220 lines
11 KiB
HTML
220 lines
11 KiB
HTML
<html><head><title>Macro Image Scaling</title><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><link type='text/css' href='wiki.css' rel='stylesheet'></head><body><h1>Macro Image Scaling</h1></div>
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<div id="mw-content-text" lang="en" dir="ltr" class="mw-content-ltr"><div class="mw-parser-output"><table class="fcinfobox wikitable ct" width="100%" style="float: right; width: 230px; margin-left: 10px;">
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<tr>
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<td class="ctTitle">
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<h3><span class="mw-headline" id="Image_Scaling"><a href="https://www.freecadweb.org/wiki/index.php?title=File:Text-x-python.png" class="image"><img alt="Text-x-python.png" src="32px-Text-x-python.png" width="32" height="32" srcset="/wiki/images/2/2c/Text-x-python.png 1.5x" /></a> Image Scaling</span></h3>
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</td></tr>
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<tr>
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<th class="ctOdd">Description
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</th></tr>
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<tr>
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<td class="ctEven left macro-description">Scaling of drawings
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</td></tr>
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<tr>
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<th class="ctOdd">Author
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</th></tr>
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<tr>
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<td class="ctEven macro-author"><a href="https://www.freecadweb.org/wiki/index.php?title=User:JAndersM&action=edit&redlink=1" class="new" title="User:JAndersM (page does not exist)">JAndersM</a>
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</td></tr>
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<tr>
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<th class="ctOdd">Links
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</th></tr>
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<tr>
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<td class="ctEven"><a href="Macros_recipes.html" title="Macros recipes">Macros recipes</a><br /><a href="How_to_install_macros.html" title="How to install macros">How to install macros</a><br /><a href="Customize_Toolbars.html" title="Customize Toolbars">How to customize toolbars</a>
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</td></tr>
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<tr>
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<th class="ctOdd">Version
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</th></tr>
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<tr>
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<td class="ctEven macro-version">1.0
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</td></tr>
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<tr>
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<th class="ctOdd">Date last modification
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</th></tr>
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<tr>
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<td class="ctEven macro-date">2016-01-19
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</td></tr>
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<tr>
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<th class="ctOdd">
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</th></tr>
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<tr>
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<td class="ctToc"><br /><div id="toc" class="toc"><div class="toctitle"><h2>Contents</h2></div>
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<ul>
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<li class="toclevel-1"><a href="#Image_Scaling"><span class="tocnumber">1</span> <span class="toctext">Image Scaling</span></a></li>
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<li class="toclevel-1 tocsection-1"><a href="#Description"><span class="tocnumber">2</span> <span class="toctext">Description</span></a></li>
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<li class="toclevel-1 tocsection-2"><a href="#Use"><span class="tocnumber">3</span> <span class="toctext">Use</span></a></li>
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<li class="toclevel-1 tocsection-3"><a href="#Script"><span class="tocnumber">4</span> <span class="toctext">Script</span></a></li>
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<li class="toclevel-1 tocsection-4"><a href="#Links"><span class="tocnumber">5</span> <span class="toctext">Links</span></a></li>
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</ul>
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</div>
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</td></tr>
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</table>
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<p><br />
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</p>
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<h2><span class="mw-headline" id="Description">Description</span></h2>
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<p>Macro for easy scaling of drawings, graphics, diagrams, blueprints and similar 2D images in the Image workbench. It works for images imported as planar images in the 3D space.
