Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
Sebastien Bourdeauducq
committed
Aug 7, 2013
1 parent
efa7dc9
commit cc5ff7a
Showing
1 changed file
with
88 additions
and
0 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,88 @@ | ||
import cairo | ||
import math | ||
|
||
def _cairo_draw_node(ctx, radius, color, outer_color, s): | ||
ctx.save() | ||
|
||
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() | ||
|
||
ctx.set_source_rgb(0, 0, 0) | ||
x_bearing, y_bearing, textw, texth, x_advance, y_advance = ctx.text_extents(s) | ||
ctx.translate(-textw/2, texth/2) | ||
ctx.show_text(s) | ||
|
||
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_extents(self): | ||
if self.children: | ||
cw, ch = zip(*[c.get_extents() for c in self.children]) | ||
w = max(cw)*len(self.children) | ||
h = self.pitch + max(ch) | ||
else: | ||
w = h = self.pitch | ||
return w, h | ||
|
||
def render(self, ctx): | ||
_cairo_draw_node(ctx, self.radius, self.color, self.outer_color, self.label) | ||
if self.children: | ||
cpitch = max([c.get_extents()[0] for c in self.children]) | ||
first_child_x = -(cpitch*(len(self.children) - 1))/2 | ||
|
||
ctx.save() | ||
ctx.translate(first_child_x, self.pitch) | ||
for c in self.children: | ||
c.render(ctx) | ||
ctx.translate(cpitch, 0) | ||
ctx.restore() | ||
|
||
current_x = first_child_x | ||
for c in self.children: | ||
current_y = self.pitch - c.radius | ||
_cairo_draw_connection(ctx, 0, self.radius, self.outer_color, current_x, current_y, c.outer_color) | ||
current_x += cpitch | ||
|
||
def to_svg(self, name): | ||
w, h = self.get_extents() | ||
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() |