From 7adcf29ca7eda26535a939cbb5f4ef3fa26fae9c Mon Sep 17 00:00:00 2001
From: Eric Leao <86169515+EricRLeao1311@users.noreply.github.com>
Date: Sun, 12 Nov 2023 15:45:01 -0300
Subject: [PATCH 01/12] Adding Scalar as a Baseline Option

---
 lib/matplotlib/stackplot.py | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/lib/matplotlib/stackplot.py b/lib/matplotlib/stackplot.py
index 4e933f52887d..9a6238376577 100644
--- a/lib/matplotlib/stackplot.py
+++ b/lib/matplotlib/stackplot.py
@@ -32,7 +32,7 @@ def stackplot(axes, x, *args,
             stackplot(x, y)           # where y has shape (M, N)
             stackplot(x, y1, y2, y3)  # where y1, y2, y3, y4 have length N
 
-    baseline : {'zero', 'sym', 'wiggle', 'weighted_wiggle'}
+    baseline : {'zero', 'sym', 'wiggle', 'weighted_wiggle', int}
         Method used to calculate the baseline:
 
         - ``'zero'``: Constant zero baseline, i.e. a simple stacked plot.
@@ -42,6 +42,7 @@ def stackplot(axes, x, *args,
         - ``'weighted_wiggle'``: Does the same but weights to account for
           size of each layer. It is also called 'Streamgraph'-layout. More
           details can be found at http://leebyron.com/streamgraph/.
+        - ``int``:  Scalar baseline. Useful for cases where 0 is not sensible.
 
     labels : list of str, optional
         A sequence of labels to assign to each data series. If unspecified,
@@ -94,8 +95,9 @@ def stackplot(axes, x, *args,
     # We'll need a float buffer for the upcoming calculations.
     stack = np.cumsum(y, axis=0, dtype=np.promote_types(y.dtype, np.float32))
 
-    _api.check_in_list(['zero', 'sym', 'wiggle', 'weighted_wiggle'],
-                       baseline=baseline)
+    if isinstance(baseline, int) != True:
+        _api.check_in_list(['zero', 'sym', 'wiggle', 'weighted_wiggle'],
+                        baseline=baseline)
     if baseline == 'zero':
         first_line = 0.
 
@@ -125,6 +127,10 @@ def stackplot(axes, x, *args,
         first_line = center - 0.5 * total
         stack += first_line
 
+    else:
+        # Here we are 100% certain that baseline is an integer
+        first_line = baseline.
+
     # Color between x = 0 and the first array.
     coll = axes.fill_between(x, first_line, stack[0, :],
                              facecolor=next(colors),

From a1e9245d1663dec19a3f1f1239775b9d59320256 Mon Sep 17 00:00:00 2001
From: Eric Leao <86169515+EricRLeao1311@users.noreply.github.com>
Date: Sun, 12 Nov 2023 15:55:07 -0300
Subject: [PATCH 02/12] fixing linting and casting issue

---
 lib/matplotlib/stackplot.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/matplotlib/stackplot.py b/lib/matplotlib/stackplot.py
index 9a6238376577..b43fb824f8df 100644
--- a/lib/matplotlib/stackplot.py
+++ b/lib/matplotlib/stackplot.py
@@ -95,9 +95,9 @@ def stackplot(axes, x, *args,
     # We'll need a float buffer for the upcoming calculations.
     stack = np.cumsum(y, axis=0, dtype=np.promote_types(y.dtype, np.float32))
 
-    if isinstance(baseline, int) != True:
+    if not isinstance(baseline, int):
         _api.check_in_list(['zero', 'sym', 'wiggle', 'weighted_wiggle'],
-                        baseline=baseline)
+                            baseline=baseline)
     if baseline == 'zero':
         first_line = 0.
 
@@ -129,7 +129,7 @@ def stackplot(axes, x, *args,
 
     else:
         # Here we are 100% certain that baseline is an integer
-        first_line = baseline.
+        first_line = float(baseline)
 
     # Color between x = 0 and the first array.
     coll = axes.fill_between(x, first_line, stack[0, :],

From e7d6e404e16261f14d3e699b639cda3b1adef29d Mon Sep 17 00:00:00 2001
From: Eric Leao <86169515+EricRLeao1311@users.noreply.github.com>
Date: Sun, 19 Nov 2023 14:36:31 -0300
Subject: [PATCH 03/12] adding float acceptance

