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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 #from elementtree.SimpleXMLWriter import XMLWriter
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7 import xml.dom.minidom as md
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44
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8
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9 """
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10 This script implements a basic diagram editor.
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11 """
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12
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13 class Connection:
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14 """
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15 - fromPort
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16 - list of line items in between
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17 - toPort
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18 """
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19 def __init__(self, fromPort, toPort):
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20 self.pos1 = None
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21 self.pos2 = None
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22 self.pathItem = QGraphicsPathItem()
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23 pen = QPen()
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24 pen.setWidth(4)
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25 pen.setColor(Qt.blue)
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26 pen.setCapStyle(Qt.RoundCap)
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27 self.pathItem.setPen(pen)
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28 #self.pathItem.setFlags(self.pathItem.ItemIsSelectable)
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29 editor.diagramScene.addItem(self.pathItem)
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30 self.setFromPort(fromPort)
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31 self.setToPort(toPort)
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32 def setFromPort(self, fromPort):
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33 self.fromPort = fromPort
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34 if self.fromPort:
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35 self.setBeginPos(fromPort.scenePos())
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36 self.fromPort.posCallbacks.append(self.setBeginPos)
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37 def setToPort(self, toPort):
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38 self.toPort = toPort
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39 if self.toPort:
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40 self.setEndPos(toPort.scenePos())
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41 self.toPort.posCallbacks.append(self.setEndPos)
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42 def setBeginPos(self, pos1):
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43 self.pos1 = pos1
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46
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44 self.updateLineStukken()
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44
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45 def setEndPos(self, endpos):
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46 self.pos2 = endpos
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46
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47 self.updateLineStukken()
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44
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48 def updateLineStukken(self):
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49 """
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50 This algorithm determines the optimal routing of all signals.
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51 TODO: implement nice automatic line router
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52 """
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46
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53 if self.pos1 is None or self.pos2 is None:
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54 return
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55
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56 ds = editor.diagramScene
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57
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46
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58 # TODO: create pieces of lines.
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59
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60 # Determine the begin and end positions:
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61 p1 = self.pos1
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62 p4 = self.pos2
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63 x1, y1 = self.pos1.x(), self.pos1.y()
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64 x4, y4 = self.pos2.x(), self.pos2.y()
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65
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66 def stripHits(hits):
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67 """ Helper function that removes object hits """
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68 hits = [hit for hit in hits if type(hit) is BlockItem]
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69 if self.pathItem in hits:
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70 hits.remove(self.pathItem)
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71 if self.fromPort in hits:
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72 hits.remove(self.fromPort)
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73 if self.toPort in hits:
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74 hits.remove(self.toPort)
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75 return hits
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76
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77 def viaPoints(pA, pB):
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78 # Construct intermediate points:
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79
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80 pAB1 = QPointF(pA.x(), pB.y())
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81 pAB2 = QPointF(pB.x(), pA.y())
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82 path1 = QPainterPath(pA)
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83 path1.lineTo(pAB1)
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84 path2 = QPainterPath(pA)
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85 path2.lineTo(pAB2)
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86 if len(stripHits(ds.items(path1))) > len(stripHits(ds.items(path2))):
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87 pAB = pAB2
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88 else:
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89 pAB = pAB1
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90 return [pAB]
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91
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92 # Determine left or right:
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93 dx = QPointF(10, 0)
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94 if len(stripHits(ds.items(p1 + dx))) > len(stripHits(ds.items(p1 - dx))):
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95 p2 = p1 - dx
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96 else:
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97 p2 = p1 + dx
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98
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99 if len(stripHits(ds.items(p4 + dx))) > len(stripHits(ds.items(p4 - dx))):
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100 p3 = p4 - dx
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101 else:
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102 p3 = p4 + dx
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103
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104 path = QPainterPath(p1)
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105 path.lineTo(p2)
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106 # Now move from p2 to p3 without hitting blocks:
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107 pts = viaPoints(p2, p3)
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108 for pt in pts:
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109 path.lineTo(pt)
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110 path.lineTo(p3)
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111 path.lineTo(p4)
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112
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113 hits = stripHits(ds.items(path))
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114
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115 #print('Items:', hits)
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116 self.pathItem.setPath(path)
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117
