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libraries/lvgl/examples/widgets/meter/lv_example_meter_3.py

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+#!//opt/bin/lv_micropython -i
+import utime as time
+import lvgl as lv
+import display_driver
+from imagetools import get_png_info, open_png
+
+# 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_hand_min.png','rb') as f:
+        img_hand_min_data = f.read()
+except:
+    print("Could not find img_hand_min.png")
+    sys.exit()
+
+img_hand_min_dsc = lv.img_dsc_t({
+  'data_size': len(img_hand_min_data),
+  'data': img_hand_min_data
+})
+
+# Create an image from the png file
+try:
+    with open('../../assets/img_hand_hour.png','rb') as f:
+        img_hand_hour_data = f.read()
+except:
+    print("Could not find img_hand_hour.png")
+    sys.exit()
+
+img_hand_hour_dsc = lv.img_dsc_t({
+  'data_size': len(img_hand_hour_data),
+  'data': img_hand_hour_data
+})
+
+def set_value(indic, v):
+    meter.set_indicator_value(indic, v)
+#
+# A clock from a meter
+#
+
+meter = lv.meter(lv.scr_act())
+meter.set_size(220, 220)
+meter.center()
+
+# Create a scale for the minutes
+# 61 ticks in a 360 degrees range (the last and the first line overlaps)
+scale_min = meter.add_scale()
+meter.set_scale_ticks(scale_min, 61, 1, 10, lv.palette_main(lv.PALETTE.GREY))
+meter.set_scale_range(scale_min, 0, 60, 360, 270)
+
+# Create another scale for the hours. It's only visual and contains only major ticks
+scale_hour = meter.add_scale()
+meter.set_scale_ticks(scale_hour, 12, 0, 0, lv.palette_main(lv.PALETTE.GREY))  # 12 ticks
+meter.set_scale_major_ticks(scale_hour, 1, 2, 20, lv.color_black(), 10)         # Every tick is major
+meter.set_scale_range(scale_hour, 1, 12, 330, 300)                             # [1..12] values in an almost full circle
+
+#    LV_IMG_DECLARE(img_hand)
+
+# Add the hands from images
+indic_min = meter.add_needle_img(scale_min, img_hand_min_dsc, 5, 5)
+indic_hour = meter.add_needle_img(scale_min, img_hand_hour_dsc, 5, 5)
+
+# Create an animation to set the value
+a1 = lv.anim_t()
+a1.init()
+a1.set_values(0, 60)
+a1.set_repeat_count(lv.ANIM_REPEAT.INFINITE)
+a1.set_time(2000)        # 2 sec for 1 turn of the minute hand (1 hour)
+a1.set_var(indic_min)
+a1.set_custom_exec_cb(lambda a1,val: set_value(indic_min,val))
+lv.anim_t.start(a1)
+
+a2 = lv.anim_t()
+a2.init()
+a2.set_var(indic_hour)
+a2.set_time(24000)       # 24 sec for 1 turn of the hour hand
+a2.set_values(0, 60)
+a2.set_custom_exec_cb(lambda a2,val: set_value(indic_hour,val))
+lv.anim_t.start(a2)
+