From 58ff14f5c31b933a1d2f91d6cae7280366d3ffb9 Mon Sep 17 00:00:00 2001
From: James Barnett <noreply@jamesbarnett.xyz>
Date: Thu, 31 Dec 2020 15:48:37 +0000
Subject: Keep camera in map boundary

---
 src/main/kotlin/CameraController.kt | 17 +++++++++++++++++
 src/main/kotlin/Raycaster.kt        |  2 --
 src/main/kotlin/main.kt             |  8 +++++++-
 3 files changed, 24 insertions(+), 3 deletions(-)

(limited to 'src/main/kotlin')

diff --git a/src/main/kotlin/CameraController.kt b/src/main/kotlin/CameraController.kt
index 510f1a0..c2885de 100644
--- a/src/main/kotlin/CameraController.kt
+++ b/src/main/kotlin/CameraController.kt
@@ -5,6 +5,8 @@ class CameraController(
   private val camera: Camera,
   private val moveSpeed: Double,
   private val rotateSpeed: Int,
+  private val xMax: Int,
+  private val yMax: Int,
   private val afterInput: () -> Unit
 ) {
 
@@ -30,6 +32,7 @@ class CameraController(
     val cameraSin = camera.rotation.sine() * moveSpeed
     camera.xPos += cameraCos
     camera.yPos += cameraSin
+    boundsCheck(camera)
     afterInput()
   }
 
@@ -38,6 +41,7 @@ class CameraController(
     val cameraSin = camera.rotation.sine() * moveSpeed
     camera.xPos -= cameraCos
     camera.yPos -= cameraSin
+    boundsCheck(camera)
     afterInput()
   }
 
@@ -51,4 +55,17 @@ class CameraController(
     afterInput()
   }
 
+  private fun boundsCheck(camera: Camera) {
+    camera.xPos = clamp(camera.xPos, xMax)
+    camera.yPos = clamp(camera.yPos, yMax)
+  }
+
+  private fun clamp(position: Double, max: Int): Double {
+    return when {
+      position < 1 -> 1.0
+      position > max -> max.toDouble()
+      else -> position
+    }
+  }
+
 }
\ No newline at end of file
diff --git a/src/main/kotlin/Raycaster.kt b/src/main/kotlin/Raycaster.kt
index f012ba8..53c6dc6 100644
--- a/src/main/kotlin/Raycaster.kt
+++ b/src/main/kotlin/Raycaster.kt
@@ -27,8 +27,6 @@ class Raycaster {
       do {
         rayX += raySweepAngle.cosine() / options.stepPrecision
         rayY += raySweepAngle.sine() / options.stepPrecision
-
-        // TODO bounds checking
         objectTypeHit = map.data[rayY.toFlooredInt()][rayX.toFlooredInt()]
       } while (objectTypeHit == 0)
 
diff --git a/src/main/kotlin/main.kt b/src/main/kotlin/main.kt
index c29374d..0d0d600 100644
--- a/src/main/kotlin/main.kt
+++ b/src/main/kotlin/main.kt
@@ -18,7 +18,13 @@ fun main() {
 
     val raycaster = Raycaster()
 
-    CameraController(camera, moveSpeed = 1.0, rotateSpeed = 15) {
+    CameraController(
+      camera,
+      moveSpeed = 1.0,
+      rotateSpeed = 15,
+      xMax = map.width - 1,
+      yMax = map.height - 1
+    ) {
       paint(raycaster, context)
     }
 
-- 
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