From 7471347839f30a85e985891b945a721967fcfb86 Mon Sep 17 00:00:00 2001
From: Paweł Redman <pawel.redman@gmail.com>
Date: Tue, 7 Nov 2017 12:06:19 +0100
Subject: Avoid walking into walls.

---
 src/common.hpp |  2 +-
 src/game.cpp   | 36 +++++++++++++++++++++++++++++-------
 src/render.cpp |  8 +++++---
 src/world.cpp  | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 88 insertions(+), 11 deletions(-)

diff --git a/src/common.hpp b/src/common.hpp
index 10fafcf..a301881 100644
--- a/src/common.hpp
+++ b/src/common.hpp
@@ -113,7 +113,7 @@ namespace world {
 		std::list<entity_t*> get_entities(rectf_t rect, cflags_t cflags);
 		std::list<entity_t*> get_render_entities(rectf_t rect);
 
-		bool test_rect(rectf_t rect, cflags_t cflags);
+		bool test_rect(const cmodel_t *cmodel, const entity_t *ignore);
 
 		void debug_point(sf::Vector2f point);
 	};
diff --git a/src/game.cpp b/src/game.cpp
index a2f4bbc..e8c179a 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -5,10 +5,19 @@ namespace game {
 class unit_t : public world::entity_t {
 	world::world_t *world;
 
+	world::cmodel_t make_cmodel(v2f_t at)
+	{
+		world::cmodel_t cmodel;
+
+		cmodel.bounds[0] = at + size[0];
+		cmodel.bounds[1] = at + size[1];
+		cmodel.cflags = cflags;
+
+		return cmodel;
+	}
+
 	void compute_bounds()
 	{
-		cmodel.bounds[0] = x + size[0];
-		cmodel.bounds[1] = x + size[1];
 		render_bounds[0] = x + render_size[0];
 		render_bounds[1] = x + render_size[1];
 	}
@@ -16,6 +25,7 @@ class unit_t : public world::entity_t {
 public:
 	v2f_t x;
 	rectf_t size, render_size;
+	world::cflags_t cflags;
 
 	struct {
 		bool moving = false;
@@ -30,9 +40,10 @@ public:
 		world = world_;
 		x = x_;
 		move.moving = false;
-		cmodel.cflags = 1;
+		cflags = 1;
 
 		unlink();
+		cmodel = make_cmodel(x);
 		compute_bounds();
 		link(world);
 	}
@@ -47,7 +58,8 @@ public:
 		time = 0.15;
 
 		while (time > 0.0f) {
-			v2f_t delta, next;
+			v2f_t delta, next, x_new;
+			world::cmodel_t cmodel_next;
 
 			if (!move.path.size()) {
 				move.moving = false;
@@ -59,15 +71,25 @@ public:
 			move.angle = delta.angle();
 
 			if (delta.len() >= time) {
-				x += delta * time / delta.len();
-				break;
+				x_new = x + delta * time / delta.len();
+				time -= delta.len();
 			} else {
-				x = next;
+				x_new = next;
 				time -= delta.len();
 				move.path.pop_front();
 			}
+
+			cmodel_next = make_cmodel(x_new);
+			if (world->test_rect(&cmodel_next, this)) {
+				move.moving = false;
+				break;
+			}
+
+			x = x_new;
+			cmodel = cmodel_next;
 		}
 
+
 		unlink();
 		compute_bounds();
 		link(world);
diff --git a/src/render.cpp b/src/render.cpp
index 9fb1625..313bc4d 100644
--- a/src/render.cpp
+++ b/src/render.cpp
@@ -5,7 +5,8 @@
 static sf::RectangleShape wot_rect;
 static sf::Font font;
 
-static void draw_tile(sf::RenderWindow *window, v2f_t x, world::tile_t *tile)
+static void draw_tile(sf::RenderWindow *window, v2f_t x, world::tile_t *tile,
+                      world::tile_index_t local)
 {
 	sf::Texture *texture;
 
@@ -30,7 +31,7 @@ static void draw_tile(sf::RenderWindow *window, v2f_t x, world::tile_t *tile)
 	window->draw(wot_rect);
 
 	std::stringstream ss;
-	ss << tile->type << ":" << tile->neighbors;
+	ss << "L=" << local; 
 	sf::Text text(ss.str(), font, 20);
 	text.setPosition(x);
 	text.setScale(0.005, 0.005);
@@ -42,7 +43,8 @@ static void draw_sector(sf::RenderWindow *window, world::sector_t *sector)
 	for (ssize_t y = 0; y < SECTOR_SIZE; y++)
 	for (ssize_t x = 0; x < SECTOR_SIZE; x++)
 		draw_tile(window, sector->bounds.v[0] + v2f_t(x, y),
-		          sector->tiles + y * SECTOR_SIZE + x);
+		          sector->tiles + y * SECTOR_SIZE + x,
+		          world::tile_index_t(x, y));
 }
 
 void interface::state_t::render()
diff --git a/src/world.cpp b/src/world.cpp
index 778e463..2339dbf 100644
--- a/src/world.cpp
+++ b/src/world.cpp
@@ -230,6 +230,59 @@ std::list<entity_t*> world_t::get_render_entities(rectf_t rect)
 	return list;
 }
 
+bool world_t::test_rect(const cmodel_t *cmodel, const entity_t *ignore)
+{
+	static size_t cookie = 0;
+
+	cookie++;
+
+	for (sector_t *sector : get_sectors(cmodel->bounds)) {
+		rect_t<coord_t, 2> bounds;
+		tile_index_t index;
+
+		bounds[0] = (cmodel->bounds[0] - sector->bounds[0]).floor();
+		bounds[1] = (cmodel->bounds[1] - sector->bounds[0]).floor();
+
+		if (bounds[0][0] < 0)
+			bounds[0][0] = 0;
+		if (bounds[0][1] < 0)
+			bounds[0][1] = 0;
+		if (bounds[1][0] >= (coord_t)SECTOR_SIZE)
+			bounds[1][0] = SECTOR_SIZE - 1;
+		if (bounds[1][1] >= (coord_t)SECTOR_SIZE)
+			bounds[1][1] = SECTOR_SIZE - 1;
+
+		for (index[1] = bounds[0][1]; index[1] <= bounds[1][1]; index[1]++)
+		for (index[0] = bounds[0][0]; index[0] <= bounds[1][0]; index[0]++) {
+			tile_t *tile;
+
+			tile = sector->tiles + index[1] * SECTOR_SIZE + index[0];
+			if (tile->type != TILE_DIRT)
+				return true;
+		}
+
+		for (entity_t *ent : sector->ents) {
+			if (ent == ignore)
+				continue;
+
+			if (ent->cookie == cookie)
+				continue;
+
+			ent->cookie = cookie;
+
+			if (!(ent->cmodel.cflags & cmodel->cflags))
+				continue;
+
+			if (!(cmodel->bounds && ent->cmodel.bounds))
+				continue;
+
+			return true;
+		}
+	}
+
+	return false;
+}
+
 void world_t::debug_point(sf::Vector2f point)
 {
 	sector_index_t index = sector_index_at(point);
-- 
cgit