added the backlight control and some code for doing repaints

scripts/demo1.py

@@ -2,6 +2,7 @@
 import upiwin
 
 # Save off some color values.
+BLACK = upiwin.rgb(0, 0, 0)
 WHITE = upiwin.rgb(255, 255, 255)
 LTGRAY = upiwin.rgb(204, 204, 204)
 RED = upiwin.rgb(255, 0, 0)
@@ -33,6 +34,21 @@ cmd4_rect = (command_rect[0], 180, command_rect[2], command_rect[3])
 
 def point_in_rect(rect, x, y):
 	return (x >= rect[0]) and (x < rect[2]) and (y >= rect[1]) and (y < rect[3])
+	
+# --- Backlight control ---
+
+backlight_level_list = [1023, 768, 512, 256]
+current_backlight = 0
+
+def do_backlight():
+	upiwin.set_backlight_level(backlight_level_list[current_backlight])
+	
+def select_next_backlight():
+	global current_backlight
+	current_backlight += 1
+	if (current_backlight == len(backlight_level_list):
+		current_backlight = 0
+	do_backlight()
 
 # --- Color selections ---
 
@@ -83,6 +99,14 @@ def draw_object(obj):
 
 objects_drawn = []
 
+def repaint():
+	global drawing_rect, objects_drawn
+	hdc.text_color = BLACK
+	hdc.rop2 = upiwin.R2_COPYPEN
+	hdc.solid_rectangle(drawing_rect[0], drawing_rect[1], drawing_rect[2], drawing_rect[3])
+	for obj in objects_drawn:
+		draw_object(obj)
+
 # --- Graphic feedback --
 
 origin_x = 0
@@ -197,11 +221,15 @@ def on_touchclick(x, y):
 		print("Click command 4")
 
 def on_button_click(button):
+	if button == 1:			# Button 1 = Set backlight level
+		select_next_backlight()
 	if button == 4:			# Button 4 = Exit app
 		upiwin.post_quit_message(0)
 
 # --- Initialize and start message loop ---
 
+do_backlight()
+
 # Draw the basic layout.
 hdc.text_color = LTGRAY
 hdc.rop2 = upiwin.R2_COPYPEN