From e27efee6bdfc46c3af87ff07d161ebd1a2a8a2b1 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Sun, 08 Aug 2021 02:55:58 -0400
Subject: player: Add smile

---
diff --git a/src/defs.h b/src/defs.h
index e455281..e170f57 100644
--- a/src/defs.h
+++ b/src/defs.h
@@ -45,6 +45,8 @@
 #define MF_PLAYER_SPEED      2
 #define MF_PLAYER_TURN_TIME 15
 #define MF_PLAYER_P          2
+#define MF_PLAYER_SMILE_Y    0.25
+#define MF_PLAYER_SMILE_R    0.5
 
 /* Colors */
 #define MF_COLOR_BACK_R 0xAF  /* Background color */
@@ -79,5 +81,9 @@
 #define MF_COLOR_PLYR_G 0xAF
 #define MF_COLOR_PLYR_B 0x7F
 #define MF_COLOR_PLYR_A 0xFF
+#define MF_COLOR_PSML_R 0xDF  /* Player smile color */
+#define MF_COLOR_PSML_G 0xDF
+#define MF_COLOR_PSML_B 0xDF
+#define MF_COLOR_PSML_A 0xFF
 
 #endif  /* MF_DEFS_H_ */
diff --git a/src/player.c b/src/player.c
index 9ababd4..f5d8f4c 100644
--- a/src/player.c
+++ b/src/player.c
@@ -176,10 +176,30 @@ mf_player_render(struct mf_player *p, SDL_Renderer *renderer)
 	int e   = 0;
 	int cx;
 	int cy;
+	int fx;
 	int r;
 	int x;
 	int y;
 	int i;
+	int oy;
+	int fr;
+	int hy;
+
+	cx = p->cur_x * p->cell_width + p->cell_width / 2;
+	cy = p->cur_y * p->cell_width + p->cell_width / 2;
+	switch (p->cur_dir) {
+		case MF_PLAYER_DIR_U_: cy -= p->travel; fx =  2; break;
+		case MF_PLAYER_DIR_D_: cy += p->travel; fx =  0; break;
+		case MF_PLAYER_DIR_L_: cx -= p->travel; fx = -1; break;
+		case MF_PLAYER_DIR_R_: cx += p->travel; fx =  1; break;
+		default: fx = 0; break;
+	}
+	r = p->cell_width / 2 - MF_PLAYER_P;
+	fx *= (0.0 + MF_PLAYER_TURN_TIME-p->turning) / MF_PLAYER_TURN_TIME * r;
+
+	/*
+	 * Head
+	 */
 
 	if (SDL_SetRenderDrawColor(renderer,
 				MF_COLOR_PLYR_R, MF_COLOR_PLYR_G,
@@ -190,17 +210,6 @@ mf_player_render(struct mf_player *p, SDL_Renderer *renderer)
 		e = -1;
 	}
 
-	cx = p->cur_x * p->cell_width + p->cell_width / 2;
-	cy = p->cur_y * p->cell_width + p->cell_width / 2;
-	switch (p->cur_dir) {
-		case MF_PLAYER_DIR_U_: cy -= p->travel; break;
-		case MF_PLAYER_DIR_D_: cy += p->travel; break;
-		case MF_PLAYER_DIR_L_: cx -= p->travel; break;
-		case MF_PLAYER_DIR_R_: cx += p->travel; break;
-		default: break;
-	}
-	r = p->cell_width / 2 - MF_PLAYER_P;
-
 #define _mf_player_px(X, Y) \
 	do { \
 		if (SDL_RenderDrawPoint(renderer, cx + X, cy + Y) < 0) { \
@@ -226,6 +235,46 @@ mf_player_render(struct mf_player *p, SDL_Renderer *renderer)
 
 #undef _mf_player_px
 
+	/*
+	 * Smile
+	 */
+
+	if (SDL_SetRenderDrawColor(renderer,
+				MF_COLOR_PSML_R, MF_COLOR_PSML_G,
+				MF_COLOR_PSML_B, MF_COLOR_PSML_A) < 0) {
+		SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
+				"Couldn't render player: %s",
+				SDL_GetError());
+		e = -1;
+	}
+
+	oy = r * MF_PLAYER_SMILE_Y;
+	fr = r * MF_PLAYER_SMILE_R;
+
+#define _mf_player_px(X, Y) \
+	do { \
+		hy = round(sqrt((r-0.5)*(r-0.5) - \
+					(X+fx-0.5)*(X+fx-0.5)) + 0.5); \
+		if (Y + oy < 0-hy || Y + oy > hy) continue; \
+		if (SDL_RenderDrawPoint(renderer, cx + fx + X, cy + oy + Y) \
+				< 0) { \
+			SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, \
+					"Couldn't render widget: %s", \
+					SDL_GetError()); \
+			e = -1; \
+		} \
+	} while (0)
+
+	for (x = 0, y = fr; y > x; ++x) {
+		y = round(sqrt((fr-0.5)*(fr-0.5) - (x-0.5)*(x-0.5)) + 0.5);
+		for (i = 0; i <=   y; ++i) _mf_player_px(  x,   i);
+		for (i = 0; i <=   y; ++i) _mf_player_px(0-x,   i);
+		for (i = 0; i <=   y; ++i) _mf_player_px(  i,   x);
+		for (i = 0; i >= 0-y; --i) _mf_player_px(  i,   x);
+	}
+
+#undef _mf_player_px
+
 	return e;
 }
 
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