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1 #!/usr/bin/python
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2
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3 from PyQt4.QtGui import *
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4 from PyQt4.QtCore import *
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5 import sys
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47
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6 import xml.dom.minidom as md
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44
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7
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8 """
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9 This script implements a basic diagram editor.
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10 """
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11
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49
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12 class Connection(QGraphicsPathItem):
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13 """
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14 - fromPort
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15 - list of line items in between
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16 - toPort
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17 """
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18 def __init__(self, fromPort, toPort):
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49
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19 super(Connection, self).__init__()
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44
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20 self.pos1 = None
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21 self.pos2 = None
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51
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22 #self.setFlags(self.ItemIsSelectable | self.ItemIsMovable)
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23 self.setFlags(self.ItemIsSelectable)
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24 pen = QPen(Qt.blue)
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49
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25 pen.setWidth(2)
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26 pen.setCapStyle(Qt.RoundCap)
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27 self.setPen(pen)
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51
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28 arrowPath = QPainterPath(QPointF(0.0, 0.0))
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29 arrowPath.lineTo(-6.0, 10.0)
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30 arrowPath.lineTo(6.0, 10.0)
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31 arrowPath.lineTo(0.0, 0.0)
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32 self.arrowhead = QGraphicsPathItem(arrowPath, self)
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33 self.arrowhead.setPen(pen)
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34 self.arrowhead.setBrush(QBrush(pen.color()))
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44
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35 self.setFromPort(fromPort)
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36 self.setToPort(toPort)
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51
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37 def shape(self):
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38 return self.path()
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44
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39 def setFromPort(self, fromPort):
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40 self.fromPort = fromPort
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41 if self.fromPort:
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42 self.setBeginPos(fromPort.scenePos())
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44
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43 self.fromPort.posCallbacks.append(self.setBeginPos)
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44 def setToPort(self, toPort):
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45 self.toPort = toPort
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46 if self.toPort:
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46
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47 self.setEndPos(toPort.scenePos())
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48 self.toPort.posCallbacks.append(self.setEndPos)
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49 def setBeginPos(self, pos1):
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50 self.pos1 = pos1
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51 self.updateLineStukken()
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52 def setEndPos(self, endpos):
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53 self.pos2 = endpos
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54 self.updateLineStukken()
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55 def updateLineStukken(self):
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56 """
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57 This algorithm determines the optimal routing of all signals.
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58 TODO: implement nice automatic line router
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59 """
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46
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60 if self.pos1 is None or self.pos2 is None:
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61 return
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50
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62 # TODO: do not get the scene here?
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63 ds = editor.diagramScene
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64 self.arrowhead.setPos(self.pos2)
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65
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66 # TODO: create pieces of lines.
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67
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68 # Determine the begin and end positions:
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69 p1 = self.pos1
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70 p4 = self.pos2
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71 x1, y1 = self.pos1.x(), self.pos1.y()
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72 x4, y4 = self.pos2.x(), self.pos2.y()
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73
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74 def stripHits(hits):
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75 """ Helper function that removes object hits """
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76 hits = [hit for hit in hits if type(hit) is BlockItem]
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77 if self in hits:
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78 hits.remove(self)
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79 if self.fromPort in hits:
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80 hits.remove(self.fromPort)
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81 if self.toPort in hits:
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82 hits.remove(self.toPort)
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83 return hits
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84
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85 def viaPoints(pA, pB):
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86 # Construct intermediate points:
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87
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88 pAB1 = QPointF(pA.x(), pB.y())
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89 pAB2 = QPointF(pB.x(), pA.y())
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90 path1 = QPainterPath(pA)
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91 path1.lineTo(pAB1)
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92 path2 = QPainterPath(pA)
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93 path2.lineTo(pAB2)
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94 if len(stripHits(ds.items(path1))) > len(stripHits(ds.items(path2))):
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95 pAB = pAB2
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96 else:
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97 pAB = pAB1
