FreeCAD workbench to create assembly handbooks
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import FreeCAD as App
import FreeCADGui as Gui
class RasterView:
def __init__(self, view):
self.source_view = view
doc = view.Document
self.image_file_name = doc.FileName.replace('.FCStd', '') + '_raster/' + view.Name + '.png'
def init_image_projection(self):
doc = self.source_view.Document
image_name = self.source_view.Label + "_raster"
image = doc.getObject(image_name)
if image is None:
return False
self.image_view = image
if image.Assembly_handbook_ViewVolumeWidth > 0:
self._precompute_image_projection()
return True
return False
def init_image(self):
workbench = Gui.getWorkbench("AssemblyHandbookWorkbench") #: :type workbench: AssemblyHandbookWorkbench
doc = self.source_view.Document
page = workbench.techDrawExtensions.getViewPage(self.source_view)
image_name = self.source_view.Label + "_raster"
image = doc.getObject(image_name)
if image is None:
image = doc.addObject('TechDraw::DrawViewImage', image_name)
image.addProperty("App::PropertyFloat", "Assembly_handbook_ViewVolumeWidth", "Assembly_handbook")
image.addProperty("App::PropertyFloat", "Assembly_handbook_ViewVolumeHeight", "Assembly_handbook")
image.addProperty("App::PropertyFloat", "Assembly_handbook_ViewVolumeDepth", "Assembly_handbook")
image.addProperty("App::PropertyVector", "Assembly_handbook_ViewVolumeOffset", "Assembly_handbook")
if not image in page.Views:
page.addView(image)
new_views_list = page.Views
new_views_list.remove(image)
view_idx = new_views_list.index(self.source_view)
new_views_list.insert(view_idx, image)
page.Views = new_views_list
self.image_view = image
if image.Assembly_handbook_ViewVolumeWidth > 0:
self._precompute_image_projection()
def _precompute_image_projection(self):
YDirection = self.source_view.Direction.cross(self.source_view.XDirection)
self.image_x_dir = self.source_view.XDirection / self.image_view.Assembly_handbook_ViewVolumeWidth
self.image_y_dir = YDirection / self.image_view.Assembly_handbook_ViewVolumeHeight
self.image_z_dir = self.source_view.Direction / self.image_view.Assembly_handbook_ViewVolumeDepth
self.image_x_dir_inv = self.source_view.XDirection * self.image_view.Assembly_handbook_ViewVolumeWidth
self.image_y_dir_inv = YDirection * self.image_view.Assembly_handbook_ViewVolumeHeight
self.image_z_dir_inv = self.source_view.Direction * self.image_view.Assembly_handbook_ViewVolumeDepth
def project3DPointToImageView(self, point3d):
offset = self.image_view.Assembly_handbook_ViewVolumeOffset
return App.Vector(self.image_x_dir.dot(point3d) + offset.x, self.image_y_dir.dot(point3d) + offset.y, self.image_z_dir.dot(point3d) + offset.z)
def project3DPointToSourceView(self, point3d):
offset = self.image_view.Assembly_handbook_ViewVolumeOffset
offset = App.Vector((offset.x-0.5) * self.image_view.Assembly_handbook_ViewVolumeWidth, (offset.y-0.5) * self.image_view.Assembly_handbook_ViewVolumeHeight, (offset.z-0.5) * self.image_view.Assembly_handbook_ViewVolumeDepth)
#image_view_point = App.Vector(self.image_x_dir.dot(point3d), self.image_y_dir.dot(point3d), self.image_z_dir.dot(point3d))
#return App.Vector(image_view_point.x * self.image_view.Assembly_handbook_ViewVolumeWidth, image_view_point.y * self.image_view.Assembly_handbook_ViewVolumeHeight, 0)
