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#include <iostream>
#include <string>
#include <ctime>
#include "SDL2/SDL.h"
using namespace std;
/* window width and height */
const int WINDOW_WIDTH = 600;
const int WINDOW_HEIGHT = 500;
/* board width and height */
const int BOARD_WIDTH = 10;
const int BOARD_HEIGHT = 5;
/* space between board and edge of the window */
const int OFFSET = 50;
bool add_chip(int board[][BOARD_WIDTH], int col, int val, SDL_Renderer *renderer, int delay);
bool connect_four(const int x[][BOARD_WIDTH], int val);
void winning_board(const int board[][BOARD_WIDTH], SDL_Renderer *renderer, bool player_wins);
void copy_board(const int board[][BOARD_WIDTH], int new_board[][BOARD_WIDTH], int ni, int nj, int val);
int get_col(int xpos);
void draw_board(const int board[][BOARD_WIDTH], SDL_Renderer *renderer);
int main(int argc, char ** argv)
{
/* Initialize SDL variables */
SDL_Event event;
SDL_Window * window = SDL_CreateWindow("Connect Four",
SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, WINDOW_WIDTH, WINDOW_HEIGHT, 0);
SDL_Renderer * renderer = SDL_CreateRenderer(window, -1, 0);
srand(time(NULL));
SDL_RenderClear(renderer);
/* Initialize Connect Four board and draw it */
int board[BOARD_HEIGHT][BOARD_WIDTH] = {1}; // change to 0 to play
draw_board(board, renderer);
bool quit = false;
bool have_winner = false;
while (!quit)
{
SDL_WaitEvent(&event);
switch (event.type) {
case SDL_MOUSEBUTTONDOWN:
if (!have_winner && event.button.button == SDL_BUTTON_LEFT) {
/* get X value of mouse click */
int X = event.motion.x;
int col = get_col(X);
/* if click is not valid, continue until next click */
if (col == -1) break;
/* add chip to column and draw board */
add_chip(board, col, 1, renderer, 300);
draw_board(board, renderer);
/* check if player wins */
have_winner = connect_four(board, 1);
/* if player wins, display winning board */
if (have_winner) {
winning_board(board, renderer, true);
} else { // otherwise the computer will move
/* TO DO: call function so computer moves */
cout << "This is where computer goes...\n";
/* check if computer wins */
have_winner = connect_four(board, -1);
if (have_winner) {
winning_board(board, renderer, false);
}
}
}
break;
/* If player hits the 'n' key */
case SDL_KEYDOWN:
if (event.key.keysym.sym == SDLK_n) {
cout << "Player presses N" << endl;
}
break;
case SDL_QUIT:
quit = true;
break;
}
}
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
return 0;
}
bool add_chip(int board[][BOARD_WIDTH], int col, int val,
SDL_Renderer *renderer, int delay) {
/* this currently adds chip to the bottom row */
cout << "in add_chip -- this currently adds chip only to bottom row\n";
cout << "modify so chip is added to any column\n";
int i = BOARD_HEIGHT - 1; // index of last row
int j = col - 1; // column index
int b2[BOARD_HEIGHT][BOARD_WIDTH] = {0};
copy_board(board, b2, i-1, j, val);
draw_board(b2, renderer);
SDL_Delay(delay);
board[i][j] = val;
draw_board(board,renderer);
return true;
}
bool connect_four(const int x[][BOARD_WIDTH], int val) {
return false;
}
void winning_board(const int board[][BOARD_WIDTH], SDL_Renderer *renderer, bool player_wins) {
int new_board[BOARD_HEIGHT][BOARD_WIDTH] = {0};
int val = 1;
if (!player_wins) val = -1;
// Currently this randomly fills in up to 200 spots on the board, and then
// displays the original board. This must be modified to run as described
// above
int count = 0;
while (count < 200) {
int i = rand() % BOARD_HEIGHT; // select random row_index
int j = rand() % BOARD_WIDTH; // select random column_index
new_board[i][j] = val; // add chip to this position
draw_board(new_board, renderer); // draw the board
SDL_Delay(10); // quick delay
count++;
}
draw_board(board, renderer); // draw original board
}
// gets the board column from the x position on the window
// if xposition is not on board, function returns -1
int get_col(int xpos) {
if (xpos < OFFSET || xpos > WINDOW_WIDTH-OFFSET) return -1;
double chip_width = (WINDOW_WIDTH - 2*OFFSET) / BOARD_WIDTH;
xpos = xpos - OFFSET;
return xpos / chip_width + 1;
}
// draws the board; the board array contains the player chips (+1) or
// computer's chips (-1)
void draw_board(const int board[][BOARD_WIDTH], SDL_Renderer *renderer) {
SDL_Texture * texture =
SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STATIC, WINDOW_WIDTH, WINDOW_HEIGHT);
SDL_RenderClear(renderer);
double chip_width = (WINDOW_WIDTH - 2*OFFSET) / BOARD_WIDTH;
double chip_height = (WINDOW_HEIGHT - 2*OFFSET) / BOARD_HEIGHT;
Uint32 * pixels = new Uint32[WINDOW_WIDTH * WINDOW_HEIGHT];
memset(pixels, 255, WINDOW_WIDTH * WINDOW_HEIGHT * sizeof(Uint32));
SDL_UpdateTexture(texture, NULL, pixels, WINDOW_WIDTH *sizeof(Uint32));
SDL_RenderCopy(renderer, texture, NULL, NULL);
// set color to black (r,g,b) = (0,0,0)
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
// draw vertical lines
for (int x = OFFSET; x <= WINDOW_WIDTH - OFFSET; x = x + chip_width) {
SDL_RenderDrawLine(renderer, x,OFFSET, x, WINDOW_HEIGHT-OFFSET);
}
// draw horizontal lines
for (int y = OFFSET; y <= WINDOW_HEIGHT - OFFSET; y = y + chip_height) {
SDL_RenderDrawLine(renderer, OFFSET, y, WINDOW_WIDTH-OFFSET,y);
}
// color in player chips (black) or computer chips (red)
for (int i = 0; i < BOARD_HEIGHT; i++) {
for (int j = 0; j < BOARD_WIDTH; j++) {
if (board[i][j] != 0) { // there is a chip
if (board[i][j] == 1) {
// set player color to black
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
} else {
// set computer to red
SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
}
SDL_Rect rect;
int off2 = 3;
rect.x = chip_width*j + OFFSET + off2;
rect.y = chip_height*i + OFFSET + off2;
rect.h = chip_height - 2*off2;
rect.w = chip_width - 2*off2;
SDL_RenderFillRect(renderer, &rect);
}
}
}
SDL_RenderPresent(renderer);
}
// copies elements of board into new_board and assigns 'val' to
// new_board[ni][nj]
void copy_board(const int board[][BOARD_WIDTH], int new_board[][BOARD_WIDTH],
int ni,int nj,int val) {
for (int i = 0; i < BOARD_HEIGHT; i++) {
for (int j = 0; j < BOARD_WIDTH; j++) {
new_board[i][j] = board[i][j];
}
}
new_board[ni][nj] = val;
}
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