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98 return [pAB]
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99
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100 # Determine left or right:
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101 dx = QPointF(20, 0)
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102 if len(stripHits(ds.items(p1 + dx))) > len(stripHits(ds.items(p1 - dx))):
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103 p2 = p1 - dx
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104 else:
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105 p2 = p1 + dx
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106
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107 if len(stripHits(ds.items(p4 + dx))) > len(stripHits(ds.items(p4 - dx))):
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108 p3 = p4 - dx
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109 self.arrowhead.setRotation(90)
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110 else:
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111 p3 = p4 + dx
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112 self.arrowhead.setRotation(-90)
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113
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114 path = QPainterPath(p1)
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115 path.lineTo(p2)
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116 # Now move from p2 to p3 without hitting blocks:
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117 pts = viaPoints(p2, p3)
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118 for pt in pts:
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119 path.lineTo(pt)
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120 path.lineTo(p3)
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121 path.lineTo(p4)
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122
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123 hits = stripHits(ds.items(path))
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124 self.setPath(path)
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125
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126 def delete(self):
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127 editor.diagramScene.removeItem(self)
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128 # Remove position update callbacks:
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129
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130 class ParameterDialog(QDialog):
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131 def __init__(self, block, parent = None):
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132 super(ParameterDialog, self).__init__(parent)
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133 self.block = block
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134 self.button = QPushButton('Ok', self)
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135 l = QGridLayout(self)
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136 l.addWidget(QLabel('Name:', self), 0, 0)
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137 self.nameEdit = QLineEdit(self.block.name)
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138 l.addWidget(self.nameEdit, 0, 1)
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139 l.addWidget(self.button, 1, 0)
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140 self.button.clicked.connect(self.OK)
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141 def OK(self):
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142 self.block.setName(self.nameEdit.text())
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143 self.close()
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144 # TODO: merge dialogs?
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145
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146 class AddPortDialog(QDialog):
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147 def __init__(self, block, parent = None):
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148 super(AddPortDialog, self).__init__(parent)
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149 self.block = block
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150 l = QGridLayout(self)
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151 l.addWidget(QLabel('Name:', self), 0, 0)
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152 self.nameEdit = QLineEdit('bla')
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153 l.addWidget(self.nameEdit, 0, 1)
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154 self.button = QPushButton('Ok', self)
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155 l.addWidget(self.button, 1, 0)
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156 self.button.clicked.connect(self.OK)
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157
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158 def OK(self):
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159 name = self.nameEdit.text()
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160 self.block.addInput(PortItem(name, self.block))
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161 self.close()
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162
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163 class PortItem(QGraphicsEllipseItem):
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164 """ Represents a port to a subsystem """
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165 def __init__(self, name, block):
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166 QGraphicsEllipseItem.__init__(self, QRectF(-6,-6,12.0,12.0), block)
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167 self.block = block
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168 self.setCursor(QCursor(Qt.CrossCursor))
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169 self.setBrush(QBrush(Qt.red))
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170 self.name = name
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171 self.textItem = QGraphicsTextItem(name, self)
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172 self.textItem.setPos(10, 0) # TODO
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173 self.posCallbacks = []
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174 self.setFlag(self.ItemSendsScenePositionChanges, True)
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175 def itemChange(self, change, value):
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176 if change == self.ItemScenePositionHasChanged:
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177 for cb in self.posCallbacks:
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178 cb(value)
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179 return value
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180 return super(PortItem, self).itemChange(change, value)
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181 def mousePressEvent(self, event):
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182 editor.startConnection(self)
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183
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184 # Block part:
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185 class HandleItem(QGraphicsEllipseItem):
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186 """ A handle that can be moved by the mouse """
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187 def __init__(self, parent=None):
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188 super(HandleItem, self).__init__(QRectF(-4.0,-4.0,8.0,8.0), parent)
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189 self.posChangeCallbacks = []
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190 self.setBrush(QBrush(Qt.white))
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191 self.setFlags(self.ItemIsMovable | self.ItemSendsScenePositionChanges)
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192 self.setCursor(QCursor(Qt.SizeFDiagCursor))
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193
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194 def itemChange(self, change, value):
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195 if change == self.ItemPositionChange:
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196 #value = value.toPointF()
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197 x, y = value.x(), value.y()
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198 # TODO: make this a signal?
