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92
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1 """
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2 Contains all blocks that can be used to build models.
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3 """
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4
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88
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5 from PyQt4.QtGui import *
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6 from PyQt4.QtCore import *
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7
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91
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8 def uniqify(name, names):
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9 newname, i = name, 1
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10 while newname in names: newname, i = name + str(i), i + 1
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11 return newname
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12
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88
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13 def enum(**enums):
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14 return type('Enum', (), enums)
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15
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16 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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17
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18 def buildPath(pts):
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19 path = QPainterPath(pts[0])
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20 for pt in pts[1:]: path.lineTo(pt)
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21 return path
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22
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23 def equalSpace(n, l, offset=15):
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24 if n == 1:
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25 return [l / 2]
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26 elif n > 1:
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27 return [offset + (l - offset*2)/(n - 1)*i for i in range(n)]
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28 return []
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29
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30 class Connection(QGraphicsPathItem):
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92
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31 """ A connection between blocks """
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88
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32 def __init__(self, fromPort=None, toPort=None):
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33 super(Connection, self).__init__()
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34 self.pos2 = self.fromPort = self.toPort = None
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35 self.setFlags(self.ItemIsSelectable | self.ItemClipsToShape)
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36 pen = QPen(Qt.blue, 2, cap=Qt.RoundCap)
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37 self.setPen(pen)
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38 self.arrowhead = QGraphicsPathItem(self)
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39 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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40 self.arrowhead.setPen(pen)
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41 self.arrowhead.setBrush(QBrush(pen.color()))
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42 self.vias = []
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43 self.setFromPort(fromPort)
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44 self.setToPort(toPort)
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45 def getDict(self):
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46 d = {}
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47 d['fromBlock'] = self.fromPort.block.name
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48 d['fromPort'] = self.fromPort.name
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49 d['toBlock'] = self.toPort.block.name
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50 d['toPort'] = self.toPort.name
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51 return d
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52 Dict = property(getDict)
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53 def myDelete(self):
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54 scene = self.scene()
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55 if scene:
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56 self.setFromPort(None)
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57 self.setToPort(None)
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58 scene.removeItem(self)
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59 def setFromPort(self, fromPort):
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60 if self.fromPort:
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61 self.fromPort.posCallbacks.remove(self.setBeginPos)
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62 self.fromPort.connection = None
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63 self.fromPort = fromPort
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64 if self.fromPort:
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65 self.fromPort.connection = self
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66 self.updateLineStukken()
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67 self.fromPort.posCallbacks.append(self.setBeginPos)
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68 def setToPort(self, toPort):
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69 if self.toPort:
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70 self.toPort.posCallbacks.remove(self.setEndPos)
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71 self.toPort.connection = None
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72 self.toPort = toPort
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73 if self.toPort:
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74 self.setEndPos(toPort.scenePos())
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75 self.toPort.connection = self
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76 self.toPort.posCallbacks.append(self.setEndPos)
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77 def getPos1(self):
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78 if self.fromPort:
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79 return self.fromPort.scenePos()
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80 def setBeginPos(self, pos1): self.updateLineStukken()
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81 def setEndPos(self, endpos):
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82 self.pos2 = endpos
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83 self.updateLineStukken()
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84 def itemChange(self, change, value):
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85 if change == self.ItemSelectedHasChanged:
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86 for via in self.vias:
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87 via.setVisible(value)
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88 return super(Connection, self).itemChange(change, value)
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89 def shape(self): return self.myshape
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90 def updateLineStukken(self):
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91 """
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92 This algorithm determines the optimal routing of all signals.
