Console Chess - BlitzCoder.net

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Socoder -> C/C++/C#/Other -> Console Chess
Thu, 07 Jun 2007, 16:59
mike_g	I have been trying to practice C++ a bit. I have to say I don't like it very much so far. With all that extra code its like a big turn that wont flush. Then again its probably just that I suck at OOP. Anyway heres my latest creation, its a console chess game. At the moment it just checks moves. I nearly have a version which tests it the king is in check or check mate and saves and loads games, but its not all up and running yet so heres an early version of it: #include <stdio.h> #include <windows.h> class piece { private: char type[2]; bool owner; short x, y; public: piece(){;} ~piece(){;} void SetOwner(bool o) {owner=o;} bool GetOwner() {return owner; } void SetX(short i) { x=i; } short GetX() { return x; } void SetY(short i) { y=i; } short GetY() { return y; } void SetXY(short a, short b) { x=a; y=b; } char GetName(char t); void SetType(char t1, char t2) { type[0]=t1; type[1]=t2; } char GetType(int i) {return type[i];} bool CheckMove(int sx, int sy, int ex, int ey, char t); bool RookMove(int sx, int sy, int ex, int ey); bool KnightMove(int sx, int sy, int ex, int ey); bool BishopMove(int sx, int sy, int ex, int ey); bool QueenMove(int sx, int sy, int ex, int ey); bool KingMove(int sx, int sy, int ex, int ey); bool PawnMove(int sx, int sy, int ex, int ey); }; class player { private: char name[20]; public: player(){;} ~player(){;} void SetName(char s) { for(int i=0; i<20; i++) { name[i] = s[i]; if(s[i] == '\0') break; } } char GetName() {return name;} }; class board { private: piece cell[8][8]; player pl[2]; short go;//Which players go it is short turn;//Turn number public: player GetPlayer(int i) { return pl[i]; } piece GetCell(int x, int y) { return cell[x][y]; } //Gets the first piece of a given kind that a player owns piece GetPiece(char type, bool player) { for(int y=0; y<8; y++) for(int x=0; x<8; x++) if(cell[x][y] != NULL) if(cell[x][y]->GetType(1)==type) return cell[x][y]; } void NewPiece(int x, int y, bool i) { cell[x][y] = new piece; cell[x][y]->SetOwner(1-i); cell[x][y]->SetXY(x, y); if(y==0 \|\| y==7) if(x==0 \|\| x==7) cell[x][y]->SetType('R', 'k'); else if(x==1 \|\| x==6) cell[x][y]->SetType('K', 't'); else if(x==2 \|\| x==5) cell[x][y]->SetType('B', 's'); else if(x==4) cell[x][y]->SetType('K', 5); else cell[x][y]->SetType('Q', 6); else cell[x][y]->SetType('P', 'n'); } board() { int x, y; go=0; turn=1; for(y=0; y<2; y++) pl[y] = new player; for(y=0; y<8; y++) for(x=0; x<8; x++) cell[x][y]=NULL; for(y=0; y<2; y++) for(x=0; x<8; x++) NewPiece(x, y, false); for(y=6; y<8; y++) for(x=0; x<8; x++) NewPiece(x, y, true); } ~board(){;} void DrawBoard(); void DrawCell(int x, int y); bool GetOwner(int x, int y) { return cell[x][y]->GetOwner(); } void PlayerSetup(); void TurnText() { printf("Turn: %i %s\n", turn, GetPlayer(go)->GetName()); } bool MakeMove(); int ValidateLocation(char term_a, char term_b); void EndGo() { if(go==0){go=1;} else{go=0; turn++;} } short GetGo() { return go; } }; HANDLE h = GetStdHandle ( STD_OUTPUT_HANDLE ); WORD wOldColorAttrs; CONSOLE_SCREEN_BUFFER_INFO csbiInfo; board b; int main() { //SetConsoleScreenBufferSize(h GetConsoleScreenBufferInfo(h, &csbiInfo); wOldColorAttrs = csbiInfo.wAttributes; SetConsoleTextAttribute ( h, 8 ); bool quit=false; bool check; b.PlayerSetup(); //MAIN LOOP while(quit == false) { check=true; while(check==true) { b.DrawBoard(); b.TurnText(); check=b.MakeMove(); getchar(); system("CLS"); } b.EndGo(); system("CLS"); } return 0; } // Get name from second character of type tag char* piece::GetName(char t) { int n=0; if(t=='k') n=1; else if(t=='t') n=2; else if(t=='s') n=3; else if(t==6) n=4; else if(t==5) n=5; else if(t=='n') n=6; static char name[] = { "Error", "Rook", "Knight", "Bishop", "Queen", "King", "Pawn" }; return name[n]; } void board::PlayerSetup() { char temp[20]; printf("Enter name for player 1: "); gets(temp); GetPlayer(0)->SetName(temp); printf("Enter name for player 2: "); gets(temp); GetPlayer(1)->SetName(temp); getchar(); system("CLS"); } void board::DrawBoard() { for(int y=0; y<18; y++) for(int x=0; x<26; x++) if(y==0) if(x==25) printf(" \n"); else if(x%3==2) putchar(65+(x/3)); else