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88
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1 from PyQt4.QtGui import *
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2 from PyQt4.QtCore import *
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3
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4 def enum(**enums):
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5 return type('Enum', (), enums)
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6
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7 Position = enum(TOP=0, TOP_RIGHT=1, RIGHT=2, BOTTOM_RIGHT=3, BOTTOM=4, BOTTOM_LEFT=5, LEFT=6, TOP_LEFT=7)
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8
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9 def buildPath(pts):
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10 path = QPainterPath(pts[0])
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11 for pt in pts[1:]: path.lineTo(pt)
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12 return path
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13
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14 def equalSpace(n, l, offset=15):
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15 if n == 1:
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16 return [l / 2]
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17 elif n > 1:
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18 return [offset + (l - offset*2)/(n - 1)*i for i in range(n)]
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19 return []
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20
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21 class Connection(QGraphicsPathItem):
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22 """ Implementation of a connection between blocks """
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23 def __init__(self, fromPort=None, toPort=None):
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24 super(Connection, self).__init__()
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25 self.pos2 = self.fromPort = self.toPort = None
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26 self.setFlags(self.ItemIsSelectable | self.ItemClipsToShape)
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27 pen = QPen(Qt.blue, 2, cap=Qt.RoundCap)
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28 self.setPen(pen)
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29 self.arrowhead = QGraphicsPathItem(self)
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30 self.arrowhead.setPath(buildPath([QPointF(0.0, 0.0), QPointF(-6.0, 10.0), QPointF(6.0, 10.0), QPointF(0.0, 0.0)]))
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31 self.arrowhead.setPen(pen)
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32 self.arrowhead.setBrush(QBrush(pen.color()))
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33 self.vias = []
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34 self.setFromPort(fromPort)
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35 self.setToPort(toPort)
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36 def getDict(self):
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37 d = {}
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38 d['fromBlock'] = self.fromPort.block.name
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39 d['fromPort'] = self.fromPort.name
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40 d['toBlock'] = self.toPort.block.name
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41 d['toPort'] = self.toPort.name
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42 return d
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43 Dict = property(getDict)
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44 def myDelete(self):
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45 scene = self.scene()
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46 if scene:
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47 self.setFromPort(None)
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48 self.setToPort(None)
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49 scene.removeItem(self)
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50 def setFromPort(self, fromPort):
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51 if self.fromPort:
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52 self.fromPort.posCallbacks.remove(self.setBeginPos)
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53 self.fromPort.connection = None
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54 self.fromPort = fromPort
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55 if self.fromPort:
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56 self.fromPort.connection = self
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57 self.updateLineStukken()
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58 self.fromPort.posCallbacks.append(self.setBeginPos)
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59 def setToPort(self, toPort):
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60 if self.toPort:
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61 self.toPort.posCallbacks.remove(self.setEndPos)
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62 self.toPort.connection = None
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63 self.toPort = toPort
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64 if self.toPort:
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65 self.setEndPos(toPort.scenePos())
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66 self.toPort.connection = self
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67 self.toPort.posCallbacks.append(self.setEndPos)
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68 def getPos1(self):
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69 if self.fromPort:
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70 return self.fromPort.scenePos()
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71 def setBeginPos(self, pos1): self.updateLineStukken()
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72 def setEndPos(self, endpos):
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73 self.pos2 = endpos
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74 self.updateLineStukken()
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75 def itemChange(self, change, value):
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76 if change == self.ItemSelectedHasChanged:
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77 for via in self.vias:
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78 via.setVisible(value)
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79 return super(Connection, self).itemChange(change, value)
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80 def shape(self): return self.myshape
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81 def updateLineStukken(self):
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82 """
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83 This algorithm determines the optimal routing of all signals.
