Slide doors open

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

lib/features/renderer/raycast_painter.dart

@@ -11,6 +11,7 @@ class RaycasterPainter extends CustomPainter {
   final LinearCoordinates player;
   final double playerAngle;
   final double fov;
+  final Map<String, double> doorOffsets;
 
   RaycasterPainter({
     required this.map,
@@ -18,6 +19,7 @@ class RaycasterPainter extends CustomPainter {
     required this.player,
     required this.playerAngle,
     required this.fov,
+    required this.doorOffsets,
   });
 
   @override
@@ -61,6 +63,11 @@ class RaycasterPainter extends CustomPainter {
       bool hitOutOfBounds = false;
       int side = 0;
       int hitWallId = 0;
+      double doorOffset =
+          0.0; // Track the slide amount to pass to the texture drawer
+
+      Set<String> ignoredDoors =
+          {}; // Prevent the ray from checking the same door gap twice
 
       if (rayDirX < 0) {
         stepX = -1;
@@ -94,8 +101,33 @@ class RaycasterPainter extends CustomPainter {
             mapX < 0 ||
             mapX >= map[0].length) {
           hit = true;
-          hitOutOfBounds = true; // Safely abort if we clip out of bounds
+          hitOutOfBounds = true;
         } else if (map[mapY][mapX] > 0) {
+          // NEW: DOOR PASS-THROUGH LOGIC
+          String doorKey = '$mapX,$mapY';
+          if (map[mapY][mapX] >= 90 && !ignoredDoors.contains(doorKey)) {
+            double currentOffset = doorOffsets[doorKey] ?? 0.0;
+
+            if (currentOffset > 0.0) {
+              // Calculate exactly where the ray hit the block
+              double perpWallDistTemp = (side == 0)
+                  ? (sideDistX - deltaDistX)
+                  : (sideDistY - deltaDistY);
+              double wallXTemp = (side == 0)
+                  ? player.y + perpWallDistTemp * rayDirY
+                  : player.x + perpWallDistTemp * rayDirX;
+              wallXTemp -= wallXTemp.floor();
+
+              // If the hit coordinate is less than the open amount, the ray passes through!
+              if (wallXTemp < currentOffset) {
+                ignoredDoors.add(doorKey);
+                continue; // Skip the rest of this loop iteration and keep raycasting!
+              }
+            }
+            doorOffset =
+                currentOffset; // Save the offset so we can slide the texture
+          }
+
           hit = true;
           hitWallId = map[mapY][mapX];
         }
@@ -127,6 +159,7 @@ class RaycasterPainter extends CustomPainter {
         size,
         hitWallId,
         textures,
+        doorOffset,
       );
     }
   }
@@ -140,28 +173,29 @@ class RaycasterPainter extends CustomPainter {
     Size size,
     int hitWallId,
     List<Matrix<int>> textures,
+    double doorOffset,
   ) {
     if (distance <= 0.01) distance = 0.01;
 
     double wallHeight = size.height / distance;
     int drawStart = ((size.height / 2) - (wallHeight / 2)).toInt();
 
-    // 1. PERFECT TEXTURE MAPPING
+    // TEXTURE MAPPING
     // Wolf3D stores textures in pairs. Even = N/S (Light), Odd = E/W (Dark).
     int texNum = ((hitWallId - 1) * 2).clamp(0, textures.length - 2);
+    int texX = (wallX * 64).toInt().clamp(0, 63);
 
     // INTERCEPT DOORS
     if (hitWallId >= 90) {
       // Safely clamp the door texture index so it never crashes the paint loop!
       texNum = 98.clamp(0, textures.length - 1);
+      texX = ((wallX - doorOffset) * 64).toInt().clamp(0, 63);
     } else {
       // Standard wall texture pairing
       texNum = ((hitWallId - 1) * 2).clamp(0, textures.length - 2);
       if (side == 1) texNum += 1;
     }
 
-    int texX = (wallX * 64).toInt().clamp(0, 63);
-
     if (side == 0 && math.cos(playerAngle) > 0) texX = 63 - texX;
     if (side == 1 && math.sin(playerAngle) < 0) texX = 63 - texX;