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#!/usr/bin/env python
"""Based on cairo-demo/X11/cairo-demo.c
"""
import cairo
from gi.repository import Gdk, Gtk
SIZE = 30
def triangle(ctx):
ctx.move_to(SIZE, 0)
ctx.rel_line_to(SIZE, 2*SIZE)
ctx.rel_line_to(-2*SIZE, 0)
ctx.close_path()
def square(ctx):
ctx.move_to(0, 0)
ctx.rel_line_to(2*SIZE, 0)
ctx.rel_line_to(0, 2*SIZE)
ctx.rel_line_to(-2*SIZE, 0)
ctx.close_path()
def bowtie(ctx):
ctx.move_to(0, 0)
ctx.rel_line_to(2*SIZE, 2*SIZE)
ctx.rel_line_to(-2*SIZE, 0)
ctx.rel_line_to(2*SIZE, -2*SIZE)
ctx.close_path()
def inf(ctx):
ctx.move_to(0, SIZE)
ctx.rel_curve_to(0,SIZE, SIZE,SIZE, 2*SIZE,0)
ctx.rel_curve_to(SIZE,-SIZE, 2*SIZE,-SIZE, 2*SIZE,0)
ctx.rel_curve_to(0,SIZE, -SIZE,SIZE, -2*SIZE,0)
ctx.rel_curve_to(-SIZE,-SIZE, -2*SIZE,-SIZE, -2*SIZE,0)
ctx.close_path()
def draw_shapes(ctx, x, y, fill):
ctx.save()
ctx.new_path()
ctx.translate(x+SIZE, y+SIZE)
bowtie(ctx)
if fill:
ctx.fill()
else:
ctx.stroke()
ctx.new_path()
ctx.translate(3*SIZE, 0)
square(ctx)
if fill:
ctx.fill()
else:
ctx.stroke()
ctx.new_path()
ctx.translate(3*SIZE, 0)
triangle(ctx)
if fill:
ctx.fill()
else:
ctx.stroke()
ctx.new_path()
ctx.translate(3*SIZE, 0)
inf(ctx)
if fill:
ctx.fill()
else:
ctx.stroke()
ctx.restore()
def fill_shapes(ctx, x, y):
draw_shapes(ctx, x, y, True)
def stroke_shapes(ctx, x, y):
draw_shapes(ctx, x, y, False)
def expose (da, event):
ctx = Gdk.cairo_create(da.window)
ctx.set_source_rgb(0, 0, 0)
ctx.set_line_width(SIZE / 4)
ctx.set_tolerance(0.1)
ctx.set_line_join(cairo.LINE_JOIN_ROUND)
ctx.set_dash([SIZE/4.0, SIZE/4.0], 0)
stroke_shapes(ctx, 0, 0)
ctx.set_dash([], 0)
stroke_shapes(ctx, 0, 3*SIZE)
ctx.set_line_join(cairo.LINE_JOIN_BEVEL)
stroke_shapes(ctx, 0, 6*SIZE)
ctx.set_line_join(cairo.LINE_JOIN_MITER)
stroke_shapes(ctx, 0, 9*SIZE)
fill_shapes(ctx, 0, 12*SIZE)
ctx.set_line_join(cairo.LINE_JOIN_BEVEL)
fill_shapes(ctx, 0, 15*SIZE)
ctx.set_source_rgb(1,0,0)
stroke_shapes(ctx, 0, 15*SIZE)
def main():
win = Gtk.Window()
win.connect('destroy', Gtk.main_quit)
win.set_default_size(450, 550)
drawingarea = Gtk.DrawingArea()
win.add(drawingarea)
drawingarea.connect('expose_event', expose)
win.show_all()
Gtk.main()
if __name__ == '__main__':
main()
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