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84 TODO: implement nice automatic line router
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85 """
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86 pos1 = self.getPos1()
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87 pos2 = self.pos2
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88 if pos1 is None or pos2 is None:
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89 return
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90 scene = self.scene()
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91 vias = [pos1 + QPointF(20, 0)] + self.vias + [pos2 + QPointF(-20, 0)]
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92 if scene:
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93 litem = QGraphicsLineItem()
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94 litem.setFlags(self.ItemIsSelectable)
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95 scene.addItem(litem)
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96 for p1, p2 in zip(vias[:-1], vias[1:]):
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97 line = QLineF(p1, p2)
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98 litem.setLine(line)
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99 citems = scene.collidingItems(litem)
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100 citems = [i for i in citems if type(i) is BlockItem]
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101 scene.removeItem(litem)
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102 pts = [pos1] + vias + [pos2]
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103 self.arrowhead.setPos(pos2)
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104 self.arrowhead.setRotation(90)
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105 p = buildPath(pts)
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106 pps = QPainterPathStroker()
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107 pps.setWidth(3)
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108 p = pps.createStroke(p).simplified()
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109 self.setPath(p)
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110 """ Create a shape outline using the path stroker """
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111 s = super(Connection, self).shape()
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112 pps = QPainterPathStroker()
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113 pps.setWidth(10)
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114 self.myshape = pps.createStroke(s).simplified()
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115
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116 class PortItem(QGraphicsPathItem):
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117 """ Represents a port to a subsystem """
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118 def __init__(self, name, block):
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119 super(PortItem, self).__init__(block)
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120 self.textItem = QGraphicsTextItem(self)
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121 self.connection = None
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122 self.block = block
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123 self.setCursor(QCursor(Qt.CrossCursor))
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124 self.setPen(QPen(Qt.blue, 2, cap=Qt.RoundCap))
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125 self.name = name
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126 self.posCallbacks = []
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127 self.setFlag(self.ItemSendsScenePositionChanges, True)
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128 def getName(self): return self.textItem.toPlainText()
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129 def setName(self, name):
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130 self.textItem.setPlainText(name)
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131 rect = self.textItem.boundingRect()
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132 lw, lh = rect.width(), rect.height()
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133 lx = 3 if type(self) is InputPort else -3 - lw
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134 self.textItem.setPos(lx, -lh / 2)
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135 name = property(getName, setName)
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136 def getDict(self): return {'name': self.name}
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137 Dict = property(getDict)
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138 def itemChange(self, change, value):
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139 if change == self.ItemScenePositionHasChanged:
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140 for cb in self.posCallbacks: cb(value)
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141 return value
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142 return super(PortItem, self).itemChange(change, value)
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143
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144 class OutputPort(PortItem):
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145 def __init__(self, name, block, d=10.0):
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146 super(OutputPort, self).__init__(name, block)
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147 self.setPath(buildPath([QPointF(0.0, -d), QPointF(d, 0), QPointF(0.0, d)]))
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148 def mousePressEvent(self, event):
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149 self.scene().startConnection(self)
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150
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151 class InputPort(PortItem):
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152 def __init__(self, name, block, d=10.0):
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153 super(InputPort, self).__init__(name, block)
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154 self.setPath(buildPath([QPointF(-d, -d), QPointF(0, 0), QPointF(-d, d)]))
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155
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156 class Handle(QGraphicsEllipseItem):
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157 """ A handle that can be moved by the mouse """
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158 def __init__(self, parent=None):
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159 dx = 13.0
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160 super(Handle, self).__init__(QRectF(-0.5*dx,-0.5*dx,dx,dx), parent)
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161 self.posChangeCallbacks = []
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162 self.setBrush(QBrush(Qt.white))
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163 self.setFlags(self.ItemSendsScenePositionChanges | self.ItemIsMovable)
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164 self.setVisible(False)
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165 self.setCursor(QCursor(Qt.SizeFDiagCursor))
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166 def mouseMoveEvent(self, event):
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167 """ Move function without moving the other selected elements """
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168 p = self.mapToParent(event.pos())