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199 # This cannot be a signal because this is not a QObject
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200 for cb in self.posChangeCallbacks:
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201 res = cb(x, y)
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202 if res:
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203 x, y = res
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204 value = QPointF(x, y)
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205 return value
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206 # Call superclass method:
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207 return super(HandleItem, self).itemChange(change, value)
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208
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209 class BlockItem(QGraphicsRectItem):
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210 """
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211 Represents a block in the diagram
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212 Has an x and y and width and height
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213 width and height can only be adjusted with a tip in the lower right corner.
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214
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215 - in and output ports
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216 - parameters
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217 - description
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218 """
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219 def __init__(self, name='Untitled', parent=None):
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220 super(BlockItem, self).__init__(parent)
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221 # Properties of the rectangle:
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222 self.setPen(QPen(Qt.blue, 2))
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223 self.setBrush(QBrush(Qt.lightGray))
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224 self.setFlags(self.ItemIsSelectable | self.ItemIsMovable)
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225 self.setCursor(QCursor(Qt.PointingHandCursor))
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226 self.label = QGraphicsTextItem(name, self)
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227 self.name = name
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228 # Create corner for resize:
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229 self.sizer = HandleItem(self)
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230 self.sizer.posChangeCallbacks.append(self.changeSize) # Connect the callback
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231 #self.sizer.setVisible(False)
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232 self.sizer.setFlag(self.sizer.ItemIsSelectable, True)
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233
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234 # Inputs and outputs of the block:
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235 self.inputs = []
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236 self.outputs = []
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237 # Update size:
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238 self.changeSize(60, 40)
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239 def editParameters(self):
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240 pd = ParameterDialog(self, self.window())
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241 pd.exec_()
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242 def addPort(self):
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243 pd = AddPortDialog(self, self.window())
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244 pd.exec_()
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245 def setName(self, name):
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246 self.name = name
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247 self.label.setPlainText(name)
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248 def addInput(self, i):
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249 self.inputs.append(i)
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250 self.updateSize()
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251 def addOutput(self, o):
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252 self.outputs.append(o)
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253 self.updateSize()
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254
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255 def contextMenuEvent(self, event):
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256 menu = QMenu()
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257 da = menu.addAction('Delete')
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258 da.triggered.connect(self.delete)
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259 pa = menu.addAction('Parameters')
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260 pa.triggered.connect(self.editParameters)
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261 pa = menu.addAction('Add port')
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262 pa.triggered.connect(self.addPort)
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263 menu.exec_(event.screenPos())
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264
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265 def delete(self):
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266 editor.diagramScene.removeItem(self)
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267 # TODO: remove connections
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268
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269 def updateSize(self):
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270 rect = self.rect()
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271 h, w = rect.height(), rect.width()
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272 if len(self.inputs) == 1:
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273 self.inputs[0].setPos(-4, h / 2)
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274 elif len(self.inputs) > 1:
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275 y = 8
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276 dy = (h - 16) / (len(self.inputs) - 1)
