/
flag_utils.py
150 lines (115 loc) · 3.04 KB
/
flag_utils.py
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"""
This is a set of tools and weird hacks to get
./flag.py to work and closely resemble ./flag.ps.
Here, we define functions that match some of the
PostScript operators (moveto, rectfill, setcolor, etc.).
ISSUES:
- ps bg color white?
- 'lw' in PathPatch are wrong units?
- subclassing 'matplotlib.transforms.Affine2D'
lead to some weird problems.
"""
import matplotlib.pyplot as plt
from matplotlib.path import Path
import matplotlib.patches as patches
import matplotlib.transforms
import math
class Writer:
def __init__(self):
self.width = 720
self.height = 480
dpi = 100 #?
self.dpi = dpi
self.fig = plt.figure(figsize=(self.width/dpi,
self.height/dpi),
dpi=dpi)
self.ax = self.fig.add_axes((0,0,1,1))
self.reset()
def reset(self):
self.x = 0
self.y = 0
#path data:
self.vertices = []
self.codes = []
#store
self.rotation_rad = 0
self.tx = 0
self.ty = 0
#global holds state of drawer
wr = Writer()
#def tr(pt):
# return wr.transform(pt)
def moveto(x,y):
"""
"""
t = matplotlib.transforms.Affine2D()
t.rotate(wr.rotation_rad)
t.translate(wr.tx, wr.ty)
xx,yy = t.transform_point((x,y))
wr.x = xx
wr.y = yy
wr.vertices.append((wr.x, wr.y))
wr.codes.append(Path.MOVETO)
def rlineto(x,y):
#ugly? rlineto shouldn't
# include translation but should include rotation?
# zero-out translation entries:
#M = wr.transform.get_matrix().copy()
#M[:2,2] = 0
#wr0 = MyTransform(M)
#dx,dy = wr0((x,y))
tr = matplotlib.transforms.Affine2D()
tr.rotate(wr.rotation_rad)
dx,dy = tr.transform_point((x,y))
#relative:
wr.x += dx
wr.y += dy
wr.vertices.append((wr.x, wr.y))
wr.codes.append(Path.LINETO)
def setlinewidth(lw):
wr.linewidth = lw #default?
def setrgbcolor(r,g,b):
wr.rgb = (r,g,b) #default?
def translate(dx,dy):
wr.tx += dx
wr.ty += dy
def rotate(theta):
wr.rotation_rad += math.radians(theta)
def _add_patch(patch):
wr.ax.add_patch(patch)
wr.reset()
def fill():
path = Path(wr.vertices, wr.codes)
_add_patch(
patches.PathPatch(
path,
facecolor = wr.rgb,
edgecolor = 'none',
lw = 1,
))
def rectfill(x,y,width,height):
matplotlib.patches.Rectangle
_add_patch(
patches.Rectangle(
(x,y),
width,
height,
facecolor = wr.rgb,
edgecolor = 'none',
lw = 1,
))
def stroke():
"""
"""
path = Path(wr.vertices, wr.codes)
_add_patch(patches.PathPatch(
path,
facecolor = 'none',
edgecolor = wr.rgb,
lw = wr.linewidth,
))
def write_png(path, globals_):
wr.ax.set_xbound((0, globals_['width']))
wr.ax.set_ybound((0, globals_['height']))
wr.ax.figure.savefig(path,dpi=wr.dpi)
print("WROTE:", path)