def _area_polygon(beam_poly,det_poly,sam_poly,plot=False,fig=None):
"""
Compute areas for polgon sample
Parameters:
-----------
* beam_pol is the beam polygon
* det_poly is the detector polygon
if det_poly = None, then just compute the beam and
sample overlap ie A_int/A_beam = spill fraction
"""
if plot:
if fig != None: pyplot.figure(fig)
pyplot.clf()
A_beam = poly_area(beam_poly)
if sam_poly == None:
inner_poly = beam_poly
else:
inner_poly = inner_polygon(beam_poly,sam_poly)
if det_poly != None:
inner_poly = inner_polygon(inner_poly,det_poly)
A_int = poly_area(inner_poly)
# make plots
if plot:
plot_polygon(beam_poly,fmt='ro-',label='Beam')
if sam_poly != None:
plot_polygon(sam_poly,fmt='bo-',label='Sample')
if det_poly != None:
plot_polygon(det_poly,fmt='ko-',label='Detector')
plot_points(inner_poly,fmt='go-')
plot_polygon(inner_poly,fmt='g--',linewidth=4,label='Intersection')
pyplot.xlabel('Xs')
pyplot.ylabel('Ys')
ll = round(num.sqrt(100.*A_int))
pyplot.xlim(-ll,ll)
pyplot.ylim(-ll,ll)
pyplot.grid()
pyplot.legend()
return (A_beam,A_int)
import matplotlib.cm as cm
fig, ax = plt.subplots(1)
xres, yres = 320, 240
img, img_ = get_rgb_image(xres, yres)
point = [(0., 0.), (-1., 0.), (-1., -1.)]
import math
scale = 30
center = xres/2, yres/2
for i in xrange(15):
pts = [(int(center[0] + p[0]*scale),
int(center[1] + p[1]*scale)) for p in point]
draw_polygon(img, pts, [i*10, 20+i*15, 50 + i*10])
plot_polygon(ax, pts, 'w')
x, y = point[2]
norm = math.sqrt(x*x + y*y)
new_point = (x + -y/norm, y + x/norm) # orthogonal to x,y ,
point[1] = point[2]
point[2] = new_point
ax.imshow(img, cm.gray, interpolation='nearest')
plt_show()
import json
import polygon
import matplotlib.patches
import matplotlib.pyplot as plt
def get_vertices(poly):
return polygon.get_vertices(poly['nsides'], poly['radius'], poly['center'],
poly['start_angle'])
if __name__ == '__main__':
#polys = [{'nsides': 6, 'radius' : 3.0, 'center': (0.0, 0.0), 'start_angle': 30},
# {'nsides': 4, 'radius' : 1.0, 'center': (1.0, 1.0), 'start_angle': 0}
#]
path = 'polygons.json'
with open(path) as fhandle:
jsonpolys = json.load(fhandle)
polys = jsonpolys['polygons']
fig, ax = plt.subplots()
for poly in polys:
x, y = get_vertices(poly)
polygon.plot_polygon(ax, x, y)
ax.autoscale()
ax.set_aspect('equal')
plt.show()
from polygon import draw_polygon, plot_polygon import matplotlib.pyplot as plt import matplotlib.cm as cm fig, ax = plt.subplots(1) xres, yres = 160, 120 img = get_grayscale_image(xres, yres) poly1 = [(0, 0), (100, 0), (100, 50), (75, 75), (50, 50), (25, 75), (0, 50)] poly2 = [(0, 50), (25, 75), (50, 50), (75, 75), (100, 50), (100, 100), (0, 100)] plot_polygon(ax, poly1, 'y') plot_polygon(ax, poly2, 'w') draw_polygon(img, poly1, 200) draw_polygon(img, poly2, 100) ## issues. Either first or last scanline should have exactly one pixel poly3 = [(42, 22), (32, 32), (42, 42), (52, 32)] draw_polygon(img, poly3, 255) plot_polygon(ax, poly3, 'r') poly4 = [(10, 10), (30, 10), (30, 20), (20, 20), (12, 18)] draw_polygon(img, poly4, 255) plot_polygon(ax, poly4, 'g')