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93 TODO: implement nice automatic line router
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94 """
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95 pos1 = self.getPos1()
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96 pos2 = self.pos2
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97 if pos1 is None or pos2 is None:
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98 return
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99 scene = self.scene()
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100 vias = [pos1 + QPointF(20, 0)] + self.vias + [pos2 + QPointF(-20, 0)]
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101 if scene:
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102 litem = QGraphicsLineItem()
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103 litem.setFlags(self.ItemIsSelectable)
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104 scene.addItem(litem)
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105 for p1, p2 in zip(vias[:-1], vias[1:]):
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106 line = QLineF(p1, p2)
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107 litem.setLine(line)
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108 citems = scene.collidingItems(litem)
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89
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109 citems = [i for i in citems if type(i) is Block]
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88
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110 scene.removeItem(litem)
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111 pts = [pos1] + vias + [pos2]
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112 self.arrowhead.setPos(pos2)
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113 self.arrowhead.setRotation(90)
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114 p = buildPath(pts)
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115 self.setPath(p)
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116 """ Create a shape outline using the path stroker """
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117 s = super(Connection, self).shape()
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118 pps = QPainterPathStroker()
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119 pps.setWidth(10)
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120 self.myshape = pps.createStroke(s).simplified()
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121
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122 class PortItem(QGraphicsPathItem):
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123 """ Represents a port to a subsystem """
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124 def __init__(self, name, block):
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125 super(PortItem, self).__init__(block)
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126 self.textItem = QGraphicsTextItem(self)
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127 self.connection = None
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128 self.block = block
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129 self.setCursor(QCursor(Qt.CrossCursor))
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130 self.setPen(QPen(Qt.blue, 2, cap=Qt.RoundCap))
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131 self.name = name
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132 self.posCallbacks = []
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133 self.setFlag(self.ItemSendsScenePositionChanges, True)
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134 def getName(self): return self.textItem.toPlainText()
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135 def setName(self, name):
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136 self.textItem.setPlainText(name)
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137 rect = self.textItem.boundingRect()
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138 lw, lh = rect.width(), rect.height()
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139 lx = 3 if type(self) is InputPort else -3 - lw
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140 self.textItem.setPos(lx, -lh / 2)
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141 name = property(getName, setName)
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91
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142 def getDict(self):
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143 return {'name': self.name}
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88
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144 Dict = property(getDict)
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145 def itemChange(self, change, value):
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146 if change == self.ItemScenePositionHasChanged:
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147 for cb in self.posCallbacks: cb(value)
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148 return value
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149 return super(PortItem, self).itemChange(change, value)
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150
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151 class OutputPort(PortItem):
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152 def __init__(self, name, block, d=10.0):
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153 super(OutputPort, self).__init__(name, block)
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154 self.setPath(buildPath([QPointF(0.0, -d), QPointF(d, 0), QPointF(0.0, d)]))
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155 def mousePressEvent(self, event):
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156 self.scene().startConnection(self)
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157
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158 class InputPort(PortItem):
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159 def __init__(self, name, block, d=10.0):
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160 super(InputPort, self).__init__(name, block)
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161 self.setPath(buildPath([QPointF(-d, -d), QPointF(0, 0), QPointF(-d, d)]))
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162
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163 class Handle(QGraphicsEllipseItem):
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164 """ A handle that can be moved by the mouse """
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89
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165 def __init__(self, dx=10.0, parent=None):
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88
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166 super(Handle, self).__init__(QRectF(-0.5*dx,-0.5*dx,dx,dx), parent)
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167 self.setBrush(QBrush(Qt.white))
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90
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168 self.setFlags(self.ItemIsMovable)
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169 self.setZValue(1)
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88
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170 self.setVisible(False)
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171 self.setCursor(QCursor(Qt.SizeFDiagCursor))
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172 def mouseMoveEvent(self, event):
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173 """ Move function without moving the other selected elements """
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174 p = self.mapToParent(event.pos())
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175 self.setPos(p)
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176
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177 class ResizeSelectionHandle(Handle):
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90
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178 def __init__(self, position, block):
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93
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179 super(ResizeSelectionHandle, self).__init__(dx=12, parent=block)
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88
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180 self.position = position
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90
