102 lines
3.6 KiB
Python
102 lines
3.6 KiB
Python
from OpenGL.GL import *
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from .. GLGraphicsItem import GLGraphicsItem
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from pyqtgraph import QtGui
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import numpy as np
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__all__ = ['GLScatterPlotItem']
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class GLScatterPlotItem(GLGraphicsItem):
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"""Draws points at a list of 3D positions."""
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def __init__(self, data=None):
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GLGraphicsItem.__init__(self)
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self.data = []
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if data is not None:
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self.setData(data)
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def setData(self, data):
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"""
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Data may be either a list of dicts (one dict per point) or a numpy record array.
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==================== ==================================================
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Allowed fields are:
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------------------------------------------------------------------------
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pos (x,y,z) tuple of coordinate values or QVector3D
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color (r,g,b,a) tuple of floats (0.0-1.0) or QColor
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size (float) diameter of spot in pixels
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==================== ==================================================
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"""
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self.data = data
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self.update()
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def initializeGL(self):
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w = 64
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def fn(x,y):
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r = ((x-w/2.)**2 + (y-w/2.)**2) ** 0.5
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return 200 * (w/2. - np.clip(r, w/2.-1.0, w/2.))
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pData = np.empty((w, w, 4))
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pData[:] = 255
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pData[:,:,3] = np.fromfunction(fn, pData.shape[:2])
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#print pData.shape, pData.min(), pData.max()
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pData = pData.astype(np.ubyte)
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self.pointTexture = glGenTextures(1)
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glActiveTexture(GL_TEXTURE0)
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glEnable(GL_TEXTURE_2D)
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glBindTexture(GL_TEXTURE_2D, self.pointTexture)
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, pData.shape[0], pData.shape[1], 0, GL_RGBA, GL_UNSIGNED_BYTE, pData)
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def paint(self):
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
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glEnable( GL_BLEND )
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glEnable( GL_ALPHA_TEST )
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glEnable( GL_POINT_SMOOTH )
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glHint(GL_POINT_SMOOTH_HINT, GL_NICEST)
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#glPointParameterfv(GL_POINT_DISTANCE_ATTENUATION, (0, 0, -1e-3))
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#glPointParameterfv(GL_POINT_SIZE_MAX, (65500,))
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#glPointParameterfv(GL_POINT_SIZE_MIN, (0,))
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glEnable(GL_POINT_SPRITE)
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glActiveTexture(GL_TEXTURE0)
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glEnable( GL_TEXTURE_2D )
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glBindTexture(GL_TEXTURE_2D, self.pointTexture)
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glTexEnvi(GL_POINT_SPRITE, GL_COORD_REPLACE, GL_TRUE)
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#glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE) ## use texture color exactly
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glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ## texture modulates current color
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE)
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE)
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for pt in self.data:
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pos = pt['pos']
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try:
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color = pt['color']
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except KeyError:
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color = (1,1,1,1)
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try:
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size = pt['size']
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except KeyError:
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size = 10
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if isinstance(color, QtGui.QColor):
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color = fn.glColor(color)
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pxSize = self.view().pixelSize(QtGui.QVector3D(*pos))
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glPointSize(size / pxSize)
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glBegin( GL_POINTS )
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glColor4f(*color) # x is blue
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#glNormal3f(size, 0, 0)
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glVertex3f(*pos)
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glEnd()
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