FabLab_Chemnitz/mightyscape-1.2
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add start angle to spiral

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vmario
2025-12-17 12:07:25 +01:00
parent 91ff3c199a
commit 6a8793e808
2 changed files with 7 additions and 5 deletions
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extensions/fablabchemnitz/archimedes_spiral/archimedes_spiral.inx
+1
View File
@@ -5,6 +5,7 @@
<param name="tab" type="notebook">
<page name="tab_settings" gui-text="Settings">
<label appearance="header">R = r + aθ</label>
<param name="th" type="float" min="0.00" max="360.00" gui-text="angle (°)" gui-description="The starting angle">0</param>
<param name="r" type="int" min="0" max="1000000" gui-text="r (mm)">50</param>
<param name="a" type="float" min="0" max="1000000" gui-text="a">3</param>
<param name="step" type="int" min="1" max="300" gui-text="Step" gui-description="The higher the value the better the accuracy. If you set the step value really low the resulting length will not be precise and the curve is maybe not drawn at all">50</param>
extensions/fablabchemnitz/archimedes_spiral/archimedes_spiral.py
+6 -5
View File
@@ -21,6 +21,7 @@ class Archimedes(inkex.EffectExtension):
def add_arguments(self, pars):
pars.add_argument('--tab')
pars.add_argument('--th', type = float, default = '0')
pars.add_argument('--r', type = int, default = '50')
pars.add_argument('--a', type = float, default = '3')
pars.add_argument('--step', type = int, default = '50')
@@ -29,7 +30,8 @@ class Archimedes(inkex.EffectExtension):
pars.add_argument('--length', type = float, default = '500')
def effect(self):
th = pi / 3
#th = pi / 1
th = self.options.th / 360 * pi * 2
a = self.options.a
r = self.options.r
@@ -46,14 +48,13 @@ class Archimedes(inkex.EffectExtension):
layer = etree.SubElement(self.document.getroot(),'g')
path = etree.Element(inkex.addNS('path','svg'))
path.set('d', self.built(r, step, a, turns))
path.set('d', self.built(r, step, a, turns, th))
path.set('style',"fill:none;stroke:#000000;stroke-width:1px;stroke-opacity:1")
layer.append(path)
def built(self, r0, st = 4, a = 4, k = 1, th = 0):
def built(self, r0, st, a, k, th):
step = 2 * pi / st
r = r0
s = "M " + str(r * cos(th)) + ", " + str(-r * sin(th))
s = "M " + str(r0 * cos(th)) + ", " + str(-r0 * sin(th))
for i in range(0, int(k * (abs(st)))):
prin = th + i * step
meta = th + (i + 1) * step