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181 self.block = block
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88
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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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90
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191 self.block.sizerMoveEvent(self, event.scenePos())
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88
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192
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89
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193 class Block(QGraphicsRectItem):
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92
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194 """ Represents a block in the diagram. """
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88
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195 def __init__(self, name='Untitled', parent=None):
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89
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196 super(Block, self).__init__(parent)
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90
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197 self.selectionHandles = [ResizeSelectionHandle(i, self) for i in range(8)]
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88
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198 # Properties of the rectangle:
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199 self.setPen(QPen(Qt.blue, 2))
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200 self.setBrush(QBrush(Qt.lightGray))
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201 self.setFlags(self.ItemIsSelectable | self.ItemIsMovable | self.ItemSendsScenePositionChanges)
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202 self.setCursor(QCursor(Qt.PointingHandCursor))
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92
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203 self.setAcceptHoverEvents(True)
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88
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204 self.label = QGraphicsTextItem(name, self)
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205 self.name = name
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206 # Create corner for resize:
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207 button = QPushButton('+in')
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208 button.clicked.connect(self.newInputPort)
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209 self.buttonItemAddInput = QGraphicsProxyWidget(self)
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210 self.buttonItemAddInput.setWidget(button)
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211 self.buttonItemAddInput.setVisible(False)
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212 button = QPushButton('+out')
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213 button.clicked.connect(self.newOutputPort)
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214 self.buttonItemAddOutput = QGraphicsProxyWidget(self)
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215 self.buttonItemAddOutput.setWidget(button)
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216 self.buttonItemAddOutput.setVisible(False)
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217 # Inputs and outputs of the block:
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218 self.inputs = []
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219 self.outputs = []
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91
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220 self.changeSize(2,2)
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88
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221 def editParameters(self):
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222 pd = ParameterDialog(self, self.window())
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223 pd.exec_()
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224 def newInputPort(self):
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225 names = [i.name for i in self.inputs + self.outputs]
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226 self.addInput(InputPort(uniqify('in', names), self))
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227 def newOutputPort(self):
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228 names = [i.name for i in self.inputs + self.outputs]
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229 self.addOutput(OutputPort(uniqify('out', names), self))
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230 def setName(self, name): self.label.setPlainText(name)
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231 def getName(self): return self.label.toPlainText()
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232 name = property(getName, setName)
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233 def getDict(self):
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234 d = {'x': self.scenePos().x(), 'y': self.scenePos().y()}
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235 rect = self.rect()
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236 d.update({'width': rect.width(), 'height': rect.height()})
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91
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237 d['name'] = self.name
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88
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238 d['inputs'] = [inp.Dict for inp in self.inputs]
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239 d['outputs'] = [outp.Dict for outp in self.outputs]
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240 return d
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241 def setDict(self, d):
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242 self.name = d['name']
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243 self.setPos(d['x'], d['y'])
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244 self.changeSize(d['width'], d['height'])
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92
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245 for inp in d['inputs']:
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246 self.addInput(InputPort(inp['name'], self))
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247 for outp in d['outputs']:
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248 self.addOutput(OutputPort(outp['name'], self))
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88
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249 Dict = property(getDict, setDict)
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250 def addInput(self, i):
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251 self.inputs.append(i)
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252 self.updateSize()
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253 def addOutput(self, o):
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254 self.outputs.append(o)
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255 self.updateSize()
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256 def contextMenuEvent(self, event):
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257 menu = QMenu()
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258 pa = menu.addAction('Parameters')
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259 pa.triggered.connect(self.editParameters)
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260 menu.exec_(event.screenPos())
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261 def itemChange(self, change, value):
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262 if change == self.ItemSelectedHasChanged:
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263 for child in [self.buttonItemAddInput, self.buttonItemAddOutput]:
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264 child.setVisible(value)
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90
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265 if value:
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266 self.repositionAndShowHandles()
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267 else:
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268 [h.setVisible(False) for h in self.selectionHandles]
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269
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89
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270 return super(Block, self).itemChange(change, value)
