#!/usr/bin/env python
from imagetools import get_png_info, open_png

def ofs_y_anim(img, v):
	img.set_offset_y(v)
# print(img,v)

# Register PNG image decoder
	decoder = lv.img.decoder_create()
			  decoder.info_cb = get_png_info
								decoder.open_cb = open_png

# Create an image from the png file
									try:
									with open('../../assets/img_skew_strip.png', 'rb') as f:
											png_data = f.read()
											except:
													print("Could not find img_skew_strip.png")
													sys.exit()

													img_skew_strip = lv.img_dsc_t({
'data_size': len(png_data),
'data': png_data
})

#
# Image styling and offset
#

style = lv.style_t()
		style.init()
		style.set_bg_color(lv.palette_main(lv.PALETTE.YELLOW))
		style.set_bg_opa(lv.OPA.COVER)
		style.set_img_recolor_opa(lv.OPA.COVER)
		style.set_img_recolor(lv.color_black())

		img = lv.img(lv.scr_act())
			  img.add_style(style, 0)
			  img.set_src(img_skew_strip)
			  img.set_size(150, 100)
			  img.center()

			  a = lv.anim_t()
				  a.init()
				  a.set_var(img)
				  a.set_values(0, 100)
				  a.set_time(3000)
				  a.set_playback_time(500)
				  a.set_repeat_count(lv.ANIM_REPEAT.INFINITE)
				  a.set_custom_exec_cb(lambda a, val: ofs_y_anim(img, val))
				  lv.anim_t.start(a)