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277 for inp in self.inputs:
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278 inp.setPos(-4, y)
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279 y += dy
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280 if len(self.outputs) == 1:
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281 self.outputs[0].setPos(w+4, h / 2)
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282 elif len(self.outputs) > 1:
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283 y = 8
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284 dy = (h - 16) / (len(self.outputs) + 0)
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285 for outp in self.outputs:
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286 outp.setPos(w+4, y)
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287 y += dy
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288
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289 def changeSize(self, w, h):
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290 """ Resize block function """
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291 # Limit the block size:
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292 if h < 20:
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293 h = 20
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294 if w < 40:
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295 w = 40
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296 self.setRect(0.0, 0.0, w, h)
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297 # center label:
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298 rect = self.label.boundingRect()
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299 lw, lh = rect.width(), rect.height()
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300 lx = (w - lw) / 2
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301 ly = (h - lh) / 2
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302 self.label.setPos(lx, ly)
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303 # Update port positions:
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304 self.updateSize()
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305 return w, h
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306
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307 class EditorGraphicsView(QGraphicsView):
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308 def __init__(self, scene, parent=None):
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309 QGraphicsView.__init__(self, scene, parent)
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310 def dragEnterEvent(self, event):
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311 if event.mimeData().hasFormat('component/name'):
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312 event.accept()
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313 def dragMoveEvent(self, event):
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314 if event.mimeData().hasFormat('component/name'):
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315 event.accept()
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316 def dropEvent(self, event):
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317 if event.mimeData().hasFormat('component/name'):
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318 name = bytes(event.mimeData().data('component/name')).decode()
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319 b1 = BlockItem(name)
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320 b1.setPos(self.mapToScene(event.pos()))
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321 self.scene().addItem(b1)
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322
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323 class LibraryModel(QStandardItemModel):
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324 def __init__(self, parent=None):
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325 QStandardItemModel.__init__(self, parent)
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326 def mimeTypes(self):
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327 return ['component/name']
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328 def mimeData(self, idxs):
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329 mimedata = QMimeData()
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330 for idx in idxs:
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331 if idx.isValid():
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332 #txt = self.data(idx, Qt.DisplayRole).toByteArray() # python2
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333 txt = self.data(idx, Qt.DisplayRole) # python 3
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334 mimedata.setData('component/name', txt)
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335 return mimedata
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336
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337 class DiagramScene(QGraphicsScene):
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338 def __init__(self, parent=None):
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339 super(DiagramScene, self).__init__(parent)
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340 def mouseMoveEvent(self, mouseEvent):
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341 editor.sceneMouseMoveEvent(mouseEvent)
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342 super(DiagramScene, self).mouseMoveEvent(mouseEvent)
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343 def mouseReleaseEvent(self, mouseEvent):
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344 editor.sceneMouseReleaseEvent(mouseEvent)
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345 super(DiagramScene, self).mouseReleaseEvent(mouseEvent)
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346
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347 class DiagramEditor(QWidget):
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348 def __init__(self, parent=None):
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46
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349 QWidget.__init__(self, parent)
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350 self.setWindowTitle("Diagram editor")
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351
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352 # Widget layout and child widgets:
