Merge pull request #68 from devbrones/master

Support for returning plots instead of showing them directly

fdtd/visualization.py

@@ -37,11 +37,12 @@ def visualize(
     srccolor="C0",
     detcolor="C2",
     norm="linear",
-    show=False,  # default False to allow animate to be true
     animate=False,  # True to see frame by frame states of grid while running simulation
     index=None,  # index for each frame of animation (visualize fn runs in a loop, loop variable is passed as index)
     save=False,  # True to save frames (requires parameters index, folder)
     folder=None,  # folder path to save frames
+    show=False,  # default False to allow animate to be true
+    style=None,
 ):
     """visualize a projection of the grid and the optical energy inside the grid
 
@@ -61,7 +62,10 @@ def visualize(
         index: index for each frame of animation (typically a loop variable is passed)
         save: save frames in a folder
         folder: path to folder to save frames
+        style: Matplotlib style sheet to use for plotting. e.g. "https://raw.githubusercontent.com/dracula/matplotlib/master/dracula.mplstyle".
     """
+    if style is not None:
+        plt.style.use(style)
     if norm not in ("linear", "lin", "log"):
         raise ValueError("Color map normalization should be 'linear' or 'log'.")
     # imports (placed here to circumvent circular imports)
@@ -116,7 +120,7 @@ def visualize(
     plt.plot([], lw=3, color=detcolor, label="Detectors")
 
     # Grid energy
-    grid_energy = bd.sum(grid.E ** 2 + grid.H ** 2, -1)
+    grid_energy = bd.sum(grid.E**2 + grid.H**2, -1)
     if x is not None:
         assert grid.Ny > 1 and grid.Nz > 1
         xlabel, ylabel = "y", "z"
@@ -309,7 +313,9 @@ def visualize(
     cmap_norm = None
     if norm == "log":
         cmap_norm = LogNorm(vmin=1e-4, vmax=grid_energy.max() + 1e-4)
-    plt.imshow(abs(bd.numpy(grid_energy)), cmap=cmap, interpolation="sinc", norm=cmap_norm)
+    plt.imshow(
+        abs(bd.numpy(grid_energy)), cmap=cmap, interpolation="sinc", norm=cmap_norm
+    )
 
     # finalize the plot
     plt.ylabel(xlabel)
@@ -327,8 +333,12 @@ def visualize(
     if show:
         plt.show()
 
+    return plt.gcf()  # return figure for gradio support
+
 
-def dB_map_2D(block_det=None, choose_axis=2, interpolation="spline16"):
+def dB_map_2D(
+    block_det=None, choose_axis=2, interpolation="spline16", show=True, style=None
+):
     """
     Displays detector readings from an 'fdtd.BlockDetector' in a decibel map spanning a 2D slice region inside the BlockDetector.
     Compatible with continuous sources (not pulse).
@@ -338,6 +348,8 @@ def dB_map_2D(block_det=None, choose_axis=2, interpolation="spline16"):
         block_det (numpy array): 5 axes numpy array (timestep, row, column, height, {x, y, z} parameter) created by 'fdtd.BlockDetector'.
         (optional) choose_axis (int): Choose between {0, 1, 2} to display {x, y, z} data. Default 2 (-> z).
         (optional) interpolation (string): Preferred 'matplotlib.pyplot.imshow' interpolation. Default "spline16".
+        show (bool): automatically call plt.show at the end of the plotting function
+        style (string): Matplotlib style sheet to use for plotting. e.g. "https://raw.githubusercontent.com/dracula/matplotlib/master/dracula.mplstyle".
     """
     if block_det is None:
         raise ValueError(
@@ -349,7 +361,8 @@ def dB_map_2D(block_det=None, choose_axis=2, interpolation="spline16"):
         )
 
     # TODO: convert all 2D slices (y-z, x-z plots) into x-y plot data structure
-
+    if style is not None:
+        plt.style.use(style)
     plt.ioff()
     plt.close()
     a = []  # array to store wave intensities
@@ -360,24 +373,28 @@ def dB_map_2D(block_det=None, choose_axis=2, interpolation="spline16"):
             a[i].append(max(temp) - min(temp))
 
     peakVal, minVal = max(map(max, a)), min(map(min, a))
-    #print(
+    # print(
     #    "Peak at:",
     #    [
     #        [[i, j] for j, y in enumerate(x) if y == peakVal]
     #        for i, x in enumerate(a)
     #        if peakVal in x
     #    ],
-    #)
+    # )
     a = 10 * log10([[y / minVal for y in x] for x in a])
 
     plt.title("dB map of Electrical waves in detector region")
     plt.imshow(a, cmap="inferno", interpolation=interpolation)
     cbar = plt.colorbar()
     cbar.ax.set_ylabel("dB scale", rotation=270)
-    plt.show()
 
+    if show:
+        plt.show()
+
+    return plt.gcf()
 
-def plot_detection(detector_dict=None, specific_plot=None):
+
+def plot_detection(detector_dict=None, specific_plot=None, show=True, style=None):
     """
     1. Plots intensity readings on array of 'fdtd.LineDetector' as a function of timestep.
     2. Plots time of arrival of pulse at different LineDetector in array.
@@ -387,6 +404,8 @@ def plot_detection(detector_dict=None, specific_plot=None):
         detector_dict (dictionary): Dictionary of detector readings, as created by 'fdtd.Grid.save_data()'.
         (optional) specific_plot (string): Plot for a specific axis data. Choose from {"Ex", "Ey", "Ez", "Hx", "Hy", "Hz"}.
     """
+    if style is not None:
+        plt.style.use(style)
     if detector_dict is None:
         raise Exception(
             "Function plotDetection() requires a dictionary of detector readings as 'detector_dict' parameter."
@@ -464,7 +483,10 @@ def plot_detection(detector_dict=None, specific_plot=None):
         plt.xlabel("Time of arrival (time steps)")
         plt.legend()
         plt.suptitle("Time-of-arrival plot")
-    plt.show()
+    if show:
+        plt.show()
+
+    return plt.gcf()
 
 
 #