Macro Shake Sketch/de

Beschreibung

Schütteln Sie eine Skizze, um ihre uneingeschränkten Teile zu entdecken.

Den Bearbeitungsmodus für eine Skizze aufrufen und das Makro starten. Das Makro fügt allen Skizzenpunkten eine zufällige Verschiebung hinzu. Die Skizze wird dann berechnet, wobei eingeschränkte Teile ihre Position beibehalten und freie Teile sich verschieben. Dieses Makro immer auf einer Kopie der ursprünglichen Skizze ausführen.

Die ursprüngliche Skizze mit den Schaltflächen Rückgängig (Strg+Z) und Wiederherstellen (Strg+Y) (mit der Bezeichnung „Shake Sketch“) wieder herstellen oder vorsichtig an einer Kopie der Datei arbeiten, da das Makro „alles zerlegt“, um es anzuzeigen, und man möglicherweise von vorne beginnen muss.

Installieren

Verfügbar im Addon-Manager, oder manuell zu installieren.

Skript

Werkzeugleisten-Symbol

Macro Shake_Sketch.py

# -*- coding: utf-8 -*-

# FreeCAD macro to shake a sketch in order to discover its unconstrained parts.
#
# A Gaussian noise is introduced in all sketch points and the sketch is then
# solved.
# Beware that the sketch can look different because some constraints have
# several solutions. In this case, just undo.
#
# This file is released under the MIT License.
# Author: Gaël Ecorchard v1.0 & v1.1
# Author: heda v1.2
# Version:
# - 1.3: 2022-06-01
#       * added openTransaction(u"Shake Sketch") for restore the original Sketch
# - 1.2: 2021-10-22
#       * made macro runnable for current versions of fc
#       * added Part.LineSegment
#       * added start info & result dialogue
#       * hides constraints during shake
#       * added simple debug printing
# - 1.1: 2014-10-31
#       * correct import for Part
# - 1.0: 2014-08
#       * first release
# Amplitude of the point displacements.
# The standard deviation of the Gaussian noise is the largest sketch dimension
# multiplied by this factor.

__title__ = 'Sketch Shaker'
__version__ = '1.3'
__date__ = '2022/06/01'
__icon__ = 'https://wiki.freecad.org/images/4/4a/Macro_Shake_Sketch.png'

displacement_amplitude = 0.1
debug_print = False

# End of configuration.

from random import gauss

from PySide.QtGui import QMessageBox

import FreeCADGui as Gui
from FreeCAD import Base
import Part

print('Running Macro ' + __title__ + ' ver: ' + __version__)
FreeCAD.ActiveDocument.openTransaction(u"Shake Sketch")    # memorise les actions (avec annuler restore)

# For each sketch geometry type, map a list of points to move.
g_geom_points = {
    Base.Vector: [1],
    Part.Line: [1, 2],  # first point, last point
    Part.LineSegment: [1, 2],  # first point, last point
    Part.Circle: [0, 3],  # curve, center
    Part.ArcOfCircle: [1, 2, 3],  # first point, last point, center
} # moves bsplines and conics via lines and circles, no op for Part.Points


def dprint(msg, *args):
    if debug_print:
        if args:
            print(msg.format(*args))
        else:
            print(msg)

class BoundingBox:
    xmin = xmax = ymin = ymax = None

    def enlarge_x(self, x):
        if self.xmin is None:
            self.xmin = self.xmax = x
        elif self.xmin > x:
            self.xmin = x
        elif self.xmax < x:
            self.xmax = x

    def enlarge_y(self, y):
        if self.ymin is None:
            self.ymin = self.ymax = y
        elif self.ymin > y:
            self.ymin = y
        elif self.ymax < y:
            self.ymax = y

    def enlarge_point(self, point):
        self.enlarge_x(point.x)
        self.enlarge_y(point.y)

    def enlarge_line(self, line):
        self.enlarge_x(line.StartPoint.x)
        self.enlarge_x(line.EndPoint.x)
        self.enlarge_y(line.StartPoint.y)
        self.enlarge_y(line.EndPoint.y)

    def enlarge_circle(self, circle):
        self.enlarge_x(circle.Center.x - circle.Radius)
        self.enlarge_x(circle.Center.x + circle.Radius)
        self.enlarge_y(circle.Center.y - circle.Radius)
        self.enlarge_y(circle.Center.y + circle.Radius)

    def enlarge_arc_of_circle(self, arc):
        # TODO: correctly compute the arc extrema (cf. toShape().BoundBox)
        self.enlarge_x(arc.Center.x)
        self.enlarge_y(arc.Center.y)


