From ab930a71ca076480f78a6a5f42ac2ff5cef24d08 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Sun, 22 Sep 2019 15:56:40 +0200
Subject: Enable mouse-based view rotation

---
 utility/mouse.py | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 utility/mouse.py

(limited to 'utility')

diff --git a/utility/mouse.py b/utility/mouse.py
new file mode 100644
index 0000000..c36d7e8
--- /dev/null
+++ b/utility/mouse.py
@@ -0,0 +1,21 @@
+from OpenGL.GLUT import *
+
+class MouseDragMonitor:
+    def __init__(self, button, callback):
+        self.button   = button
+        self.callback = callback
+        self.active   = False
+
+    def on_mouse(self, button, state, x, y):
+        if button == self.button:
+            self.active = (state == GLUT_DOWN)
+            self.last_x = x
+            self.last_y = y
+
+    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)
-- 
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