litex/migen/util/treeviz.py

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import cairo
import math
def _cairo_draw_node(ctx, dx, radius, color, outer_color, s):
ctx.save()
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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()
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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)
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ctx.restore()
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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()
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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
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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
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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
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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()
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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)
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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()
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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")
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if __name__ == "__main__":
_test()