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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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53
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8 """
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9 Author: Windel Bouwman
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10 Year: 2012
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11 Description: This script implements a diagram editor.
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12 run with python 3.x as:
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13 $ python [thisfile.py]
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14 """
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15
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49
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16 class Connection(QGraphicsPathItem):
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17 """ Implementation of a connection between blocks """
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18 def __init__(self, fromPort, toPort):
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19 super(Connection, self).__init__()
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20 self.pos1 = None
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21 self.pos2 = None
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22 self.fromPort = None
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23 self.toPort = None
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51
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24 #self.setFlags(self.ItemIsSelectable | self.ItemIsMovable)
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25 self.setFlags(self.ItemIsSelectable)
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26 pen = QPen(Qt.blue, 2)
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27 pen.setCapStyle(Qt.RoundCap)
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28 self.setPen(pen)
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29 arrowPath = QPainterPath(QPointF(0.0, 0.0))
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30 arrowPath.lineTo(-6.0, 10.0)
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31 arrowPath.lineTo(6.0, 10.0)
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32 arrowPath.lineTo(0.0, 0.0)
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33 self.arrowhead = QGraphicsPathItem(arrowPath, self)
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34 self.arrowhead.setPen(pen)
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35 self.arrowhead.setBrush(QBrush(pen.color()))
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36 self.setFromPort(fromPort)
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37 self.setToPort(toPort)
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53
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38 #def shape(self):
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39 # return self.path()
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44
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40 def setFromPort(self, fromPort):
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53
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41 if self.fromPort:
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42 self.fromPort.posCallbacks.remove(self.setBeginPos)
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44
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43 self.fromPort = fromPort
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44 if self.fromPort:
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46
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45 self.setBeginPos(fromPort.scenePos())
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46 self.fromPort.posCallbacks.append(self.setBeginPos)
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47 def setToPort(self, toPort):
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48 if self.toPort:
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49 self.toPort.posCallbacks.remove(self.setEndPos)
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50 self.toPort = toPort
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51 if self.toPort:
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52 self.setEndPos(toPort.scenePos())
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53 self.toPort.posCallbacks.append(self.setEndPos)
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53
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54 def releasePorts(self):
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55 self.setFromPort(None)
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56 self.setToPort(None)
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44
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57 def setBeginPos(self, pos1):
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58 self.pos1 = pos1
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59 self.updateLineStukken()
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60 def setEndPos(self, endpos):
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61 self.pos2 = endpos
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62 self.updateLineStukken()
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63 def updateLineStukken(self):
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64 """
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65 This algorithm determines the optimal routing of all signals.
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66 TODO: implement nice automatic line router
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67 """
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68 if self.pos1 is None or self.pos2 is None:
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69 return
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50
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70 # TODO: do not get the scene here?
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71 ds = editor.diagramScene
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72 self.arrowhead.setPos(self.pos2)
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73
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74 # TODO: create pieces of lines.
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75
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76 # Determine the begin and end positions:
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77 p1 = self.pos1
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78 p4 = self.pos2
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79 x1, y1 = self.pos1.x(), self.pos1.y()
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80 x4, y4 = self.pos2.x(), self.pos2.y()
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81
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82 def stripHits(hits):
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83 """ Helper function that removes object hits """
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84 hits = [hit for hit in hits if type(hit) is BlockItem]
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85 if self in hits:
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86 hits.remove(self)
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87 if self.fromPort in hits:
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88 hits.remove(self.fromPort)
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89 if self.toPort in hits:
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90 hits.remove(self.toPort)
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91 return hits
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92
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93 def viaPoints(pA, pB):
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94 # Construct intermediate points:
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95
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96 pAB1 = QPointF(pA.x(), pB.y())
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97 pAB2 = QPointF(pB.x(), pA.y())
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98 path1 = QPainterPath(pA)
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99 path1.lineTo(pAB1)
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100 path2 = QPainterPath(pA)
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101 path2.lineTo(pAB2)
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102 if len(stripHits(ds.items(path1))) > len(stripHits(ds.items(path2))):
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103 pAB = pAB2
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104 else:
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105 pAB = pAB1
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106 return [pAB]
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107
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108 # Determine left or right:
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109 dx = QPointF(20, 0)
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110 if len(stripHits(ds.items(p1 + dx))) > len(stripHits(ds.items(p1 - dx))):
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111 p2 = p1 - dx
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112 else:
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113 p2 = p1 + dx
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114
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115 if len(stripHits(ds.items(p4 + dx))) > len(stripHits(ds.items(p4 - dx))):
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116 p3 = p4 - dx
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117 self.arrowhead.setRotation(90)
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118 else:
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119 p3 = p4 + dx
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120 self.arrowhead.setRotation(-90)
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121
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122 path = QPainterPath(p1)
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123 path.lineTo(p2)
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124 # Now move from p2 to p3 without hitting blocks:
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125 pts = viaPoints(p2, p3)
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126 for pt in pts:
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127 path.lineTo(pt)
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128 path.lineTo(p3)
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129 path.lineTo(p4)
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130
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131 hits = stripHits(ds.items(path))
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132 self.setPath(path)
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133
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134 def delete(self):
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135 editor.diagramScene.removeItem(self)
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136 # Remove position update callbacks:
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137
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138 class ParameterDialog(QDialog):
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139 def __init__(self, block, parent = None):
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140 super(ParameterDialog, self).__init__(parent)
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141 self.block = block
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142 self.button = QPushButton('Ok', self)
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143 l = QGridLayout(self)
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144 l.addWidget(QLabel('Name:', self), 0, 0)
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145 self.nameEdit = QLineEdit(self.block.name)
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146 l.addWidget(self.nameEdit, 0, 1)
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147 l.addWidget(self.button, 1, 0)
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148 self.button.clicked.connect(self.OK)
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149 def OK(self):
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150 self.block.setName(self.nameEdit.text())
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151 self.close()
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152 # TODO: merge dialogs?
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153
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154 class AddPortDialog(QDialog):
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155 def __init__(self, block, parent = None):
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156 super(AddPortDialog, self).__init__(parent)
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157 self.block = block
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158 l = QGridLayout(self)
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159 l.addWidget(QLabel('Name:', self), 0, 0)
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160 self.nameEdit = QLineEdit('bla')
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161 l.addWidget(self.nameEdit, 0, 1)
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162 self.button = QPushButton('Ok', self)
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163 l.addWidget(self.button, 1, 0)
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164 self.button.clicked.connect(self.OK)
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165
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166 def OK(self):
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167 name = self.nameEdit.text()
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168 self.block.addOutput(PortItem(name, self.block, 'output'))
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169 self.close()
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170
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171 class PortItem(QGraphicsPathItem):
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172 """ Represents a port to a subsystem """
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173 def __init__(self, name, block, direction):
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174 super(PortItem, self).__init__(block)
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175 #QRectF(-6,-6,12.0,12.0)
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176 path = QPainterPath()
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177 if direction == 'input':
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178 d = 5.0
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179 path.moveTo(-d, -d)
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180 path.lineTo(0.0, 0.0)
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181 path.lineTo(-d, d)
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182 else:
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183 d = 5.0
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184 path.moveTo(0.0, -d)
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185 path.lineTo(d, 0.0)
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186 path.lineTo(0.0, d)
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187 self.setPath(path)
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188 self.direction = direction
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189 self.block = block
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190 self.setCursor(QCursor(Qt.CrossCursor))
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191 #self.setBrush(QBrush(Qt.red))
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192 self.setPen(QPen(Qt.blue, 2))
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193 self.name = name
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194 self.textItem = QGraphicsTextItem(name, self)
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195 self.setName(name)
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196 self.posCallbacks = []
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197 self.setFlag(self.ItemSendsScenePositionChanges, True)
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198 def setName(self, name):
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199 self.name = name
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200 self.textItem.setPlainText(name)
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201 rect = self.textItem.boundingRect()
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202 lw, lh = rect.width(), rect.height()
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203 if self.direction == 'input':
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204 lx = 3
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205 else:
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206 lx = -3 - lw
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207 self.textItem.setPos(lx, -lh / 2) # TODO
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208 def itemChange(self, change, value):
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209 if change == self.ItemScenePositionHasChanged:
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210 for cb in self.posCallbacks:
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211 cb(value)
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212 return value
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213 return super(PortItem, self).itemChange(change, value)
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214 def mousePressEvent(self, event):
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215 editor.startConnection(self)
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216
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217 class OutputPort(PortItem):
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218 # TODO: create a subclass OR make a member porttype
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219 pass
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220
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221 # Block part:
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222 class HandleItem(QGraphicsEllipseItem):
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223 """ A handle that can be moved by the mouse """
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224 def __init__(self, parent=None):
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225 super(HandleItem, self).__init__(QRectF(-4.0,-4.0,8.0,8.0), parent)
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226 self.posChangeCallbacks = []
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227 self.setBrush(QBrush(Qt.white))
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228 self.setFlags(self.ItemIsMovable | self.ItemSendsScenePositionChanges)
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229 self.setCursor(QCursor(Qt.SizeFDiagCursor))
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230
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231 def itemChange(self, change, value):
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232 if change == self.ItemPositionChange:
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233 #value = value.toPointF()
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234 x, y = value.x(), value.y()
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235 # TODO: make this a signal?