YDirection = self.source_view.Direction.cross(self.source_view.XDirection)
return App.Vector(self.source_view.XDirection.dot(point3d) + offset.x, YDirection.dot(point3d) + offset.y, self.image_z_dir.dot(point3d) + offset.z)
def projectImageViewPointTo3D(self, point2d):
offset = self.image_view.Assembly_handbook_ViewVolumeOffset
p = point2d - offset
return self.image_x_dir_inv * p.x + self.image_y_dir_inv * p.y + self.image_z_dir_inv * p.z
def _flatten_objects_tree(self, obj_list):
result = []
for obj in obj_list:
if obj.TypeId == 'Part::FeaturePython' and hasattr(obj, 'LinkedObject'): # variant link
result.extend(self._flatten_objects_tree(obj.Group))
elif obj.TypeId in ['App::Link']:
result.extend(self._flatten_objects_tree([obj.LinkedObject]))
elif obj.TypeId in ['App::Part', 'App::DocumentObjectGroup']:
result.extend(self._flatten_objects_tree(obj.Group))
elif obj.TypeId in ['Part::Feature', 'Part::FeaturePython', 'PartDesign::Body', 'PartDesign::CoordinateSystem', 'PartDesign::Line', 'Part::Mirroring', 'Part::Cut']:
result.append(obj)
if hasattr(obj, 'Group'):
result.extend(self._flatten_objects_tree(obj.Group))
return result
def _should_render(self, obj):
return obj.TypeId in ['Part::Feature', 'Part::FeaturePython', 'PartDesign::Body', 'Part::Mirroring', 'Part::Cut']
def render(self):
from pivy import coin
import os
from PIL import Image, ImageDraw, ImageChops
workbench = Gui.getWorkbench("AssemblyHandbookWorkbench") #: :type workbench: AssemblyHandbookWorkbench
view = self.source_view
self.init_image()
print('Rasterizing ' + view.Label + " to " + self.image_file_name + "...")
dir = os.path.dirname(self.image_file_name)
if not os.path.exists(dir):
os.makedirs(dir)
doc = App.newDocument('tmp_raster', hidden=False, temp=False)
objects_to_reset = {}
try:
for part in view.XSource:
link = doc.addObject('App::Link', part.Name)
link.Label = part.Label
if part.TypeId == 'App::Link':
link.LinkedObject = part.LinkedObject
link.Placement = part.Placement
elif part.TypeId == 'Part::FeaturePython' and hasattr(part, 'LinkedObject'): # variant link
link.LinkedObject = part.LinkedObject
link.Placement = part.Placement
else:
link.LinkedObject = part
new_part = workbench.techDrawExtensions.isNewPartInView(view, part)
link.ViewObject.OverrideMaterial = True
link.ViewObject.ShapeMaterial.DiffuseColor = (0.0, 0.0, 0.0, 0.0) if new_part else (0.5, 0.5, 0.5, 0.0) # this actually changes the line color
# in current version of freecad, link override material does not allow to override all material properties, for example emissive color, so we have to change material of the linked object
for obj in self._flatten_objects_tree([link]):
if obj in objects_to_reset.keys():
continue
if self._should_render(obj):
objects_to_reset[obj] = (
obj.ViewObject.LineColor,
obj.ViewObject.ShapeMaterial.AmbientColor,
obj.ViewObject.ShapeMaterial.DiffuseColor,
obj.ViewObject.ShapeMaterial.SpecularColor,
obj.ViewObject.ShapeMaterial.EmissiveColor,
obj.ViewObject.LineWidth
)
obj.ViewObject.LineColor = (0.0, 0.0, 0.0, 0.0)
obj.ViewObject.ShapeMaterial.AmbientColor = (0.0, 0.0, 0.0, 0.0)
obj.ViewObject.ShapeMaterial.DiffuseColor = (0.0, 0.0, 0.0, 0.0)
obj.ViewObject.ShapeMaterial.SpecularColor = (0.0, 0.0, 0.0, 0.0)
obj.ViewObject.ShapeMaterial.EmissiveColor = (1.0, 1.0, 1.0, 0.0)