def get_sketch_dims(sketch):
    bbox = BoundingBox()
    for geom in sketch.Geometry:
        if isinstance(geom, Base.Vector):
            bbox.enlarge_point(geom)
        elif isinstance(geom, (Part.Line, Part.LineSegment)):
            bbox.enlarge_line(geom)
        elif isinstance(geom, Part.Circle):
            bbox.enlarge_circle(geom)
        elif isinstance(geom, Part.ArcOfCircle):
            bbox.enlarge_arc_of_circle(geom)
    if None in (bbox.xmin, bbox.ymin):
        dprint('sketch bbox not found')
        return 0, 0
    else:
        dprint('sketch bbox found')
        return bbox.xmax - bbox.xmin, bbox.ymax - bbox.ymin


def add_noise(point, sigma):
    """Add a Gaussian noise with standard deviation sigma"""
    dprint('  x0:{:>9.3f}  y0:{:>9.3f}', point.x, point.y)
    point.x = gauss(point.x, sigma)
    point.y = gauss(point.y, sigma)
    dprint('  xt:{:>9.3f}  yt:{:>9.3f}', point.x, point.y)


def move_points(sketch, geom_index, sigma):
    point_indexes = g_geom_points.get(type(sketch.Geometry[i]), [])
    # Direct access to sketch.Geometry[index] does not work. This would,
    # however prevent repeated recompute.
    # not checked validity of comment for v1.2
    moved = False
    for point_index in point_indexes:
        dprint('---- geo idx [{:>3} ] -- pt idx [{:>3} ] ----',
               geom_index, point_index)
        point = sketch.getPoint(geom_index, point_index)
        add_noise(point, sigma)
        try:
            sketch.movePoint(geom_index, point_index, point)
        except ValueError as e:
            dprint(repr(e))
        new_pos = sketch.getPoint(geom_index, point_index)
        test = point.isEqual(new_pos, 0)
        dprint('  did it move? {}', test)
        if test: moved = True
    return moved

def toggle_constraints(sketch, toggle):
    for cid in toggle:
        sketch.toggleVirtualSpace(cid)
    

view_provider = Gui.activeDocument().getInEdit()

shake_it = False
if not view_provider:
    msg = 'A sketch needs to be in edit to be shaken.'
    print(msg)
    _ = QMessageBox.information(None, __title__, msg)
else:
    sketch = view_provider.Object
    if sketch.TypeId == 'Sketcher::SketchObject':
        sketch.recompute() # ensure update
        to_virtual = [cid for cid, cts in enumerate(sketch.Constraints)
                      if cts.InVirtualSpace]
        sketch_span = get_sketch_dims(sketch)
        sigma = max(sketch_span) * displacement_amplitude
        dprint('sketch span: dx:{:>9.3f} dy:{:>9.3f}', *sketch_span)
        dprint('sigma for gauss-dist: {:.3f}', sigma)
        toggle_constraints(sketch, to_virtual)
        msg = ('Shake sketch will deform the loose parts of the sketch.\n'
               'The deformation can be restored with : \n'
               'the Undo (Ctrl+Z) and Redo (Ctrl+Y) button (labeled "Shake Sketch").\n'
               'If that is not desired, click Cancel,\n'
               'and run the macro on a copy of the sketch.\n\n'
               'Visibility of constraints has been toggled.\n'
               'Visibility of constraints is restored'
               ' after shaking the sketch.')
        reply = QMessageBox.information(None, 'Running Macro ' + __title__ + ' ver: ' + __version__, msg,
                                        QMessageBox.Ok | QMessageBox.Cancel,
                                        QMessageBox.Ok)
        shake_it = reply == QMessageBox.Ok
        
        if not shake_it:
            toggle_constraints(sketch, to_virtual)

if shake_it:
    nbr_moves = 0
    for i in range(sketch.GeometryCount):
        did_move = move_points(sketch, i, sigma)
        if did_move:
            nbr_moves += 1

    msg = 'Did {} moves. Sketch has a total of {} geometry entities.\n\n'
    msg = msg.format(nbr_moves, sketch.GeometryCount)
    open_verts = sketch.OpenVertices
    if open_verts:
        if len(open_verts) == 1:
            ov, form = 'one', 'vertex'
        else:
            ov, form = len(open_verts), 'vertices'
        msg += 'Sketch has {} open {}.'.format(ov, form)
        msg += ('\nA sketch with open vertices'
                ' cannot be used to create a solid.')
    else:
        msg += 'Sketch is free from open vertices.'

    msg += ('\n\nMenu: "Sketch/Validate Sketch..." can be used\n'
            'for additional info about sketch status.')
    
    _ = QMessageBox.information(None, 'Running Macro ' + __title__ + ' ver: ' + __version__, msg)
    toggle_constraints(sketch, to_virtual)
        

print('Macro finished.')