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169 self.setPos(p)
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170 def itemChange(self, change, value):
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171 if change == self.ItemPositionChange:
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172 for cb in self.posChangeCallbacks:
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173 res = cb(value)
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174 if res: value = res
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175 return value
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176 return super(Handle, self).itemChange(change, value)
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177
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178 class ResizeSelectionHandle(Handle):
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179 def __init__(self, position):
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180 super(ResizeSelectionHandle, self).__init__()
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181 self.position = position
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182 if position in [Position.TOP_LEFT, Position.BOTTOM_RIGHT]:
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183 self.setCursor(QCursor(Qt.SizeFDiagCursor))
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184 elif position in [Position.TOP_RIGHT, Position.BOTTOM_LEFT]:
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185 self.setCursor(QCursor(Qt.SizeBDiagCursor))
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186 elif position in [Position.TOP, Position.BOTTOM]:
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187 self.setCursor(QCursor(Qt.SizeVerCursor))
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188 elif position in [Position.LEFT, Position.RIGHT]:
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189 self.setCursor(QCursor(Qt.SizeHorCursor))
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190 def mouseMoveEvent(self, event):
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191 self.scene().sizerMoveEvent(self, event.scenePos())
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192
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193
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194 class BlockItem(QGraphicsRectItem):
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195 """ Represents a block in the diagram """
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196 def __init__(self, name='Untitled', parent=None):
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197 super(BlockItem, self).__init__(parent)
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198 self.subModel = DiagramScene()
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199 self.subModel.containingBlock = self
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200 # Properties of the rectangle:
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201 self.setPen(QPen(Qt.blue, 2))
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202 self.setBrush(QBrush(Qt.lightGray))
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203 self.setFlags(self.ItemIsSelectable | self.ItemIsMovable | self.ItemSendsScenePositionChanges)
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204 self.setCursor(QCursor(Qt.PointingHandCursor))
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205 self.label = QGraphicsTextItem(name, self)
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206 self.name = name
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207 self.code = ''
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208 # Create corner for resize:
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209 button = QPushButton('+in')
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210 button.clicked.connect(self.newInputPort)
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211 self.buttonItemAddInput = QGraphicsProxyWidget(self)
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212 self.buttonItemAddInput.setWidget(button)
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213 self.buttonItemAddInput.setVisible(False)
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214 button = QPushButton('+out')
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215 button.clicked.connect(self.newOutputPort)
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216 self.buttonItemAddOutput = QGraphicsProxyWidget(self)
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217 self.buttonItemAddOutput.setWidget(button)
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218 self.buttonItemAddOutput.setVisible(False)
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219 # Inputs and outputs of the block:
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220 self.inputs = []
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221 self.outputs = []
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222 def editParameters(self):
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223 pd = ParameterDialog(self, self.window())
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224 pd.exec_()
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225 def mouseDoubleClickEvent(self, event):
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226 #self.editParameters()
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227 scene = self.scene()
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228 if scene:
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229 for view in scene.views():
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230 view.diagram = self.subModel
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231 view.zoomAll()
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232 def newInputPort(self):
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233 names = [i.name for i in self.inputs + self.outputs]
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234 self.addInput(InputPort(uniqify('in', names), self))
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235 def newOutputPort(self):
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236 names = [i.name for i in self.inputs + self.outputs]
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237 self.addOutput(OutputPort(uniqify('out', names), self))
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238 def setName(self, name): self.label.setPlainText(name)
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239 def getName(self): return self.label.toPlainText()
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240 name = property(getName, setName)
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241 def getDict(self):
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242 d = {'x': self.scenePos().x(), 'y': self.scenePos().y()}
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243 rect = self.rect()
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244 d.update({'width': rect.width(), 'height': rect.height()})
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245 d.update({'name': self.name, 'code': self.code})
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246 d['inputs'] = [inp.Dict for inp in self.inputs]
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247 d['outputs'] = [outp.Dict for outp in self.outputs]
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248 d['submodel'] = self.subModel.Dict
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249 return d
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250 def setDict(self, d):