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118 def delete(self):
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119 editor.diagramScene.removeItem(self.pathItem)
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120 # Remove position update callbacks:
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121
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122 class ParameterDialog(QDialog):
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123 def __init__(self, parent = None):
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124 super(ParameterDialog, self).__init__(parent)
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125 self.button = QPushButton('Ok', self)
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126 l = QVBoxLayout(self)
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127 l.addWidget(self.button)
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128 self.button.clicked.connect(self.OK)
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129 def OK(self):
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130 self.close()
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131
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132 class PortItem(QGraphicsEllipseItem):
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133 """ Represents a port to a subsystem """
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134 def __init__(self, name, parent=None):
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135 QGraphicsEllipseItem.__init__(self, QRectF(-6,-6,12.0,12.0), parent)
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136 self.setCursor(QCursor(Qt.CrossCursor))
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44
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137 # Properties:
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138 self.setBrush(QBrush(Qt.red))
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139 # Name:
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140 self.name = name
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141 self.posCallbacks = []
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142 self.setFlag(self.ItemSendsScenePositionChanges, True)
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143 def itemChange(self, change, value):
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144 if change == self.ItemScenePositionHasChanged:
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145 for cb in self.posCallbacks:
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146 cb(value)
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147 return value
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148 return super(PortItem, self).itemChange(change, value)
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149 def mousePressEvent(self, event):
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150 editor.startConnection(self)
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151
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152 # Block part:
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153 class HandleItem(QGraphicsEllipseItem):
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154 """ A handle that can be moved by the mouse """
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155 def __init__(self, parent=None):
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156 super(HandleItem, self).__init__(QRectF(-4.0,-4.0,8.0,8.0), parent)
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157 self.posChangeCallbacks = []
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158 self.setBrush(QBrush(Qt.white))
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159 self.setFlags(self.ItemIsMovable | self.ItemSendsScenePositionChanges)
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160 self.setCursor(QCursor(Qt.SizeFDiagCursor))
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161
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162 def itemChange(self, change, value):
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163 if change == self.ItemPositionChange:
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164 #value = value.toPointF()
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165 x, y = value.x(), value.y()
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166 # TODO: make this a signal?
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167 # This cannot be a signal because this is not a QObject
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168 for cb in self.posChangeCallbacks:
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169 res = cb(x, y)
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170 if res:
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171 x, y = res
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172 value = QPointF(x, y)
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173 return value
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174 # Call superclass method:
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175 return super(HandleItem, self).itemChange(change, value)
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176
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177 class BlockItem(QGraphicsRectItem):
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178 """
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179 Represents a block in the diagram
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180 Has an x and y and width and height
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181 width and height can only be adjusted with a tip in the lower right corner.
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182
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183 - in and output ports
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184 - parameters
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185 - description
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186 """
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187 def __init__(self, name='Untitled', parent=None):
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188 super(BlockItem, self).__init__(parent)
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189 w = 60.0
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190 h = 40.0
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191 # Properties of the rectangle:
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192 self.setPen(QPen(Qt.blue, 2))
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193 self.setBrush(QBrush(Qt.lightGray))
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194 self.setFlags(self.ItemIsSelectable | self.ItemIsMovable)
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195 self.setCursor(QCursor(Qt.PointingHandCursor))
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44
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196 # Label:
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197 self.label = QGraphicsTextItem(name, self)
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198 # Create corner for resize:
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199 self.sizer = HandleItem(self)
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200 self.sizer.setPos(w, h)
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201 self.sizer.posChangeCallbacks.append(self.changeSize) # Connect the callback
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202 #self.sizer.setVisible(False)
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203 self.sizer.setFlag(self.sizer.ItemIsSelectable, True)
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204
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205 # Inputs and outputs of the block:
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206 self.inputs = []
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207 self.inputs.append( PortItem('a', self) )
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208 self.inputs.append( PortItem('b', self) )
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209 self.inputs.append( PortItem('c', self) )
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210 self.outputs = []
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211 self.outputs.append( PortItem('y', self) )
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212 # Update size:
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213 self.changeSize(w, h)
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214 def editParameters(self):
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215 pd = ParameterDialog(self.window())
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216 pd.exec_()
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217
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218 def contextMenuEvent(self, event):
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219 menu = QMenu()
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220 da = menu.addAction('Delete')
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221 da.triggered.connect(self.delete)
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222 pa = menu.addAction('Parameters')
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223 pa.triggered.connect(self.editParameters)