putchar(' '); else if (y==1) if(x==0) putchar(' '); else if(x==1) putchar(218); else if(x==25) printf("%c\n", 191); else if(x%3==1) putchar(194); else putchar(196); else if(y==17) if(x==0) putchar(' '); else if(x==1) putchar(192); else if(x==25) printf("%c\n", 217); else if(x%3==1) putchar(193); else putchar(196); else if(y%2==1) if(x==0) putchar(' '); else if(x==1) putchar(195); else if(x==25) printf("%c\n", 180); else if(x%3==1) putchar(197); else putchar(196); else if (x==0) putchar(48+(y/2)); else if(x==25) printf("%c\n", 179); else if(x%3==1) putchar(179); else if(x%3==2) DrawCell(x/3, (y/2)-1); } void board::DrawCell(int x, int y) { int i; bool own; if(cell[x][y]==NULL) //Empty Cell { if(x%2==0 && y%2==0 \|\| x%2==1 && y%2==1) SetConsoleTextAttribute ( h, BACKGROUND_BLUE \| 0 ); else SetConsoleTextAttribute ( h, BACKGROUND_GREEN \| 0 ); printf(" "); } else //There is a piece in the Cell { own=GetOwner(x, y); if(own == true)//Check owner colour if(x%2==0 && y%2==0 \|\| x%2==1 && y%2==1)//Check tile colour SetConsoleTextAttribute ( h, BACKGROUND_BLUE \| 8 ); else SetConsoleTextAttribute ( h, BACKGROUND_GREEN \| 8 ); else if(x%2==0 && y%2==0 \|\| x%2==1 && y%2==1) SetConsoleTextAttribute ( h, BACKGROUND_BLUE \| 0 ); else SetConsoleTextAttribute ( h, BACKGROUND_GREEN \| 0 ); putchar(cell[x][y]->GetType(0)); putchar(cell[x][y]->GetType(1)); } SetConsoleTextAttribute ( h, 8 ); } bool board::MakeMove() { char temp[100]; int xa, ya, xb, yb, i; char t, t2; printf("Move Piece From: "); gets(temp); ya=ValidateLocation(temp[0], temp[1]); if(ya==-1) { printf("Location Not On The Board."); return 1; } xa=ya%8; ya=ya/8; if(cell[xa][ya]==NULL) { printf("There is no piece to move there."); return 1; } else if(GetOwner(xa, ya) != go) { printf("That piece does not belong to you."); return 1; } t=cell[xa][ya]->GetType(1);//Get The type printf("Move %s to:", cell[xa][ya]->GetName(t));//Get The name gets(temp); yb=ValidateLocation(temp[0], temp[1]); if(yb==-1) { printf("Location Not On The Board."); return 1; } xb=yb%8; yb=yb/8; if(cell[xa][ya]->CheckMove(xa, ya, xb, yb, t) == true) { printf("Invalid Move"); return 1; } if(cell[xb][yb] != NULL) { if(GetOwner(xb, yb) == go) { printf("You Cant Take Your Own Piece."); return 1; } //If Piece belongs to opponent t2=cell[xb][yb]->GetType(1);//Get The type printf("You take your opponents %s", cell[xb][yb]->GetName(t2)); } delete cell[xb][yb]; //Delete the taken piece cell[xb][yb]=cell[xa][ya]; //Put Piece in Cell Moved To cell[xa][ya]=NULL; //Clear cell moved from cell[xb][yb]->SetXY(xb, yb); //Set new co-ords for piece return 0; } //Returns Y8 + X, or -1 for invlaid move location int board::ValidateLocation(char term_a, char term_b) { if(term_a > 96 && term_a < 105) term_a-=32; if(term_b > 96 && term_b < 105) term_b-=32; if(term_a > 48 && term_a < 57) if(term_b > 64 && term_b < 73) return ((term_a-49)8)+(term_b-65); else return -1; else if(term_b > 48 && term_b < 57) if(term_a > 64 && term_a < 73) return ((term_b-49)8)+(term_a-65); else return -1; else return -1; } bool piece::CheckMove(int sx, int sy, int ex, int ey, char tz) { if(tz=='k' && RookMove(sx, sy, ex, ey)==true)return true; else if(tz=='t' && KnightMove(sx, sy, ex, ey)==true)return true; else if(tz=='s' && BishopMove(sx, sy, ex, ey)==true)return true; else if(tz==6 && QueenMove(sx, sy, ex, ey)==true)return true; else if(tz==5 && KingMove(sx, sy, ex, ey)==true)return true; else if(tz=='n' && PawnMove(sx, sy, ex, ey)==true)return true; } bool piece::RookMove(int sx, int sy, int ex, int ey) { if(sx==ex && sy!=ey)//Moves Y but not X if(sy < ey) //Moving Down for(int y=sy+1; y<ey; y++)//Check path for obstructions if(b.GetCell(sx, y) != NULL) //If Obstruction on path return 1; if(sy > ey) //Moving Up for(int y=ey+1; y<sy; y++)//Check path for obstructions if(b.GetCell(sx, y) != NULL) //If Obstruction on path return 1; if(sy==ey && sx!=ex)//Moves X but not Y if(sx < ex) //Moving Right for(int x=sx+1; x<ex; x++) if(b.GetCell(x, sy) != NULL) return 1; if(sx > ex) //Moving Left for(int x=ex+1; x<sx; x++) if(b.GetCell(x, sy) != NULL) return 1; if(sx!=ex && sy!