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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.
# -----------------------------------------------------------------------------
"""
Raw Point Collection
This collection provides very fast points. Output quality is ugly so it must be
used at small size only (2/3 pixels). You've been warned.
"""
from __future__ import division
import numpy as np
from ... import glsl
from . collection import Collection
from ..transforms import NullTransform
class RawPointCollection(Collection):
"""
Raw Point Collection
This collection provides very fast points. Output quality is ugly so it
must be used at small size only (2/3 pixels). You've been warned.
"""
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
color : string
'local', 'shared' or 'global'
"""
base_dtype = [('position', (np.float32, 3), "!local", (0, 0, 0)),
('size', (np.float32, 1), "global", 3.0),
('color', (np.float32, 4), "global", (0, 0, 0, 1))]
dtype = base_dtype
if user_dtype:
dtype.extend(user_dtype)
if vertex is None:
vertex = glsl.get("collections/raw-point.vert")
if transform is None:
transform = NullTransform()
self.transform = transform
if fragment is None:
fragment = glsl.get("collections/raw-point.frag")
Collection.__init__(self, dtype=dtype, itype=None, mode="points",
vertex=vertex, fragment=fragment, **kwargs)
# Set hooks if necessary
program = self._programs[0]
program.vert['transform'] = self.transform
def append(self, P, 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 points(s) to be added
itemsize: int or None
Size of an individual path
color : list, array or 4-tuple
Path color
"""
itemsize = itemsize or 1
itemcount = len(P) // itemsize
V = np.empty(len(P), dtype=self.vtype)
# Apply default values on vertices
for name in self.vtype.names:
if name not in ['position', "collection_index"]:
V[name] = kwargs.get(name, self._defaults[name])
V["position"] = P
# 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, itemsize=itemsize)
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