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hobbyspline.py
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hobbyspline.py
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## Metapolator's Hobby Spline as Robofont plugin
## Contributors: Juraj Sukop, Lasse Fister, Simon Egli
import vanilla
from math import atan2, degrees, pi, sin, cos, radians
from defconAppKit.windows.baseWindow import BaseWindowController
from mojo.extensions import getExtensionDefault, setExtensionDefault
from cmath import e, sqrt
from mojo.UI import UpdateCurrentGlyphView
from mojo.glyphPreview import GlyphPreview
from mojo.events import addObserver, removeObserver
from MojoDrawingToolsPen import MojoDrawingToolsPen
from mojo.drawingTools import save, restore, stroke, fill, strokeWidth
from vanilla import *
extensionID = "com.metapolator"
def arg(x): # phase
return atan2(x.imag, x.real)
def hobby(theta, phi):
st, ct = sin(theta), cos(theta)
sp, cp = sin(phi), cos(phi)
return \
(2 + sqrt(2) * (st - 1/16*sp) * (sp - 1/16*st) * (ct - cp)) / \
(3 * (1 + 0.5*(sqrt(5) - 1) * ct + 0.5*(3 - sqrt(5)) * cp))
def controls(z0, w0, alpha, beta, w1, z1):
theta = arg(w0 / (z1 - z0))
phi = arg((z1 - z0) / w1)
u = z0 + e**(0+1j * theta) * (z1 - z0) * hobby(theta, phi) / alpha
v = z1 - e**(0-1j * phi) * (z1 - z0) * hobby(phi, theta) / beta
return u, v
class metapolator(BaseWindowController):
def __init__(self):
addObserver(self, "_curvePreview", "draw")
addObserver(self, "_curvePreview", "drawInactive")
addObserver(self, "_currentGlyphChanged", "currentGlyphChanged")
self.methods = {
0: "fl",
4: "free",
}
self.methodNames = [
"Tension:"
]
height = 80
self.w = vanilla.FloatingWindow((300, height), "Hobby's Spline")
y = -200
self.w.hobbyMethodSelector = vanilla.RadioGroup((10, y, -10, 108),
titles = "Circle",
callback=self._changeMethod,
sizeStyle="small"
)
y = 10
self.w.HobbySlider = Slider((15, y, -15, 25),
tickMarkCount=4,
callback=self._changetension,
minValue=0.5,
maxValue=1.0,
sizeStyle="small",
continuous=True
)
y = height - 32
self.w.hobbycurveButton = vanilla.Button((60, y , -60, 25), "transform selected curves",
callback=self._hobbycurve,
sizeStyle="small",
)
self.w.hobbyMethodSelector.set(getExtensionDefault("%s.%s" %(extensionID, "method"), 0))
self.method = self.methods[self.w.hobbyMethodSelector.get()]
self._checkSecondarySelectors()
self.w.HobbySlider.set(getExtensionDefault("%s.%s" %(extensionID, "tension"), 0.5))
self.tension = self.w.HobbySlider.get()
self.tmp_glyph = RGlyph()
UpdateCurrentGlyphView()
self.setUpBaseWindowBehavior()
self.w.open()
def _changeMethod(self, sender):
choice = sender.get()
self.method = self.methods[choice]
self._checkSecondarySelectors()
UpdateCurrentGlyphView()
def _changeCurvature(self, sender):
choice = sender.get()
self.curvature = self.curvatures[choice]
UpdateCurrentGlyphView()
def _changetension(self, sender):
self.tension = sender.get()
UpdateCurrentGlyphView()
def _currentGlyphChanged(self, sender):
UpdateCurrentGlyphView()
def _checkSecondarySelectors(self):
if self.method == "free":
self.w.HobbySlider.enable(True)
def _curvePreview(self, info):
_doodle_glyph = info["glyph"]
if _doodle_glyph is not None and len(_doodle_glyph.components) == 0 and _doodle_glyph.selection != []:
self.tmp_glyph.clear()
self.tmp_glyph.appendGlyph(_doodle_glyph)
self._hobbycurve()
pen = MojoDrawingToolsPen(self.tmp_glyph, _doodle_glyph.getParent())
save()
stroke(0, 0, 0, 0.5)
fill(1, 0, 0, 0.9)
strokeWidth(info["scale"])
self.tmp_glyph.draw(pen)
pen.draw()
restore()
UpdateCurrentGlyphView()
def spline(self, p0, p1, p2, p3, curvature=1.75):
delta0 = complex(p1.x, p1.y) - complex(p0.x, p0.y)
rad0 = atan2(delta0.real, delta0.imag)
w0 = complex(sin(rad0), cos(rad0))
delta1 = complex(p3.x, p3.y) - complex(p2.x, p2.y)
rad1 = atan2(delta1.real, delta1.imag)
w1 = complex(sin(rad1), cos(rad1))
alpha, beta = 1 * curvature, 1 * curvature
u, v = controls(complex(p0.x, p0.y), w0, alpha, beta, w1, complex(p3.x, p3.y))
p1.x, p1.y = u.real, u.imag
p2.x, p2.y = v.real, v.imag
return p1, p2
def _hobbycurve(self, sender=None):
reference_glyph = CurrentGlyph()
if reference_glyph.selection != []:
if sender is None:
modify_glyph = self.tmp_glyph
else:
modify_glyph = reference_glyph
reference_glyph.prepareUndo(undoTitle="spline /%s" % reference_glyph.name)
for contourIndex in range(len(reference_glyph.contours)):
reference_contour = reference_glyph.contours[contourIndex]
modify_contour = modify_glyph.contours[contourIndex]
for i in range(len(reference_contour.segments)):
reference_segment = reference_contour[i]
modify_segment = modify_contour[i]
if reference_segment.selected and reference_segment.type == "curve":
# last point of the previous segment
p0 = modify_contour[i-1][-1]
p1, p2, p3 = modify_segment.points
p1, p2 = self.spline(p0, p1, p2, p3, self.tension)
if sender is not None:
p1.round()
p2.round()
reference_glyph.update()
if sender is not None:
reference_glyph.performUndo()
def windowCloseCallback(self, sender):
removeObserver(self, "draw")
removeObserver(self, "drawInactive")
removeObserver(self, "currentGlyphChanged")
setExtensionDefault("%s.%s" % (extensionID, "tension"), self.w.HobbySlider.get())
super(metapolator, self).windowCloseCallback(sender)
UpdateCurrentGlyphView()
OpenWindow(metapolator)