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Diffstat (limited to '')
-rw-r--r-- | src/3rdparty/2geom/src/cython/utils.py | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/src/3rdparty/2geom/src/cython/utils.py b/src/3rdparty/2geom/src/cython/utils.py new file mode 100644 index 0000000..1115d32 --- /dev/null +++ b/src/3rdparty/2geom/src/cython/utils.py @@ -0,0 +1,52 @@ +from Tkinter import * + +import math + +import cy2geom +from cy2geom import Point, Path + + +def Nagon(N): + """Return N-agon with side of length 1.""" + side = cy2geom.LineSegment(Point(-0.5, 0), Point(0.5, 0)) + angle = 2*math.pi/N + distance_to_center = 0.5 / math.tan(math.pi/N) + return Path.fromList( + [ side.transformed( + cy2geom.Translate(Point(0, -distance_to_center))* + cy2geom.Rotate(angle*i)) + for i in range(N) + ], + stitching = Path.STITCH_DISCONTINUOUS, + closed = True ) + +def draw(c, dt=0.001, batch=10, scale=20, x_offset = 400, y_offset = 300): + """Draw curve or path.""" + master = Tk() + w = Canvas(master, width=800, height=600) + w.pack() + n = 0 + t = 0 + points = [] + + if isinstance(c, Path): + maxt = c.size_default() + else: + maxt = 1 + + while (t < maxt): + t = n*dt + n+=1 + p = c(t) + points.extend( [ p.x * scale + x_offset, p.y * scale + y_offset] ) + + while points: + draw_points = tuple(points[:batch*2]) + if len(points) == 2: + break + del points[:batch*2] + + l = w.create_line(*draw_points) + w.grid() + + master.mainloop() |