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</p><p>Note: For photos of objects, or images involving objects lying at different distances from the viewpoint, the effect of <a rel="nofollow" class="external text" href="https://en.wikipedia.org/wiki/Parallax">Parallax</a> (distortion due to "difference in the apparent position of an object viewed along two different lines of sight") must be kept in mind. In the following diagram the 2 blue objects are co-planar with the plane being perpendicular to the user viewpoint and scaling can be used:
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</p><p><a href="https://www.freecadweb.org/wiki/index.php?title=File:Perspective.png" class="image"><img alt="Perspective.png" src="Perspective.png" width="355" height="265" /></a>
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</p><p>In the second diagram, the red and green objects are not co-planar with the 2 blue objects and scaling can not be used. Additionally the fact that the red object is co-planar with 1 blue object can not be determined from the single diagram based on the user viewpoint:
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</p><p><a href="https://www.freecadweb.org/wiki/index.php?title=File:Parallax.jpg" class="image"><img alt="Parallax.jpg" src="Parallax.jpg" width="361" height="272" /></a>
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</p>
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<h2><span class="mw-headline" id="Use">Use</span></h2>
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<ul><li> run the Macro - a dialogue pops up</li>
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<li> click on the two points in the image that you know the true distance between</li>
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<li> Select the Image Plane in the tree view</li>
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<li> Enter the true distance in mm between the points in the text field of the dialogue and click OK</li>
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<li> The image is scaled and the dialogue closes.</li></ul>
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<h2><span class="mw-headline" id="Script">Script</span></h2>
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<pre>import FreeCADGui, FreeCAD, Part
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import math
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import pivy.coin as pvy
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from PySide import QtCore, QtGui
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import DraftTrackers, Draft
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__title__ = "Macro Image Scaling"
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__author__ = "JAndersM"
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__url__ = "http://www.freecadweb.org/index-fr.html"
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__version__ = "00.01"
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__date__ = "19/01/2016"
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try:
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_fromUtf8 = QtCore.QString.fromUtf8
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except AttributeError:
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def _fromUtf8(s):
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return s
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try:
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_encoding = QtGui.QApplication.UnicodeUTF8
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def _translate(context, text, disambig):
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return QtGui.QApplication.translate(context, text, disambig, _encoding)
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except AttributeError:
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def _translate(context, text, disambig):
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return QtGui.QApplication.translate(context, text, disambig)
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def distance(p1,p2):
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dx=p2[0]-p1[0]
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dy=p2[1]-p1[1]
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dz=p2[2]-p1[2]
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return math.sqrt(dx*dx+dy*dy+dz*dz)
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class Ui_Dialog(object):
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def setupUi(self, Dialog):
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self.view = FreeCADGui.ActiveDocument.ActiveView
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self.stack = []
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self.callback = self.view.addEventCallbackPivy(pvy.SoMouseButtonEvent.getClassTypeId(),self.getpoint)
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self.callmouse=self.view.addEventCallbackPivy(pvy.SoLocation2Event.getClassTypeId(),self.getmousepoint)
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self.distance=0
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self.dialog=Dialog
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Dialog.setObjectName(_fromUtf8("Dialog"))
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Dialog.setWindowFlags(QtCore.Qt.WindowStaysOnTopHint)
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Dialog.resize(300, 102)
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self.buttonBox = QtGui.QDialogButtonBox(Dialog)
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self.buttonBox.setGeometry(QtCore.QRect(50, 70, 191, 32))
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self.buttonBox.setOrientation(QtCore.Qt.Horizontal)
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self.buttonBox.setStandardButtons(QtGui.QDialogButtonBox.Cancel.__or__(QtGui.QDialogButtonBox.Ok))
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self.buttonBox.setObjectName(_fromUtf8("buttonBox"))
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self.buttonBox.button(QtGui.QDialogButtonBox.Ok).setEnabled(False)
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self.label = QtGui.QLabel(Dialog)
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self.label.setGeometry(QtCore.QRect(30, 10, 66, 17))
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self.label.setObjectName(_fromUtf8("label"))
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self.lineEdit = QtGui.QLineEdit(Dialog)
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self.lineEdit.setGeometry(QtCore.QRect(100, 10, 113, 29))
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self.lineEdit.setObjectName(_fromUtf8("lineEdit"))
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self.label1 = QtGui.QLabel(Dialog)
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self.label1.setGeometry(QtCore.QRect(20, 45, 260, 17))
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self.label1.setObjectName(_fromUtf8("label1"))
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self.retranslateUi(Dialog)
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QtCore.QObject.connect(self.buttonBox, QtCore.SIGNAL(_fromUtf8("accepted()")), self.accept)
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QtCore.QObject.connect(self.buttonBox, QtCore.SIGNAL(_fromUtf8("rejected()")), self.reject)
