from OpenGL.GL import *
from OpenGL.arrays import vbo
from .. GLGraphicsItem import GLGraphicsItem
from .. import shaders
from ... import QtGui
from ... import functions as fn
import numpy as np
__all__ = ['GLLinePlotItem']
[docs]class GLLinePlotItem(GLGraphicsItem):
"""Draws line plots in 3D."""
[docs] def __init__(self, **kwds):
"""All keyword arguments are passed to setData()"""
GLGraphicsItem.__init__(self)
glopts = kwds.pop('glOptions', 'additive')
self.setGLOptions(glopts)
self.pos = None
self.mode = 'line_strip'
self.width = 1.
self.color = (1.0,1.0,1.0,1.0)
self.setData(**kwds)
[docs] def setData(self, **kwds):
"""
Update the data displayed by this item. All arguments are optional;
for example it is allowed to update vertex positions while leaving
colors unchanged, etc.
==================== ==================================================
**Arguments:**
------------------------------------------------------------------------
pos (N,3) array of floats specifying point locations.
color (N,4) array of floats (0.0-1.0) or
tuple of floats specifying
a single color for the entire item.
width float specifying line width
antialias enables smooth line drawing
mode 'lines': Each pair of vertexes draws a single line
segment.
'line_strip': All vertexes are drawn as a
continuous set of line segments.
==================== ==================================================
"""
args = ['pos', 'color', 'width', 'mode', 'antialias']
for k in kwds.keys():
if k not in args:
raise Exception('Invalid keyword argument: %s (allowed arguments are %s)' % (k, str(args)))
self.antialias = False
for arg in args:
if arg in kwds:
setattr(self, arg, kwds[arg])
#self.vbo.pop(arg, None)
self.update()
def paint(self):
if self.pos is None:
return
self.setupGLState()
glEnableClientState(GL_VERTEX_ARRAY)
try:
glVertexPointerf(self.pos)
if isinstance(self.color, np.ndarray):
glEnableClientState(GL_COLOR_ARRAY)
glColorPointerf(self.color)
else:
if isinstance(self.color, (str, QtGui.QColor)):
glColor4f(*fn.glColor(self.color))
else:
glColor4f(*self.color)
glLineWidth(self.width)
if self.antialias:
glEnable(GL_LINE_SMOOTH)
glEnable(GL_BLEND)
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
glHint(GL_LINE_SMOOTH_HINT, GL_NICEST)
if self.mode == 'line_strip':
glDrawArrays(GL_LINE_STRIP, 0, int(self.pos.size / self.pos.shape[-1]))
elif self.mode == 'lines':
glDrawArrays(GL_LINES, 0, int(self.pos.size / self.pos.shape[-1]))
else:
raise Exception("Unknown line mode '%s'. (must be 'lines' or 'line_strip')" % self.mode)
finally:
glDisableClientState(GL_COLOR_ARRAY)
glDisableClientState(GL_VERTEX_ARRAY)