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#include <stdlib.h>
#include <time.h>
#include <stdbool.h>
#include "raylib.h"
/*
* each cube is 1 unit, so FACT is used as a scale factor for the size of the
* screen
*/
#define WIDTH 10
#define HEIGHT 22
#define VIS_HEIGHT 20
#define FACT 40
/* since the game only moves on a block per block basis, no smoothness is
* necessary, so the only thing FPS controls is how fast the blocks move left
* and right, due to how often it polls */
#define FPS 30
#define CYAN CLITERAL(Color){ 0, 255, 255, 255 }
typedef struct Vector2Int {
int x, y;
} Vector2Int;
typedef struct Tetromino {
Color colour;
Vector2Int pos[4]; // position of 4 cubes making the tetromino
} Tetromino;
void Draw2DGrid(Color grid[WIDTH][HEIGHT]);
int
main(void){
int const width = WIDTH * FACT, height = HEIGHT * FACT,
vis_height = VIS_HEIGHT * FACT;
Color grid[WIDTH][HEIGHT]; // if colour is WHITE, the position is empty
int interval = FPS, count, i, j;
// zero init so that prev_trmno can be set later
Tetromino cur_trmno = {.pos = {0}}, prev_trmno;
bool gen_trmno = true;
srand(time(NULL));
// clear screen
for (i = 0; i < WIDTH; i++)
for (j = 0; j < HEIGHT; j++)
grid[i][j] = WHITE;
InitWindow(width, height, "retris");
SetTargetFPS(FPS);
for (count = 0; !WindowShouldClose(); count++) {
if (gen_trmno) {
switch (rand() % 7) {
case 0: // I-tetromino
cur_trmno.colour = CYAN;
for (i = 0; i < 4; i++) {
cur_trmno.pos[i].x = WIDTH / 2;
cur_trmno.pos[i].y = i;
}
break;
case 1: // O-tetromino
cur_trmno.colour = YELLOW;
for (i = 0; i < 4; i += 2) {
cur_trmno.pos[i].x = WIDTH / 2;
cur_trmno.pos[i].y = 1 - i / 2;
cur_trmno.pos[i+1].x = WIDTH / 2 + 1;
cur_trmno.pos[i+1].y = 1 - i / 2;
}
break;
case 2: // L-tetromino
cur_trmno.colour = ORANGE;
for (i = 0; i < 3; i++) {
cur_trmno.pos[i].x = WIDTH / 2;
cur_trmno.pos[i].y = i;
}
cur_trmno.pos[3].x = WIDTH / 2 + 1;
cur_trmno.pos[3].y = 2;
break;
case 3: // J-tetromino
cur_trmno.colour = DARKBLUE;
for (i = 0; i < 3; i++) {
cur_trmno.pos[i].x = WIDTH / 2;
cur_trmno.pos[i].y = i;
}
cur_trmno.pos[3].x = WIDTH / 2 - 1;
cur_trmno.pos[3].y = 2;
break;
case 4: // T-tetromino
cur_trmno.colour = PURPLE;
for (i = 0; i < 3; i++) {
cur_trmno.pos[i].x = WIDTH / 2 - 1 + i;
cur_trmno.pos[i].y = 1;
}
cur_trmno.pos[3].x = WIDTH / 2;
cur_trmno.pos[3].y = 0;
break;
case 5: // S-tetromino
cur_trmno.colour = GREEN;
for (i = 0; i < 4; i++) {
cur_trmno.pos[i].x = WIDTH / 2 + (i < 2 ? i - 1 : i - 2);
cur_trmno.pos[i].y = i < 2 ? 1 : 0;
}
break;
case 6: // Z-tetromino
cur_trmno.colour = RED;
for (i = 0; i < 4; i++) {
cur_trmno.pos[i].x = WIDTH / 2 + (i < 2 ? i : 2 - i);
cur_trmno.pos[i].y = i < 2 ? 1 : 0;
}
break;
}
gen_trmno = false;
}
prev_trmno = cur_trmno;
// KEY CHECKING
if (count >= (IsKeyDown(KEY_DOWN) ? FPS/30 : interval)) {
count = 0;
for (i = 0; i < 4; i++)
cur_trmno.pos[i].y++;
}
if (IsKeyDown(KEY_RIGHT))
for (i = 0; i < 4; i++)
cur_trmno.pos[i].x++;
else if (IsKeyDown(KEY_LEFT))
for (i = 0; i < 4; i++)
cur_trmno.pos[i].x--;
// for debug purposes only
if (IsKeyPressed(KEY_G))
gen_trmno = true;
// redraw current tetromino position
for (i = 0; i < 4; i++)
grid[prev_trmno.pos[i].x][prev_trmno.pos[i].y] = WHITE;
for (i = 0; i < 4; i++)
grid[cur_trmno.pos[i].x][cur_trmno.pos[i].y] = cur_trmno.colour;
BeginDrawing();
Draw2DGrid(grid);
#ifdef DEBUG
char *str1, *str2;
asprintf(&str1, "block0: x: %d y: %d", cur_trmno.pos[0].x,
cur_trmno.pos[0].y);
for (i = 1; i < 4; i++) {
asprintf(&str2, "%s\nblock%d: x: %d y: %d", str1, i,
cur_trmno.pos[i].x, cur_trmno.pos[i].y);
free(str1);
str1 = str2;
}
DrawText(str2, 0, 20, 16, BLACK);
free(str2);
#endif
EndDrawing();
}
CloseWindow();
return 0;
}
void
Draw2DGrid(Color grid[WIDTH][HEIGHT]){
int i, j;
for (i = 0; i < WIDTH; i++) {
for (j = 0; j < HEIGHT; j++) {
DrawRectangle(i*FACT, j*FACT, FACT, FACT, grid[i][j]);
}
}
for (i = 0; i <= WIDTH; i++)
DrawLine(i*FACT, 0, i*FACT, HEIGHT*FACT, LIGHTGRAY);
for (i = 0; i <= HEIGHT; i++)
DrawLine(0, i*FACT, WIDTH*FACT, i*FACT, LIGHTGRAY);
}
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