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224 menu.exec_(event.screenPos())
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225
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226 def delete(self):
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227 editor.diagramScene.removeItem(self)
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228 # TODO: remove connections
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229
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230 def changeSize(self, w, h):
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231 """ Resize block function """
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232 # Limit the block size:
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233 if h < 20:
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234 h = 20
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235 if w < 40:
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236 w = 40
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237 self.setRect(0.0, 0.0, w, h)
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238 # center label:
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239 rect = self.label.boundingRect()
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240 lw, lh = rect.width(), rect.height()
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241 lx = (w - lw) / 2
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242 ly = (h - lh) / 2
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243 self.label.setPos(lx, ly)
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244 # Update port positions:
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245 if len(self.inputs) == 1:
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246 self.inputs[0].setPos(-4, h / 2)
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247 elif len(self.inputs) > 1:
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248 y = 5
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249 dy = (h - 10) / (len(self.inputs) - 1)
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250 for inp in self.inputs:
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251 inp.setPos(-4, y)
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252 y += dy
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253 if len(self.outputs) == 1:
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254 self.outputs[0].setPos(w+4, h / 2)
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255 elif len(self.outputs) > 1:
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256 y = 5
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257 dy = (h - 10) / (len(self.outputs) + 0)
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258 for outp in self.outputs:
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259 outp.setPos(w+4, y)
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260 y += dy
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261 return w, h
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262
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263 class EditorGraphicsView(QGraphicsView):
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264 def __init__(self, scene, parent=None):
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265 QGraphicsView.__init__(self, scene, parent)
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266 def dragEnterEvent(self, event):
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267 if event.mimeData().hasFormat('component/name'):
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268 event.accept()
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269 def dragMoveEvent(self, event):
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270 if event.mimeData().hasFormat('component/name'):
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271 event.accept()
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272 def dropEvent(self, event):
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273 if event.mimeData().hasFormat('component/name'):
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274 name = str(event.mimeData().data('component/name'))
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275 b1 = BlockItem(name)
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276 b1.setPos(self.mapToScene(event.pos()))
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277 self.scene().addItem(b1)
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278
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279 class LibraryModel(QStandardItemModel):
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280 def __init__(self, parent=None):
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281 QStandardItemModel.__init__(self, parent)
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282 def mimeTypes(self):
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283 return ['component/name']
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284 def mimeData(self, idxs):
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285 mimedata = QMimeData()
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286 for idx in idxs:
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287 if idx.isValid():
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288 #txt = self.data(idx, Qt.DisplayRole).toByteArray() # python2
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289 txt = self.data(idx, Qt.DisplayRole) # python 3
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290 mimedata.setData('component/name', txt)
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291 return mimedata
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292
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293 class DiagramScene(QGraphicsScene):
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294 def __init__(self, parent=None):
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295 super(DiagramScene, self).__init__(parent)
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296 def mouseMoveEvent(self, mouseEvent):
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297 editor.sceneMouseMoveEvent(mouseEvent)
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298 super(DiagramScene, self).mouseMoveEvent(mouseEvent)
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299 def mouseReleaseEvent(self, mouseEvent):
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300 editor.sceneMouseReleaseEvent(mouseEvent)
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301 super(DiagramScene, self).mouseReleaseEvent(mouseEvent)
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302
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303 class DiagramEditor(QWidget):
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304 def __init__(self, parent=None):
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305 QWidget.__init__(self, parent)
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306 self.setWindowTitle("Diagram editor")
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307
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308 # Widget layout and child widgets:
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309 self.horizontalLayout = QHBoxLayout(self)
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310 self.libraryBrowserView = QListView(self)
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311 self.libraryBrowserView.setMaximumWidth(160)
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312 self.libraryModel = LibraryModel(self)
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313 self.libraryModel.setColumnCount(1)
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314 # Create an icon with an icon:
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315 pixmap = QPixmap(60, 60)
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316 pixmap.fill()
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317 painter = QPainter(pixmap)
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318 painter.fillRect(10, 10, 40, 40, Qt.blue)
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319 painter.setBrush(Qt.red)
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320 painter.drawEllipse(36, 2, 20, 20)
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321 painter.setBrush(Qt.yellow)
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322 painter.drawEllipse(20, 20, 20, 20)
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323 painter.end()
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324
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325 self.libItems = []
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326 self.libItems.append( QStandardItem(QIcon(pixmap), 'Block') )
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327 self.libItems.append( QStandardItem(QIcon(pixmap), 'Uber Unit') )
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328 self.libItems.append( QStandardItem(QIcon(pixmap), 'Device') )
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329 for i in self.libItems:
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330 self.libraryModel.appendRow(i)
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331 self.libraryBrowserView.setModel(self.libraryModel)
