Node Editor Prototype
Last week while at Siggraph I attended a talk that mentioned ILM’s BlockParty. This is their internally developed modular rigging system. Modular rigging is an old idea, one I’ve been using for over a decade now, but the difference with BlockParty is how they chose to visualize the modules. They use a node layout similar to Maya’s Node Editor. Each node containing some visual queue as to what it is (usually an icon). This is a clever way to handle presenting and accessing a modular rigs data. Needless to say by the end of the talk I had a couple pages of notes outline how I could create my own version in Maya.
On my first Sunday back from Siggraph I spent a few hours throwing together a quick prototype. Below is a short video showing the UI in action followed by the entire source code. Please keep in mind this is a proof of concept. It is buggy and missing a lot of functionality.
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__author__ = 'abaker' """ @project: Pholidota @author: Austin Baker @created: 6/07/2015 @license: http://opensource.org/licenses/mit-license.php The MIT License (MIT) Copyright (c) 2015 Austin Baker Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. USAGE: """ ''' ============================================================ --- IMPORT MODULES ============================================================ ''' import PySide.QtGui as QtGui import PySide.QtCore as QtCore import maya.OpenMayaUI as OpenMayaUI from shiboken import wrapInstance ''' ============================================================ --- GRAPHICS CLASSES ============================================================ ''' class NodeLine(QtGui.QGraphicsPathItem): def __init__(self, pointA, pointB): super(NodeLine, self).__init__() self._pointA = pointA self._pointB = pointB self._source = None self._target = None self.setZValue(-1) self.setBrush(QtCore.Qt.NoBrush) self.pen = QtGui.QPen() self.pen.setStyle(QtCore.Qt.SolidLine) self.pen.setWidth(2) self.pen.setColor(QtGui.QColor(255,20,20,255)) self.setPen(self.pen) def mousePressEvent(self, event): self.pointB = event.pos() def mouseMoveEvent(self, event): self.pointB = event.pos() def updatePath(self): path = QtGui.QPainterPath() path.moveTo(self.pointA) dx = self.pointB.x() - self.pointA.x() dy = self.pointB.y() - self.pointA.y() ctrl1 = QtCore.QPointF(self.pointA.x() + dx * 0.25, self.pointA.y() + dy * 0.1) ctrl2 = QtCore.QPointF(self.pointA.x() + dx * 0.75, self.pointA.y() + dy * 0.9) path.cubicTo(ctrl1, ctrl2, self.pointB) self.setPath(path) def paint(self, painter, option, widget): painter.setPen(self.pen) painter.drawPath(self.path()) @property def pointA(self): return self._pointA @pointA.setter def pointA(self, point): self._pointA = point self.updatePath() @property def pointB(self): return self._pointB @pointB.setter def pointB(self, point): self._pointB = point self.updatePath() @property def source(self): return self._source @source.setter def source(self, widget): self._source = widget @property def target(self): return self._target @target.setter def target(self, widget): self._target = widget class NodeSocket(QtGui.QGraphicsItem): def __init__(self, rect, parent, socketType): super(NodeSocket, self).__init__(parent) self.rect = rect self.type = socketType # Brush. self.brush = QtGui.QBrush() self.brush.setStyle(QtCore.Qt.SolidPattern) self.brush.setColor(QtGui.QColor(180,20,90,255)) # Pen. self.pen = QtGui.QPen() self.pen.setStyle(QtCore.Qt.SolidLine) self.pen.setWidth(1) self.pen.setColor(QtGui.QColor(20,20,20,255)) # Lines. self.outLines = [] self.inLines = [] def shape(self): path = QtGui.QPainterPath() path.addEllipse(self.boundingRect()) return path def boundingRect(self): return QtCore.QRectF(self.rect) def paint(self, painter, option, widget): painter.setBrush(self.brush) painter.setPen(self.pen) painter.drawEllipse(self.rect) def