From f864f31f8ef206a363d0dac43558d42c5db46baa Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Sat, 10 Dec 2016 12:42:20 +0100
Subject: Enable offset world drawing; center in viewport

---
 src/world.h | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/world.h b/src/world.h
index d951cf5..72cc32f 100644
--- a/src/world.h
+++ b/src/world.h
@@ -69,11 +69,21 @@ class World {
 		}
 
 		void summonLifeAt(std::size_t x, std::size_t y) {
-			this->matrix_[y][x] = true;
+			if ( x >= 0      &&
+			     x <  WIDTH  &&
+			     y >= 0      &&
+			     y <  HEIGHT ) {
+				this->matrix_[y][x] = true;
+			}
 		}
 
 		void extinguishLifeAt(std::size_t x, std::size_t y) {
-			this->matrix_[y][x] = false;
+			if ( x >= 0      &&
+			     x <  WIDTH  &&
+			     y >= 0      &&
+			     y <  HEIGHT ) {
+				this->matrix_[y][x] = false;
+			}
 		}
 
 		void tick() {
-- 
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