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236 # This cannot be a signal because this is not a QObject
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237 for cb in self.posChangeCallbacks:
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238 res = cb(x, y)
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239 if res:
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240 x, y = res
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241 value = QPointF(x, y)
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242 return value
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243 # Call superclass method:
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244 return super(HandleItem, self).itemChange(change, value)
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245
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246 class BlockItem(QGraphicsRectItem):
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247 """
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248 Represents a block in the diagram
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249 Has an x and y and width and height
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250 width and height can only be adjusted with a tip in the lower right corner.
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251
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252 - in and output ports
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253 - parameters
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254 - description
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255 """
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256 def __init__(self, name='Untitled', parent=None):
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257 super(BlockItem, self).__init__(parent)
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258 # Properties of the rectangle:
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259 self.setPen(QPen(Qt.blue, 2))
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260 self.setBrush(QBrush(Qt.lightGray))
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261 self.setFlags(self.ItemIsSelectable | self.ItemIsMovable)
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262 self.setCursor(QCursor(Qt.PointingHandCursor))
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263 self.label = QGraphicsTextItem(name, self)
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264 self.name = name
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265 # Create corner for resize:
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266 self.sizer = HandleItem(self)
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267 self.sizer.posChangeCallbacks.append(self.changeSize) # Connect the callback
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268 #self.sizer.setVisible(False)
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269 self.sizer.setFlag(self.sizer.ItemIsSelectable, True)
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270
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271 # Inputs and outputs of the block:
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272 self.inputs = []
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273 self.outputs = []
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274 # Update size:
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275 self.changeSize(60, 40)
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276 def editParameters(self):
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277 pd = ParameterDialog(self, self.window())
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278 pd.exec_()
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279 def addPort(self):
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280 pd = AddPortDialog(self, self.window())
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281 pd.exec_()
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282 def setName(self, name):
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283 self.name = name
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284 self.label.setPlainText(name)
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285 def addInput(self, i):
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286 self.inputs.append(i)
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287 self.updateSize()
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288 def addOutput(self, o):
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289 self.outputs.append(o)
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290 self.updateSize()
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291
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292 def contextMenuEvent(self, event):
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293 menu = QMenu()
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294 da = menu.addAction('Delete')
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295 da.triggered.connect(self.delete)
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296 pa = menu.addAction('Parameters')
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297 pa.triggered.connect(self.editParameters)
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298 pa = menu.addAction('Add port')
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299 pa.triggered.connect(self.addPort)
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300 menu.exec_(event.screenPos())
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301
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302 def delete(self):
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303 editor.diagramScene.removeItem(self)
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304 # TODO: remove connections
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305
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306 def updateSize(self):
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307 rect = self.rect()
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308 h, w = rect.height(), rect.width()
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309 if len(self.inputs) == 1:
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310 self.inputs[0].setPos(0.0, h / 2)
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311 elif len(self.inputs) > 1:
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312 y = 15
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313 dy = (h - 30) / (len(self.inputs) - 1)
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314 for inp in self.inputs:
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315 inp.setPos(0.0, y)
