**在设计版图时往往需要加上公司或者学校的LOGO,只需要LOGO的图片，通过代码就可以将LOGO加到版图上，比如：

**
通过代码可以得到版图上的LOGO:
!
代码如下：

from si_fab import all as pdk
from ipkiss3 import all as i3i3.TECH.PURPOSE.DF.POLYGON = i3.TECH.PURPOSE.DRAWING
i3.TECH.PROCESS.HFW = i3.TECH.PURPOSE.UNUSEDPIL_loaded = False
try:from PIL import ImagePIL_loaded = True
except:passtry:import ImagePIL_loaded = True
except:passif not PIL_loaded:raise AssertionError(" PIL should be installed")class BitmapGrating(i3.PCell):image = i3.DefinitionProperty()pixel = i3.ChildCellProperty()class Layout(i3.LayoutView):pixel_pitch = i3.Size2Property(default=(2.0, 2.0))def _generate_instances(self, insts):im = self.imagew = im.size[0]h = im.size[1]pixels = im.getdata()period_x = self.pixel_pitch[0]period_y = self.pixel_pitch[1]for y in range(h):pen_down = Falsefor x in range(w):p = pixels[x + y * w]if not pen_down:if p == 0:pen_down = Truestart_x = xelif not p == 0:pen_down = Falsen_x = x - start_xif n_x > 1:insts += i3.ARef(reference=self.pixel,origin=(start_x * period_x, -y * period_y),period=(period_x, period_y),n_o_periods=(n_x, 1),)else:insts += i3.SRef(reference=self.pixel, position=(start_x * period_x, -y * period_y))if pen_down:n_x = x - start_x + 1if n_x > 1:insts += i3.ARef(reference=self.pixel,origin=(start_x * period_x, -y * period_y),period=(period_x, period_y),n_o_periods=(n_x, 1),)else:insts += i3.SRef(reference=self.pixel, position=(start_x * period_x, -y * period_y))return instsclass BitmapGratingFromFile(BitmapGrating):image = i3.LockedProperty()filename = i3.StringProperty()def _default_image(self):return Image.open(self.filename).convert("1")class SquareBitmapGrating(BitmapGrating):pixel = i3.ChildCellProperty(locked=True)def _default_pixel(self):from picazzo3.phc.generic.holes import RectHolereturn RectHole(name="{}_pixel".format(self.name))class Layout(BitmapGrating.Layout):pixel_size = i3.Size2Property(default=(1.0, 1.0))layer = i3.LayerProperty(default=i3.TECH.PPLAYER.WG.TEXT)def _default_pixel(self):lv = self.cell.pixel.get_default_view(i3.LayoutView)lv.set(radii=(0.5 * self.pixel_size[0], 0.5 * self.pixel_size[1]),process=self.layer.process,purpose=self.layer.purpose,)return lvclass SquareBitmapGratingFromFile(BitmapGratingFromFile, SquareBitmapGrating):"""Load a bitmap from file and convert it to a grating:SquareBitmapGratingFromFile(filename = "xxx", pixel_size = (x,y), pixel_pitch = (x,y))"""pass
if __name__ == '__main__':logo = SquareBitmapGratingFromFile(name="logo_fudan", filename="fudan.png")logo_layout = logo.Layout(pixel_size=(1.5, 1.5), pixel_pitch=(3.0, 3.0))logo_layout.visualize()