Macro View Rotation

This GUI allows the view to be rotated with more precision than when using the mouse. Rotation is according to axes fixed with respect to the user and not the objects, though the aim is that the objects rotate about their approximate shared centre rather than the view centre.

The GUI defaults to the top right of the screen, this behaviour can be changed by editing

a = QtGui.QDesktopWidget right = a.availableGeometry.width self.setGeometry(right-300, 0, 300, 150)

at the end of the function 'initUI'. The first two arguments (right-300, 0) provide the position for the top left corner of the window - my experience is that the behaviour was as intended on Ubuntu but Vista positioned the window too high and the 0 needed to be changed to ~30.

Three icons are referred to to symbolise the rotation directions. A zip file containing these icons can be found here, the images should be placed in the folder containing your macros. Please feel free to contribute better ones!

from PyQt4 import QtGui, QtCore from pivy import coin from math import pi def find_centre: xmax = xmin = ymax = ymin = zmax = zmin = 0 for obj in App.ActiveDocument.Objects: if obj.Type[:4] == "Mesh": box = obj.Mesh.BoundBox elif obj.Type[:6] == "Points": box = obj.Points.BoundBox elif obj.Type[:4] == "Part": box = obj.Shape.BoundBox else: continue xmax = max(xmax, box.XMax) xmin = min(xmin, box.XMin) ymax = max(ymax, box.YMax) ymin = min(ymin, box.YMin) zmax = max(zmax, box.ZMax) zmin = min(zmin, box.ZMin) centre = FreeCAD.Vector((xmax+xmin)/2.0, (ymax+ymin)/2.0, (zmax+zmin)/2.0) return centre class rotate_gui(QtGui.QWidget): def __init__(self): super(rotate_gui, self).__init__ self.initUI self.initRotate def initUI(self): self.sld = [0,1,2] self.tbox = [0,1,2] path = FreeCAD.ConfigGet("UserAppData") icon = [0,1,2] icons = ('right.png', 'up.png', 'out.png') for i in range(3): self.sld[i] = QtGui.QSlider(QtCore.Qt.Horizontal, self) self.sld[i].setFocusPolicy(QtCore.Qt.NoFocus) self.sld[i].setSingleStep(5) self.sld[i].setPageStep(15) self.sld[i].setValue(0) self.sld[i].setMaximum(180) self.sld[i].setMinimum(-180) self.tbox[i] = QtGui.QLineEdit(self) self.tbox[i].setText("0") self.tbox[i].setAlignment(QtCore.Qt.AlignRight) icon[i] = QtGui.QLabel(self) icon[i].setPixmap(QtGui.QPixmap(path + icons[i])) self.sld[i].valueChanged[int].connect(self.valueChange) self.tbox[i].returnPressed.connect(self.valueEntered) resetButton = QtGui.QPushButton("Reset") resetButton.clicked.connect(self.reset) okButton = QtGui.QPushButton("OK") okButton.clicked.connect(self.close) cancelButton = QtGui.QPushButton("Cancel") cancelButton.clicked.connect(self.cancel) hbox = [0,1,2,3] vbox = QtGui.QVBoxLayout for i in range(3): hbox[i] = QtGui.QHBoxLayout hbox[i].addWidget(icon[i],1, QtCore.Qt.AlignCenter) hbox[i].addWidget(self.sld[i],4) hbox[i].addWidget(self.tbox[i],1) vbox.addLayout(hbox[i]) hbox[3] = QtGui.QHBoxLayout hbox[3].addWidget(resetButton,1) hbox[3].addWidget(okButton,1) hbox[3].addWidget(cancelButton,1) vbox.addStretch(1) vbox.addLayout(hbox[3]) self.setLayout(vbox) a = QtGui.QDesktopWidget right = a.availableGeometry.width self.setGeometry(right-300, 0, 300, 150) self.setWindowTitle('Rotate view...') self.show def initRotate(self): self.internal = False self.current = 0 self.cam = Gui.ActiveDocument.ActiveView.getCameraNode self.centre = coin.SbVec3f(find_centre) self.view = self.cam.orientation.getValue self.pos = self.cam.position.getValue #store a copy of the original view to be restored in the case of user selecting Reset or Cancel self.original_view = coin.SbRotation(self.view.getValue) self.original_pos = coin.SbVec3f(self.pos.getValue) self.config_direction(0) def reset(self): #reset the view to the original one self.cam.orientation = self.original_view self.cam.position = self.original_pos for sld in self.sld: sld.setValue(0) for tbox in self.tbox: tbox.setText("0") def cancel(self): self.reset self.close def config_direction(self, i): #evaluate the vectors corresponding to the three directions for the current view, and assign the i-th one to self.direction self.view = self.cam.orientation.getValue self.view = coin.SbRotation(self.view.getValue) self.pos = self.cam.position.getValue self.pos = coin.SbVec3f(self.pos.getValue) up = coin.SbVec3f(0,1,0) self.up = self.view.multVec(up) out = coin.SbVec3f(0,0,1) self.out = self.view.multVec(out) u = self.up.getValue o = self.out.getValue r = (u[1]*o[2]-u[2]*o[1], u[2]*o[0]-u[0]*o[2], u[0]*o[1]-u[1]*o[0]) self.right = coin.SbVec3f(r) self.direction = [self.right, self.up, self.out][i] def check(self, i): #check if the direction of rotation has changed, if so then set previous slider & textbox to zero, and setup the new direction if i <> self.current: self.internal = True self.sld[self.current].setValue(0) self.tbox[self.current].setText("0") self.internal = False self.current = i 			self.config_direction(i) def rotate(self, value): #carry out the desired rotation about self.direction val = value*pi/180.0 rot = coin.SbRotation(self.direction, -val) nrot = self.view*rot prot = rot.multVec(self.pos - self.centre) + self.centre self.cam.orientation = nrot self.cam.position = prot def valueChange(self, value): #respond to the change in value of a slider, update the corresponding text box, check for a direction change then rotate #if the value was changed internally, ignore event. if self.internal: return sender = self.sender for i in range(3): if sender == self.sld[i]: break self.tbox[i].setText(str(value)) self.check(i) self.rotate(value) def valueEntered(self): #respond to a value being entered in a text box, updating the corresponding slider, check for direction change then rotate sender = self.sender for i in range(3): if sender == self.tbox[i]: break value = int(self.tbox[i].text) self.internal = True self.sld[i].setValue(value) self.internal = False self.check(i) self.rotate(value) rotate = rotate_gui