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251 self.name = d['name']
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252 self.code = d['code']
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253 self.setPos(d['x'], d['y'])
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254 self.changeSize(d['width'], d['height'])
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255 for inp in d['inputs']: self.addInput(InputPort(inp['name'], self))
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256 for outp in d['outputs']: self.addOutput(OutputPort(outp['name'], self))
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257 self.subModel.Dict = d['submodel']
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258 Dict = property(getDict, setDict)
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259 def gencode(self):
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260 c = ['def {0}():'.format(self.name)]
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261 if self.code:
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262 c += indent(self.code.split('\n'))
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263 else:
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264 c += indent(['pass'])
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265 return c
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266 def addInput(self, i):
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267 self.inputs.append(i)
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268 self.updateSize()
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269 def addOutput(self, o):
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270 self.outputs.append(o)
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271 self.updateSize()
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272 def contextMenuEvent(self, event):
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273 menu = QMenu()
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274 pa = menu.addAction('Parameters')
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275 pa.triggered.connect(self.editParameters)
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276 menu.exec_(event.screenPos())
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277 def itemChange(self, change, value):
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278 if change == self.ItemSelectedHasChanged:
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279 for child in [self.buttonItemAddInput, self.buttonItemAddOutput]:
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280 child.setVisible(value)
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281 return super(BlockItem, self).itemChange(change, value)
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282 def myDelete(self):
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283 for p in self.inputs + self.outputs:
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284 if p.connection: p.connection.myDelete()
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285 self.scene().removeItem(self)
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286 def updateSize(self):
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287 rect = self.rect()
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288 h, w = rect.height(), rect.width()
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289 self.buttonItemAddInput.setPos(0, h + 4)
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290 self.buttonItemAddOutput.setPos(w+10, h+4)
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291 for inp, y in zip(self.inputs, equalSpace(len(self.inputs), h)):
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292 inp.setPos(0.0, y)
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293 for outp, y in zip(self.outputs, equalSpace(len(self.outputs), h)):
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294 outp.setPos(w, y)
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295 def setCenterAndSize(self, center, size):
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296 self.changeSize(size.width(), size.height())
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297 p = QPointF(size.width(), size.height())
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298 self.setPos(center - p / 2)
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299 def changeSize(self, w, h):
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300 h = 20 if h < 20 else h
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301 w = 40 if w < 40 else w
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302 self.setRect(0.0, 0.0, w, h)
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303 rect = self.label.boundingRect()
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304 self.label.setPos((w - rect.width()) / 2, (h - rect.height()) / 2)
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305 self.updateSize()
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306
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307
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308 class DiagramScene(QGraphicsScene):
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309 def __init__(self):
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310 super(DiagramScene, self).__init__()
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311 self.startedConnection = None
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312 self.selectionHandles = [ResizeSelectionHandle(i) for i in range(8)]
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313 for h in self.selectionHandles:
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314 self.addItem(h)
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315 h.setVisible(False)
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316 self.selectionChanged.connect(self.handleSelectionChanged)
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317 def repositionAndShowHandles(self):
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318 r = self.selectionRect
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319 self.selectionHandles[Position.TOP_LEFT].setPos(r.topLeft())
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320 self.selectionHandles[Position.TOP].setPos(r.center().x(), r.top())
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321 self.selectionHandles[Position.TOP_RIGHT].setPos(r.topRight())
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322 self.selectionHandles[Position.RIGHT].setPos(r.right(), r.center().y())
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323 self.selectionHandles[Position.BOTTOM_RIGHT].setPos(r.bottomRight())
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324 self.selectionHandles[Position.BOTTOM].setPos(r.center().x(), r.bottom())
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325 self.selectionHandles[Position.BOTTOM_LEFT].setPos(r.bottomLeft())
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326 self.selectionHandles[Position.LEFT].setPos(r.left(), r.center().y())
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327 for h in self.selectionHandles:
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328 h.setVisible(True)
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329 def handleSelectionChanged(self):
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330 [h.setVisible(False) for h in self.selectionHandles]
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331 items = self.selectedItems()
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332 items = [i for i in items if type(i) is BlockItem]
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333 if items:
