#!python
# -*- mode: python; Encoding: utf-8; coding: utf-8 -*-
# Last updated: <2017/04/26 20:45:40 +0900>

u"""
pycairoの動作テスト.

角が丸い四角を描画して、pngで保存。

動作確認環境:
Windows10 x64 + Python 2.7.13 32bit + pycairo 1.8.10

参考ページ:
rounded rectangle
https://www.cairographics.org/samples/rounded_rectangle/
"""

import cairo
import math


def draw_rounder_rectangle(ctx, x, y, w, h, ra):
    """Set sub path rounded rectangle."""
    deg = math.pi / 180.0
    ctx.new_sub_path()
    ctx.arc(x + w - ra, y + ra, ra, -90 * deg, 0 * deg)
    ctx.arc(x + w - ra, y + h - ra, ra, 0 * deg, 90 * deg)
    ctx.arc(x + ra, y + h - ra, ra, 90 * deg, 180 * deg)
    ctx.arc(x + ra, y + ra, ra, 180 * deg, 270 * deg)
    ctx.close_path()

w, h = 640, 480
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, w, h)
ctx = cairo.Context(surface)
ctx.set_antialias(cairo.ANTIALIAS_SUBPIXEL)
ctx.set_line_width(6.0)

x, y = 24, 24
w, h = 480, 320
radius = 32
draw_rounder_rectangle(ctx, x, y, w, h, radius)
ctx.set_source_rgb(0, 0, 1)
ctx.fill_preserve()
ctx.set_source_rgb(0, 1, 0)
ctx.stroke()

surface.write_to_png("result.png")