first commit

libraries/lvgl/examples/widgets/img/lv_example_img_4.py

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+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)
+