问题描述
默认情况下，pyqtgraph的鼠标交互在[鼠标滚轮+拖动]上具有平移事件，如何在[鼠标右键+拖动]上设置这种平移事件？
似乎应该是mousepressEvent和mouseMoveEvent的某种组合
或只是eventFilter(self,source,event)
我的pyqtgraph openGLWidget放置在PyQt5表单上，因此看起来此类事件应该从openGLWidget类内部继承QMainWindow。
但是我不确定如何制作这样的事件过滤器。
一些伪代码的初步想法：
class MainWindow(QMainWindow):
def __init__(self):
QMainWindow.__init__(self)
uic.loadUi(_UI,self)
axis = gl.GLAxisItem()
self.openGLWidget.addItem(axis)
...
...
def eventFilter(self,event):
if (event.type() == QtCore.QEvent.KeyPress):
...
...
return super(openGLWidget,self).eventFilter(source,event)
解决方法
可能是这样的：
class MainWindow(QMainWindow):
def __init__(self):
QMainWindow.__init__(self)
uic.loadUi(_UI,self) # Load the .ui file
axis = gl.GLAxisItem()
grid = gl.GLGridItem()
grid.scale(100,100,100)
self.openGLWidget.addItem(grid)
self.openGLWidget.addItem(axis)
# installEventFilter
self.openGLWidget.installEventFilter(self)
def eventFilter(self,source,event):
if event.type() == QtCore.QEvent.MouseMove:
if event.buttons() == QtCore.Qt.NoButton:
print("Simple mouse motion")
pass
elif event.buttons() == QtCore.Qt.LeftButton:
# print("Left click drag")
pass
elif event.buttons() == QtCore.Qt.RightButton:
coef = 20 # Responsiveness of the pan
xx = ((self.openGLWidget.size().width())/2)/coef
yy = ((self.openGLWidget.size().height())/2)/coef
self.pan((event.x()/coef)-xx,(event.y()/coef)-yy,0)
self.openGLWidget.updateGL()
# print("Right click drag")
elif event.type() == QtCore.QEvent.MouseButtonPress:
if event.button() == QtCore.Qt.RightButton:
pass
# print("Press!")
return super(MainWindow,self).eventFilter(source,event)
def pan(self,dx,dy,dz,relative='view'):
"""
Moves the center (look-at) position while holding the camera in place.
============== =======================================================
*relative* String that determines the direction of dx,dz.
If "global",then the global coordinate system is used.
If "view",then the z axis is aligned with the view
If "view-upright",then x is in the global xy plane and
points to the right side of the view,y is in the
global xy plane and orthogonal to x,and z points in
the global z direction.
"""
# for backward compatibility:
relative = {True: "view-upright",False: "global"}.get(relative,relative)
if relative == 'global':
self.openGLWidget.opts['center'] += QtGui.QVector3D(dx,dz)
elif relative == 'view-upright':
cPos = self.openGLWidget.cameraPosition()
cVec = self.openGLWidget.opts['center'] - cPos
dist = cVec.length() ## distance from camera to center
xDist = dist * 2. * np.tan(0.5 * self.openGLWidget.opts['fov'] * np.pi / 180.) ## approx. width of view at distance of center point
xScale = xDist / self.width()
zVec = QtGui.QVector3D(0,1)
xVec = QtGui.QVector3D.crossProduct(zVec,cVec).normalized()
yVec = QtGui.QVector3D.crossProduct(xVec,zVec).normalized()
self.openGLWidget.opts['center'] = self.openGLWidget.opts['center'] + xVec * xScale * dx + yVec * xScale * dy + zVec * xScale * dz
elif relative == 'view':
# pan in plane of camera
elev = np.radians(self.openGLWidget.opts['elevation'])
azim = np.radians(self.openGLWidget.opts['azimuth'])
fov = np.radians(self.openGLWidget.opts['fov'])
dist = (self.openGLWidget.opts['center'] - self.openGLWidget.cameraPosition()).length()
fov_factor = np.tan(fov / 2) * 2
scale_factor = dist * fov_factor / self.width()
z = scale_factor * np.cos(elev) * dy
x = scale_factor * (np.sin(azim) * dx - np.sin(elev) * np.cos(azim) * dy)
y = scale_factor * (np.cos(azim) * dx + np.sin(elev) * np.sin(azim) * dy)
self.openGLWidget.opts['center'] += QtGui.QVector3D(x,-y,z)
else:
raise ValueError("relative argument must be global,view,or view-upright")
self.update()