89 lines
2.5 KiB
Python
89 lines
2.5 KiB
Python
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import cairo
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import math
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def _cairo_draw_node(ctx, radius, color, outer_color, s):
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ctx.save()
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ctx.set_line_width(0.0)
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gradient_color = cairo.RadialGradient(0, 0, 0, 0, 0, radius)
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gradient_color.add_color_stop_rgb(0, *color)
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gradient_color.add_color_stop_rgb(1, *outer_color)
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ctx.set_source(gradient_color)
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ctx.arc(0, 0, radius, 0, 2*math.pi)
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ctx.fill()
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ctx.set_source_rgb(0, 0, 0)
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x_bearing, y_bearing, textw, texth, x_advance, y_advance = ctx.text_extents(s)
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ctx.translate(-textw/2, texth/2)
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ctx.show_text(s)
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ctx.restore()
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def _cairo_draw_connection(ctx, x0, y0, color0, x1, y1, color1):
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ctx.move_to(x0, y0)
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ctx.curve_to(x0, y0+20, x1, y1-20, x1, y1)
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ctx.set_line_width(1.2)
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gradient_color = cairo.LinearGradient(x0, y0, x1, y1)
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gradient_color.add_color_stop_rgb(0, *color0)
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gradient_color.add_color_stop_rgb(1, *color1)
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ctx.set_source(gradient_color)
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ctx.stroke()
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class RenderNode:
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def __init__(self, label, children=None, color=(0.8, 0.8, 0.8), radius=40):
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self.label = label
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if children is None:
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children = []
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self.children = children
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self.color = color
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self.outer_color = (color[0]*3/5, color[1]*3/5, color[2]*3/5)
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self.radius = radius
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self.pitch = self.radius*3
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def get_extents(self):
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if self.children:
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cw, ch = zip(*[c.get_extents() for c in self.children])
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w = max(cw)*len(self.children)
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h = self.pitch + max(ch)
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else:
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w = h = self.pitch
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return w, h
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def render(self, ctx):
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_cairo_draw_node(ctx, self.radius, self.color, self.outer_color, self.label)
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if self.children:
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cpitch = max([c.get_extents()[0] for c in self.children])
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first_child_x = -(cpitch*(len(self.children) - 1))/2
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ctx.save()
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ctx.translate(first_child_x, self.pitch)
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for c in self.children:
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c.render(ctx)
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ctx.translate(cpitch, 0)
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ctx.restore()
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current_x = first_child_x
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for c in self.children:
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current_y = self.pitch - c.radius
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_cairo_draw_connection(ctx, 0, self.radius, self.outer_color, current_x, current_y, c.outer_color)
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current_x += cpitch
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def to_svg(self, name):
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w, h = self.get_extents()
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surface = cairo.SVGSurface(name, w, h)
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ctx = cairo.Context(surface)
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ctx.translate(w/2, self.pitch/2)
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self.render(ctx)
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surface.finish()
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def _test():
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xns = [RenderNode("X"+str(n)) for n in range(5)]
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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)]
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n1 = RenderNode("n1", yns)
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n2 = RenderNode("n2", xns, color=(0.8, 0.5, 0.9))
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top = RenderNode("top", [n1, n2])
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top.to_svg("test.svg")
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if __name__ == "__main__":
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_test()
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