113 lines
3.4 KiB
Python
113 lines
3.4 KiB
Python
import cairo
|
|
import math
|
|
|
|
|
|
def _cairo_draw_node(ctx, dx, radius, color, outer_color, s):
|
|
ctx.save()
|
|
|
|
ctx.translate(dx, 0)
|
|
|
|
ctx.set_line_width(0.0)
|
|
gradient_color = cairo.RadialGradient(0, 0, 0, 0, 0, radius)
|
|
gradient_color.add_color_stop_rgb(0, *color)
|
|
gradient_color.add_color_stop_rgb(1, *outer_color)
|
|
ctx.set_source(gradient_color)
|
|
ctx.arc(0, 0, radius, 0, 2*math.pi)
|
|
ctx.fill()
|
|
|
|
lines = s.split("\n")
|
|
textws = []
|
|
texths = []
|
|
for line in lines:
|
|
x_bearing, y_bearing, w, h, x_advance, y_advance = ctx.text_extents(line)
|
|
textws.append(w)
|
|
texths.append(h + 2)
|
|
ctx.translate(0, -sum(texths[1:])/2)
|
|
for line, w, h in zip(lines, textws, texths):
|
|
ctx.translate(-w/2, h/2)
|
|
ctx.move_to(0, 0)
|
|
ctx.set_source_rgb(0, 0, 0)
|
|
ctx.show_text(line)
|
|
ctx.translate(w/2, h/2)
|
|
|
|
ctx.restore()
|
|
|
|
|
|
def _cairo_draw_connection(ctx, x0, y0, color0, x1, y1, color1):
|
|
ctx.move_to(x0, y0)
|
|
ctx.curve_to(x0, y0+20, x1, y1-20, x1, y1)
|
|
ctx.set_line_width(1.2)
|
|
gradient_color = cairo.LinearGradient(x0, y0, x1, y1)
|
|
gradient_color.add_color_stop_rgb(0, *color0)
|
|
gradient_color.add_color_stop_rgb(1, *color1)
|
|
ctx.set_source(gradient_color)
|
|
ctx.stroke()
|
|
|
|
|
|
class RenderNode:
|
|
def __init__(self, label, children=None, color=(0.8, 0.8, 0.8), radius=40):
|
|
self.label = label
|
|
if children is None:
|
|
children = []
|
|
self.children = children
|
|
self.color = color
|
|
self.outer_color = (color[0]*3/5, color[1]*3/5, color[2]*3/5)
|
|
self.radius = radius
|
|
self.pitch = self.radius*3
|
|
|
|
def get_dimensions(self):
|
|
if self.children:
|
|
cws, chs, cdxs = zip(*[c.get_dimensions() for c in self.children])
|
|
w = sum(cws)
|
|
h = self.pitch + max(chs)
|
|
dx = cws[0]/4 - cws[-1]/4
|
|
else:
|
|
w = h = self.pitch
|
|
dx = 0
|
|
return w, h, dx
|
|
|
|
def render(self, ctx):
|
|
if self.children:
|
|
cws, chs, cdxs = zip(*[c.get_dimensions() for c in self.children])
|
|
first_child_x = -sum(cws)/2
|
|
|
|
ctx.save()
|
|
ctx.translate(first_child_x, self.pitch)
|
|
for c, w in zip(self.children, cws):
|
|
ctx.translate(w/2, 0)
|
|
c.render(ctx)
|
|
ctx.translate(w/2, 0)
|
|
ctx.restore()
|
|
|
|
dx = cws[0]/4 - cws[-1]/4
|
|
|
|
current_x = first_child_x
|
|
for c, w, cdx in zip(self.children, cws, cdxs):
|
|
current_y = self.pitch - c.radius
|
|
current_x += w/2
|
|
_cairo_draw_connection(ctx, dx, self.radius, self.outer_color, current_x+cdx, current_y, c.outer_color)
|
|
current_x += w/2
|
|
else:
|
|
dx = 0
|
|
_cairo_draw_node(ctx, dx, self.radius, self.color, self.outer_color, self.label)
|
|
|
|
def to_svg(self, name):
|
|
w, h, dx = self.get_dimensions()
|
|
surface = cairo.SVGSurface(name, w, h)
|
|
ctx = cairo.Context(surface)
|
|
ctx.translate(w/2, self.pitch/2)
|
|
self.render(ctx)
|
|
surface.finish()
|
|
|
|
|
|
def _test():
|
|
xns = [RenderNode("X"+str(n)) for n in range(5)]
|
|
yns = [RenderNode("Y"+str(n), [RenderNode("foo", color=(0.1*n, 0.5+0.2*n, 1.0-0.3*n))]) for n in range(3)]
|
|
n1 = RenderNode("n1", yns)
|
|
n2 = RenderNode("n2", xns, color=(0.8, 0.5, 0.9))
|
|
top = RenderNode("top", [n1, n2])
|
|
top.to_svg("test.svg")
|
|
|
|
if __name__ == "__main__":
|
|
_test()
|