auto_courtyard.py

# AW2018-12-06
# very simple auto-courtyard for KiCad footprints
# 1. reads bounding-box of F.fab and pads
# 2. expands by clearance
# 4. writes rectangle to F.CrtYd layer
# 5. writes modified footprint to a new file

import sys
import os
import math

import kicad_mod # https://github.com/KiCad/kicad-library-utils


import rules.klc_constants # https://github.com/KiCad/kicad-library-utils

if __name__ == "__main__":
    fname = "/home/anders/Desktop/kicad-footprints/Package_SO.pretty/Mini-Circuits_PL-094.kicad_mod"
    
    mod = kicad_mod.KicadMod(fname)
    
    # BB to contain pads and F.Fab
    box_all = kicad_mod.BoundingBox()
    bb = mod.geometricBoundingBox('F.Fab')
    bp = mod.overpadsBounds() 
    box_all.addBoundingBox(bb)
    box_all.addBoundingBox(bp)
    
    print "pads X", bp.xmin, bp.xmax
    print "pads Y", bp.ymin, bp.ymax
    
    print "fab X", bb.xmin, bb.xmax
    print "fab Y", bb.ymin, bb.ymax

    print "all X", box_all.xmin, box_all.xmax
    print "all Y", box_all.ymin, box_all.ymax
    
    # BB for Courtyard
    crt = kicad_mod.BoundingBox(box_all.xmin, box_all.ymin, box_all.xmax, box_all.ymax)
    
    # Clearance
    # needs to change depending on footprint...
    clearance = 0.25
    
    crt.expand(clearance)
    grid = rules.klc_constants.KLC_CRTYD_GRID
    # snap to grid
    gxmin, gxmax, gymin, gymax = round(crt.xmin/grid), round(crt.xmax/grid), round(crt.ymin/grid), round(crt.ymax/grid)
    # new, snapped Courtyard BB
    crt_grid = kicad_mod.BoundingBox( gxmin*grid, gymin*grid, gxmax*grid, gymax*grid )
    print "crt X", crt.xmin, crt.xmax
    print "crt Y", crt.ymin, crt.ymax
    print "gcrt X", crt_grid.xmin, crt_grid.xmax
    print "gcrt Y", crt_grid.ymin, crt_grid.ymax
    # add Rectangle to footprint
    mod.addRectangle( (crt_grid.xmin, crt_grid.ymin), (crt_grid.xmax, crt_grid.ymax), 'F.CrtYd', 0.05)
    
    # write to disk
    fname2 = fname[:-10]+"_AutoCrtYd.kicad_mod"
    mod.save(fname2)