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316 y += dy
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317 if len(self.outputs) == 1:
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318 self.outputs[0].setPos(w, h / 2)
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319 elif len(self.outputs) > 1:
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320 y = 15
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321 dy = (h - 30) / (len(self.outputs) - 1)
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322 for outp in self.outputs:
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323 outp.setPos(w, y)
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324 y += dy
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325
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326 def changeSize(self, w, h):
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327 """ Resize block function """
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328 # Limit the block size:
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329 if h < 20:
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330 h = 20
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331 if w < 40:
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332 w = 40
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333 self.setRect(0.0, 0.0, w, h)
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334 # center label:
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335 rect = self.label.boundingRect()
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336 lw, lh = rect.width(), rect.height()
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337 lx = (w - lw) / 2
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338 ly = (h - lh) / 2
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339 self.label.setPos(lx, ly)
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340 # Update port positions:
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341 self.updateSize()
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342 return w, h
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343
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344 class EditorGraphicsView(QGraphicsView):
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345 def __init__(self, scene, parent=None):
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346 QGraphicsView.__init__(self, scene, parent)
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347 def dragEnterEvent(self, event):
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348 if event.mimeData().hasFormat('component/name'):
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349 event.accept()
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350 def dragMoveEvent(self, event):
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351 if event.mimeData().hasFormat('component/name'):
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352 event.accept()
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353 def dropEvent(self, event):
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354 if event.mimeData().hasFormat('component/name'):
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355 name = bytes(event.mimeData().data('component/name')).decode()
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356 b1 = BlockItem(name)
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357 b1.setPos(self.mapToScene(event.pos()))
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358 self.scene().addItem(b1)
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359
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360 class LibraryModel(QStandardItemModel):
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361 def __init__(self, parent=None):
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362 QStandardItemModel.__init__(self, parent)
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363 def mimeTypes(self):
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364 return ['component/name']
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365 def mimeData(self, idxs):
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366 mimedata = QMimeData()
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367 for idx in idxs:
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368 if idx.isValid():
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369 txt = self.data(idx, Qt.DisplayRole) # python 3
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44
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370 mimedata.setData('component/name', txt)
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371 return mimedata
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372
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373 class DiagramScene(QGraphicsScene):
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374 def __init__(self, parent=None):
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375 super(DiagramScene, self).__init__(parent)
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376 def mouseMoveEvent(self, mouseEvent):
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377 editor.sceneMouseMoveEvent(mouseEvent)
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378 super(DiagramScene, self).mouseMoveEvent(mouseEvent)
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379 def mouseReleaseEvent(self, mouseEvent):
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380 editor.sceneMouseReleaseEvent(mouseEvent)
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381 super(DiagramScene, self).mouseReleaseEvent(mouseEvent)
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382
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383 class DiagramEditor(QWidget):
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384 def __init__(self, parent=None):
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46
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385 QWidget.__init__(self, parent)
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44
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386 self.setWindowTitle("Diagram editor")
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387
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388 # Widget layout and child widgets:
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46
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389 self.horizontalLayout = QHBoxLayout(self)
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390 self.libraryBrowserView = QListView(self)
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45
