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#!/usr/bin/env python3
"""Based on cairo-demo/X11/cairo-demo.c."""
import cairo
import gi
gi.require_version("Gtk", "4.0")
from gi.repository import Gtk
SIZE = 30
class Application(Gtk.Application):
def do_activate(self):
window = Gtk.ApplicationWindow(
application=self, default_width=450, default_height=600
)
drawing_area = Gtk.DrawingArea()
drawing_area.set_draw_func(self.draw)
window.set_child(drawing_area)
window.present()
def triangle(self, 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(self, 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(self, 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(self, 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(self, ctx, x, y, fill):
ctx.save()
ctx.new_path()
ctx.translate(x + SIZE, y + SIZE)
self.bowtie(ctx)
if fill:
ctx.fill()
else:
ctx.stroke()
ctx.new_path()
ctx.translate(3 * SIZE, 0)
self.square(ctx)
if fill:
ctx.fill()
else:
ctx.stroke()
ctx.new_path()
ctx.translate(3 * SIZE, 0)
self.triangle(ctx)
if fill:
ctx.fill()
else:
ctx.stroke()
ctx.new_path()
ctx.translate(3 * SIZE, 0)
self.inf(ctx)
if fill:
ctx.fill()
else:
ctx.stroke()
ctx.restore()
def fill_shapes(self, ctx, x, y):
self.draw_shapes(ctx, x, y, True)
def stroke_shapes(self, ctx, x, y):
self.draw_shapes(ctx, x, y, False)
def draw(self, da, ctx, width, height):
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)
self.stroke_shapes(ctx, 0, 0)
ctx.set_dash([], 0)
self.stroke_shapes(ctx, 0, 3 * SIZE)
ctx.set_line_join(cairo.LINE_JOIN_BEVEL)
self.stroke_shapes(ctx, 0, 6 * SIZE)
ctx.set_line_join(cairo.LINE_JOIN_MITER)
self.stroke_shapes(ctx, 0, 9 * SIZE)
self.fill_shapes(ctx, 0, 12 * SIZE)
ctx.set_line_join(cairo.LINE_JOIN_BEVEL)
self.fill_shapes(ctx, 0, 15 * SIZE)
ctx.set_source_rgb(1, 0, 0)
self.stroke_shapes(ctx, 0, 15 * SIZE)
app = Application()
app.run()
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