From 3a2c86dc97c36fb8054fe2b7bec90566aba85966 Mon Sep 17 00:00:00 2001
From: kushalkolar <kushalkolar@gmail.com>
Date: Mon, 24 Feb 2025 04:10:44 -0500
Subject: [PATCH 1/4] Graphic.add_text

---
 fastplotlib/graphics/_base.py | 66 +++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)

diff --git a/fastplotlib/graphics/_base.py b/fastplotlib/graphics/_base.py
index a25bc7176..03af17826 100644
--- a/fastplotlib/graphics/_base.py
+++ b/fastplotlib/graphics/_base.py
@@ -361,6 +361,72 @@ def my_handler(event):
                 feature = getattr(self, f"_{t}")
                 feature.remove_event_handler(wrapper)
 
+    def add_text(self, text: str, location: str = "center", location_z: str = "front", **kwargs):
+        """
+        Add a TextGraphic at one of the corners or center of this graphic.
+
+        Note 1:
+        Note 2: Uses axis aligned bounding box to get corners, does not account for any rotation set on the graphic.
+
+        Parameters
+        ----------
+        text: str
+            text to display in the ``TextGraphic``
+
+        location: str, default "center"
+            one of "center", "top-left", "top-right", "bottom-right", or "bottom-left"
+
+        location_z: str, default "front"
+            one of "front" or "back"
+
+        spacing: float, default 2.0
+            number of pixels from the corner of the graphic to the TextGraphic position, ignored if location = "center"
+
+        kwargs
+            passed to ``TextGraphic``
+
+        Returns
+        -------
+            TextGraphic
+
+        """
+        valid = ["center", "top-left", "top-right", "bottom-right", "bottom-left"]
+        if not isinstance(location, str):
+            raise TypeError("`location` must be of type <str>")
+        if location not in valid:
+            raise ValueError(f"`location` must be one of : {valid}, you have passed: {location}")
+
+        if location == "center":
+            x, y, z, r = self.world_object.get_world_bounding_sphere()
+
+            return self._plot_area.add_text(text, offset=(x, y, z), **kwargs)
+
+        bbox = self.world_object.get_world_bounding_box()
+
+        for i, axis in enumerate(["x", "y", "z"]):
+            if getattr(self._plot_area.camera.local, f"scale_{axis}") < 0:
+                # swap boundary values for this axis
+                bbox[0, i], bbox[1, i] = bbox[1, i], bbox[0, i]
+                print(f"flipped: {i}")
+
+        [[x1, y1, z1], [x2, y2, z2]] = bbox
+
+        # set (x, y, z) location of text based on user str
+        if "top" in location:
+            y = y2
+        elif "bottom" in location:
+            y = y1
+        if "left" in location:
+            x = x1
+        elif "right" in location:
+            x = x2
+        if location_z == "front":
+            z = z1
+        elif location_z == "back":
+            z = z2
+
+        return self._plot_area.add_text(text, offset=(x, y, z), **kwargs)
+
     def _fpl_add_plot_area_hook(self, plot_area):
         self._plot_area = plot_area
 

From 8ec898d8192b76f240b1a354eb0a0b2fe1a2f89a Mon Sep 17 00:00:00 2001
From: kushalkolar <kushalkolar@gmail.com>
Date: Mon, 24 Feb 2025 04:14:07 -0500
Subject: [PATCH 2/4] comment, black

---
 fastplotlib/graphics/_base.py | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/fastplotlib/graphics/_base.py b/fastplotlib/graphics/_base.py
index 03af17826..8af8e6708 100644
--- a/fastplotlib/graphics/_base.py
+++ b/fastplotlib/graphics/_base.py
@@ -361,11 +361,13 @@ def my_handler(event):
                 feature = getattr(self, f"_{t}")
                 feature.remove_event_handler(wrapper)
 
-    def add_text(self, text: str, location: str = "center", location_z: str = "front", **kwargs):
+    def add_text(
+        self, text: str, location: str = "center", location_z: str = "front", **kwargs
+    ):
         """
         Add a TextGraphic at one of the corners or center of this graphic.
 
