Category : C++ Source Code
Archive : IDIOMS.ZIP
Filename : FVIDEO2.C
Output of file : FVIDEO2.C contained in archive : IDIOMS.ZIP
/* Advanced C++ Programming Styles and Idioms */
/* James O. Coplien */
/* All rights reserved. */
#include
#include
#include
#include "curses.h"
struct Scope { Scope *parent; virtual char *ScopeName() = 0; };
#define LocalScope(function) \
struct name2(function,LocalScope):public Scope { \
char *ScopeName() { return "function"; } \
name2(function,LocalScope)(Scope *p) { parent = p; } public
#define EndLocalScope } local(this)
#define EndOuterScope } local(0)
#define Parent(type,c) ((name2(type,LocalScope)*)_Parent("type",c))
inline Scope *_Parent(const char * type, Scope *c)
{
register Scope *s = c;
while(s && strcmp(s->ScopeName(), type)) s = s->parent;
if (!s) cerr << "couldn't find scope " << type << endl;
return s;
}
void main()
{
LocalScope(BallGame):
void DrawSides() {
for(int i = 0; i < 66; i++) mvaddch(0, i, 'S');
for(i = 0; i < 13; i++) {
mvaddch(i, 0, 'S');
mvaddch(i, 65, 'S');
}
leftWall = 0;
rightWall = 65;
}
struct Ball {
int yposition, xposition;
int yspeed, xspeed;
Ball() {
yposition = 6;
xposition = 33;
yspeed = 1;
xspeed = 1;
}
} ball;
struct Bat {
int yposition, position, length, xspeed;
Bat() { position = 40;
yposition = 11;
length = 4;
xspeed = 0;
}
} bat;
void DrawBat() {
for (int i = bat.position; i < bat.position + bat.length; i++) {
mvaddch(bat.yposition, i, 'b');
}
}
void EraseBat() {
for (int i = bat.position; i < bat.position + bat.length; i++) {
mvaddch(bat.yposition, i, ' ');
}
}
short leftWall, rightWall;
int score;
void DrawWall() {
for(int i = 0; i < 66; i++) {
mvaddch(3, i, 'W');
mvaddch(4, i, 'W');
mvaddch(5, i, 'W');
}
}
char ballIsInPlay() {
return ball.xposition < rightWall &&
ball.xposition > leftWall &&
ball.yposition <= bat.yposition;
}
void PlayGame() {
LocalScope(PlayGame):
char key; // from keyboard
short ballsLeft;
void PlayABall() {
LocalScope(PlayABall):
void CheckBallPosition() {
PlayGameLocalScope *p = Parent(PlayGame, this);
BallGameLocalScope *p2 = Parent(BallGame, p);
int &y = p2->ball.yposition;
int &x = p2->ball.xposition;
if (x <= p2->leftWall+1 ||
x >= p2->rightWall-1) {
p2->ball.xspeed = -p2->ball.xspeed;
}
if (y <= 0) {
p2->ball.yspeed = -p2->ball.yspeed;
}
char c = mvinch(y + p2->ball.yspeed,
x + p2->ball.xspeed);
switch (c) {
case 'W':
mvaddch(y + p2->ball.yspeed,
x + p2->ball.xspeed,
' ');
p2->score++;
case 'b':
p2->ball.yspeed = -p2->ball.yspeed;
p2->ball.xspeed = p2->bat.xspeed;
break;
}
}
void MoveBall() {
PlayGameLocalScope *p = Parent(PlayGame, this);
BallGameLocalScope *p2 = Parent(BallGame, p);
mvaddch(p2->ball.yposition,
p2->ball.xposition, ' ');
p2->ball.xposition += p2->ball.xspeed;
p2->ball.yposition += p2->ball.yspeed;
mvaddch(p2->ball.yposition,
p2->ball.xposition, 'O');
}
void MoveBat(char key) {
LocalScope(MoveBat):
void MoveLeft(Bat& bat) {
PlayABallLocalScope *p = Parent(PlayABall, this);
PlayGameLocalScope *p2 = Parent(PlayGame, p);
Parent(BallGame, p2)->EraseBat();
if (bat.position > Parent(BallGame, p2)->leftWall) {
bat.position--;
}
Parent(BallGame, p2)->DrawBat();
}
void MoveRight(Bat& bat) {
PlayABallLocalScope *p = Parent(PlayABall, this);
PlayGameLocalScope *p2 = Parent(PlayGame, p);
Parent(BallGame, p2)->EraseBat();
if (bat.position < Parent(BallGame, p2)->rightWall - bat.length) {
bat.position++;
}
Parent(BallGame, p2)->DrawBat();
}
EndLocalScope;
PlayGameLocalScope *p = Parent(PlayGame, this);
switch (key) {
case 'l':
local.MoveLeft(Parent(BallGame, p)->bat);
Parent(BallGame, p)->bat.xspeed = -1;
break;
case 'r':
local.MoveRight(Parent(BallGame, p)->bat);
Parent(BallGame, p)->bat.xspeed = 1;
break;
default:
break;
}
}
EndLocalScope;
while (Parent(BallGame, this)->ballIsInPlay()) {
local.CheckBallPosition();
local.MoveBall();
refresh();
key = getch();
local.MoveBat(key);
}
}
EndLocalScope;
local.ballsLeft = 4;
while (local.ballsLeft > 0) {
refresh();
local.key = getch();
local.PlayABall();
--local.ballsLeft;
}
}
EndOuterScope;
int bestScore = 0;
initscr();
cbreak();
noecho();
local.DrawSides();
local.DrawBat();
for (;;) {
local.score = 0;
local.DrawWall();
local.PlayGame();
if (local.score > bestScore) {
bestScore = local.score;
}
cout << "best score is " << bestScore << "\n";
}
}
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