# We need to set two different values otherwise freecad does not always update LineWidth of sub-elements
obj.ViewObject.LineWidth = 1.0
obj.ViewObject.LineWidth = 2.0
else:
objects_to_reset[obj] = (
obj.ViewObject.Visibility,
)
obj.ViewObject.Visibility = False
docView = Gui.getDocument(doc.Name).mdiViewsOfType('Gui::View3DInventor')[0]
cam = docView.getCameraNode()
rot = coin.SbRotation(coin.SbVec3f(1,0,0), coin.SbVec3f(view.XDirection.x,view.XDirection.y,view.XDirection.z))
rot *= coin.SbRotation(coin.SbVec3f(0,0,1), coin.SbVec3f(view.Direction.x,view.Direction.y,view.Direction.z))
cam.orientation.setValue(rot)
docView.fitAll()
viewVolume = cam.getViewVolume(0.0)
self.image_view.Assembly_handbook_ViewVolumeWidth = viewVolume.getWidth()
self.image_view.Assembly_handbook_ViewVolumeHeight = viewVolume.getHeight()
self.image_view.Assembly_handbook_ViewVolumeDepth = viewVolume.getDepth()
docView.saveImage(self.image_file_name, 4096, 4096, "#ffffff")
finally:
for obj, props in objects_to_reset.items():
if self._should_render(obj):
obj.ViewObject.LineColor = props[0]
obj.ViewObject.ShapeMaterial.AmbientColor = props[1]
obj.ViewObject.ShapeMaterial.DiffuseColor = props[2]
obj.ViewObject.ShapeMaterial.SpecularColor = props[3]
obj.ViewObject.ShapeMaterial.EmissiveColor = props[4]
obj.ViewObject.LineWidth = props[5]
else:
obj.ViewObject.Visibility = props[0]
with Image.open(self.image_file_name) as img:
original_size = img.size
bg = Image.new(img.mode, img.size, '#ffffff') # fills an image with the background color
diff = ImageChops.difference(img, bg) # diff between the actual image and the background color
bbox = diff.getbbox() # finds border size (non-black portion of the image)
#print(bbox)
#image_center = (bbox[0] + (bbox[2] - bbox[0])/2 - img.size[0]/2, bbox[1] + (bbox[3] - bbox[1])/2 - img.size[1]/2)
#print(image_center)
img = img.crop(bbox)
draw = ImageDraw.Draw(img)
def debugPoint(p3d):
p2d = self.project3DPointToImageView(p3d)
pp = App.Vector(p2d.x * original_size[0] - bbox[0], (1.0-p2d.y) * original_size[1] - bbox[1])
#print('pp', pp)
len = 100
draw.line([(pp.x, pp.y-len), (pp.x, pp.y+len)], fill=128, width = 7)
draw.line([(pp.x-len, pp.y), (pp.x+len, pp.y)], fill=128, width = 7)
#debugPoint(App.Vector(-12.5, 37.5, 25.0))
#debugPoint(App.Vector(-12.5, -1387.5, 25.0))
#debugPoint(App.Vector(131.23702882966705, -655.0000021095163, 145.21130178331268))
img.save(self.image_file_name)
sb_offset = viewVolume.projectToScreen(coin.SbVec3f(0,0,0))
crop_offset = App.Vector(((bbox[0] + bbox[2])/2 - original_size[0]/2)/original_size[0], ((bbox[1] + bbox[3])/2 - original_size[1]/2)/original_size[1], 0)
self.image_view.Assembly_handbook_ViewVolumeOffset = App.Vector(sb_offset[0] - crop_offset.x, sb_offset[1] + crop_offset.y, sb_offset[2])
self._precompute_image_projection()
p2dA = self.project3DPointToImageView(App.Vector(0,0,0))
p2dB = self.project3DPointToImageView(view.XDirection)
imageScale = view.Scale / (p2dB.x - p2dA.x) / original_size[0] * 10
#print('imageScale', imageScale)
App.closeDocument(doc.Name)
image = self.image_view
image.ImageFile = ""
image.Scale = imageScale
image.X = view.X
image.Y = view.Y
image.ImageFile = self.image_file_name # TODO: see if it's possible to set a relative path
image.recompute()