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91
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271 def hoverEnterEvent(self, event):
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92
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272 if not self.isSelected():
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273 self.repositionAndShowHandles()
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91
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274 super(Block, self).hoverEnterEvent(event)
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275 def hoverLeaveEvent(self, event):
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92
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276 if not self.isSelected():
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277 [h.setVisible(False) for h in self.selectionHandles]
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91
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278 super(Block, self).hoverLeaveEvent(event)
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88
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279 def myDelete(self):
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280 for p in self.inputs + self.outputs:
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281 if p.connection: p.connection.myDelete()
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282 self.scene().removeItem(self)
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90
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283 def repositionAndShowHandles(self):
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284 r = self.rect()
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285 self.selectionHandles[Position.TOP_LEFT].setPos(r.topLeft())
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286 self.selectionHandles[Position.TOP].setPos(r.center().x(), r.top())
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287 self.selectionHandles[Position.TOP_RIGHT].setPos(r.topRight())
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288 self.selectionHandles[Position.RIGHT].setPos(r.right(), r.center().y())
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289 self.selectionHandles[Position.BOTTOM_RIGHT].setPos(r.bottomRight())
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290 self.selectionHandles[Position.BOTTOM].setPos(r.center().x(), r.bottom())
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291 self.selectionHandles[Position.BOTTOM_LEFT].setPos(r.bottomLeft())
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292 self.selectionHandles[Position.LEFT].setPos(r.left(), r.center().y())
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293 for h in self.selectionHandles:
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294 h.setVisible(True)
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295 def sizerMoveEvent(self, handle, pos):
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296 r = self.rect().translated(self.pos())
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297 if handle.position == Position.TOP_LEFT: r.setTopLeft(pos)
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298 elif handle.position == Position.TOP: r.setTop(pos.y())
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299 elif handle.position == Position.TOP_RIGHT: r.setTopRight(pos)
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300 elif handle.position == Position.RIGHT: r.setRight(pos.x())
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301 elif handle.position == Position.BOTTOM_RIGHT: r.setBottomRight(pos)
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302 elif handle.position == Position.BOTTOM: r.setBottom(pos.y())
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303 elif handle.position == Position.BOTTOM_LEFT: r.setBottomLeft(pos)
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304 elif handle.position == Position.LEFT: r.setLeft(pos.x())
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305 else:
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306 print('invalid position')
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307 self.setCenterAndSize(r.center(), r.size())
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308 self.repositionAndShowHandles()
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88
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309 def updateSize(self):
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310 rect = self.rect()
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311 h, w = rect.height(), rect.width()
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312 self.buttonItemAddInput.setPos(0, h + 4)
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313 self.buttonItemAddOutput.setPos(w+10, h+4)
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314 for inp, y in zip(self.inputs, equalSpace(len(self.inputs), h)):
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315 inp.setPos(0.0, y)
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316 for outp, y in zip(self.outputs, equalSpace(len(self.outputs), h)):
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317 outp.setPos(w, y)
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318 def setCenterAndSize(self, center, size):
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319 self.changeSize(size.width(), size.height())
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320 p = QPointF(size.width(), size.height())
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321 self.setPos(center - p / 2)
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322 def changeSize(self, w, h):
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99
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323 minw = 150
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324 minh = 50
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325 h = minh if h < minh else h
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326 w = minw if w < minw else w
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88
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327 self.setRect(0.0, 0.0, w, h)
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328 rect = self.label.boundingRect()
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329 self.label.setPos((w - rect.width()) / 2, (h - rect.height()) / 2)
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330 self.updateSize()
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331
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90
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332 class CodeBlock(Block):
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333 def __init__(self, name='Untitled', parent=None):
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334 super(CodeBlock, self).__init__(name, parent)
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335 self.code = ''
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336 def setDict(self, d):
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92
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337 super(CodeBlock, self).setDict(d)
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90
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338 self.code = d['code']
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92
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339 def getDict(self):
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340 d = super(CodeBlock, self).getDict()
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341 d['code'] = self.code
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342 return d
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90
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343 def gencode(self):
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344 c = ['def {0}():'.format(self.name)]
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345 if self.code:
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346 c += indent(self.code.split('\n'))
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347 else:
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348 c += indent(['pass'])
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349 return c
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350
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351 class DiagramBlock(Block):
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352 def __init__(self, name='Untitled', parent=None):
