forked from platypush/platypush
Added route to dynamically generate logo.svg.
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D90FBA7F76362774
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from dataclasses import dataclass
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import math
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from typing import Tuple
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from flask import Blueprint, make_response, request
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logo = Blueprint('logo', __name__)
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# Declare routes list
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__routes__ = [
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logo,
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]
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@dataclass
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class Gear:
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"""
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A utility class used to model the gears in the application's logo.
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"""
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center: Tuple[float, float]
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outer_radius: float
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inner_radius: float
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color: str = "currentColor"
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background: str = ""
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num_spikes: int = 0
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spike_max_base: float = 0
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spike_min_base: float = 0
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spike_height: float = 0
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alpha_offset: float = 0
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def to_svg(self) -> str:
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"""
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Returns the SVG representation of a gear.
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"""
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# Generate the basic circle
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svg = f"""
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<circle
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cx="{self.center[0]}" cy="{self.center[1]}"
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r="{self.outer_radius - (self.inner_radius / math.pi)}"
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stroke-width="{self.inner_radius}"
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stroke="{self.color}"
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fill="none" />
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"""
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# Generate the spikes
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for i in range(self.num_spikes):
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# Iterate for alpha -> [0, 2*pi]
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alpha = (2 * math.pi * i) / self.num_spikes
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# Calculate the base angle for the major base of the gear polygon
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maj_delta_alpha = math.asin(self.spike_max_base / (2 * self.outer_radius))
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# Calculate the points of the gear polygon's major base
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maj_base = (
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(
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self.center[0]
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+ self.outer_radius
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* math.cos(alpha + maj_delta_alpha + self.alpha_offset),
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self.center[1]
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+ self.outer_radius
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* math.sin(alpha + maj_delta_alpha + self.alpha_offset),
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),
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(
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self.center[0]
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+ self.outer_radius
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* math.cos(alpha - maj_delta_alpha + self.alpha_offset),
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self.center[1]
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+ self.outer_radius
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* math.sin(alpha - maj_delta_alpha + self.alpha_offset),
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),
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)
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# Height of the gear relative to the circle's center
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h = self.outer_radius * math.cos(maj_delta_alpha) + self.spike_height
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# Calculate the base angle for the minor base of the gear polygon
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min_delta_alpha = math.asin(self.spike_min_base / (2 * h))
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# Calculate the points of the gear polygon's minor base
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min_base = (
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(
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self.center[0]
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+ h * math.cos(alpha - min_delta_alpha + self.alpha_offset),
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self.center[1]
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+ h * math.sin(alpha - min_delta_alpha + self.alpha_offset),
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),
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(
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self.center[0]
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+ h * math.cos(alpha + min_delta_alpha + self.alpha_offset),
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self.center[1]
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+ h * math.sin(alpha + min_delta_alpha + self.alpha_offset),
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),
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)
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# Flatten the polygon's points
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svg_points = " ".join(
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[f"{point[0]},{point[1]}" for point in [*maj_base, *min_base]]
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)
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# Serialize the gear polygon to SVG
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svg += f"""
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<polygon points="{svg_points}" stroke="{self.color}" fill="{self.color}" />"""
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return svg
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# Properties of the two gears on the logo
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gears = [
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Gear(
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center=(32.9, 34.5),
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outer_radius=22.6,
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inner_radius=12.4,
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num_spikes=12,
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spike_max_base=9,
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spike_min_base=4.3,
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spike_height=10.16,
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),
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Gear(
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center=(65.5, 70.5),
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outer_radius=14.4,
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inner_radius=8.5,
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num_spikes=7,
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spike_max_base=9,
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spike_min_base=4.3,
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spike_height=7.5,
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alpha_offset=math.pi / 6.6,
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),
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]
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template_start = """
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<?xml version="1.0" standalone="no"?>
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<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN"
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"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
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<svg version="1.1"
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width="{width}" height="{height}"
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viewBox="0 0 100 100"
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preserveAspectRatio="none"
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xmlns="http://www.w3.org/2000/svg">
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<defs>
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<linearGradient id="triangleGradient">
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<stop offset="0%" stop-color="#8acb45" />
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<stop offset="50%" stop-color="#6bbb4c" />
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<stop offset="100%" stop-color="#5cb450" />
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</linearGradient>
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</defs>
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<rect width="100%" height="100%" fill="{bg_color}" />
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"""
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template_end = "\n</svg>"
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@logo.route('/logo.svg', methods=['GET'])
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def logo_path():
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"""
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This path dynamically generates the logo image as a parametrizable vector SVG.
