def chunk_limit_setup():
N = 100_000
dpi = 500
w = 5 * dpi
h = 6 * dpi
# just fit in the width
x = np.linspace(0, w, N)
# and go top-to-bottom
y = np.ones(N) * h
y[::2] = 0
idt = IdentityTransform()
# make a renderer
ra = RendererAgg(w, h, dpi)
# setup the minimal gc to draw a line
gc = ra.new_gc()
gc.set_linewidth(1)
gc.set_foreground('r')
# make a Path
p = Path(np.vstack((x, y)).T)
# effectively disable path simplification (but leaving it "on")
p.simplify_threshold = 0
return ra, gc, p, idt
# working directly with renderer and graphics contexts primitives
from matplotlib.font_manager import FontProperties
from matplotlib.backends.backend_agg import RendererAgg
from matplotlib.transforms import Value
# a 400x400 canvas at 72dpi canvas
dpi = Value(72.0)
o = RendererAgg(400,400, dpi)
# the graphics context
gc = o.new_gc()
# draw the background white
gc.set_foreground('w')
face = (1,1,1) # white
o.draw_rectangle(gc, face, 0, 0, 400, 400)
# the gc's know about color strings, and can handle any matplotlib
# color arguments (hex strings, rgb, format strings, etc)
gc.set_foreground('g')
gc.set_linewidth(4)
face = (1,0,0) # must be rgb
o.draw_rectangle(gc, face, 10, 50, 100, 200)
# draw a translucent ellipse
rgb = (0,0,1)
gc.set_alpha(0.5)
o.draw_arc(gc, rgb, 100, 100, 100, 100, 360, 360, 0)
# draw a dashed line
gc.set_dashes(0, [5, 10])
# working directly with renderer and graphics contexts primitives
from matplotlib.font_manager import FontProperties
from matplotlib.backends.backend_agg import RendererAgg
from matplotlib.transforms import Value
# a 400x400 canvas at 72dpi canvas
dpi = Value(72.0)
o = RendererAgg(400, 400, dpi)
# the graphics context
gc = o.new_gc()
# draw the background white
gc.set_foreground('w')
face = (1, 1, 1) # white
o.draw_rectangle(gc, face, 0, 0, 400, 400)
# the gc's know about color strings, and can handle any matplotlib
# color arguments (hex strings, rgb, format strings, etc)
gc.set_foreground('g')
gc.set_linewidth(4)
face = (1, 0, 0) # must be rgb
o.draw_rectangle(gc, face, 10, 50, 100, 200)
# draw a translucent ellipse
rgb = (0, 0, 1)
gc.set_alpha(0.5)
o.draw_arc(gc, rgb, 100, 100, 100, 100, 360, 360, 0)
# draw a dashed line
gc.set_dashes(0, [5, 10])
