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Updated GLScatterPlotItem for performance.

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This commit is contained in:
Luke Campagnola 2012-10-26 00:09:47 -04:00
parent 8551a990c6
commit bbba3f1f78
2 changed files with 113 additions and 46 deletions
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54
examples/GLScatterPlotItem.py
View File

@ -5,6 +5,7 @@ sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', '..'))
from pyqtgraph.Qt import QtCore, QtGui
import pyqtgraph.opengl as gl
import numpy as np
app = QtGui.QApplication([])
w = gl.GLViewWidget()
@ -14,18 +15,47 @@ w.show()
g = gl.GLGridItem()
w.addItem(g)
pts = [
{'pos': (1,0,0), 'size':0.5, 'color':(1.0, 0.0, 0.0, 0.5)},
{'pos': (0,1,0), 'size':0.2, 'color':(0.0, 0.0, 1.0, 0.5)},
{'pos': (0,0,1), 'size':2./3., 'color':(0.0, 1.0, 0.0, 0.5)},
]
z = 0.5
d = 6.0
for i in range(50):
pts.append({'pos': (0,0,z), 'size':2./d, 'color':(0.0, 1.0, 0.0, 0.5)})
z *= 0.5
d *= 2.0
sp = gl.GLScatterPlotItem(pts)
#pos = np.empty((53, 3))
#size = np.empty((53))
#color = np.empty((53, 4))
#pos[0] = (1,0,0); size[0] = 0.5; color[0] = (1.0, 0.0, 0.0, 0.5)
#pos[1] = (0,1,0); size[1] = 0.2; color[1] = (0.0, 0.0, 1.0, 0.5)
#pos[2] = (0,0,1); size[2] = 2./3.; color[2] = (0.0, 1.0, 0.0, 0.5)
#z = 0.5
#d = 6.0
#for i in range(3,53):
#pos[i] = (0,0,z)
#size[i] = 2./d
#color[i] = (0.0, 1.0, 0.0, 0.5)
#z *= 0.5
#d *= 2.0
#sp = gl.GLScatterPlotItem(pos=pos, sizes=size, colors=color, pxMode=False)
pos = (np.random.random(size=(100000,3)) * 10) - 5
color = np.ones((pos.shape[0], 4))
d = (pos**2).sum(axis=1)**0.5
color[:,3] = np.clip(-np.cos(d*2) * 0.2, 0, 1)
sp = gl.GLScatterPlotItem(pos=pos, color=color, size=5)
phase = 0.
def update():
global phase, color, sp, d
s = -np.cos(d*2+phase)
color[:,3] = np.clip(s * 0.2, 0, 1)
color[:,0] = np.clip(s * 3.0, 0, 1)
color[:,1] = np.clip(s * 1.0, 0, 1)
color[:,2] = np.clip(s ** 3, 0, 1)
sp.setData(color=color)
phase -= 0.1
t = QtCore.QTimer()
t.timeout.connect(update)
t.start(50)
w.addItem(sp)
## Start Qt event loop unless running in interactive mode.

105
opengl/items/GLScatterPlotItem.py
View File

@ -8,31 +8,47 @@ __all__ = ['GLScatterPlotItem']
class GLScatterPlotItem(GLGraphicsItem):
"""Draws points at a list of 3D positions."""
def __init__(self, data=None):
def __init__(self, **kwds):
GLGraphicsItem.__init__(self)
self.data = []
if data is not None:
self.setData(data)
self.pos = []
self.size = 10
self.color = [1.0,1.0,1.0,0.5]
self.pxMode = True
self.setData(**kwds)
def setData(self, data):
def setData(self, **kwds):
"""
Data may be either a list of dicts (one dict per point) or a numpy record array.
Update the data displayed by this item. All arguments are optional;
for example it is allowed to update spot positions while leaving
colors unchanged, etc.
==================== ==================================================
Allowed fields are:
Arguments:
------------------------------------------------------------------------
pos (x,y,z) tuple of coordinate values or QVector3D
color (r,g,b,a) tuple of floats (0.0-1.0) or QColor
size (float) diameter of spot
pos (N,3) array of floats specifying point locations.
color (N,4) array of floats (0.0-1.0) specifying
spot colors OR a tuple of floats specifying
a single color for all spots.
size (N,) array of floats specifying spot sizes or
a single value to apply to all spots.
pxMode If True, spot sizes are expressed in pixels.
Otherwise, they are expressed in item coordinates.
==================== ==================================================
"""
self.data = data
args = ['pos', 'color', 'size', 'pxMode']
for k in kwds.keys():
if k not in args:
raise Exception('Invalid keyword argument: %s (allowed arguments are %s)' % (k, str(args)))
self.pos = kwds.get('pos', self.pos)
self.color = kwds.get('color', self.color)
self.size = kwds.get('size', self.size)
self.pxMode = kwds.get('pxMode', self.pxMode)
self.update()
def initializeGL(self):
## Generate texture for rendering points
w = 64
def fn(x,y):
r = ((x-w/2.)**2 + (y-w/2.)**2) ** 0.5
@ -73,28 +89,49 @@ class GLScatterPlotItem(GLGraphicsItem):
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE)
for pt in self.data:
pos = pt['pos']
try:
color = pt['color']
except KeyError:
color = (1,1,1,1)
try:
size = pt['size']
except KeyError:
size = 10
if isinstance(color, QtGui.QColor):
color = fn.glColor(color)
pxSize = self.view().pixelSize(QtGui.QVector3D(*pos))
if self.pxMode:
glVertexPointerf(self.pos)
if isinstance(self.color, np.ndarray):
glColorPointerf(self.color)
else:
if isinstance(self.color, QtGui.QColor):
glColor4f(*fn.glColor(self.color))
else:
glColor4f(*self.color)
glPointSize(size / pxSize)
glBegin( GL_POINTS )
glColor4f(*color) # x is blue
#glNormal3f(size, 0, 0)
glVertex3f(*pos)
glEnd()
if isinstance(self.size, np.ndarray):
raise Exception('Array size not yet supported in pxMode (hopefully soon)')
glPointSize(self.size)
glEnableClientState(GL_VERTEX_ARRAY)
glEnableClientState(GL_COLOR_ARRAY)
glDrawArrays(GL_POINTS, 0, len(self.pos))
else:
for i in range(len(self.pos)):
pos = self.pos[i]
if isinstance(self.color, np.ndarray):
color = self.color[i]
else:
color = self.color
if isinstance(self.color, QtGui.QColor):
color = fn.glColor(self.color)
if isinstance(self.size, np.ndarray):
size = self.size[i]
else:
size = self.size
pxSize = self.view().pixelSize(QtGui.QVector3D(*pos))
glPointSize(size / pxSize)
glBegin( GL_POINTS )
glColor4f(*color) # x is blue
#glNormal3f(size, 0, 0)
glVertex3f(*pos)
glEnd()