---
 lib/matplotlib/stackplot.py | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/matplotlib/stackplot.py b/lib/matplotlib/stackplot.py
index b43fb824f8df..f0ff645334a8 100644
--- a/lib/matplotlib/stackplot.py
+++ b/lib/matplotlib/stackplot.py
@@ -32,7 +32,7 @@ def stackplot(axes, x, *args,
             stackplot(x, y)           # where y has shape (M, N)
             stackplot(x, y1, y2, y3)  # where y1, y2, y3, y4 have length N
 
-    baseline : {'zero', 'sym', 'wiggle', 'weighted_wiggle', int}
+    baseline : {'zero', 'sym', 'wiggle', 'weighted_wiggle', float}
         Method used to calculate the baseline:
 
         - ``'zero'``: Constant zero baseline, i.e. a simple stacked plot.
@@ -42,7 +42,7 @@ def stackplot(axes, x, *args,
         - ``'weighted_wiggle'``: Does the same but weights to account for
           size of each layer. It is also called 'Streamgraph'-layout. More
           details can be found at http://leebyron.com/streamgraph/.
-        - ``int``:  Scalar baseline. Useful for cases where 0 is not sensible.
+        - ``float``:  Scalar baseline. Useful for cases where 0 is not sensible.
 
     labels : list of str, optional
         A sequence of labels to assign to each data series. If unspecified,
@@ -95,7 +95,7 @@ def stackplot(axes, x, *args,
     # We'll need a float buffer for the upcoming calculations.
     stack = np.cumsum(y, axis=0, dtype=np.promote_types(y.dtype, np.float32))
 
-    if not isinstance(baseline, int):
+    if isinstance(baseline, str):
         _api.check_in_list(['zero', 'sym', 'wiggle', 'weighted_wiggle'],
                             baseline=baseline)
     if baseline == 'zero':
@@ -128,7 +128,7 @@ def stackplot(axes, x, *args,
         stack += first_line
 
     else:
-        # Here we are 100% certain that baseline is an integer
+        # Here we are 100% certain that baseline is not a string
         first_line = float(baseline)
 
     # Color between x = 0 and the first array.

From 15dc450cd03f522e2c2383424c82aab04d75ce22 Mon Sep 17 00:00:00 2001
From: Eric Leao <86169515+EricRLeao1311@users.noreply.github.com>
Date: Sun, 19 Nov 2023 14:43:53 -0300
Subject: [PATCH 04/12] adding documentation

---
 lib/matplotlib/stackplot.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/matplotlib/stackplot.py b/lib/matplotlib/stackplot.py
index f0ff645334a8..f6ced2c92d6f 100644
--- a/lib/matplotlib/stackplot.py
+++ b/lib/matplotlib/stackplot.py
@@ -43,6 +43,7 @@ def stackplot(axes, x, *args,
           size of each layer. It is also called 'Streamgraph'-layout. More
           details can be found at http://leebyron.com/streamgraph/.
         - ``float``:  Scalar baseline. Useful for cases where 0 is not sensible.
+          Any type that can be casted to float is accepted (int, float, bool and custom data objects)
 
     labels : list of str, optional
         A sequence of labels to assign to each data series. If unspecified,

From fb74df9a9b48cdc4c11a9d09554d19f8f5dc0f57 Mon Sep 17 00:00:00 2001
From: Eric Leao <86169515+EricRLeao1311@users.noreply.github.com>
Date: Sun, 19 Nov 2023 14:46:03 -0300
Subject: [PATCH 05/12] fixing large line

---
 lib/matplotlib/stackplot.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/matplotlib/stackplot.py b/lib/matplotlib/stackplot.py
index f6ced2c92d6f..4975373bd05b 100644
--- a/lib/matplotlib/stackplot.py
+++ b/lib/matplotlib/stackplot.py
@@ -43,7 +43,8 @@ def stackplot(axes, x, *args,
           size of each layer. It is also called 'Streamgraph'-layout. More
           details can be found at http://leebyron.com/streamgraph/.
         - ``float``:  Scalar baseline. Useful for cases where 0 is not sensible.
-          Any type that can be casted to float is accepted (int, float, bool and custom data objects)
+          Any type that can be casted to float is accepted
+          (int, float, bool and custom data objects)
 
     labels : list of str, optional
         A sequence of labels to assign to each data series. If unspecified,

From 80a16f250da236f3ca42a6eddfefd8b128d704bb Mon Sep 17 00:00:00 2001
From: Eric Leao <86169515+EricRLeao1311@users.noreply.github.com>
Date: Sun, 19 Nov 2023 14:55:54 -0300
Subject: [PATCH 06/12] adding tests

