from vispy.visuals import CompoundVisual, LineVisual, MeshVisual from vispy.scene.visuals import create_visual_node from vispy.gloo import set_state from vispy.geometry.triangulation import Triangulation from vispy.color import Color from shapely.geometry import Polygon, LineString, LinearRing import numpy as np try: from shapely.ops import triangulate import Polygon as gpc except: pass # Add clear_data method to LineVisual def clear_data(self): self._bounds = None self._pos = None self._changed['pos'] = True self.update() LineVisual.clear_data = clear_data class ShapeGroup(object): def __init__(self, collection): self._collection = collection self._indexes = [] self._visible = True def add(self, shape, color=None, face_color=None, visible=True, update=False, layer=1, order=0): self._indexes.append(self._collection.add(shape, color, face_color, visible, update, layer, order)) def clear(self, update=False): for i in self._indexes: self._collection.remove(i, False) del self._indexes[:] if update: self._collection.redraw() def redraw(self): self._collection.redraw() @property def visible(self): return self._visible @visible.setter def visible(self, value): self._visible = value for i in self._indexes: self._collection.data[i]['visible'] = value self._collection.redraw() class ShapeCollectionVisual(CompoundVisual): total_segments = 0 total_tris = 0 def __init__(self, line_width=1, triangulation='gpc', layers=3, **kwargs): self.data = {} self.last_key = -1 self._meshes = [MeshVisual() for _ in range(0, layers)] self._lines = [LineVisual(antialias=True) for _ in range(0, layers)] self._line_width = line_width self._triangulation = triangulation visuals = [self._lines[i / 2] if i % 2 else self._meshes[i / 2] for i in range(0, layers * 2)] CompoundVisual.__init__(self, visuals, **kwargs) for m in self._meshes: m.set_gl_state(polygon_offset_fill=True, polygon_offset=(1, 1), cull_face=False) for l in self._lines: l.set_gl_state(blend=True) self.freeze() def add(self, shape, color=None, face_color=None, visible=True, update=False, layer=1, order=0): self.last_key += 1 self.data[self.last_key] = {'geometry': shape, 'color': color, 'face_color': face_color, 'visible': visible, 'layer': layer, 'order': order} self.update_shape_buffers(self.last_key) if update: self._update() return self.last_key def update_shape_buffers(self, key): mesh_vertices = [] # Vertices for mesh mesh_tris = [] # Faces for mesh mesh_colors = [] # Face colors line_pts = [] # Vertices for line line_colors = [] # Line color geo, color, face_color = self.data[key]['geometry'], self.data[key]['color'], self.data[key]['face_color'] if geo is not None and not geo.is_empty: simple = geo.simplify(0.01) # Simplified shape pts = [] # Shape line points tri_pts = [] # Mesh vertices tri_tris = [] # Mesh faces if type(geo) == LineString: # Prepare lines pts = self._linestring_to_segments(np.asarray(simple)).tolist() elif type(geo) == LinearRing: # Prepare lines pts = self._linearring_to_segments(np.asarray(simple)).tolist() elif type(geo) == Polygon: # Prepare polygon faces if face_color is not None: if self._triangulation == 'vispy': # VisPy triangulation # Concatenated arrays of external & internal line rings vertices = self._open_ring(np.asarray(simple.exterior)) edges = self._generate_edges(len(vertices)) for ints in simple.interiors: v = self._open_ring(np.asarray(ints)) edges = np.append(edges, self._generate_edges(len(v)) + len(vertices), 0) vertices = np.append(vertices, v, 0) tri = Triangulation(vertices, edges) tri.triangulate() tri_pts, tri_tris = tri.pts.tolist(), tri.tris.tolist() elif self._triangulation == 'gpc': # GPC triangulation p = gpc.Polygon(np.asarray(simple.exterior)) for ints in simple.interiors: q = gpc.Polygon(np.asarray(ints)) p -= q for strip in p.triStrip(): # Generate tris indexes for triangle strips a = [[x + y for x in range(0, 3)] for y in range(0, len(strip) - 2)] # Append vertices & tris tri_tris += [[x + len(tri_pts) for x in y] for y in a] tri_pts += strip # Prepare polygon edges if color is not None: pts = self._linearring_to_segments(np.asarray(simple.exterior)).tolist() for ints in simple.interiors: pts += self._linearring_to_segments(np.asarray(ints)).tolist() # Appending data for mesh if len(tri_pts) > 0 and len(tri_tris) > 0: mesh_tris += tri_tris mesh_vertices += tri_pts mesh_colors += [Color(face_color).rgba] * len(tri_tris) # Appending data for line if len(pts) > 0: line_pts += pts line_colors += [Color(color).rgba] * len(pts) # Store buffers self.data[key]['line_pts'] = line_pts self.data[key]['line_colors'] = line_colors self.data[key]['mesh_vertices'] = mesh_vertices self.data[key]['mesh_tris'] = mesh_tris self.data[key]['mesh_colors'] = mesh_colors def remove(self, key, update=False): self.data.pop(key) if update: self._update() def clear(self, update=False): self.data.clear() if update: self._update() def _update(self): mesh_vertices = [[] for _ in range(0, len(self._meshes))] # Vertices for mesh mesh_tris = [[] for _ in range(0, len(self._meshes))] # Faces for mesh mesh_colors = [[] for _ in range(0, len(self._meshes))] # Face colors line_pts = [[] for _ in range(0, len(self._lines))] # Vertices for line line_colors = [[] for _ in range(0, len(self._lines))] # Line color # Merge shapes buffers for data in self.data.values(): if data['visible']: try: line_pts[data['layer']] += data['line_pts'] line_colors[data['layer']] += data['line_colors'] mesh_tris[data['layer']] += [[x + len(mesh_vertices[data['layer']]) for x in y] for y in data['mesh_tris']] mesh_vertices[data['layer']] += data['mesh_vertices'] mesh_colors[data['layer']] += data['mesh_colors'] except Exception as e: print "Data error", e # Updating meshes for i, mesh in enumerate(self._meshes): if len(mesh_vertices[i]) > 0: set_state(polygon_offset_fill=False) mesh.set_data(np.asarray(mesh_vertices[i]), np.asarray(mesh_tris[i], dtype=np.uint32), face_colors=np.asarray(mesh_colors[i])) else: mesh.set_data() mesh._bounds_changed() # Updating lines for i, line in enumerate(self._lines): if len(line_pts[i]) > 0: line.set_data(np.asarray(line_pts[i]), np.asarray(line_colors[i]), self._line_width, 'segments') else: line.clear_data() line._bounds_changed() self._bounds_changed() def redraw(self): self._update() @staticmethod def _open_ring(vertices): return vertices[:-1] if not np.any(vertices[0] != vertices[-1]) else vertices @staticmethod def _generate_edges(count): edges = np.empty((count, 2), dtype=np.uint32) edges[:, 0] = np.arange(count) edges[:, 1] = edges[:, 0] + 1 edges[-1, 1] = 0 return edges @staticmethod def _linearring_to_segments(arr): # Close linear ring if np.any(arr[0] != arr[-1]): arr = np.concatenate([arr, arr[:1]], axis=0) return ShapeCollection._linestring_to_segments(arr) @staticmethod def _linestring_to_segments(arr): return np.asarray(np.repeat(arr, 2, axis=0)[1:-1]) ShapeCollection = create_visual_node(ShapeCollectionVisual)