Drawing an arrow cursor
Calling polygon may be faster than a blit.
Here's an example app. It let you move cursor around.
When you press the select key, a red circle is drawn.
The longer you press, the bigger the circle.
Start with the usual stuff
Then the main part of this specific app.
1 2 x,y = 20,20 3 arrow = [(0,0), (0,10), (2,8), (4,12), (6,11), (4,7), (7,7)] 4 canvas.polygon([(x+dx,y+dy) for dx,dy in arrow], 0, 0xffffff)
Here's an example app. It let you move cursor around.
When you press the select key, a red circle is drawn.
The longer you press, the bigger the circle.
Start with the usual stuff
1 2 import e32 3 from appuifw import * 4 from key_codes import * 5 6 class Keyboard(object): 7 def __init__(self): 8 self.state = {} # is this key pressing ? 9 self.buffer= {} # is it waiting to be processed ? 10 def handle_event(self, event): # for event_callback 11 code = event['scancode'] 12 if event['type'] == EEventKeyDown: 13 self.buffer[code]= 1 # put into queue 14 self.state[code] = 1 15 elif event['type'] == EEventKeyUp: 16 self.state[code] = 0 17 def pressing(self, code): # just check 18 return self.state.get(code,0) 19 def pressed(self, code): # check and process the event 20 if self.buffer.get(code,0): 21 self.buffer[code] = 0 # take out of queue 22 return 1 23 return 0 24 25 key = Keyboard() 26 app.body = canvas = Canvas(event_callback=key.handle_event) 27 28 def quit(): 29 global running 30 running = 0 31 32 app.exit_key_handler = quit 33 running = 1
Then the main part of this specific app.
1 2 x,y = 20,20 3 arrow = [(0,0), (0,10), (2,8), (4,12), (6,11), (4,7), (7,7)] 4 5 while running: 6 if key.pressing(EScancodeUpArrow): 7 y -= 1 8 if key.pressing(EScancodeDownArrow): 9 y += 1 10 if key.pressing(EScancodeLeftArrow): 11 x -= 1 12 if key.pressing(EScancodeRightArrow): 13 x += 1 14 if key.pressed(EScancodeSelect): 15 r = 1 16 while key.pressing(EScancodeSelect): 17 r += 1 # bigger red circle 18 canvas.ellipse([(x-r,y-r),(x+r,y+r)], fill=0xff0000) 19 canvas.polygon([(x+dx,y+dy) for dx,dy in arrow], 0, 0xffffff) 20 e32.ao_sleep(0.03) 21 22 canvas.clear() 23 canvas.polygon([(x+dx,y+dy) for dx,dy in arrow], 0, 0xffffff) 24 e32.ao_sleep(0.01)
