From 10393d2c27ea60e3fa8e7b76ecf9abe06832b726 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Sun, 22 Sep 2019 21:04:00 +0200
Subject: Extract projection, add zoom support

---
 utility/mouse.py | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

(limited to 'utility')

diff --git a/utility/mouse.py b/utility/mouse.py
index c36d7e8..29d660d 100644
--- a/utility/mouse.py
+++ b/utility/mouse.py
@@ -1,10 +1,11 @@
 from OpenGL.GLUT import *
 
 class MouseDragMonitor:
-    def __init__(self, button, callback):
+    def __init__(self, button, drag_callback, zoom_callback):
         self.button   = button
-        self.callback = callback
         self.active   = False
+        self.drag_callback = drag_callback
+        self.zoom_callback = zoom_callback
 
     def on_mouse(self, button, state, x, y):
         if button == self.button:
@@ -12,10 +13,15 @@ class MouseDragMonitor:
             self.last_x = x
             self.last_y = y
 
+        if button == 3:
+            self.zoom_callback(-1.0)
+        elif button == 4:
+            self.zoom_callback(1.0)
+
     def on_mouse_move(self, x, y):
         if self.active:
             delta_x = self.last_x - x
             delta_y = y - self.last_y
             self.last_x = x
             self.last_y = y
-            self.callback(delta_x, delta_y)
+            self.drag_callback(delta_x, delta_y)
-- 
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