From 62ca2886e943d3d6deed5fe6502092d19f16bad8 Mon Sep 17 00:00:00 2001
From: KikooDX <kikoodx@protonmail.com>
Date: Wed, 23 Sep 2020 15:56:49 +0200
Subject: [PATCH] Single screen level now use fixed camera.

---
 levels/create_demo.lua |  2 +-
 src/camera.c           | 43 +++++++++++++++++++++++-------------------
 src/main.c             |  2 +-
 3 files changed, 26 insertions(+), 21 deletions(-)

diff --git a/levels/create_demo.lua b/levels/create_demo.lua
index 5d36270..92c9b58 100755
--- a/levels/create_demo.lua
+++ b/levels/create_demo.lua
@@ -14,4 +14,4 @@ local function create_random_level(width, height, layers)
   end
 end
 
-create_random_level(50, 20, 1)
+create_random_level(10, 4, 1)
diff --git a/src/camera.c b/src/camera.c
index 9c0dd7a..04df880 100644
--- a/src/camera.c
+++ b/src/camera.c
@@ -21,14 +21,30 @@ void camera_step(Camera *camera)
 
 void camera_init(Camera *camera, Player *player, const Level *level)
 {
-	/* calculate min and max */
-	vec_cpy(&camera->min, VEC_SCALED_DCENTER);
-	vec_mul(&camera->min, VEC_PRECISION);
-	vec_cpy(&camera->max, (Vec){0, 0});
-	vec_sub(&camera->max, VEC_SCALED_DCENTER);
-	vec_mul(&camera->max, VEC_PRECISION);
-	vec_add(&camera->max, (Vec){TILE_SIZE * level->width, TILE_SIZE * level->height});
-	vec_cpy(&camera->pos, player->pos);
+	/* check level size */
+	const Vec level_dim = {level->width * (TILE_SIZE / VEC_PRECISION * SCALE),
+		level->height * (TILE_SIZE / VEC_PRECISION * SCALE)};
+	if (level_dim.x > DWIDTH || level_dim.y > DHEIGHT)
+	{
+		/* level cannot be displayed on a single screen */
+		/* calculate min and max */
+		vec_cpy(&camera->min, VEC_SCALED_DCENTER);
+		vec_mul(&camera->min, VEC_PRECISION);
+		vec_cpy(&camera->max, (Vec){0, 0});
+		vec_sub(&camera->max, VEC_SCALED_DCENTER);
+		vec_mul(&camera->max, VEC_PRECISION);
+		vec_add(&camera->max, (Vec){TILE_SIZE * level->width, TILE_SIZE * level->height});
+		vec_cpy(&camera->pos, player->pos);
+	}
+	else
+	{
+		/* level is single screen */
+		/* We calculate the offset and setup the camera to center everything. */
+		const Vec screen_center_precise = {level->width * TILE_SIZE / (2 * SCALE),
+			level->height * TILE_SIZE / (2 * SCALE)};
+		vec_cpy(&camera->min, screen_center_precise);
+		vec_cpy(&camera->max, screen_center_precise);
+	}
 	vec_clamp(&camera->pos, camera->min, camera->max);
 }
 
@@ -38,15 +54,4 @@ void camera_draw_debug(Camera *camera)
 	dprint(0, 10, C_BLACK, "+x: %d, +y: %d", camera->max.x, camera->max.y);
 	dprint(0, 20, C_BLACK, "cx: %d, cy: %d", camera->pos.x, camera->pos.y);
 	dprint(0, 30, C_BLACK, "px: %d, py: %d", camera->offset.x, camera->offset.y);
-	/*Vec draw_pos;
-	vec_cpy(&draw_pos, camera->pos);
-	vec_mul(&draw_pos, SCALE);
-	vec_div(&draw_pos, VEC_PRECISION);
-	#ifdef FX9860G
-	const int color = C_BLACK;
-	#endif /* FX9860G *//*
-	#ifdef FXCG50
-	const int color = C_RED;
-	#endif /* FXCG50 *//*
-	dpixel(draw_pos.x, draw_pos.y, color);*/
 }
diff --git a/src/main.c b/src/main.c
index 80c5aab..b8a781d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -31,7 +31,7 @@ int play_level(uint level_id)
 {
 	/* create player */
 	Player player = {
-		.pos = {64 * VEC_PRECISION, 64 * VEC_PRECISION},
+		.pos = {TILE_SIZE, TILE_SIZE},
 		.hbox = {7 * VEC_PRECISION, 7 * VEC_PRECISION},
 		.vbox = {7, 7},
 		.origin = {4 * VEC_PRECISION, 4 * VEC_PRECISION}