def double_sided_arrow_head (x1,y1,x2,y2,a,b,c): '''last two points of arrow 1->2 a,b,c like tkinter a = leght from point 2 where the head touches the line (out point A) b = total lenght of the head (defines also help point P on the line) c = width Point B will be the outer Point of the head rl = "r" the head is on the right , = "l" left''' xa,ya = x2,y2 xp,yp = geometry.elongate_line (x1,y1,x2,y2,-b) xb,yb = geometry.point_at_distance_from_line (x1,y1,xp,yp,c) xd,yd = geometry.point_at_distance_from_line (x1,y1,xp,yp,-c) xc,yc = geometry.elongate_line (x1,y1,x2,y2,-a) return xa,ya, xb,yb, xc,yc, xd,yd
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 single_sided_arrow_head (x1,y1,x2,y2,a,b,c,lw): '''last two points of arrow 1->2 a,b,c like tkinter a = leght from point 2 where the head touches the line (out point A) b = total lenght of the head (defines also help point P on the line) c = width Point B will be the outer Point of the head rl = "r" the head is on the right , = "l" left, lw is the line_width of the line the arrow will be attached to''' xa,ya = geometry.elongate_line (x1,y1,x2,y2,-a) xa,ya = geometry.point_at_distance_from_line (x1,y1,xa,ya,-misc.signum(c)*(lw-1.0)/2.0) xp,yp = geometry.elongate_line (x1,y1,x2,y2,-b) xb,yb = geometry.point_at_distance_from_line (x1,y1,xp,yp,c) xc,yc = geometry.point_at_distance_from_line (x1,y1,x2,y2,-misc.signum(c)*(lw-1.0)/2.0) return xa,ya, xc,yc, xb,yb
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 retro_arrow_head (x1,y1,x2,y2,length,width,d): """arrow head at 2 # length # |---| _ # C\ | # \ | width # A----------------B\-P | # 1 d | __R___\|2 - # /| # D----------------E/-Q # / # F/ # P,Q,R are not drawn """ w_ratio = 1.0*d / width dl = w_ratio * length xh ,yh = geometry.elongate_line( x1,y1,x2,y2,dl) xr, yr = geometry.elongate_line( x1,y1,x2,y2,dl-length) xc, yc = geometry.point_at_distance_from_line (x1,y1,xr,yr,width) xf, yf = geometry.point_at_distance_from_line (x1,y1,xr,yr,-width) return (xc,yc, xh,yh, xf,yf)
