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.
x,y = 20,20 arrow = [(0,0), (0,10), (2,8), (4,12), (6,11), (4,7), (7,7)] 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
import e32 from appuifw import * from key_codes import * class Keyboard(object): def __init__(self): self.state = {} # is this key pressing ? self.buffer= {} # is it waiting to be processed ? def handle_event(self, event): # for event_callback code = event['scancode'] if event['type'] == EEventKeyDown: self.buffer[code]= 1 # put into queue self.state[code] = 1 elif event['type'] == EEventKeyUp: self.state[code] = 0 def pressing(self, code): # just check return self.state.get(code,0) def pressed(self, code): # check and process the event if self.buffer.get(code,0): self.buffer[code] = 0 # take out of queue return 1 return 0 key = Keyboard() app.body = canvas = Canvas(event_callback=key.handle_event) def quit(): global running running = 0 app.exit_key_handler = quit running = 1
Then the main part of this specific app.
x,y = 20,20 arrow = [(0,0), (0,10), (2,8), (4,12), (6,11), (4,7), (7,7)] while running: if key.pressing(EScancodeUpArrow): y -= 1 if key.pressing(EScancodeDownArrow): y += 1 if key.pressing(EScancodeLeftArrow): x -= 1 if key.pressing(EScancodeRightArrow): x += 1 if key.pressed(EScancodeSelect): r = 1 while key.pressing(EScancodeSelect): r += 1 # bigger red circle canvas.ellipse([(x-r,y-r),(x+r,y+r)], fill=0xff0000) canvas.polygon([(x+dx,y+dy) for dx,dy in arrow], 0, 0xffffff) e32.ao_sleep(0.03) canvas.clear() canvas.polygon([(x+dx,y+dy) for dx,dy in arrow], 0, 0xffffff) e32.ao_sleep(0.01)
