O O W W W");
printf("\n S H H A A D D O O W W W");
printf("\n S H H A A D D O O W W W");
printf("\n S H H A A D D O O W W W");
printf("\n SSSSSSSSSS H H A A DDDDD OOOOOOOO WWWWWWWWW");
printf("\n ");
printf("\n L AAAAAAA NNNNNNN DDDDDD ");
printf("\n L A A N N D D ");
printf("\n L A A N N D D ");
printf("\n L A A N N D D ");
printf("\n L AAAAAAA N N D D ");
printf("\n L A A N N D D ");
printf("\n L A A N N D D ");
printf("\n L A A N N D D ");
printf("\n LLLLLLL A A N N DDDDD ");
printf("\n ");
printf("\n By Andre' LaMothe ");
while(!kbhit());
for (index=0; index<50; index++,printf("\n"));
} // end Introduction
// M A I N /////////////////////////////////////////////////////////////////////
void main(void)
{
// call up intro
Introduction();
printf("\n\nWelcome to the world of S H A D O W L A N D...\n\n\n");
// obtain users name to make game more personal
printf("\nWhat is your first name?");
scanf("%s",you.name);
// main event loop,note: it is NOT real-time
while(!global_exit)
{
// put up an input notice to user
printf("\n\nWhat do you want to do?");
// get the line of text
Get_Line(global_input);
printf("\n");
// break the text down into tokens and build up a sentence
Extract_Tokens(global_input);
// parse the verb and execute the command
Verb_Parser();
} // end main event loop
printf("\n\nExiting the universe of S H A D O W L A N D...see you later %s.\n",you.name);
// restore screen color
printf("%c%c37;40m",27,91);
} // end main
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