Enable mouse-based view rotation

1 files changed, 21 insertions, 0 deletions

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)