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QtCore.QMetaObject.connectSlotsByName(Dialog)
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self.tracker = DraftTrackers.lineTracker(scolor=(1,0,0))
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self.tracker.raiseTracker()
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self.tracker.on()
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self.dialog.show()
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def retranslateUi(self, Dialog):
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Dialog.setWindowTitle(_translate("Dialog", "Dialog", None))
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self.label.setText(_translate("Dialog", "Distance", None))
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self.label1.setText(_translate("Dialog", "Select first point", None))
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def accept(self):
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sel = FreeCADGui.Selection.getSelection()
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try:
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locale=QtCore.QLocale.system()
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d, ok = locale.toFloat(self.lineEdit.text())
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if not ok:
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raise ValueError
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s=d/self.distance
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sel[0].XSize.Value=sel[0].XSize.Value*s
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sel[0].YSize.Value=sel[0].YSize.Value*s
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FreeCAD.Console.PrintMessage("Scale="+str(s))
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self.tracker.off()
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self.tracker.finalize()
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self.dialog.hide()
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except ValueError, ZeroDivisionError:
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self.label1.setText(_translate("Dialog", "<font color='red'>Enter distance</font>", None))
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return
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except IndexError, AttributeError:
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self.label1.setText(_translate("Dialog", "<font color='red'>Select ImagePlane</font>", None))
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return
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def reject(self):
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self.stack=[]
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self.view.removeEventCallbackPivy(pvy.SoMouseButtonEvent.getClassTypeId(),self.callback)
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self.view.removeEventCallbackPivy(pvy.SoLocation2Event.getClassTypeId(),self.callmouse)
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self.tracker.off()
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self.tracker.finalize()
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self.dialog.hide()
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def getmousepoint(self, event_cb):
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event = event_cb.getEvent()
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if len(self.stack)==1:
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pos = event.getPosition()
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point = self.view.getPoint(pos[0],pos[1])
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self.tracker.p2(point)
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def getpoint(self,event_cb):
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event = event_cb.getEvent()
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if event.getState() == pvy.SoMouseButtonEvent.DOWN:
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pos = event.getPosition()
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point = self.view.getPoint(pos[0],pos[1])
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self.stack.append(point)
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self.label1.setText(_translate("Dialog", "Select second point", None))
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if len(self.stack)==1:
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self.tracker.p1(point)
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elif len(self.stack) == 2:
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self.distance=distance(self.stack[0], self.stack[1])
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self.tracker.p2(point)
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self.view.removeEventCallbackPivy(pvy.SoMouseButtonEvent.getClassTypeId(),self.callback)
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self.view.removeEventCallbackPivy(pvy.SoLocation2Event.getClassTypeId(),self.callmouse)
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self.buttonBox.button(QtGui.QDialogButtonBox.Ok).setEnabled(True)
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self.label1.setText(_translate("Dialog", "Select Image Plane and type distance", None))
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#Init
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d = QtGui.QWidget()
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ui = Ui_Dialog()
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ui.setupUi(d) </pre>
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<h2><span class="mw-headline" id="Links">Links</span></h2>
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<ul><li> [<a rel="nofollow" class="external text" href="http://forum.freecadweb.org/viewtopic.php?f=22&t=13877">Forum discussion</a>]</li>
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<li> [<a rel="nofollow" class="external text" href="http://forum.freecadweb.org/download/file.php?id=19542">Download zip</a>]</li>
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<li> [<a rel="nofollow" class="external text" href="https://youtu.be/2iFE40uHrA8">Movie created by microelly2</a>]</li></ul>
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<p><br />
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</p>
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<div style="clear:both"></div>
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</div>
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</div>
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</div><div class="printfooter">
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Online version: "<a dir="ltr" href="https://www.freecadweb.org/wiki/index.php?title=Macro_Image_Scaling&oldid=282111">http://www.freecadweb.org/wiki/index.php?title=Macro_Image_Scaling&oldid=282111</a>"</div>
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<div id="catlinks" class="catlinks" data-mw="interface"></div><div class="visualClear"></div>
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</div>
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</div>
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<div id="mw-navigation">
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<h2>Navigation menu</h2>
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</body></html> |