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46
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353 self.horizontalLayout = QHBoxLayout(self)
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354 self.libraryBrowserView = QListView(self)
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45
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355 self.libraryBrowserView.setMaximumWidth(160)
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44
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356 self.libraryModel = LibraryModel(self)
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357 self.libraryModel.setColumnCount(1)
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358 # Create an icon with an icon:
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359 pixmap = QPixmap(60, 60)
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360 pixmap.fill()
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361 painter = QPainter(pixmap)
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362 painter.fillRect(10, 10, 40, 40, Qt.blue)
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363 painter.setBrush(Qt.red)
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364 painter.drawEllipse(36, 2, 20, 20)
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365 painter.setBrush(Qt.yellow)
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366 painter.drawEllipse(20, 20, 20, 20)
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367 painter.end()
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368
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369 self.libItems = []
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46
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370 self.libItems.append( QStandardItem(QIcon(pixmap), 'Block') )
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371 self.libItems.append( QStandardItem(QIcon(pixmap), 'Uber Unit') )
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372 self.libItems.append( QStandardItem(QIcon(pixmap), 'Device') )
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44
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373 for i in self.libItems:
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374 self.libraryModel.appendRow(i)
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375 self.libraryBrowserView.setModel(self.libraryModel)
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376 self.libraryBrowserView.setViewMode(self.libraryBrowserView.IconMode)
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377 self.libraryBrowserView.setDragDropMode(self.libraryBrowserView.DragOnly)
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378
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379 self.diagramScene = DiagramScene(self)
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380 self.diagramView = EditorGraphicsView(self.diagramScene, self)
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381 self.horizontalLayout.addWidget(self.libraryBrowserView)
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382 self.horizontalLayout.addWidget(self.diagramView)
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383
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384 self.startedConnection = None
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385 fullScreenShortcut = QShortcut(QKeySequence("F11"), self)
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386 fullScreenShortcut.activated.connect(self.toggleFullScreen)
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46
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387 saveShortcut = QShortcut(QKeySequence(QKeySequence.Save), self)
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388 saveShortcut.activated.connect(self.save)
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48
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389 testShortcut = QShortcut(QKeySequence("F12"), self)
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390 testShortcut.activated.connect(self.test)
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391 zoomShortcut = QShortcut(QKeySequence("F8"), self)
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392 zoomShortcut.activated.connect(self.zoomAll)
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46
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393
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48
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394 def test(self):
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395 self.diagramView.rotate(11)
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46
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396 def save(self):
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47
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397 self.saveDiagram('diagram2.usd')
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46
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398
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399 def saveDiagram(self, filename):
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400 items = self.diagramScene.items()
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401 blocks = [item for item in items if type(item) is BlockItem]
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49
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402 connections = [item for item in items if type(item) is Connection]
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47
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403
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404 doc = md.Document()
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405 modelElement = doc.createElement('system')
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406 doc.appendChild(modelElement)
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407 for block in blocks:
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408 blockElement = doc.createElement("block")
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409 x, y = block.scenePos().x(), block.scenePos().y()
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410 rect = block.rect()
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411 w, h = rect.width(), rect.height()
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50
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412 blockElement.setAttribute("name", block.name)
