add help text

1 files changed, 45 insertions, 1 deletions

diff --git a/src/sdl/draw.c b/src/sdl/draw.c
index aa16bca..6616ce7 100644
--- a/src/sdl/draw.c
+++ b/src/sdl/draw.c
@@ -334,7 +334,12 @@ draw_moves_text(
 ) {
   // build text
   char buf[256];
-  snprintf(buf, sizeof(buf), "Moves: %zu", draw_ctx->ctx->num_moves);
+  snprintf(
+    buf, sizeof(buf),
+    "Moves: %zu%s",
+    draw_ctx->ctx->num_moves,
+    sok_ctx_is_done(draw_ctx->ctx) ? " (Won!)" : ""
+  );
 
   // get renderer height
   int renderer_h;
@@ -355,6 +360,44 @@ draw_moves_text(
   draw_text(draw_ctx, buf, &rect);
 }
 
+#define DELIM "     "
+
+static void
+draw_help_text(
+  draw_ctx_t * const draw_ctx
+) {
+  // build text
+  char buf[256];
+  snprintf(
+    buf, sizeof(buf),
+    "%sU: Undo" DELIM "R: Reset" DELIM "S: Solve" DELIM "Q: Quit",
+    sok_ctx_is_done(draw_ctx->ctx) ? "Space: Next Level" DELIM : ""
+  );
+
+  // get renderer height
+  int renderer_w, renderer_h;
+  if (SDL_GetRendererOutputSize(draw_ctx->renderer, &renderer_w, &renderer_h)) {
+    die("SDL_GetRendererOutputSize(): %s", SDL_GetError());
+  }
+
+  // get text size
+  int text_w, text_h;
+  if (TTF_SizeText(draw_ctx->font, buf, &text_w, &text_h)) {
+    die("TTF_SizeText(): %s", TTF_GetError());
+  }
+
+  // build rect
+  const SDL_Rect rect = {
+    renderer_w - text_w - 10,
+    renderer_h - text_h - 10,
+    text_w,
+    text_h,
+  };
+
+  // draw text
+  draw_text(draw_ctx, buf, &rect);
+}
+
 static void
 set_bg_won_color(
   draw_ctx_t * const draw_ctx
@@ -399,6 +442,7 @@ draw(
   // render text
   draw_level_text(draw_ctx);
   draw_moves_text(draw_ctx);
+  draw_help_text(draw_ctx);
 
     // flip
   SDL_RenderPresent(draw_ctx->renderer);