Create map.py

map object

map.py

@@ -0,0 +1,68 @@
+#!/usr/bin/env python
+
+import sys
+import os
+import math
+import numpy as np
+import matplotlib.pyplot as plt
+from skimage.morphology import remove_small_holes
+from PIL import Image
+dirname = os.path.dirname(__file__)
+svea = os.path.join(dirname, '../../')
+sys.path.append(os.path.abspath(svea))
+
+
+class Map:
+    """
+    Handle for map message. Contains a subscriber to the map topic and
+    processes the map. Numpy array version of the
+    map available as member variable.
+    """
+    def __init__(self, file_path, value_unknown=50, threshold_occupied=90, origin=[-30.0, -24.0], resolution=0.059999):
+
+        self.value_unknown = value_unknown
+        self.threshold_occupied = threshold_occupied
+        # instantiate member variables
+        self.data = np.array(Image.open(file_path))[:, :, 0]  # numpy array containing map data
+        #self.process_map()
+        self.height = self.data.shape[0]  # height of the map in px
+        self.width = self.data.shape[1]  # width of the map in px
+        self.resolution = resolution  # resolution of the map in m/px
+        self.origin = origin  # x and y coordinates of map origin
+        # (bottom-left corner) in m
+
+    def w2m(self, x, y):
+        """
+        World2Map. Transform coordinates from global coordinate system to
+        map coordinates.
+        :param x: x coordinate in global coordinate system
+        :param y: y coordinate in global coordinate system
+        :return: discrete x and y coordinates in px
+        """
+        d_x = np.floor((x - self.origin[0]) / self.resolution)
+        d_y = np.floor((y - self.origin[1]) / self.resolution)
+
+        return int(d_x), int(d_y)
+
+    def m2w(self, dx, dy):
+        """
+        World2Map. Transform coordinates from global coordinate system to
+        map coordinates.
+        :param x: x coordinate in global coordinate system
+        :param y: y coordinate in global coordinate system
+        :return: discrete x and y coordinates in px
+        """
+        x = dx * self.resolution + self.origin[0]
+        y = dy * self.resolution + self.origin[1]
+
+        return x, y
+
+    def process_map(self):
+        self.data = remove_small_holes(self.data, area_threshold=5,
+                                       connectivity=8).astype(np.int8)
+
+
+if __name__ == '__main__':
+    map = Map('map_floor2.png')
+    plt.imshow(map.data, cmap='gray')
+    plt.show()