---
 lib/matplotlib/tests/test_axes.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
index dffbb2377a23..1a23710c7ef0 100644
--- a/lib/matplotlib/tests/test_axes.py
+++ b/lib/matplotlib/tests/test_axes.py
@@ -3078,6 +3078,18 @@ def layers(n, m):
 
     fig, axs = plt.subplots(2, 2)
 
+    # Attempt to use an integer value for 'baseline'
+    try:
+        axs[0, 0].stackplot(range(100), d.T, baseline=5)
+    except ValueError as e:
+        print("Error when using an integer as baseline:", e)
+
+    # Attempt to use a float value for 'baseline'
+    try:
+        axs[0, 1].stackplot(range(100), d.T, baseline=2.5)
+    except ValueError as e:
+        print("Error when using a float as baseline:", e)
+
     axs[0, 0].stackplot(range(100), d.T, baseline='zero')
     axs[0, 1].stackplot(range(100), d.T, baseline='sym')
     axs[1, 0].stackplot(range(100), d.T, baseline='wiggle')

From 2ac134403987afb73a2de239e2b6dac72980ff6d Mon Sep 17 00:00:00 2001
From: Eric Leao <86169515+EricRLeao1311@users.noreply.github.com>
Date: Wed, 22 Nov 2023 22:42:01 -0300
Subject: [PATCH 07/12] fixing tests

---
 lib/matplotlib/tests/test_axes.py | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
index 1a23710c7ef0..a9fcd73f2032 100644
--- a/lib/matplotlib/tests/test_axes.py
+++ b/lib/matplotlib/tests/test_axes.py
@@ -3079,16 +3079,11 @@ def layers(n, m):
     fig, axs = plt.subplots(2, 2)
 
     # Attempt to use an integer value for 'baseline'
-    try:
-        axs[0, 0].stackplot(range(100), d.T, baseline=5)
-    except ValueError as e:
-        print("Error when using an integer as baseline:", e)
+    axs[0, 0].stackplot(range(100), d.T, baseline=5)
 
     # Attempt to use a float value for 'baseline'
-    try:
-        axs[0, 1].stackplot(range(100), d.T, baseline=2.5)
-    except ValueError as e:
-        print("Error when using a float as baseline:", e)
+    axs[0, 1].stackplot(range(100), d.T, baseline=2.5)
+
 
     axs[0, 0].stackplot(range(100), d.T, baseline='zero')
     axs[0, 1].stackplot(range(100), d.T, baseline='sym')

From 67df322064adb5d7f3823e439368eb1947c925b3 Mon Sep 17 00:00:00 2001
From: Eric Leao <86169515+EricRLeao1311@users.noreply.github.com>
Date: Wed, 22 Nov 2023 23:23:05 -0300
Subject: [PATCH 08/12] accepting datetime and timedelta

---
 lib/matplotlib/stackplot.py | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/lib/matplotlib/stackplot.py b/lib/matplotlib/stackplot.py
index 4975373bd05b..12c01308786f 100644
--- a/lib/matplotlib/stackplot.py
+++ b/lib/matplotlib/stackplot.py
@@ -45,6 +45,9 @@ def stackplot(axes, x, *args,
         - ``float``:  Scalar baseline. Useful for cases where 0 is not sensible.
           Any type that can be casted to float is accepted
           (int, float, bool and custom data objects)
+        - ``datetime64``: Calculates de difference between the date and
+            '1970-01-01' in seconds.
+        - ``timedelta64``: Converts the timedelta to seconds
 
     labels : list of str, optional
         A sequence of labels to assign to each data series. If unspecified,
@@ -129,8 +132,18 @@ def stackplot(axes, x, *args,
         first_line = center - 0.5 * total
         stack += first_line
 
+    elif isinstance(baseline, np.datetime64):
+        first_date = np.datetime64('1970-01-01')
+        baseline = baseline - first_date
+        first_line = baseline / np.timedelta64(1, 's')
+        stack += first_line
+
+    elif isinstance(baseline, np.timedelta64):
+        first_line = baseline / np.timedelta64(1, 's')
+        stack += first_line
+
     else:
-        # Here we are 100% certain that baseline is not a string
+        # Here we are 100% certain that baseline is not a string and not date-time/timedelta
         first_line = float(baseline)
 
     # Color between x = 0 and the first array.

From c3c770684d4d4261cb9a801f0464ad8e65017fbf Mon Sep 17 00:00:00 2001
From: Eric Leao <86169515+EricRLeao1311@users.noreply.github.com>
Date: Wed, 22 Nov 2023 23:25:57 -0300
Subject: [PATCH 09/12] fixing linting

