# Author: alexn11 (alexn11.gh@gmail.com)
# Copyright (C) 2020, Alexandre De Zotti
# License: MIT License
import math
import mathsvg
def a_function_with_one_parameter (t, r):
return (r * math.cos(2. * math.pi * t), r * math.sin(2. * math.pi * t))
image = mathsvg.SvgImage(pixel_density = 100, view_window = ((-1.1, -1.5), (2.5, 2.1)))
graph_function = lambda t : (math.sin(10 * math.pi * t) + 0.1, math.cos(6 * math.pi * t))
image.set_svg_options(stroke_color = "black")
image.draw_parametric_graph(graph_function, 0, 1, 40, curve_type = "autosmooth", is_closed = False)
image.set_svg_options(stroke_color = "blue")
image.draw_parametric_graph(graph_function, 0, 1, 40, curve_type = "polyline", is_closed = False)
graph_function = lambda t : (math.sin(6 * math.pi * t) + 1.1, math.cos(10 * math.pi * t))
image.set_svg_options(stroke_color = "red")
image.set_dash_mode("none")
image.draw_parametric_graph(graph_function, 0, 1, 400, curve_type = "polyline", is_closed = True)
image.set_svg_options(stroke_color = "black")
image.set_dash_mode("dot")
image.draw_parametric_graph(graph_function, 0, 1, 40, curve_type = "autosmooth", is_closed = True)
image.set_dash_mode("none")
image.reset_svg_options()
radius = .5
image.draw_parametric_graph(a_function_with_one_parameter, 0., 1., 22, radius, curve_type = "autosmooth", is_closed = True)
radius = .25
image.draw_parametric_graph(a_function_with_one_parameter, 0., 1., 22, radius, curve_type = "autosmooth", is_closed = True)
image.save("parametric-graphs.svg")