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391 self.libraryBrowserView.setMaximumWidth(160)
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44
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392 self.libraryModel = LibraryModel(self)
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393 self.libraryModel.setColumnCount(1)
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394 # Create an icon with an icon:
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395 pixmap = QPixmap(60, 60)
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396 pixmap.fill()
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397 painter = QPainter(pixmap)
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398 painter.fillRect(10, 10, 40, 40, Qt.blue)
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399 painter.setBrush(Qt.red)
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400 painter.drawEllipse(36, 2, 20, 20)
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401 painter.setBrush(Qt.yellow)
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402 painter.drawEllipse(20, 20, 20, 20)
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403 painter.end()
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404
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52
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405 # Fill library:
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44
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406 self.libItems = []
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46
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407 self.libItems.append( QStandardItem(QIcon(pixmap), 'Block') )
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408 self.libItems.append( QStandardItem(QIcon(pixmap), 'Uber Unit') )
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409 self.libItems.append( QStandardItem(QIcon(pixmap), 'Device') )
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44
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410 for i in self.libItems:
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411 self.libraryModel.appendRow(i)
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412 self.libraryBrowserView.setModel(self.libraryModel)
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413 self.libraryBrowserView.setViewMode(self.libraryBrowserView.IconMode)
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414 self.libraryBrowserView.setDragDropMode(self.libraryBrowserView.DragOnly)
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415
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416 self.diagramScene = DiagramScene(self)
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417 self.diagramView = EditorGraphicsView(self.diagramScene, self)
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418 self.horizontalLayout.addWidget(self.libraryBrowserView)
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419 self.horizontalLayout.addWidget(self.diagramView)
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420
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421 self.startedConnection = None
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422 fullScreenShortcut = QShortcut(QKeySequence("F11"), self)
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423 fullScreenShortcut.activated.connect(self.toggleFullScreen)
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46
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424 saveShortcut = QShortcut(QKeySequence(QKeySequence.Save), self)
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425 saveShortcut.activated.connect(self.save)
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48
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426 testShortcut = QShortcut(QKeySequence("F12"), self)
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427 testShortcut.activated.connect(self.test)
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428 zoomShortcut = QShortcut(QKeySequence("F8"), self)
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429 zoomShortcut.activated.connect(self.zoomAll)
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52
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430 delShort = QShortcut(QKeySequence.Delete, self)
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431 delShort.activated.connect(self.deleteItem)
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46
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432
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48
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433 def test(self):
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434 self.diagramView.rotate(11)
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46
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435 def save(self):
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47
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436 self.saveDiagram('diagram2.usd')
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46
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437
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438 def saveDiagram(self, filename):
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439 items = self.diagramScene.items()
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440 blocks = [item for item in items if type(item) is BlockItem]
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49
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441 connections = [item for item in items if type(item) is Connection]
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47
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442
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443 doc = md.Document()
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444 modelElement = doc.createElement('system')
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445 doc.appendChild(modelElement)
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446 for block in blocks:
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447 blockElement = doc.createElement("block")
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448 x, y = block.scenePos().x(), block.scenePos().y()
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449 rect = block.rect()
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450 w, h = rect.width(), rect.height()
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50
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451 blockElement.setAttribute("name", block.name)
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49
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452 blockElement.setAttribute("x", str(int(x)))