mousePressEvent(self, event): if self.type == 'out': rect = self.boundingRect() pointA = QtCore.QPointF(rect.x() + rect.width()/2, rect.y() + rect.height()/2) pointA = self.mapToScene(pointA) pointB = self.mapToScene(event.pos()) self.newLine = NodeLine(pointA, pointB) self.outLines.append(self.newLine) self.scene().addItem(self.newLine) elif self.type == 'in': rect = self.boundingRect() pointA = self.mapToScene(event.pos()) pointB = QtCore.QPointF(rect.x() + rect.width()/2, rect.y() + rect.height()/2) pointB = self.mapToScene(pointB) self.newLine = NodeLine(pointA, pointB) self.inLines.append(self.newLine) self.scene().addItem(self.newLine) else: super(NodeSocket, self).mousePressEvent(event) def mouseMoveEvent(self, event): if self.type == 'out': pointB = self.mapToScene(event.pos()) self.newLine.pointB = pointB elif self.type == 'in': pointA = self.mapToScene(event.pos()) self.newLine.pointA = pointA else: super(NodeSocket, self).mouseMoveEvent(event) def mouseReleaseEvent(self, event): item = self.scene().itemAt(event.scenePos().toPoint()) if self.type == 'out' and item.type == 'in': self.newLine.source = self self.newLine.target = item item.parentItem().Input.inLines.append(self.newLine) self.newLine.pointB = item.getCenter() elif self.type == 'in' and item.type == 'out': self.newLine.source = item self.newLine.target = self item.parentItem().Output.outLines.append(self.newLine) self.newLine.pointA = item.getCenter() else: super(NodeSocket, self).mouseReleaseEvent(event) def getCenter(self): rect = self.boundingRect() center = QtCore.QPointF(rect.x() + rect.width()/2, rect.y() + rect.height()/2) center = self.mapToScene(center) return center class NodeItem(QtGui.QGraphicsItem): def __init__(self): super(NodeItem, self).__init__() self.name = None self.rect = QtCore.QRect(0,0,100,60) self.setFlag(QtGui.QGraphicsItem.ItemIsMovable) self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable) self.initUi() # Brush. self.brush = QtGui.QBrush() self.brush.setStyle(QtCore.Qt.SolidPattern) self.brush.setColor(QtGui.QColor(80,0,90,255)) # Pen. self.pen = QtGui.QPen() self.pen.setStyle(QtCore.Qt.SolidLine) self.pen.setWidth(1) self.pen.setColor(QtGui.QColor(20,20,20,255)) self.selPen = QtGui.QPen() self.selPen.setStyle(QtCore.Qt.SolidLine) self.selPen.setWidth(1) self.selPen.setColor(QtGui.QColor(0,255,255,255)) def initUi(self): self.Input = NodeSocket(QtCore.QRect(-10,20,20,20), self, 'in') self.Output = NodeSocket(QtCore.QRect(90,20,20,20), self, 'out') def shape(self): path = QtGui.QPainterPath() path.addRect(self.boundingRect()) return path def boundingRect(self): return QtCore.QRectF(self.rect) def paint(self, painter, option, widget): painter.setBrush(self.brush) if self.isSelected(): painter.setPen(self.selPen) else: painter.setPen(self.pen) painter.drawRect(self.rect) def mouseMoveEvent(self, event): super(NodeItem, self).mouseMoveEvent(event) for line in self.Output.outLines: line.pointA = line.source.getCenter() line.pointB = line.target.getCenter() for line in self.Input.inLines: line.pointA = line.source.getCenter() line.pointB = line.target.getCenter() def contextMenuEvent(self, event): menu = QtGui.QMenu() make = menu.addAction('make') makeFromHere = menu.addAction('make from here') debugConnections = menu.addAction('debug connections') selectedAction = menu.exec_(event.screenPos()) if selectedAction == debugConnections: print 'Input' for idx,line in enumerate(self.Input.inLines): print ' Line {0}'.format(idx) print ' pointA: {0}'.format(line.pointA) print ' pointB: {0}'.format(line.pointB) print 'Output' for idx,line in enumerate(self.Output.outLines): print ' Line {0}'.format(idx) print ' pointA: {0}'.format(line.pointA) print ' pointB: {0}'.format(line.pointB) class NodeView(QtGui.QGraphicsView): """ QGraphicsView for displaying the nodes. :param scene: QGraphicsScene. :param parent: QWidget. """ def __init__(self, scene, parent): super(NodeView, self).