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Added GL picking, matrix retrieval methods

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This commit is contained in:
Luke Campagnola 2013-07-04 11:21:50 -04:00
parent 934e50ad55
commit a20e732f65
1 changed files with 49 additions and 18 deletions
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67
pyqtgraph/opengl/GLViewWidget.py
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@ -80,23 +80,26 @@ class GLViewWidget(QtOpenGL.QGLWidget):
#self.update()
def setProjection(self, region=None):
m = self.projectionMatrix(region)
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
a = np.array(m.copyDataTo()).reshape((4,4))
glMultMatrixf(a.transpose())
def projectionMatrix(self, region=None):
# Xw = (Xnd + 1) * width/2 + X
if region is None:
region = (0, 0, self.width(), self.height())
## Create the projection matrix
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
#w = self.width()
#h = self.height()
x0, y0, w, h = self.getViewport()
dist = self.opts['distance']
fov = self.opts['fov']
nearClip = dist * 0.001
farClip = dist * 1000.
r = nearClip * np.tan(fov * 0.5 * np.pi / 180.)
t = r * h / w
# convert screen coordinates (region) to normalized device coordinates
# Xnd = (Xw - X0) * 2/width - 1
## Note that X0 and width in these equations must be the values used in viewport
@ -104,21 +107,46 @@ class GLViewWidget(QtOpenGL.QGLWidget):
right = r * ((region[0]+region[2]-x0) * (2.0/w) - 1)
bottom = t * ((region[1]-y0) * (2.0/h) - 1)
top = t * ((region[1]+region[3]-y0) * (2.0/h) - 1)
glFrustum( left, right, bottom, top, nearClip, farClip)
#glFrustum(-r, r, -t, t, nearClip, farClip)
tr = QtGui.QMatrix4x4()
tr.frustum(left, right, bottom, top, nearClip, farClip)
return tr
def setModelview(self):
glMatrixMode(GL_MODELVIEW)
glLoadIdentity()
glTranslatef( 0.0, 0.0, -self.opts['distance'])
glRotatef(self.opts['elevation']-90, 1, 0, 0)
glRotatef(self.opts['azimuth']+90, 0, 0, -1)
m = self.viewMatrix()
a = np.array(m.copyDataTo()).reshape((4,4))
glMultMatrixf(a.transpose())
def viewMatrix(self):
tr = QtGui.QMatrix4x4()
tr.translate( 0.0, 0.0, -self.opts['distance'])
tr.rotate(self.opts['elevation']-90, 1, 0, 0)
tr.rotate(self.opts['azimuth']+90, 0, 0, -1)
center = self.opts['center']
glTranslatef(-center.x(), -center.y(), -center.z())
tr.translate(-center.x(), -center.y(), -center.z())
return tr
def itemsAt(self, region=None):
#buf = np.zeros(100000, dtype=np.uint)
buf = glSelectBuffer(100000)
try:
glRenderMode(GL_SELECT)
glInitNames()
glPushName(0)
self._itemNames = {}
self.paintGL(region=region, useItemNames=True)
finally:
hits = glRenderMode(GL_RENDER)
items = [(h.near, h.names[0]) for h in hits]
items.sort(key=lambda i: i[0])
return [self._itemNames[i[1]] for i in items]
def paintGL(self, region=None, viewport=None):
def paintGL(self, region=None, viewport=None, useItemNames=False):
"""
viewport specifies the arguments to glViewport. If None, then we use self.opts['viewport']
region specifies the sub-region of self.opts['viewport'] that should be rendered.
@ -131,9 +159,9 @@ class GLViewWidget(QtOpenGL.QGLWidget):
self.setProjection(region=region)
self.setModelview()
glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT )
self.drawItemTree()
self.drawItemTree(useItemNames=useItemNames)
def drawItemTree(self, item=None):
def drawItemTree(self, item=None, useItemNames=False):
if item is None:
items = [x for x in self.items if x.parentItem() is None]
else:
@ -146,6 +174,9 @@ class GLViewWidget(QtOpenGL.QGLWidget):
if i is item:
try:
glPushAttrib(GL_ALL_ATTRIB_BITS)
if useItemNames:
glLoadName(id(i))
self._itemNames[id(i)] = i
i.paint()
except:
import pyqtgraph.debug
@ -168,7 +199,7 @@ class GLViewWidget(QtOpenGL.QGLWidget):
tr = i.transform()
a = np.array(tr.copyDataTo()).reshape((4,4))
glMultMatrixf(a.transpose())
self.drawItemTree(i)
self.drawItemTree(i, useItemNames=useItemNames)
finally:
glMatrixMode(GL_MODELVIEW)
glPopMatrix()