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# -*- coding: utf-8 -*-
# -----------------------------------------------------------------------------
# Copyright (c) 2014, Nicolas P. Rougier
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
# -----------------------------------------------------------------------------
"""
Antigrain Geometry Segment Collection
This collection provides antialiased and accurate segments with caps. It
consume x2 more memory than regular lines and is a bit slower, but the quality
of the output is worth the cost.
"""
import numpy as np
from ... import glsl
from . collection import Collection
from ..transforms import NullTransform
class AggSegmentCollection(Collection):
"""
Antigrain Geometry Segment Collection
This collection provides antialiased and accurate segments with caps. It
consume x2 more memory than regular lines and is a bit slower, but the
quality of the output is worth the cost.
"""
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 : string
GLSL Transform code defining the vec4 transform(vec3) function
vertex: string
Vertex shader code
fragment: string
Fragment shader code
caps : string
'local', 'shared' or 'global'
color : 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)),
('index', (np.float32, 1), '!local', 0),
('color', (np.float32, 4), 'shared', (0, 0, 0, 1)),
('linewidth', (np.float32, 1), 'shared', 1),
('antialias', (np.float32, 1), 'shared', 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-segment.vert')
if transform is None:
transform = NullTransform()
self.transform = transform
if fragment is None:
fragment = glsl.get('collections/agg-segment.frag')
Collection.__init__(self, dtype=dtype, itype=np.uint32,
mode="triangles",
vertex=vertex, fragment=fragment, **kwargs)
self._programs[0].vert['transform'] = self.transform
def append(self, P0, P1, itemsize=None, **kwargs):
"""
Append a new set of segments 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
itemsize: int or None
Size of an individual path
caps : list, array or 2-tuple
Path start /end cap
color : list, array or 4-tuple
Path color
linewidth : list, array or float
Path linewidth
antialias : list, array or float
Path antialias area
"""
itemsize = itemsize or 1
itemcount = len(P0) // itemsize
V = np.empty(itemcount, dtype=self.vtype)
# Apply default values on vertices
for name in self.vtype.names:
if name not in ['collection_index', 'P0', 'P1', 'index']:
V[name] = kwargs.get(name, self._defaults[name])
V['P0'] = P0
V['P1'] = P1
V = V.repeat(4, axis=0)
V['index'] = np.resize([0, 1, 2, 3], 4 * itemcount * itemsize)
idxs = np.ones((itemcount, 6), dtype=int)
idxs[:] = 0, 1, 2, 0, 2, 3
idxs[:] += 4 * np.arange(itemcount)[:, np.newaxis]
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=4 * itemcount)
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