213 lines
7.3 KiB
HTML
213 lines
7.3 KiB
HTML
<html><head><title>Macro Shake Sketch/it</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 Shake Sketch/it</h1></div>
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<div id="mw-content-text" lang="it" dir="ltr" class="mw-content-ltr"><hr/><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="Scrolla_lo_schizzo"><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> Scrolla lo schizzo</span></h3>
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</td></tr>
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<tr>
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<th class="ctOdd">Descrizione
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</th></tr>
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<tr>
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<td class="ctEven left">Scuote uno schizzo per scoprire le sue parti non vincolate
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</td></tr>
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<tr>
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<th class="ctOdd">Autore
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</th></tr>
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<tr>
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<td class="ctEven"><a href="https://www.freecadweb.org/wiki/index.php?title=User:Ga%C3%ABl_Ecorchard&action=edit&redlink=1" class="new" title="User:Gaël Ecorchard (page does not exist)">Gaël Ecorchard</a>
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</td></tr>
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<tr>
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<th class="ctOdd">Link
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</th></tr>
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<tr>
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<td class="ctEven"><a href="https://www.freecadweb.org/wiki/index.php?title=Macros_recipes/it" title="Macros recipes/it">Esempi di macro</a><br /><a href="https://www.freecadweb.org/wiki/index.php?title=How_to_install_macros/it" title="How to install macros/it">Come installare le Macro</a><br /><a href="https://www.freecadweb.org/wiki/index.php?title=Customize_Toolbars/it" title="Customize Toolbars/it">Personalizzare la barra degli strumenti</a>
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</td></tr>
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<tr>
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<th class="ctOdd">Versione
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</th></tr>
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<tr>
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<td class="ctEven macro-version">1.1
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</td></tr>
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<tr>
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<th class="ctOdd">Data ultima modifica
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</th></tr>
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<tr>
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<td class="ctEven macro-date">2014-10-31
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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="#Scrolla_lo_schizzo"><span class="tocnumber">1</span> <span class="toctext">Scrolla lo schizzo</span></a></li>
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<li class="toclevel-1 tocsection-1"><a href="#Script"><span class="tocnumber">2</span> <span class="toctext">Script</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><p>Agita uno schizzo per scoprire le sue parti non vincolate. Entrare in modalità di modifica dello schizzo e lanciare la macro. La macro aggiunge un disturbo casuale su tutti i punti dello schizzo. Dopo il disegno viene risolto, le parti vincolate manterranno la loro posizione, parti libere si muoveranno.
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</p><p><b>Attenzione, lavorare su una copia del file perché la macro "smonta tutto" e si rischia di dover ricominciare da capo.</b>
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</p>
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<h3><span class="mw-headline" id="Script">Script</span></h3>
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<p>Macro Shake_Sketch.py
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</p>
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<pre># -*- coding: utf-8 -*-
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# FreeCAD macro to shake a sketch in order to discover its unconstrained parts.
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#
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# A Gaussian noise is introduced in all sketch points and the sketch is then
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# solved.
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# Beware that the sketch can look different because some constraints have
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# several solutions. In this case, just undo.
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#
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# This file is released under the MIT License.
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# Author: Gaël Ecorchard
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# Version:
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# - 1.1, 2014-10-31
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# * correct import for Part
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# - 1.0, 2014-08, first release.
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# Amplitude of the point displacements.
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# The standard deviation of the Gaussian noise is the largest sketch dimension
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# multiplied by this factor.
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displacement_amplitude = 0.1
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# End of configuration.
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from random import gauss
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import FreeCADGui as Gui
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from FreeCAD import Base
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import Part
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# For each sketch geometry type, map a list of points to move.
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g_geom_points = {
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Base.Vector: [1],
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Part.Line: [1, 2], # first point, last point
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Part.Circle: [0, 3], # curve, center
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Part.ArcOfCircle: [1, 2, 3], # first point, last point, center
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}
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class BoundingBox(object):
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xmin = None
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xmax = None
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ymin = None
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ymax = None
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def enlarge_x(self, x):
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if self.xmin is None:
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self.xmin = x
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self.xmax = x
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return
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if self.xmin > x:
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self.xmin = x
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return
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if self.xmax < x:
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self.xmax = x
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return
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def enlarge_y(self, y):
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if self.ymin is None:
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self.ymin = y
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self.ymax = y
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return
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if self.ymin > y:
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self.ymin = y
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return
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if self.ymax < y:
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self.ymax = y
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return
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def enlarge_point(self, point):
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self.enlarge_x(point.x)
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self.enlarge_y(point.y)
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def enlarge_line(self, line):
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self.enlarge_x(line.StartPoint.x)
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self.enlarge_x(line.EndPoint.x)
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self.enlarge_y(line.StartPoint.y)
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self.enlarge_y(line.EndPoint.y)
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def enlarge_circle(self, circle):
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self.enlarge_x(circle.Center.x - circle.Radius)
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self.enlarge_x(circle.Center.x + circle.Radius)
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self.enlarge_y(circle.Center.y - circle.Radius)
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self.enlarge_y(circle.Center.y + circle.Radius)
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def enlarge_arc_of_circle(self, arc):
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# TODO: correctly compute the arc extrema (cf. toShape().BoundBox)
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self.enlarge_x(arc.Center.x)
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self.enlarge_y(arc.Center.y)
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def get_sketch_dims(sketch):
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bbox = BoundingBox()
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for geom in sketch.Geometry:
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if isinstance(geom, Base.Vector):
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bbox.enlarge_point(geom)
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elif isinstance(geom, Part.Line):
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bbox.enlarge_line(geom)
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elif isinstance(geom, Part.Circle):
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bbox.enlarge_circle(geom)
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elif isinstance(geom, Part.ArcOfCircle):
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bbox.enlarge_arc_of_circle(geom)
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if (bbox.xmin is not None) and (bbox.ymin is not None):
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return bbox.xmax - bbox.xmin, bbox.ymax - bbox.ymin
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else:
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return 0, 0
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def add_noise(point, sigma):
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"""Add a Gaussian noise with standard deviation sigma"""
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point.x = gauss(point.x, sigma)
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point.y = gauss(point.y, sigma)
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def move_points(sketch, geom_index, sigma):
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point_indexes = g_geom_points[type(sketch.Geometry[i])]
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# Direct access to sketch.Geometry[index] does not work. This would,
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# however prevent repeated recompute.
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for point_index in point_indexes:
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point = sketch.getPoint(geom_index, point_index)
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add_noise(point, sigma)
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sketch.movePoint(geom_index, point_index, point)
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view_provider = Gui.activeDocument().getInEdit()
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# Don't know how to exit from a macro.
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do_move = True
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if not view_provider:
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do_move = False
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if do_move:
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sketch = view_provider.Object
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if sketch.TypeId != 'Sketcher::SketchObject':
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do_move = False
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if do_move:
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sigma = max(get_sketch_dims(sketch)) * displacement_amplitude
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for i in range(len((sketch.Geometry))):
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move_points(sketch, i, sigma) </pre>
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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_Shake_Sketch/it&oldid=240989">http://www.freecadweb.org/wiki/index.php?title=Macro_Shake_Sketch/it&oldid=240989</a>"</div>
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<h2>Navigation menu</h2>
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