=ey \|\| sx==ex && sy==ey)//Moves Both X and Y or neither then Invalid return 1; return 0; } bool piece::KnightMove(int sx, int sy, int ex, int ey) { if(sx==ex-1 \|\| sx==ex+1) if(sy==ey-2 \|\| sy==ey+2) return false; else return true; else if(sy==ey-1 \|\| sy==ey+1) if(sx==ex-2 \|\| sx==ex+2) return false; else return true; else return true; } bool piece::BishopMove(int sx, int sy, int ex, int ey) { int dx=sx-ex; int dy=sy-ey; if(dx < 0)dx=-dx;//Make the difference absolute if(dy < 0)dy=-dy; if(dx != dy) return 1; //If not diagonal then invalid if(dx == 0) return 1; //If not moved then invalid //Check for obstructions if(sx < ex && ey < sy) //Up and Right for(int m=1; m<dx; m++) if(b.GetCell(sx+m, sy-m) != NULL) //printf("X: %i Y: %i\n", sx+m, sy-m); return 1; if(sx < ex && ey > sy)//Down and Right for(int m=1; m<dx; m++) if(b.GetCell(sx+m, sy+m) != NULL) return 1; if(sx > ex && ey < sy)//Up and Left for(int m=1; m<dx; m++) if(b.GetCell(sx-m, sy-m) != NULL) return 1; if(sx > ex && ey > sy)//Down and Left for(int m=1; m<dx; m++) if(b.GetCell(sx-m, sy+m) != NULL) return 1; return 0; } bool piece::QueenMove(int sx, int sy, int ex, int ey) { if(RookMove(sx, sy, ex, ey)==true && BishopMove(sx, sy, ex, ey)==true) return 1; else return 0; } bool piece::KingMove(int sx, int sy, int ex, int ey) { if(sx==ex-1 \|\| sx==ex+1 \|\| sx==ex) if(sy==ey-1 \|\| sy==ey+1 \|\| sy==ey) if(sx==ex && sy==ey)//If Not Moved return 1; else return 0; return 1; } bool piece::PawnMove(int sx, int sy, int ex, int ey) { int mod, jmp=0; if(b.GetGo()==0) mod= 1; else mod=-1; if((sy==6 && ey==4) \|\| (sy==1 && ey==3)) jmp=1; if(sy==ey+mod \|\| (sy=ey+mod+mod && jmp==1)) if(sx==ex)//Move Forward if(b.GetCell(ex, ey) != NULL)//If Blocked return 1; else return 0; else if((sx==ex-1 \|\| sx==ex+1) && jmp==0) if(b.GetCell(ex, ey) != NULL)//If Piece to take return 0; else return 1; else return 1; return 1; } --v Oh yeah and it only runs on windows systems. I might change that for DOS tho
Thu, 07 Jun 2007, 22:11
JL235	I've not really used C++, and so what I'm gonna say is based on programming and learning with Java. One of the most important aspects of Object-Oriented programming is about abstraction, to help 'decouple' your code and so make it far simpler to use. One idea after just looking at your code, is that could make a Piece class with a 'checkmove' method (which in Java I would make abstract so the Piece class could not be used). Then subclasses the Piece with Bishop/King/Queen/etc, classes and simply override the 'checkMove' for each (this would be forced in Java if the method in Piece was abstract) with the correct move checking method for that class. When you create the pieces you can then store them as Piece, even though they are actually of the Queen/King/Rook/etc class. This is called 'polymorphism'. This means when you select a piece (or move it or whatever happens) it will simply run it's 'checkMove' function, rather then having to find and run it's associated 'KightMove', 'QueenMove', etc. This is a far better way to design the program. You then shouldn't need to set it's type either as each piece can set it's own type upon creation.
Fri, 08 Jun 2007, 03:16
mike_g	That sounds like a good idea, I'll see if I can set it up like that. I just had to re-write a lot of the program because I had the players lurking in between the board and pieces, which was causing all kinds of problems. I guess once I get the hang of how to use objects a bit better C++ will become more fun to code in.
Fri, 08 Jun 2007, 03:57
JL235	Object-oriented programming is much more then just defining classes and methods, it's also about how to design and structure a program in the object-oriented sense (which isn't just 'making everything and object'). That's far harder then people think. You ought check out your local library for any programming books on designing programs. It'd come in handy, if just for the experience of trying out new and different techniques. Another thing I'd like to point out is that you check your Pieces 'type' a lot in your code. You shouldn't be doing this as it's bad practice. Maybe you could store what side they are on, if they are black or white. You should try to only couple your game to the Piece class and not the subclasses (apart from when they are created for which you could make a PieceGenerator class, making it the only class coupled to the individual pieces).