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353 super(DiagramBlock, self).__init__(name, parent)
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354 self.subModel = DiagramScene()
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355 self.subModel.containingBlock = self
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356 def setDict(self, d):
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357 self.subModel.Dict = d['submodel']
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93
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358 def mouseDoubleClickEvent(self, event):
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359 # descent into child diagram
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360 #self.editParameters()
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361 print('descent')
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362 scene = self.scene()
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363 if scene:
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364 for view in scene.views():
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365 view.diagram = self.subModel
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366 view.zoomAll()
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90
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367
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88
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368 class DiagramScene(QGraphicsScene):
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92
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369 """ A diagram scene consisting of blocks and connections """
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93
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370 structureChanged = pyqtSignal()
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88
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371 def __init__(self):
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372 super(DiagramScene, self).__init__()
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373 self.startedConnection = None
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374
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92
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375 blocks = property(lambda sel: [i for i in sel.items() if isinstance(i, Block)])
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88
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376 connections = property(lambda sel: [i for i in sel.items() if type(i) is Connection])
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93
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377 def addItem(self, item):
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378 super(DiagramScene, self).addItem(item)
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379 if isinstance(item, Block):
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380 self.structureChanged.emit()
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381 def removeItem(self, item):
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382 super(DiagramScene, self).removeItem(item)
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383 if isinstance(item, Block):
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384 self.structureChanged.emit()
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88
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385 def setDict(self, d):
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386 for block in d['blocks']:
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89
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387 b = Block()
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88
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388 self.addItem(b)
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389 b.Dict = block
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390 for con in d['connections']:
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391 fromPort = self.findPort(con['fromBlock'], con['fromPort'])
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392 toPort = self.findPort(con['toBlock'], con['toPort'])
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393 self.addItem(Connection(fromPort, toPort))
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394 def getDict(self):
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395 return {'blocks': [b.Dict for b in self.blocks], 'connections': [c.Dict for c in self.connections]}
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396 Dict = property(getDict, setDict)
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397 def gencode(self):
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398 c = []
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399 for b in self.blocks:
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400 c += b.gencode()
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401 for b in self.blocks:
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402 c.append('{0}()'.format(b.name))
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403 return c
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404 def findPort(self, blockname, portname):
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405 block = self.findBlock(blockname)
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406 if block:
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407 for port in block.inputs + block.outputs:
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408 if port.name == portname: return port
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409 def findBlock(self, blockname):
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410 for block in self.blocks:
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411 if block.name == blockname: return block
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91
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412 def uniqify(self, name):
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88
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413 blocknames = [item.name for item in self.blocks]
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91
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414 return uniqify(name, blocknames)
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88
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415 def mouseMoveEvent(self, event):
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416 if self.startedConnection:
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417 pos = event.scenePos()
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418 self.startedConnection.setEndPos(pos)
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419 super(DiagramScene, self).mouseMoveEvent(event)
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420 def mouseReleaseEvent(self, event):
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421 if self.startedConnection:
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422 for item in self.items(event.scenePos()):
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423 if type(item) is InputPort and item.connection == None:
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424 self.startedConnection.setToPort(item)
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425 self.startedConnection = None
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426 return
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427 self.startedConnection.myDelete()
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428 self.startedConnection = None
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|
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429 super(DiagramScene, self).mouseReleaseEvent(event)
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430 def startConnection(self, port):
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431 self.startedConnection = Connection(port, None)
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432 pos = port.scenePos()
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433 self.startedConnection.setEndPos(pos)
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434 self.addItem(self.startedConnection)
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435 def deleteItems(self):
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|
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436 for item in list(self.selectedItems()): item.myDelete()
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|
89
|
437
|