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332 self.libraryBrowserView.setViewMode(self.libraryBrowserView.IconMode)
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333 self.libraryBrowserView.setDragDropMode(self.libraryBrowserView.DragOnly)
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334
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335 self.diagramScene = DiagramScene(self)
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336 self.diagramView = EditorGraphicsView(self.diagramScene, self)
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337 self.horizontalLayout.addWidget(self.libraryBrowserView)
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338 self.horizontalLayout.addWidget(self.diagramView)
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339
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340 self.startedConnection = None
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341 fullScreenShortcut = QShortcut(QKeySequence("F11"), self)
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342 fullScreenShortcut.activated.connect(self.toggleFullScreen)
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343 saveShortcut = QShortcut(QKeySequence(QKeySequence.Save), self)
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344 saveShortcut.activated.connect(self.save)
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345 self.loadDiagram('diagram2.usd')
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346
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347 def save(self):
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348 self.saveDiagram('diagram2.usd')
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349
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350 def saveDiagram(self, filename):
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351 items = self.diagramScene.items()
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352 blocks = [item for item in items if type(item) is BlockItem]
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353
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354 doc = md.Document()
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355 modelElement = doc.createElement('system')
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356 doc.appendChild(modelElement)
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357 for block in blocks:
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358 blockElement = doc.createElement("block")
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359 x, y = block.scenePos().x(), block.scenePos().y()
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360 rect = block.rect()
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361 w, h = rect.width(), rect.height()
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362 blockElement.setAttribute("name", block.label.toPlainText())
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363 blockElement.setAttribute("x", str(x))
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364 blockElement.setAttribute("y", str(y))
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365 blockElement.setAttribute("width", str(w))
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366 blockElement.setAttribute("height", str(h))
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367 modelElement.appendChild(blockElement)
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46
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368 with open(filename, 'w') as f:
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369 f.write(doc.toprettyxml())
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370
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371 def loadDiagram(self, filename):
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372 try:
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47
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373 doc = md.parse(filename)
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46
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374 except IOError as e:
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375 print('{0} not found'.format(filename))
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376 return
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47
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377 sysElements = doc.getElementsByTagName('system')
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378 print('systems:',sysElements)
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379 blockElements = doc.getElementsByTagName('block')
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380 print('blocks:', blockElements)
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381 for sysElement in sysElements:
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382 print('system:', sysElement)
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383 blockElements = sysElement.getElementsByTagName('block')
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384 print('blocks:', blockElements)
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385 for blockElement in blockElements:
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386 x = float(blockElement.getAttribute('x'))
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387 y = float(blockElement.getAttribute('y'))
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388 w = float(blockElement.getAttribute('width'))
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389 h = float(blockElement.getAttribute('height'))
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390 name = blockElement.getAttribute('name')
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391 block = BlockItem(name)
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46
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392 self.diagramScene.addItem(block)
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393 block.setPos(x, y)
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394 block.sizer.setPos(w, h)
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47
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395
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44
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396 def toggleFullScreen(self):
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397 self.setWindowState(self.windowState() ^ Qt.WindowFullScreen)
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398 def startConnection(self, port):
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399 self.startedConnection = Connection(port, None)
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400 def sceneMouseMoveEvent(self, event):
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401 if self.startedConnection:
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402 pos = event.scenePos()
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403 self.startedConnection.setEndPos(pos)
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404 def sceneMouseReleaseEvent(self, event):
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405 # Clear the actual connection:
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406 if self.startedConnection:
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46
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407 items = self.diagramScene.items(event.scenePos())
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44
|
408 for item in items:
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|
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409 if type(item) is PortItem:
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410 self.startedConnection.setToPort(item)
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46
|
411 self.startedConnection = None
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412 return
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413 self.startedConnection.delete()
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414 del self.startedConnection
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44
|
415 self.startedConnection = None
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416
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|
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417 if __name__ == '__main__':
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45
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418 if sys.version_info.major != 3:
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419 print('Please use python 3.x')
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420 sys.exit(1)
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421
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46
|
422 app = QApplication(sys.argv)
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44
|
423 global editor
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424 editor = DiagramEditor()
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|
|
425 editor.show()
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426 editor.resize(700, 800)
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|
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427 app.exec_()
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|
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428
|
