test/skew.py at master · tzago/test · GitHub

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from matplotlib import pyplot
from shapely.wkt import loads as load_wkt
from shapely import affinity
from descartes.patch import PolygonPatch

#from figures import SIZE, BLUE, GRAY
GRAY='#858a8c'
BLUE='#00b4fc'

def add_origin(ax, geom, origin):
    x, y = xy = affinity.interpret_origin(geom, origin, 2)
    ax.plot(x, y, 'o', color=GRAY, zorder=1)
    ax.annotate(str(xy), xy=xy, ha='center',
                textcoords='offset points', xytext=(0, 8))

fig = pyplot.figure(1, dpi=90)

# Geometry from JTS TestBuilder with fixed precision model of 100.0
# Using CreateShape > FontGlyphSanSerif and A = triangle.wkt from scale.py
R = load_wkt('''\
POLYGON((2.218 2.204, 2.273 2.18, 2.328 2.144, 2.435 2.042, 2.541 1.895,
  2.647 1.702, 3 1, 2.626 1, 2.298 1.659, 2.235 1.777, 2.173 1.873,
  2.112 1.948, 2.051 2.001, 1.986 2.038, 1.91 2.064, 1.823 2.08, 1.726 2.085,
  1.347 2.085, 1.347 1, 1 1, 1 3.567, 1.784 3.567, 1.99 3.556, 2.168 3.521,
  2.319 3.464, 2.441 3.383, 2.492 3.334, 2.536 3.279, 2.604 3.152,
  2.644 3.002, 2.658 2.828, 2.651 2.712, 2.63 2.606, 2.594 2.51, 2.545 2.425,
  2.482 2.352, 2.407 2.29, 2.319 2.241, 2.218 2.204),
 (1.347 3.282, 1.347 2.371, 1.784 2.371, 1.902 2.378, 2.004 2.4, 2.091 2.436,
  2.163 2.487, 2.219 2.552, 2.259 2.63, 2.283 2.722, 2.291 2.828, 2.283 2.933,
  2.259 3.025, 2.219 3.103, 2.163 3.167, 2.091 3.217, 2.004 3.253, 1.902 3.275,
  1.784 3.282, 1.347 3.282))''')

xrange = [0, 5]
yrange = [0, 4]

# 1
ax = fig.add_subplot(121)

patch1a = PolygonPatch(R, facecolor=GRAY, edgecolor=GRAY,
                       alpha=0.5, zorder=1)
skewR = affinity.skew(R, xs=20, origin=(1, 1))
patch1b = PolygonPatch(skewR, facecolor=BLUE, edgecolor=BLUE,
                       alpha=0.5, zorder=2)
ax.add_patch(patch1a)
ax.add_patch(patch1b)

add_origin(ax, R, (1, 1))

ax.set_title("a) xs=20, origin(1, 1)")

ax.set_xlim(*xrange)
ax.set_xticks(range(*xrange) + [xrange[-1]])
ax.set_ylim(*yrange)
ax.set_yticks(range(*yrange) + [yrange[-1]])
ax.set_aspect(1)

# 2
ax = fig.add_subplot(122)

patch2a = PolygonPatch(R, facecolor=GRAY, edgecolor=GRAY,
                       alpha=0.5, zorder=1)
skewR = affinity.skew(R, ys=30)
patch2b = PolygonPatch(skewR, facecolor=BLUE, edgecolor=BLUE,
                       alpha=0.5, zorder=2)
ax.add_patch(patch2a)
ax.add_patch(patch2b)

add_origin(ax, R, 'center')

ax.set_title("b) ys=30")

ax.set_xlim(*xrange)
ax.set_xticks(range(*xrange) + [xrange[-1]])
ax.set_ylim(*yrange)
ax.set_yticks(range(*yrange) + [yrange[-1]])
ax.set_aspect(1)

pyplot.show()