-        Note 1:
+        Note 1: If an axis is flipped, location is relative to the rendered view not the location in world space
         Note 2: Uses axis aligned bounding box to get corners, does not account for any rotation set on the graphic.
 
         Parameters
@@ -394,7 +396,9 @@ def add_text(self, text: str, location: str = "center", location_z: str = "front
         if not isinstance(location, str):
             raise TypeError("`location` must be of type <str>")
         if location not in valid:
-            raise ValueError(f"`location` must be one of : {valid}, you have passed: {location}")
+            raise ValueError(
+                f"`location` must be one of : {valid}, you have passed: {location}"
+            )
 
         if location == "center":
             x, y, z, r = self.world_object.get_world_bounding_sphere()

From c32a4bc66a918fed0fd3835d4f1fe3933510aa04 Mon Sep 17 00:00:00 2001
From: kushalkolar <kushalkolar@gmail.com>
Date: Mon, 24 Feb 2025 04:31:42 -0500
Subject: [PATCH 3/4] move if offset or data changes, WIP

---
 fastplotlib/graphics/_base.py | 92 +++++++++++++++++++++--------------
 1 file changed, 56 insertions(+), 36 deletions(-)

diff --git a/fastplotlib/graphics/_base.py b/fastplotlib/graphics/_base.py
index 8af8e6708..2081b292f 100644
--- a/fastplotlib/graphics/_base.py
+++ b/fastplotlib/graphics/_base.py
@@ -361,6 +361,47 @@ def my_handler(event):
                 feature = getattr(self, f"_{t}")
                 feature.remove_event_handler(wrapper)
 
+    def _get_corner(self, location: str, location_z) -> tuple[float, float, float]:
+        valid = ["center", "top-left", "top-right", "bottom-right", "bottom-left"]
+        if not isinstance(location, str):
+            raise TypeError("`location` must be of type <str>")
+        if location not in valid:
+            raise ValueError(
+                f"`location` must be one of : {valid}, you have passed: {location}"
+            )
+
+        if location == "center":
+            x, y, z, r = self.world_object.get_world_bounding_sphere()
+
+            return (x, y, z)
+
+        else:
+            bbox = self.world_object.get_world_bounding_box()
+
+            for i, axis in enumerate(["x", "y", "z"]):
+                if getattr(self._plot_area.camera.local, f"scale_{axis}") < 0:
+                    # swap boundary values for this axis
+                    bbox[0, i], bbox[1, i] = bbox[1, i], bbox[0, i]
+                    print(f"flipped: {i}")
+
+            [[x1, y1, z1], [x2, y2, z2]] = bbox
+
+            # set (x, y, z) location of text based on user str
+            if "top" in location:
+                y = y2
+            elif "bottom" in location:
+                y = y1
+            if "left" in location:
+                x = x1
+            elif "right" in location:
+                x = x2
+            if location_z == "front":
+                z = z1
+            elif location_z == "back":
+                z = z2
+
+            return (x, y, z)
+
     def add_text(
         self, text: str, location: str = "center", location_z: str = "front", **kwargs
     ):
@@ -392,44 +433,23 @@ def add_text(
             TextGraphic
 
         """
-        valid = ["center", "top-left", "top-right", "bottom-right", "bottom-left"]
-        if not isinstance(location, str):
-            raise TypeError("`location` must be of type <str>")
-        if location not in valid:
-            raise ValueError(
-                f"`location` must be one of : {valid}, you have passed: {location}"
-            )
+        offset = self._get_corner(location, location_z)
 
-        if location == "center":
-            x, y, z, r = self.world_object.get_world_bounding_sphere()
+        def update_offset(ev):
+            new_offset = self._get_corner(*ev.graphic._location)
+            ev.graphic.offset = new_offset
+
+        text_graphic = self._plot_area.add_text(text, offset=offset, metadata=(location, location_z), **kwargs)
+        text_graphic._location = (location, location_z)
+
+        text_graphic.add_event_handler(update_offset, "offset")
+
+        class_name = self.__class__.__name__
+
+        if "Line" in class_name or "Scatter" in class_name:
+            text_graphic.add_event_handler(update_offset, "data")
 
