def _draw_equilibrium(self):
width = 3
orig_coords = [p.get_xy() for p in self.points]
items = []
for sig in (-1, 1):
coords = geometry.find_parallel_polyline(orig_coords, sig * width)
if sig == -1:
x1, y1 = coords[1]
x2, y2 = coords[0]
coords[0] = geometry.elongate_line(
x1, y1, x2, y2, -8) # shorten the line - looks better
else:
x1, y1 = coords[-2]
x2, y2 = coords[-1]
coords[-1] = geometry.elongate_line(
x1, y1, x2, y2, -8) # shorten the line - looks better
# the line
ps = tuple(j for i in coords for j in i)
item1 = self.paper.create_line(ps,
tags='arrow',
width=self.line_width,
smooth=self.spline,
fill=self.line_color)
items.append(item1)
# the pin
cs = single_sided_arrow_head(x1, y1, x2, y2, 8, 10, 3,
self.line_width)
items.append(
self.paper.create_polygon(cs,
fill=self.line_color,
outline=self.line_color,
width=1,
tags="arrow_no_focus",
joinstyle="miter"))
return items
def _draw_retro(self):
width = 3
coords = [p.get_xy() for p in self.points]
items = []
# the pins
if self.pin in (2, 3):
head = retro_arrow_head(coords[1][0], coords[1][1], coords[0][0],
coords[0][1], 8, 8, width)
head_item = self.paper.create_line(head,
width=self.line_width,
fill=self.line_color,
joinstyle="miter")
items.append(head_item)
if self.pin in (1, 3):
head = retro_arrow_head(coords[-2][0], coords[-2][1],
coords[-1][0], coords[-1][1], 8, 8, width)
head_item = self.paper.create_line(head,
width=self.line_width,
fill=self.line_color,
joinstyle="miter")
items.append(head_item)
# the lines
for sig in (-1, 1):
cs = geometry.find_parallel_polyline(coords, sig * width)
ps = tuple(j for i in cs for j in i)
item1 = self.paper.create_line(ps,
tags='arrow',
width=self.line_width,
smooth=self.spline,
fill=self.line_color)
items.append(item1)
return items
def _draw_equilibrium2(self):
width = 3
orig_coords = [p.get_xy() for p in self.points]
items = []
for sig in (-1, 1):
coords = geometry.find_parallel_polyline(orig_coords, sig * width)
if not self.spline:
# if its not a spline, we can draw it all in one go
if sig == -1:
x1, y1 = coords[1]
x2, y2 = coords[0]
xp, yp = geometry.elongate_line(x1, y1, x2, y2, -8)
xp, yp = geometry.point_at_distance_from_line(
x1, y1, xp, yp, 5)
coords.insert(0, (xp, yp))
else:
x1, y1 = coords[-2]
x2, y2 = coords[-1]
xp, yp = geometry.elongate_line(x1, y1, x2, y2, -8)
xp, yp = geometry.point_at_distance_from_line(
x1, y1, xp, yp, 5)
coords.append((xp, yp))
else:
# splines must have a sharp point at the end - the must have a separate head
if sig == -1:
x1, y1 = coords[1]
x2, y2 = coords[0]
else:
x1, y1 = coords[-2]
x2, y2 = coords[-1]
xp, yp = geometry.elongate_line(x1, y1, x2, y2, -8)
xp, yp = geometry.point_at_distance_from_line(
x1, y1, xp, yp, 5)
items.append(
self.paper.create_line((x2, y2, xp, yp),
tags='arrow',
width=self.line_width,
smooth=self.spline,
fill=self.line_color,
joinstyle="miter"))
# the line (with optional pin)
ps = tuple(j for i in coords for j in i)
item1 = self.paper.create_line(ps,
tags='arrow',
width=self.line_width,
smooth=self.spline,
fill=self.line_color,
joinstyle="miter")
items.append(item1)
return items
def _draw_equilibrium2( self):
width = 3
orig_coords = [p.get_xy() for p in self.points]
items = []
for sig in (-1,1):
coords = geometry.find_parallel_polyline( orig_coords, sig*width)
if not self.spline:
# if its not a spline, we can draw it all in one go
if sig == -1:
x1, y1 = coords[1]
x2, y2 = coords[0]
xp, yp = geometry.elongate_line( x1,y1,x2,y2,-8)
xp, yp = geometry.point_at_distance_from_line( x1,y1,xp,yp,5)
coords.insert(0,(xp,yp))
else:
x1, y1 = coords[-2]
x2, y2 = coords[-1]
xp, yp = geometry.elongate_line( x1,y1,x2,y2,-8)
xp, yp = geometry.point_at_distance_from_line( x1,y1,xp,yp,5)
coords.append((xp,yp))
else:
# splines must have a sharp point at the end - the must have a separate head
if sig == -1:
x1, y1 = coords[1]
x2, y2 = coords[0]
else:
x1, y1 = coords[-2]
x2, y2 = coords[-1]
xp, yp = geometry.elongate_line( x1,y1,x2,y2,-8)
xp, yp = geometry.point_at_distance_from_line( x1,y1,xp,yp,5)
items.append( self.paper.create_line( (x2,y2,xp,yp),
tags='arrow', width=self.line_width,
smooth=self.spline, fill=self.line_color,
joinstyle="miter"))
# the line (with optional pin)
ps = reduce( operator.add, coords)
item1 = self.paper.create_line( ps, tags='arrow', width=self.line_width,
smooth=self.spline, fill=self.line_color,
joinstyle="miter")
items.append( item1)
return items
def _draw_retro( self):
width = 3
coords = [p.get_xy() for p in self.points]
items = []
# the pins
if self.pin in (2,3):
head = retro_arrow_head(coords[1][0],coords[1][1],coords[0][0],coords[0][1],8,8,width)
head_item = self.paper.create_line( head, width=self.line_width,fill=self.line_color,joinstyle="miter")
items.append( head_item)
if self.pin in (1,3):
head = retro_arrow_head(coords[-2][0],coords[-2][1],coords[-1][0],coords[-1][1],8,8,width)
head_item = self.paper.create_line( head, width=self.line_width,fill=self.line_color,joinstyle="miter")
items.append( head_item)
# the lines
for sig in (-1,1):
cs = geometry.find_parallel_polyline( coords, sig*width)
ps = reduce( operator.add, cs)
item1 = self.paper.create_line( ps, tags='arrow', width=self.line_width,
smooth=self.spline, fill=self.line_color)
items.append( item1)
return items
def _draw_equilibrium( self):
width = 3
orig_coords = [p.get_xy() for p in self.points]
items = []
for sig in (-1,1):
coords = geometry.find_parallel_polyline( orig_coords, sig*width)
if sig == -1:
x1, y1 = coords[1]
x2, y2 = coords[0]
coords[0] = geometry.elongate_line( x1,y1,x2,y2,-8) # shorten the line - looks better
else:
x1, y1 = coords[-2]
x2, y2 = coords[-1]
coords[-1] = geometry.elongate_line( x1,y1,x2,y2,-8) # shorten the line - looks better
# the line
ps = reduce( operator.add, coords)
item1 = self.paper.create_line( ps, tags='arrow', width=self.line_width,
smooth=self.spline, fill=self.line_color)
items.append( item1)
# the pin
cs = single_sided_arrow_head(x1, y1, x2, y2, 8, 10, 3, self.line_width)
items.append( self.paper.create_polygon( cs, fill=self.line_color, outline=self.line_color,
width=1, tags="arrow_no_focus", joinstyle="miter"))
return items