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Parameters:
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- ``size``: Size of the image in pixels (default: 256)
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- ``bg``: Background color (default: "none")
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- ``fg``: Foreground color (default: "currentColor")
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"""
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size = request.args.get("size", 256)
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bg = request.args.get("bg", "none")
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fg = request.args.get("fg", "currentColor")
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svg = template_start.format(
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width=size,
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height=size,
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bg_color=bg,
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)
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for gear in gears:
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gear.color = fg
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gear.background = bg
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svg += gear.to_svg()
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# "Play" triangle on the logo
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svg += """\n\t\t<polygon points="67,47 67,3 99,25.3" fill="url(#triangleGradient)" />"""
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svg += template_end
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rs = make_response(svg)
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rs.headers.update({"Content-Type": "image/svg+xml"})
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return rs
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# vim:sw=4:ts=4:et:
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<?xml version="1.0" standalone="no"?>
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<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN"
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"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
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<svg version="1.1"
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width="256" height="256"
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viewBox="0 0 100 100"
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preserveAspectRatio="none"
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xmlns="http://www.w3.org/2000/svg">
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<defs>
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<linearGradient id="triangleGradient">
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<stop offset="0%" stop-color="#8acb45" />
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<stop offset="50%" stop-color="#6bbb4c" />
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<stop offset="100%" stop-color="#5cb450" />
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</linearGradient>
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</defs>
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<rect width="100%" height="100%" fill="none" />
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<circle cx="32.9" cy="34.5" r="18.652957411320997" stroke-width="12.4" stroke="#000000" fill="none" />
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<polygon points="55.047460351019936,39.0 55.047460351019936,30.0 65.13584176553678,32.35 65.13584176553678,36.65" stroke="#000000" fill="#000000" />
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<polygon points="49.830263293291885,49.47084449253994 54.330263293291885,41.67661585847999 61.89205788133026,48.755966264631844 59.742057881330254,52.479875500904924" stroke="#000000" fill="#000000" />
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<polygon points="40.07661585848,55.93026329329189 47.870844492539945,51.43026329329188 50.87987550090493,61.342057881330255 47.15596626463184,63.492057881330254" stroke="#000000" fill="#000000" />
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<polygon points="28.4,56.64746035101994 37.4,56.64746035101993 35.050000000000004,66.73584176553678 30.75,66.73584176553678" stroke="#000000" fill="#000000" />
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<polygon points="17.92915550746006,51.43026329329189 25.72338414152001,55.93026329329189 18.644033735368154,63.492057881330254 14.920124499095078,61.34205788133026" stroke="#000000" fill="#000000" />
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<polygon points="11.469736706708115,41.67661585847999 15.969736706708115,49.47084449253994 6.0579421186697395,52.479875500904924 3.9079421186697445,48.75596626463185" stroke="#000000" fill="#000000" />
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<polygon points="10.752539648980061,30.000000000000004 10.752539648980065,39.0 0.6641582344632226,36.65 0.6641582344632226,32.35000000000001" stroke="#000000" fill="#000000" />
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<polygon points="15.969736706708108,19.52915550746006 11.469736706708112,27.323384141520012 3.907942118669741,20.24403373536816 6.057942118669736,16.520124499095083" stroke="#000000" fill="#000000" />
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<polygon points="25.723384141519993,13.06973670670812 17.92915550746005,17.569736706708124 14.92012449909506,7.657942118669752 18.644033735368136,5.507942118669753" stroke="#000000" fill="#000000" />
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<polygon points="37.39999999999999,12.352539648980063 28.399999999999995,12.352539648980066 30.749999999999996,2.264158234463224 35.04999999999999,2.264158234463224" stroke="#000000" fill="#000000" />
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<polygon points="47.870844492539945,17.569736706708117 40.07661585848,13.069736706708117 47.15596626463185,5.507942118669746 50.87987550090493,7.6579421186697445" stroke="#000000" fill="#000000" />
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<polygon points="54.33026329329188,27.323384141519995 49.83026329329188,19.52915550746005 59.74205788133025,16.52012449909506 61.892057881330246,20.244033735368134" stroke="#000000" fill="#000000" />
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<circle cx="65.5" cy="70.5" r="11.69436596743778" stroke-width="8.5" stroke="#000000" fill="none" />
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<polygon points="75.59619697596976,80.76775567601894 79.72023567151646,72.76823663812462 85.21241914871936,78.24356296406287 83.2420451052915,82.06555539327904" stroke="#000000" fill="#000000" />
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<polygon points="63.76722121027272,84.79536560098661 72.59279310784501,83.03205034817951 71.73633099741353,90.73982242421863 67.51966886857343,91.58229526722646" stroke="#000000" fill="#000000" />
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<polygon points="53.24306321548609,78.05827365609566 60.1243326673541,83.85897453881562 53.56415840708632,87.99508278180117 50.276440780082716,85.22363680450164" stroke="#000000" fill="#000000" />
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<polygon points="51.94862861538407,65.62964748747973 51.70385937197527,74.62631842830451 44.379917983020505,72.07618897003609 44.49686328820471,67.7777795205309" stroke="#000000" fill="#000000" />
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<polygon points="60.85865306549732,56.86849609787744 53.67216135948117,62.28646037972363 51.09953008890019,54.970392715438265 54.53307612621901,52.381809780778426" stroke="#000000" fill="#000000" />
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<polygon points="73.2637064235145,58.37214517857838 64.54706708723641,56.131565190885546 68.66298975389094,49.55870749237323 72.82760632566824,50.62920681982647" stroke="#000000" fill="#000000" />
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<polygon points="79.82253049387555,69.00831630296325 76.13955073459155,60.796394475966565 83.84465362096915,59.916242652069755 85.60429950596037,63.83971641385705" stroke="#000000" fill="#000000" />
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<polygon points="67,47 67,3 99,25.3" fill="url(#triangleGradient)" />
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</svg>
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