From 235123e65b5edb3d5f0c8f14b05e2d2e56f9e40a Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Tue, 24 Mar 2020 20:51:06 +0100
Subject: Separate classes into modules

---
 boltzgas/visual/histogram.py | 125 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 boltzgas/visual/histogram.py

(limited to 'boltzgas/visual/histogram.py')

diff --git a/boltzgas/visual/histogram.py b/boltzgas/visual/histogram.py
new file mode 100644
index 0000000..2f90b8b
--- /dev/null
+++ b/boltzgas/visual/histogram.py
@@ -0,0 +1,125 @@
+from OpenGL.GL import *
+
+import numpy as np
+
+import scipy.stats as stats
+import scipy.constants as const
+from scipy.optimize import minimize
+
+import matplotlib
+import matplotlib.pyplot as plt
+
+from concurrent.futures import Future, ProcessPoolExecutor
+
+def get_histogram(velocities, char_u):
+    maxwellian = stats.maxwell.fit(velocities)
+
+    plt.style.use('dark_background')
+
+    fig = plt.figure(figsize=(8,8))
+    ax = fig.add_axes([0.1, 0.06, 0.88, 0.92])
+
+    plt.ylim(0, 0.003)
+    plt.ylabel('Probability')
+
+    plt.xlim(0, 1.2*char_u)
+    plt.xlabel('Velocity magnitude [m/s]')
+
+    plt.hist(velocities, bins=50, density=True, alpha=0.5, label='Simulated velocities')
+
+    xs = np.linspace(0, 1.2*char_u, 100)
+    plt.plot(xs, stats.maxwell.pdf(xs, *maxwellian), label='Maxwell-Boltzmann distribution')
+
+    plt.legend(loc='upper right')
+
+    fig.canvas.draw()
+    buf = fig.canvas.tostring_rgb()
+    width, height = fig.canvas.get_width_height()
+    texture = np.frombuffer(buf, dtype=np.uint8).reshape(width, height, 3)
+
+    plt.close(fig)
+
+    return (texture, height, width)
+
+
+class VelocityHistogram:
+    def __init__(self, gas, origin, extend):
+        self.gas = gas
+        self.origin = origin
+        self.extend = extend
+        self.steps = -1
+
+        self.pool = ProcessPoolExecutor(max_workers=1)
+        self.plotter = None
+
+        self.tick = False
+        self.mixing = 0.0
+
+    def setup(self):
+        self.vertices = np.array([
+            self.origin[0]                 , self.origin[1]                 , 0., 1.,
+            self.origin[0] + self.extend[0], self.origin[1]                 , 1., 1.,
+            self.origin[0]                 , self.origin[1] + self.extend[1], 0., 0.,
+            self.origin[0] + self.extend[0], self.origin[1] + self.extend[1], 1., 0.
+        ], dtype=np.float32)
+
+        self.vao = glGenVertexArrays(1)
+        self.vbo = glGenBuffers(1)
+
+        glBindVertexArray(self.vao)
+        glBindBuffer(GL_ARRAY_BUFFER, self.vbo)
+        glBufferData(GL_ARRAY_BUFFER, self.vertices.tostring(), GL_STATIC_DRAW)
+
+        glEnableVertexAttribArray(0)
+        glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4*np.dtype(np.float32).itemsize, ctypes.c_void_p(0))
+        glEnableVertexAttribArray(1)
+        glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4*np.dtype(np.float32).itemsize, ctypes.c_void_p(2*np.dtype(np.float32).itemsize))
+
+        self.texture_id = glGenTextures(2)
+
+        glBindTexture(GL_TEXTURE_2D, self.texture_id[0])
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+        glBindTexture(GL_TEXTURE_2D, self.texture_id[1])
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+    def update(self):
+        self.steps = self.steps + 1
+
+        if self.steps % 50 == 0 and self.plotter == None:
+            self.plotter = self.pool.submit(get_histogram, self.gas.get_velocity_norms(), self.gas.char_u)
+
+        else:
+            if self.plotter != None and self.plotter.done():
+                texture, width, height = self.plotter.result()
+                if self.tick:
+                    glBindTexture(GL_TEXTURE_2D, self.texture_id[0])
+                    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, texture)
+                    self.tick = False
+                    self.mixing = 1.0
+
+                else:
+                    glBindTexture(GL_TEXTURE_2D, self.texture_id[1])
+                    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, texture)
+                    self.tick = True
+                    self.mixing = 0.0
+
+                self.plotter = None
+
+
+    def display(self, uniform):
+        if self.tick:
+            self.mixing = min(self.mixing+0.1, 1.0);
+        else:
+            self.mixing = max(self.mixing-0.1, 0.0);
+
+        glBindTextures(self.texture_id[0], 2, self.texture_id)
+        glUniform1iv(uniform['picture'], len(self.texture_id), self.texture_id)
+        glUniform1f(uniform['mixing'], self.mixing)
+
+        glBindVertexArray(self.vao);
+        glDrawArrays(GL_TRIANGLE_STRIP, 0, 4)
+        glBindVertexArray(0)
+
-- 
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