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334 r = QRectF()
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335 for i in items:
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336 r = r.united(i.boundingRect().translated(i.scenePos()))
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337 self.selectionRect = r
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338 self.repositionAndShowHandles()
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339 def sizerMoveEvent(self, handle, pos):
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340 if handle.position == Position.TOP_LEFT: self.selectionRect.setTopLeft(pos)
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341 elif handle.position == Position.TOP: self.selectionRect.setTop(pos.y())
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342 elif handle.position == Position.TOP_RIGHT: self.selectionRect.setTopRight(pos)
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343 elif handle.position == Position.RIGHT: self.selectionRect.setRight(pos.x())
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344 elif handle.position == Position.BOTTOM_RIGHT: self.selectionRect.setBottomRight(pos)
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345 elif handle.position == Position.BOTTOM: self.selectionRect.setBottom(pos.y())
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346 elif handle.position == Position.BOTTOM_LEFT: self.selectionRect.setBottomLeft(pos)
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347 elif handle.position == Position.LEFT: self.selectionRect.setLeft(pos.x())
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348 else:
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349 print('invalid position')
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350 self.repositionAndShowHandles()
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351 items = self.selectedItems()
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352 items = [i for i in items if type(i) is BlockItem]
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353 if items:
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354 item = items[0]
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355 # TODO resize more items!
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356 item.setCenterAndSize(self.selectionRect.center(), self.selectionRect.size())
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357
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358 blocks = property(lambda sel: [i for i in sel.items() if type(i) is BlockItem])
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359 connections = property(lambda sel: [i for i in sel.items() if type(i) is Connection])
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360 def setDict(self, d):
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361 for block in d['blocks']:
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362 b = BlockItem()
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363 self.addItem(b)
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364 b.Dict = block
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365 for con in d['connections']:
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366 fromPort = self.findPort(con['fromBlock'], con['fromPort'])
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367 toPort = self.findPort(con['toBlock'], con['toPort'])
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368 self.addItem(Connection(fromPort, toPort))
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369 def getDict(self):
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370 return {'blocks': [b.Dict for b in self.blocks], 'connections': [c.Dict for c in self.connections]}
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371 Dict = property(getDict, setDict)
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372 def gencode(self):
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373 c = []
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374 for b in self.blocks:
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375 c += b.gencode()
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376 for b in self.blocks:
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377 c.append('{0}()'.format(b.name))
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378 return c
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379 def findPort(self, blockname, portname):
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380 block = self.findBlock(blockname)
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381 if block:
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382 for port in block.inputs + block.outputs:
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383 if port.name == portname: return port
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384 def findBlock(self, blockname):
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385 for block in self.blocks:
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386 if block.name == blockname: return block
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387 def addNewBlock(self, pos, name):
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388 blocknames = [item.name for item in self.blocks]
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389 b1 = BlockItem(uniqify(name, blocknames))
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390 b1.setPos(pos)
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391 self.addItem(b1)
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392 def mouseMoveEvent(self, event):
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393 if self.startedConnection:
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394 pos = event.scenePos()
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395 self.startedConnection.setEndPos(pos)
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396 super(DiagramScene, self).mouseMoveEvent(event)
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397 def mouseReleaseEvent(self, event):
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398 if self.startedConnection:
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399 for item in self.items(event.scenePos()):
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400 if type(item) is InputPort and item.connection == None:
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401 self.startedConnection.setToPort(item)
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402 self.startedConnection = None
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403 return
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404 self.startedConnection.myDelete()
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405 self.startedConnection = None
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406 super(DiagramScene, self).mouseReleaseEvent(event)
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407 def startConnection(self, port):
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408 self.startedConnection = Connection(port, None)
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409 pos = port.scenePos()
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410 self.startedConnection.setEndPos(pos)
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411 self.addItem(self.startedConnection)
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412 def deleteItems(self):
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413 for item in list(self.selectedItems()): item.myDelete()
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