__init__(parent) self.setObjectName('View') self.setScene(scene) self.setTransformationAnchor(QtGui.QGraphicsView.AnchorUnderMouse) self.setViewportUpdateMode(QtGui.QGraphicsView.SmartViewportUpdate) self.drag = False def wheelEvent(self, event): """ Zooms the QGraphicsView in/out. :param event: QGraphicsSceneWheelEvent. """ inFactor = 1.25 outFactor = 1 / inFactor oldPos = self.mapToScene(event.pos()) if event.delta() > 0: zoomFactor = inFactor else: zoomFactor = outFactor self.scale(zoomFactor, zoomFactor) newPos = self.mapToScene(event.pos()) delta = newPos - oldPos self.translate(delta.x(), delta.y()) def mousePressEvent(self, event): if event.button() == QtCore.Qt.MiddleButton and event.modifiers() == QtCore.Qt.AltModifier: self.setDragMode(QtGui.QGraphicsView.NoDrag) self.drag = True self.prevPos = event.pos() self.setCursor(QtCore.Qt.SizeAllCursor) elif event.button() == QtCore.Qt.LeftButton: self.setDragMode(QtGui.QGraphicsView.RubberBandDrag) super(NodeView, self).mousePressEvent(event) def mouseMoveEvent(self, event): if self.drag: delta = (self.mapToScene(event.pos()) - self.mapToScene(self.prevPos)) * -1.0 center = QtCore.QPoint(self.viewport().width()/2 + delta.x(), self.viewport().height()/2 + delta.y()) newCenter = self.mapToScene(center) self.centerOn(newCenter) self.prevPos = event.pos() return super(NodeView, self).mouseMoveEvent(event) def mouseReleaseEvent(self, event): if self.drag: self.drag = False self.setCursor(QtCore.Qt.ArrowCursor) super(NodeView, self).mouseReleaseEvent(event) ''' ============================================================ --- UI CLASSES ============================================================ ''' class SideBar(QtGui.QFrame): def __init__(self, parent): super(SideBar, self).__init__(parent) self.setObjectName('SideBar') self.initUi() def initUi(self): # Frame. self.setFixedWidth(200) # Central Layout. self.CentralLayout = QtGui.QVBoxLayout(self) # Buttons. self.AddBoxButton = QtGui.QPushButton('Add Box') self.CentralLayout.addWidget(self.AddBoxButton) # Connections. self.initConnections() def initConnections(self): self.AddBoxButton.clicked.connect(self.clickedAddBoxButton) def clickedAddBoxButton(self): window = self.window() box = NodeItem() window.Scene.addItem(box) box.setPos(window.Scene.width()/2, window.Scene.height()/2) class NodeWindow(QtGui.QMainWindow): def __init__(self, parent): super(NodeWindow, self).__init__(parent) self.setWindowTitle('Node Window') self.initUi() def initUi(self): # Window. self.setMinimumSize(400,200) # Central Widget. self.CentralWidget = QtGui.QFrame() self.CentralWidget.setObjectName('CentralWidget') self.setCentralWidget(self.CentralWidget) # Central Layout. self.CentralLayout = QtGui.QHBoxLayout(self.CentralWidget) # GraphicsView. self.Scene = QtGui.QGraphicsScene() self.Scene.setObjectName('Scene') self.Scene.setSceneRect(0,0,32000,32000) self.View = NodeView(self.Scene, self) self.CentralLayout.addWidget(self.View) # Side Bar. self.SideBar = SideBar(self) self.CentralLayout.addWidget(self.SideBar) # Color. self.initColor() def initColor(self): windowCss = ''' QFrame { background-color: rgb(90,90,90); border: 1px solid rgb(90,70,30); } QFrame#SideBar { background-color: rgb(50,50,50); border: 1px solid rgb(255,255,255); }''' self.setStyleSheet(windowCss) ''' ============================================================ --- SHOW WINDOW ============================================================ ''' def mayaMainWindow(): """ Return the Maya main window widget as a Python object :return: Maya Main Window. """ mainWindowPtr = OpenMayaUI.MQtUtil.mainWindow() return wrapInstance(long(mainWindowPtr), QtGui.QWidget) if __name__ == '__main__': mayaWindow = mayaMainWindow() nodeWindow = NodeWindow(mayaWindow) nodeWindow.show() |
