Polyline tool - increment snap implementation.

src/bonsai/bonsai/tool/snap.py

@@ -88,7 +88,6 @@ class Snap(bonsai.core.tool.Snap):
     def clear_snapping_ref(cls):
         bpy.context.scene.BIMPolylineProperties.snap_mouse_ref.clear()
 
-
     @classmethod
     def snap_on_axis(cls, intersection, tool_state, lock_angle=False):
         def create_axis_line_data(rot_mat, origin):
@@ -360,9 +359,28 @@ class Snap(bonsai.core.tool.Snap):
                 rot_intersection, tool_state.snap_angle, axis_start, axis_end = cls.snap_on_axis(
                     intersection, tool_state, False
                 )
-        if rot_intersection:
+
+        increment = None
+        if rv3d.view_perspective == "PERSP":
+            if rv3d.view_distance < 10:
+                increment = 0.1
+            else:
+                increment = 1
+        if rv3d.view_perspective == "ORTHO" or (
+            rv3d.view_perspective == "CAMERA" and context.scene.camera.data.type == "ORTHO"
+        ):
+            window_scale = rv3d.window_matrix.to_scale()
+            if window_scale[0] < -0.1 and window_scale[1] < -0.1:
+                increment = 0.1
+            else:
+                increment = 1
+
+        if rot_intersection and polyline_points:
             detected_snaps.append({"Axis": (rot_intersection, axis_start, axis_end)})
 
+        if increment:
+            for i in range(len(intersection)):
+                intersection[i] = increment * round(intersection[i] / increment)
         detected_snaps.append({"Plane": intersection})
 
         return detected_snaps