upiwin/scripts/test_clipping.py

#  UPIWIN - Micro Pi Windowing Framework Kernel
#  Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License along
#  with this program; if not, write to the Free Software Foundation, Inc.,
#  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#  ------------------------------------------------------------------------
#  Test of line clipping
import upiwin

hdc = upiwin.DevCtxt(type='screen')
hdc.text_color = 0xFFFFFF  # white
hdc.rectangle(99, 99, 200, 200)

clip = hdc.get_clip_rect()
hdc.set_clip_rect(100, 100, 200, 200)

hdc.text_color = 0x0000FF  # red
hdc.move_to(50, 200)
hdc.line_to(200, 50)

hdc.text_color = 0x00FF00  # green
hdc.move_to(250, 200)
hdc.line_to(100, 50)

hdc.text_color = 0xFF0000  # blue
hdc.move_to(50, 100)
hdc.line_to(200, 250)

hdc.text_color = 0x00FFFF  # yellow
hdc.move_to(250, 100)
hdc.line_to(100, 250)

hdc.set_clip_rect(clip[0], clip[1], clip[2], clip[3])

msg = {}
while upiwin.get_message(msg):
	if msg['message'] == upiwin.WM_HWBUTTONUP:
		bn = msg['attrs'][0]
		if bn == 4:
			print("Quitting the application.")
			upiwin.post_quit_message(0)