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453 blockElement.setAttribute("y", str(int(y)))
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454 blockElement.setAttribute("width", str(int(w)))
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455 blockElement.setAttribute("height", str(int(h)))
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48
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456 for inp in block.inputs:
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457 portElement = doc.createElement("input")
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458 portElement.setAttribute("name", inp.name)
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459 blockElement.appendChild(portElement)
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460 for outp in block.outputs:
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461 portElement = doc.createElement("output")
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462 portElement.setAttribute("name", outp.name)
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463 blockElement.appendChild(portElement)
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47
|
464 modelElement.appendChild(blockElement)
|
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49
|
465 for connection in connections:
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466 connectionElement = doc.createElement("connection")
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|
|
467 fromPort = connection.fromPort.name
|
|
|
468 toPort = connection.toPort.name
|
|
50
|
469 fromBlock = connection.fromPort.block.name
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|
|
470 toBlock = connection.toPort.block.name
|
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49
|
471 connectionElement.setAttribute("fromBlock", fromBlock)
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|
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472 connectionElement.setAttribute("fromPort", fromPort)
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473 connectionElement.setAttribute("toBlock", toBlock)
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474 connectionElement.setAttribute("toPort", toPort)
|
|
|
475 modelElement.appendChild(connectionElement)
|
|
46
|
476 with open(filename, 'w') as f:
|
|
47
|
477 f.write(doc.toprettyxml())
|
|
46
|
478
|
|
|
479 def loadDiagram(self, filename):
|
|
|
480 try:
|
|
47
|
481 doc = md.parse(filename)
|
|
46
|
482 except IOError as e:
|
|
|
483 print('{0} not found'.format(filename))
|
|
|
484 return
|
|
47
|
485 sysElements = doc.getElementsByTagName('system')
|
|
|
486 blockElements = doc.getElementsByTagName('block')
|
|
|
487 for sysElement in sysElements:
|
|
|
488 blockElements = sysElement.getElementsByTagName('block')
|
|
|
489 for blockElement in blockElements:
|
|
|
490 x = float(blockElement.getAttribute('x'))
|
|
|
491 y = float(blockElement.getAttribute('y'))
|
|
|
492 w = float(blockElement.getAttribute('width'))
|
|
|
493 h = float(blockElement.getAttribute('height'))
|
|
|
494 name = blockElement.getAttribute('name')
|
|
|
495 block = BlockItem(name)
|
|
46
|
496 self.diagramScene.addItem(block)
|
|
|
497 block.setPos(x, y)
|
|
|
498 block.sizer.setPos(w, h)
|
|
48
|
499 # Load ports:
|
|
49
|
500 portElements = blockElement.getElementsByTagName('input')
|
|
48
|
501 for portElement in portElements:
|
|
49
|
502 name = portElement.getAttribute('name')
|
|
53
|
503 inp = PortItem(name, block, 'input')
|
|
49
|
504 block.addInput(inp)
|
|
|
505 portElements = blockElement.getElementsByTagName('output')
|
|
|
506 for portElement in portElements:
|
|
|
507 name = portElement.getAttribute('name')
|
|
53
|
508 outp = PortItem(name, block, 'output')
|
|
49
|
509 block.addOutput(outp)
|
|
48
|
510 connectionElements = sysElement.getElementsByTagName('connection')
|
|
|
511 for connectionElement in connectionElements:
|
|
50
|
512 fromBlock = connectionElement.getAttribute('fromBlock')
|
|
|
513 fromPort = connectionElement.getAttribute('fromPort')
|
|
|
514 toBlock = connectionElement.getAttribute('toBlock')
|
|
|
515 toPort = connectionElement.getAttribute('toPort')
|
|
|
516 fromPort = self.findPort(fromBlock, fromPort)
|
|
|
517 toPort = self.findPort(toBlock, toPort)
|
|
|
518 connection = Connection(fromPort, toPort)
|
|
|
519 self.diagramScene.addItem(connection)
|
|
|
520
|
|
48
|
521 self.zoomAll()
|
|
47
|
522
|
|
50
|
523 def findPort(self, blockname, portname):
|
|
|
524 items = self.diagramScene.items()
|
|
|
525 blocks = [item for item in items if type(item) is BlockItem]
|
|
|
526 for block in [b for b in blocks if b.name == blockname]:
|
|
|
527 for port in block.inputs + block.outputs:
|
|
|
528 if port.name == portname:
|
|
|
529 return port
|
|
|
530
|
|
44
|
531 def toggleFullScreen(self):
|
|
|
532 self.setWindowState(self.windowState() ^ Qt.WindowFullScreen)
|
|
|
533 def startConnection(self, port):
|
|
|
534 self.startedConnection = Connection(port, None)
|
|
50
|
535 self.diagramScene.addItem(self.startedConnection)
|
|
48
|
536 def zoomAll(self):
|
|
|
537 """ zoom to fit all items """
|
|
|
538 rect = self.diagramScene.itemsBoundingRect()
|
|
|
539 self.diagramView.fitInView(rect, Qt.KeepAspectRatio)
|
|
52
|
540 def deleteItem(self):
|
|
|
541 items = self.diagramScene.selectedItems()
|
|
|
542 for item in items:
|
|
53
|
543 if type(item) is Connection:
|
|
|
544 item.releasePorts()
|
|
|
545 item.delete()
|
|
|
546 if type(item) is Block:
|
|
|
547 pass
|
|
|
548
|
|
44
|
549 def sceneMouseMoveEvent(self, event):
|
|
|
550 if self.startedConnection:
|
|
|
551 pos = event.scenePos()
|
|
|
552 self.startedConnection.setEndPos(pos)
|
|
|
553 def sceneMouseReleaseEvent(self, event):
|
|
|
554 # Clear the actual connection:
|
|
|
555 if self.startedConnection:
|
|
46
|
556 items = self.diagramScene.items(event.scenePos())
|
|
44
|
557 for item in items:
|
|
|
558 if type(item) is PortItem:
|
|
|
559 self.startedConnection.setToPort(item)
|
|
46
|
560 self.startedConnection = None
|
|
|
561 return
|
|
|
562 self.startedConnection.delete()
|
|
|
563 del self.startedConnection
|
|
44
|
564 self.startedConnection = None
|
|
|
565
|
|
|
566 if __name__ == '__main__':
|
|
45
|
567 if sys.version_info.major != 3:
|
|
|
568 print('Please use python 3.x')
|
|
|
569 sys.exit(1)
|
|
|
570
|
|
46
|
571 app = QApplication(sys.argv)
|
|
44
|
572 global editor
|
|
|
573 editor = DiagramEditor()
|
|
50
|
574 editor.loadDiagram('diagram2.usd')
|
|
44
|
575 editor.show()
|
|
48
|
576 editor.resize(700, 500)
|
|
50
|
577 editor.zoomAll()
|
|
44
|
578 app.exec_()
|
|
|
579
|
