From 065c77190d6e3c93c68f400dc9cf9688f2bcd6eb Mon Sep 17 00:00:00 2001
From: Camilla Berglund <elmindreda@users.sourceforge.net>
Date: Wed, 17 Nov 2010 23:33:46 +0100
Subject: [PATCH] Added scroll navigation.

---
 examples/wave.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/examples/wave.c b/examples/wave.c
index d42897cd..543b5d22 100644
--- a/examples/wave.c
+++ b/examples/wave.c
@@ -285,11 +285,12 @@ void key_callback(GLFWwindow window, int key, int action)
             beta += 5;
             break;
         case GLFW_KEY_PAGEUP:
-            if (zoom > 1)
-                zoom -= 1;
+            zoom -= 0.25f;
+            if (zoom < 0.f)
+                zoom = 0.f;
             break;
         case GLFW_KEY_PAGEDOWN:
-            zoom += 1;
+            zoom += 0.25f;
             break;
         default:
             break;
@@ -336,6 +337,18 @@ void mouse_position_callback(GLFWwindow window, int x, int y)
 }
 
 
+//========================================================================
+// Callback function for scroll events
+//========================================================================
+
+void scroll_callback(GLFWwindow window, int x, int y)
+{
+    zoom += y / 4.f;
+    if (zoom < 0)
+        zoom = 0;
+}
+
+
 //========================================================================
 // Callback function for window resize events
 //========================================================================
@@ -389,6 +402,7 @@ int main(int argc, char* argv[])
     glfwSetWindowSizeCallback(window_resize_callback);
     glfwSetMouseButtonCallback(mouse_button_callback);
     glfwSetMousePosCallback(mouse_position_callback);
+    glfwSetScrollCallback(scroll_callback);
 
     // Initialize OpenGL
     init_opengl();