1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
# -*- coding: utf-8 -*-
# -----------------------------------------------------------------------------
# Copyright (c) 2014, Nicolas P. Rougier
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
# -----------------------------------------------------------------------------
"""
Antigrain Geometry Path Collection
This collection provides antialiased and accurate paths with caps and joins. It
is memory hungry (x8) and slow (x.25) so it is to be used sparingly, mainly for
thick paths where quality is critical.
"""
import numpy as np
from ... import glsl
from ... import gloo
from . collection import Collection
from ..transforms import NullTransform
class AggPathCollection(Collection):
"""
Antigrain Geometry Path Collection
This collection provides antialiased and accurate paths with caps and
joins. It is memory hungry (x8) and slow (x.25) so it is to be used
sparingly, mainly for thick paths where quality is critical.
"""
def __init__(self, user_dtype=None, transform=None,
vertex=None, fragment=None, **kwargs):
"""
Initialize the collection.
Parameters
----------
user_dtype: list
The base dtype can be completed (appended) by the used_dtype. It
only make sense if user also provide vertex and/or fragment shaders
transform : Transform instance
Used to define the transform(vec4) function
vertex: string
Vertex shader code
fragment: string
Fragment shader code
caps : string
'local', 'shared' or 'global'
join : string
'local', 'shared' or 'global'
color : string
'local', 'shared' or 'global'
miter_limit : string
'local', 'shared' or 'global'
linewidth : string
'local', 'shared' or 'global'
antialias : string
'local', 'shared' or 'global'
"""
base_dtype = [('p0', (np.float32, 3), '!local', (0, 0, 0)),
('p1', (np.float32, 3), '!local', (0, 0, 0)),
('p2', (np.float32, 3), '!local', (0, 0, 0)),
('p3', (np.float32, 3), '!local', (0, 0, 0)),
('uv', (np.float32, 2), '!local', (0, 0)),
('caps', (np.float32, 2), 'global', (0, 0)),
('join', (np.float32, 1), 'global', 0),
('color', (np.float32, 4), 'global', (0, 0, 0, 1)),
('miter_limit', (np.float32, 1), 'global', 4),
('linewidth', (np.float32, 1), 'global', 1),
('antialias', (np.float32, 1), 'global', 1),
('viewport', (np.float32, 4), 'global', (0, 0, 512, 512))] # noqa
dtype = base_dtype
if user_dtype:
dtype.extend(user_dtype)
if vertex is None:
vertex = glsl.get('collections/agg-path.vert')
if transform is None:
transform = NullTransform()
self.transform = transform
if fragment is None:
fragment = glsl.get('collections/agg-path.frag')
Collection.__init__(self, dtype=dtype, itype=np.uint32, # 16 for WebGL
mode="triangles",
vertex=vertex, fragment=fragment, **kwargs)
self._programs[0].vert['transform'] = self.transform
def append(self, P, closed=False, itemsize=None, **kwargs):
"""
Append a new set of vertices to the collection.
For kwargs argument, n is the number of vertices (local) or the number
of item (shared)
Parameters
----------
P : np.array
Vertices positions of the path(s) to be added
closed: bool
Whether path(s) is/are closed
itemsize: int or None
Size of an individual path
caps : list, array or 2-tuple
Path start /end cap
join : list, array or float
path segment join
color : list, array or 4-tuple
Path color
miter_limit : list, array or float
Miter limit for join
linewidth : list, array or float
Path linewidth
antialias : list, array or float
Path antialias area
"""
itemsize = int(itemsize or len(P))
itemcount = len(P) // itemsize
# Computes the adjacency information
n, p = len(P), P.shape[-1]
Z = np.tile(P, 2).reshape(2 * len(P), p)
V = np.empty(n, dtype=self.vtype)
V['p0'][1:-1] = Z[0::2][:-2]
V['p1'][:-1] = Z[1::2][:-1]
V['p2'][:-1] = Z[1::2][+1:]
V['p3'][:-2] = Z[0::2][+2:]
# Apply default values on vertices
for name in self.vtype.names:
if name not in ['collection_index', 'p0', 'p1', 'p2', 'p3']:
V[name] = kwargs.get(name, self._defaults[name])
# Extract relevant segments only
V = (V.reshape(n // itemsize, itemsize)[:, :-1])
if closed:
V['p0'][:, 0] = V['p2'][:, -1]
V['p3'][:, -1] = V['p1'][:, 0]
else:
V['p0'][:, 0] = V['p1'][:, 0]
V['p3'][:, -1] = V['p2'][:, -1]
V = V.ravel()
# Quadruple each point (we're using 2 triangles / segment)
# No shared vertices between segment because of joins
V = np.repeat(V, 4, axis=0).reshape((len(V), 4))
V['uv'] = (-1, -1), (-1, +1), (+1, -1), (+1, +1)
V = V.ravel()
n = itemsize
if closed:
# uint16 for WebGL
idxs = np.resize(
np.array([0, 1, 2, 1, 2, 3], dtype=np.uint32), n * 2 * 3)
idxs += np.repeat(4 * np.arange(n, dtype=np.uint32), 6)
idxs[-6:] = 4 * n - 6, 4 * n - 5, 0, 4 * n - 5, 0, 1
else:
idxs = np.resize(
np.array([0, 1, 2, 1, 2, 3], dtype=np.uint32), (n - 1) * 2 * 3)
idxs += np.repeat(4 * np.arange(n - 1, dtype=np.uint32), 6)
idxs = idxs.ravel()
# Uniforms
if self.utype:
U = np.zeros(itemcount, dtype=self.utype)
for name in self.utype.names:
if name not in ["__unused__"]:
U[name] = kwargs.get(name, self._defaults[name])
else:
U = None
Collection.append(self, vertices=V, uniforms=U,
indices=idxs, itemsize=itemsize * 4 - 4)
def draw(self, mode="triangles"):
"""Draw collection"""
gloo.set_depth_mask(0)
Collection.draw(self, mode)
gloo.set_depth_mask(1)
|
