From ec11c67f06fe96a6864f2beca917efab95cf45d9 Mon Sep 17 00:00:00 2001
From: Daniele Verducci <daniele.verducci@ichibi.eu>
Date: Mon, 2 Jan 2023 19:55:09 +0100
Subject: [PATCH] Casting 60 rays

---
 raycaster.py | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/raycaster.py b/raycaster.py
index 88bee89..b428eb6 100755
--- a/raycaster.py
+++ b/raycaster.py
@@ -19,6 +19,8 @@ RAY_LENGTH = 100
 MAP_SCALE = 80
 DOF = 8	# Depth Of Field
 
+DEGREE_IN_RADIANTS = 0.01745329
+
 MAP = [
 	1, 1, 1, 1, 1, 1, 1, 1,
 	1, 0, 0, 0, 1, 0, 0, 1,
@@ -60,9 +62,9 @@ class Main:
 				if event.type == sdl2.SDL_KEYDOWN:
 					# Rotate player
 					if event.key.keysym.sym == sdl2.SDLK_LEFT:
-						self.player_position["r"] = self.player_position["r"] - 0.1
+						self.player_position["r"] = self.player_position["r"] - 5*DEGREE_IN_RADIANTS
 					elif event.key.keysym.sym == sdl2.SDLK_RIGHT:
-						self.player_position["r"] = self.player_position["r"] + 0.1
+						self.player_position["r"] = self.player_position["r"] + 5*DEGREE_IN_RADIANTS
 
 					# Compute deltax and deltay based on player direction
 					player_delta_x = math.cos(self.player_position["r"]) * PLAYER_SPEED
@@ -108,6 +110,8 @@ class Main:
 			"x": int(self.player_position["x"] + math.cos(self.player_position["r"]) * 50), # deltaX + playerX
 			"y": int(self.player_position["y"] + math.sin(self.player_position["r"]) * 50)  # deltaY + playerY
 		}
+		sdl2.ext.draw.line(self.mapSurface, sdl2.ext.Color(255,0,0,255), (self.player_position["x"], self.player_position["y"], ray["x"], ray["y"]))
+
 
 	def draw2Dmap(self):
 		# 2D map
@@ -121,14 +125,18 @@ class Main:
 
 	def drawRays(self):
 		# Casts rays for raycasting
-		rayAngle = self.player_position["r"]
-		for r in range(1):
+		playerAngle = self.player_position["r"]
+
+		# Cast 60 rays from -30° to +30° (60° viewing angle)
+		for r in range(60):
+			rayAngle = playerAngle - (r - 30)*DEGREE_IN_RADIANTS
+
 			# Check horizontal lines
 			dof = 0 # Depth of field
 			if rayAngle == 0 or rayAngle == math.pi:
 				# Looking left or right (ray will never intersect parallel lines)
 				rayY = self.player_position["y"]
-				rayX = self.player_position["x"]
+				rayX = self.player_position["x"] + DOF * MAP_SCALE
 				dof = DOF	# Set depth of field to maximum to avoid unneeded checks
 			elif rayAngle > math.pi:
 				# Looking up
@@ -150,7 +158,7 @@ class Main:
 				mapX = int(rayX / MAP_SCALE)
 				mapY = int(rayY / MAP_SCALE)
 				mapArrayPosition = mapY * MAP_SIZE + mapX
-				if mapArrayPosition < MAP_SIZE*MAP_SIZE and MAP[mapArrayPosition] != 0:
+				if mapArrayPosition >= 0 and mapArrayPosition < MAP_SIZE*MAP_SIZE and MAP[mapArrayPosition] != 0:
 					dof = 8	# Hit the wall: we are done, no need to do other checks
 				else:
 					# Didn't hit the wall: check successive horizontal line
@@ -171,7 +179,7 @@ class Main:
 			#if rayAngle == 0 or rayAngle == math.pi:
 				# Looking up or down (ray will never intersect vertical lines)
 				rayX = self.player_position["x"]
-				rayY = self.player_position["y"]
+				rayY = self.player_position["y"] + DOF * MAP_SCALE
 				dof = DOF	# Set depth of field to maximum to avoid unneeded checks
 			elif rayAngle > math.pi * 0.5 and rayAngle < math.pi * 1.5:
 				# Looking right