-            return self._plot_area.add_text(text, offset=(x, y, z), **kwargs)
-
-        bbox = self.world_object.get_world_bounding_box()
-
-        for i, axis in enumerate(["x", "y", "z"]):
-            if getattr(self._plot_area.camera.local, f"scale_{axis}") < 0:
-                # swap boundary values for this axis
-                bbox[0, i], bbox[1, i] = bbox[1, i], bbox[0, i]
-                print(f"flipped: {i}")
-
-        [[x1, y1, z1], [x2, y2, z2]] = bbox
-
-        # set (x, y, z) location of text based on user str
-        if "top" in location:
-            y = y2
-        elif "bottom" in location:
-            y = y1
-        if "left" in location:
-            x = x1
-        elif "right" in location:
-            x = x2
-        if location_z == "front":
-            z = z1
-        elif location_z == "back":
-            z = z2
-
-        return self._plot_area.add_text(text, offset=(x, y, z), **kwargs)
+        return text_graphic
 
     def _fpl_add_plot_area_hook(self, plot_area):
         self._plot_area = plot_area

From 9722aacb9ccd136db653a195520e0e43b9c171c1 Mon Sep 17 00:00:00 2001
From: kushalkolar <kushalkolar@gmail.com>
Date: Mon, 24 Feb 2025 04:43:29 -0500
Subject: [PATCH 4/4] text moves if graphic offset or data change

---
 fastplotlib/graphics/_base.py | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/fastplotlib/graphics/_base.py b/fastplotlib/graphics/_base.py
index 2081b292f..c075ad048 100644
--- a/fastplotlib/graphics/_base.py
+++ b/fastplotlib/graphics/_base.py
@@ -49,6 +49,12 @@
 ]
 
 
+def _update_text_offset(parent, tg, ev):
+    # helper function
+    new_offset = parent._fpl_get_corner(*tg._location)
+    tg.offset = new_offset
+
+
 class Graphic:
     _features: set[str] = {}
 
@@ -361,7 +367,8 @@ def my_handler(event):
                 feature = getattr(self, f"_{t}")
                 feature.remove_event_handler(wrapper)
 
-    def _get_corner(self, location: str, location_z) -> tuple[float, float, float]:
+    def _fpl_get_corner(self, location: str, location_z) -> tuple[float, float, float]:
+        """Get the (x, y, z) corner of a graphic relative to the rendered view"""
         valid = ["center", "top-left", "top-right", "bottom-right", "bottom-left"]
         if not isinstance(location, str):
             raise TypeError("`location` must be of type <str>")
@@ -382,7 +389,6 @@ def _get_corner(self, location: str, location_z) -> tuple[float, float, float]:
                 if getattr(self._plot_area.camera.local, f"scale_{axis}") < 0:
                     # swap boundary values for this axis
                     bbox[0, i], bbox[1, i] = bbox[1, i], bbox[0, i]
-                    print(f"flipped: {i}")
 
             [[x1, y1, z1], [x2, y2, z2]] = bbox
 
@@ -433,21 +439,19 @@ def add_text(
             TextGraphic
 
         """
-        offset = self._get_corner(location, location_z)
-
-        def update_offset(ev):
-            new_offset = self._get_corner(*ev.graphic._location)
-            ev.graphic.offset = new_offset
+        offset = self._fpl_get_corner(location, location_z)
 
         text_graphic = self._plot_area.add_text(text, offset=offset, metadata=(location, location_z), **kwargs)
         text_graphic._location = (location, location_z)
 
-        text_graphic.add_event_handler(update_offset, "offset")
+        events = ["offset"]
 
         class_name = self.__class__.__name__
 
         if "Line" in class_name or "Scatter" in class_name:
-            text_graphic.add_event_handler(update_offset, "data")
+            events.append("data")
+
+        self.add_event_handler(partial(_update_text_offset, self, text_graphic), *events)
 
         return text_graphic
 

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