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feat: draw game grid with colors

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This commit is contained in:
Fredrik Robertsen
2025-02-01 20:50:32 +01:00
parent 1f35e4ebd1
commit afc8cf41a3
1 changed files with 54 additions and 13 deletions
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src/main.c
+54 -13
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@@ -12,8 +12,15 @@ static int grid_height = 24;
enum TILES { EMPTY, SNAKE, FRUIT }; enum TILES { EMPTY, SNAKE, FRUIT };
typedef enum DIRECTION { LEFT, RIGHT, UP, DOWN } DIRECTION;
typedef struct State {
int *grid;
DIRECTION player_face;
} State;
void log_game_grid(int *game_grid) { void log_game_grid(int *game_grid) {
char *buf = SDL_malloc(sizeof(char) * grid_width * 2 + 1); char *buf = SDL_malloc(sizeof(char) * grid_width * 2);
for (int i = 0; i < grid_height; i++) { for (int i = 0; i < grid_height; i++) {
for (int j = 0; j < grid_width; j++) { for (int j = 0; j < grid_width; j++) {
buf[2 * j] = '0' + game_grid[i * grid_width + j]; buf[2 * j] = '0' + game_grid[i * grid_width + j];
@@ -25,6 +32,14 @@ void log_game_grid(int *game_grid) {
SDL_free(buf); SDL_free(buf);
} }
void set_grid_at(int *grid, int row, int col, int value) {
grid[row * grid_width + col] = value;
}
int get_grid_at(int *grid, int row, int col) {
return grid[row * grid_width + col];
}
SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[]) { SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[]) {
if (!SDL_Init(SDL_INIT_VIDEO)) { if (!SDL_Init(SDL_INIT_VIDEO)) {
SDL_Log("Couldn't initialize SDL: %s", SDL_GetError()); SDL_Log("Couldn't initialize SDL: %s", SDL_GetError());
@@ -40,15 +55,18 @@ SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[]) {
int *game_grid = SDL_malloc(sizeof(int) * grid_width * grid_height); int *game_grid = SDL_malloc(sizeof(int) * grid_width * grid_height);
for (int i = 0; i < grid_height; i++) { for (int i = 0; i < grid_height; i++) {
for (int j = 0; j < grid_width; j++) { for (int j = 0; j < grid_width; j++) {
game_grid[i * grid_width + j] = EMPTY; set_grid_at(game_grid, i, j, EMPTY);
} }
} }
game_grid[16 * grid_width + 12] = SNAKE;
game_grid[12 * grid_width + 4] = FRUIT;
game_grid[5 * grid_width + 18] = FRUIT;
*appstate = game_grid; set_grid_at(game_grid, 12, 16, SNAKE);
log_game_grid(*appstate); set_grid_at(game_grid, 4, 12, FRUIT);
set_grid_at(game_grid, 18, 5, FRUIT);
State *state = SDL_malloc(sizeof(State));
state->grid = game_grid;
state->player_face = UP;
*appstate = state;
return SDL_APP_CONTINUE; return SDL_APP_CONTINUE;
} }
@@ -63,14 +81,37 @@ SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event) {
} }
SDL_AppResult SDL_AppIterate(void *appstate) { SDL_AppResult SDL_AppIterate(void *appstate) {
const double now = ((double)SDL_GetTicks()) / 1000.0; State *stateptr = appstate;
const float red = (float)(0.5 + 0.5 * SDL_sin(now)); int *game_grid = stateptr->grid;
const float green = (float)(0.5 + 0.5 * SDL_sin(now + SDL_PI_D * 2 / 3));
const float blue = (float)(0.5 + 0.5 * SDL_sin(now + SDL_PI_D * 4 / 3));
SDL_SetRenderDrawColorFloat(renderer, red, green, blue, SDL_SetRenderDrawColorFloat(renderer, 0, 0, 0, SDL_ALPHA_OPAQUE_FLOAT);
SDL_ALPHA_OPAQUE_FLOAT);
SDL_RenderClear(renderer); SDL_RenderClear(renderer);
SDL_FRect rect;
rect.w = (float)width / grid_width;
rect.h = (float)height / grid_height;
for (int i = 0; i < grid_height; i++) {
for (int j = 0; j < grid_width; j++) {
switch (get_grid_at(game_grid, i, j)) {
case EMPTY:
SDL_SetRenderDrawColorFloat(renderer, 0, 0, 0,
SDL_ALPHA_OPAQUE_FLOAT);
break;
case SNAKE:
SDL_SetRenderDrawColorFloat(renderer, 255, 255, 255,
SDL_ALPHA_OPAQUE_FLOAT);
break;
case FRUIT:
SDL_SetRenderDrawColorFloat(renderer, 255, 0, 0,
SDL_ALPHA_OPAQUE_FLOAT);
break;
}
rect.x = j * rect.w;
rect.y = i * rect.h;
SDL_RenderFillRect(renderer, &rect);
}
}
SDL_RenderPresent(renderer); SDL_RenderPresent(renderer);
return SDL_APP_CONTINUE; return SDL_APP_CONTINUE;