---
 lib/matplotlib/stackplot.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/matplotlib/stackplot.py b/lib/matplotlib/stackplot.py
index 12c01308786f..a322a17fd051 100644
--- a/lib/matplotlib/stackplot.py
+++ b/lib/matplotlib/stackplot.py
@@ -32,7 +32,8 @@ def stackplot(axes, x, *args,
             stackplot(x, y)           # where y has shape (M, N)
             stackplot(x, y1, y2, y3)  # where y1, y2, y3, y4 have length N
 
-    baseline : {'zero', 'sym', 'wiggle', 'weighted_wiggle', float}
+    baseline : {'zero', 'sym', 'wiggle', 'weighted_wiggle', float,
+            datetime, timedelta}
         Method used to calculate the baseline:
 
         - ``'zero'``: Constant zero baseline, i.e. a simple stacked plot.
@@ -143,7 +144,8 @@ def stackplot(axes, x, *args,
         stack += first_line
 
     else:
-        # Here we are 100% certain that baseline is not a string and not date-time/timedelta
+        # Here we are 100% certain that baseline is not a
+        #string and not date-time/timedelta
         first_line = float(baseline)
 
     # Color between x = 0 and the first array.

From a4efe2292279d97939d57e4a71d93da1d735be75 Mon Sep 17 00:00:00 2001
From: Eric Leao <86169515+EricRLeao1311@users.noreply.github.com>
Date: Wed, 22 Nov 2023 23:29:18 -0300
Subject: [PATCH 10/12] fixing coment

---
 lib/matplotlib/stackplot.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/matplotlib/stackplot.py b/lib/matplotlib/stackplot.py
index a322a17fd051..66c740dec869 100644
--- a/lib/matplotlib/stackplot.py
+++ b/lib/matplotlib/stackplot.py
@@ -144,8 +144,10 @@ def stackplot(axes, x, *args,
         stack += first_line
 
     else:
-        # Here we are 100% certain that baseline is not a
-        #string and not date-time/timedelta
+        """
+        Here we are 100% certain that baseline is not a
+        string and not date-time/timedelta
+        """
         first_line = float(baseline)
 
     # Color between x = 0 and the first array.

From 197754959b2584f1e95a9840f1c316e991ad0705 Mon Sep 17 00:00:00 2001
From: Eric Leao <86169515+EricRLeao1311@users.noreply.github.com>
Date: Wed, 22 Nov 2023 23:31:12 -0300
Subject: [PATCH 11/12] fixing space lines in test

---
 lib/matplotlib/tests/test_axes.py | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
index a9fcd73f2032..3dce8fbc9d12 100644
--- a/lib/matplotlib/tests/test_axes.py
+++ b/lib/matplotlib/tests/test_axes.py
@@ -3083,14 +3083,11 @@ def layers(n, m):
 
     # Attempt to use a float value for 'baseline'
     axs[0, 1].stackplot(range(100), d.T, baseline=2.5)
-
-
     axs[0, 0].stackplot(range(100), d.T, baseline='zero')
     axs[0, 1].stackplot(range(100), d.T, baseline='sym')
     axs[1, 0].stackplot(range(100), d.T, baseline='wiggle')
     axs[1, 1].stackplot(range(100), d.T, baseline='weighted_wiggle')
 
-
 @check_figures_equal()
 def test_stackplot_hatching(fig_ref, fig_test):
     x = np.linspace(0, 10, 10)

From 460efa3d00e2b93638d1b3581205a057eb4d86c7 Mon Sep 17 00:00:00 2001
From: Eric Leao <86169515+EricRLeao1311@users.noreply.github.com>
Date: Wed, 22 Nov 2023 23:32:21 -0300
Subject: [PATCH 12/12] adding space lines in tests

---
 lib/matplotlib/tests/test_axes.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
index 3dce8fbc9d12..441dabdb80b3 100644
--- a/lib/matplotlib/tests/test_axes.py
+++ b/lib/matplotlib/tests/test_axes.py
@@ -3088,6 +3088,7 @@ def layers(n, m):
     axs[1, 0].stackplot(range(100), d.T, baseline='wiggle')
     axs[1, 1].stackplot(range(100), d.T, baseline='weighted_wiggle')
 
+
 @check_figures_equal()
 def test_stackplot_hatching(fig_ref, fig_test):
     x = np.linspace(0, 10, 10)