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49
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413 blockElement.setAttribute("x", str(int(x)))
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414 blockElement.setAttribute("y", str(int(y)))
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415 blockElement.setAttribute("width", str(int(w)))
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416 blockElement.setAttribute("height", str(int(h)))
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48
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417 for inp in block.inputs:
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418 portElement = doc.createElement("input")
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419 portElement.setAttribute("name", inp.name)
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420 blockElement.appendChild(portElement)
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421 for outp in block.outputs:
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422 portElement = doc.createElement("output")
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423 portElement.setAttribute("name", outp.name)
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424 blockElement.appendChild(portElement)
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47
|
425 modelElement.appendChild(blockElement)
|
|
49
|
426 for connection in connections:
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|
|
427 connectionElement = doc.createElement("connection")
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|
|
428 fromPort = connection.fromPort.name
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|
|
429 toPort = connection.toPort.name
|
|
50
|
430 fromBlock = connection.fromPort.block.name
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|
|
431 toBlock = connection.toPort.block.name
|
|
49
|
432 connectionElement.setAttribute("fromBlock", fromBlock)
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433 connectionElement.setAttribute("fromPort", fromPort)
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434 connectionElement.setAttribute("toBlock", toBlock)
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|
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435 connectionElement.setAttribute("toPort", toPort)
|
|
|
436 modelElement.appendChild(connectionElement)
|
|
46
|
437 with open(filename, 'w') as f:
|
|
47
|
438 f.write(doc.toprettyxml())
|
|
46
|
439
|
|
|
440 def loadDiagram(self, filename):
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|
|
441 try:
|
|
47
|
442 doc = md.parse(filename)
|
|
46
|
443 except IOError as e:
|
|
|
444 print('{0} not found'.format(filename))
|
|
|
445 return
|
|
47
|
446 sysElements = doc.getElementsByTagName('system')
|
|
|
447 blockElements = doc.getElementsByTagName('block')
|
|
|
448 for sysElement in sysElements:
|
|
|
449 blockElements = sysElement.getElementsByTagName('block')
|
|
|
450 for blockElement in blockElements:
|
|
|
451 x = float(blockElement.getAttribute('x'))
|
|
|
452 y = float(blockElement.getAttribute('y'))
|
|
|
453 w = float(blockElement.getAttribute('width'))
|
|
|
454 h = float(blockElement.getAttribute('height'))
|
|
|
455 name = blockElement.getAttribute('name')
|
|
|
456 block = BlockItem(name)
|
|
46
|
457 self.diagramScene.addItem(block)
|
|
|
458 block.setPos(x, y)
|
|
|
459 block.sizer.setPos(w, h)
|
|
48
|
460 # Load ports:
|
|
49
|
461 portElements = blockElement.getElementsByTagName('input')
|
|
48
|
462 for portElement in portElements:
|
|
49
|
463 name = portElement.getAttribute('name')
|
|
|
464 inp = PortItem(name, block)
|
|
|
465 block.addInput(inp)
|
|
|
466 portElements = blockElement.getElementsByTagName('output')
|
|
|
467 for portElement in portElements:
|
|
|
468 name = portElement.getAttribute('name')
|
|
|
469 outp = PortItem(name, block)
|
|
|
470 block.addOutput(outp)
|
|
48
|
471 connectionElements = sysElement.getElementsByTagName('connection')
|
|
|
472 for connectionElement in connectionElements:
|
|
50
|
473 fromBlock = connectionElement.getAttribute('fromBlock')
|
|
|
474 fromPort = connectionElement.getAttribute('fromPort')
|
|
|
475 toBlock = connectionElement.getAttribute('toBlock')
|
|
|
476 toPort = connectionElement.getAttribute('toPort')
|
|
|
477 fromPort = self.findPort(fromBlock, fromPort)
|
|
|
478 toPort = self.findPort(toBlock, toPort)
|
|
|
479 connection = Connection(fromPort, toPort)
|
|
|
480 self.diagramScene.addItem(connection)
|
|
|
481
|
|
48
|
482 self.zoomAll()
|
|
47
|
483
|
|
50
|
484 def findPort(self, blockname, portname):
|
|
|
485 items = self.diagramScene.items()
|
|
|
486 blocks = [item for item in items if type(item) is BlockItem]
|
|
|
487 for block in [b for b in blocks if b.name == blockname]:
|
|
|
488 for port in block.inputs + block.outputs:
|
|
|
489 if port.name == portname:
|
|
|
490 return port
|
|
|
491
|
|
44
|
492 def toggleFullScreen(self):
|
|
|
493 self.setWindowState(self.windowState() ^ Qt.WindowFullScreen)
|
|
|
494 def startConnection(self, port):
|
|
|
495 self.startedConnection = Connection(port, None)
|
|
50
|
496 self.diagramScene.addItem(self.startedConnection)
|
|
48
|
497 def zoomAll(self):
|
|
|
498 """ zoom to fit all items """
|
|
|
499 rect = self.diagramScene.itemsBoundingRect()
|
|
|
500 self.diagramView.fitInView(rect, Qt.KeepAspectRatio)
|
|
44
|
501 def sceneMouseMoveEvent(self, event):
|
|
|
502 if self.startedConnection:
|
|
|
503 pos = event.scenePos()
|
|
|
504 self.startedConnection.setEndPos(pos)
|
|
|
505 def sceneMouseReleaseEvent(self, event):
|
|
|
506 # Clear the actual connection:
|
|
|
507 if self.startedConnection:
|
|
46
|
508 items = self.diagramScene.items(event.scenePos())
|
|
44
|
509 for item in items:
|
|
|
510 if type(item) is PortItem:
|
|
|
511 self.startedConnection.setToPort(item)
|
|
46
|
512 self.startedConnection = None
|
|
|
513 return
|
|
|
514 self.startedConnection.delete()
|
|
|
515 del self.startedConnection
|
|
44
|
516 self.startedConnection = None
|
|
|
517
|
|
|
518 if __name__ == '__main__':
|
|
45
|
519 if sys.version_info.major != 3:
|
|
|
520 print('Please use python 3.x')
|
|
|
521 sys.exit(1)
|
|
|
522
|
|
46
|
523 app = QApplication(sys.argv)
|
|
44
|
524 global editor
|
|
|
525 editor = DiagramEditor()
|
|
50
|
526 editor.loadDiagram('diagram2.usd')
|
|
44
|
527 editor.show()
|
|
48
|
528 editor.resize(700, 500)
|
|
50
|
529 editor.zoomAll()
|
|
44
|
530 app.exec_()
|
|
|
531
|
