multitouch/tests/draw.py

#!/usr/bin/env python
from __future__ import division
import pygame
from threading import Thread
from math import degrees

from src.server import GestureServer
from src.window import FullscreenWindow
from src.trackers.transform import TransformationTracker
from src.trackers.tap import TapTracker
from src.screen import screen_size

from tests.parse_arguments import create_parser, parse_args
parser = create_parser()
parser.add_argument('-f', '--fullscreen', action='store_true', default=False,
                    help='run in fullscreen')
args = parse_args(parser)


pygame.init()

# Config
FINGER_RADIUS = 20
CENTROID_RADIUS = 15
W, H = screen_size if args.fullscreen else (640, 480)

BG_COLOR = 0, 0, 0
LINE_COLOR = 128, 128, 128
CIRCLE_COLOR = 255, 255, 255
RECT_COLOR = 0, 200, 0
RECT_POS = W / 2, H / 2
RECT_SIZE = W / 6., H / 6.

TAP_RADIUS = 65
TAP_INCREMENT = .3

BEAM_COLOR = 255, 50, 50
BEAM_LENGTH = 50
BEAM_WIDTH = 3
BEAM_INCREMENT = .8

MAX_SCALE = 10

# Create canvas GUI
flags = pygame.FULLSCREEN if args.fullscreen else 0
screen = pygame.display.set_mode((W, H), flags)


def coord(x, y):
    w, h = screen_size
    return int(round(W / w * x)), int(round(H / h * y))


# Global state
angle = 0
scale = 1
taps = []
dtaps = []


def update():
    global taps, dtaps

    # Clear previous frame
    screen.fill(BG_COLOR)

    # Apply scale and rotation to a fixed-size rectangle canvas
    canvas = pygame.Surface(RECT_SIZE)
    canvas.fill(RECT_COLOR)
    transformed = pygame.transform.rotozoom(canvas, degrees(angle), scale)
    rect = transformed.get_rect()
    rect.center = W / 2, H / 2
    screen.blit(transformed, rect)

    # Draw touch points
    if transform.centroid:
        c = coord(*transform.centroid.xy)

    for p in server.points.itervalues():
        xy = coord(p.x, p.y)

        # Draw line to centroid
        if transform.centroid:
            pygame.draw.line(screen, LINE_COLOR, xy, c, 1)

        # Draw outlined circle around touch point
        pygame.draw.circle(screen, CIRCLE_COLOR, xy, FINGER_RADIUS, 1)

        # Fill filled circle with background color within the outline
        pygame.draw.circle(screen, BG_COLOR, xy, FINGER_RADIUS - 1, 0)

    # Draw filled circle around centroid
    if transform.centroid:
        pygame.draw.circle(screen, CIRCLE_COLOR, c, CENTROID_RADIUS)

    # Draw an expanding circle around each tap event
    taps = filter(lambda (xy, r): r <= TAP_RADIUS, taps)

    for tap in taps:
        xy, radius = tap
        pygame.draw.circle(screen, CIRCLE_COLOR, xy, int(radius), 2)

        # Increment radius
        tap[1] += TAP_INCREMENT

    # Shoot a beam from each double tap event to the left
    dtaps = filter(lambda (x, y, s): 0 <= x <= W, dtaps)

    for dtap in dtaps:
        x, y, single = dtap

        if single:
            start_x = x
            end_x = x + BEAM_LENGTH
            dtap[0] += BEAM_INCREMENT
        else:
            start_x = x - BEAM_LENGTH
            end_x = x
            dtap[0] -= BEAM_INCREMENT

        pygame.draw.line(screen, BEAM_COLOR, (start_x, y), (end_x, y), BEAM_WIDTH)

    # Update canvas
    pygame.display.flip()


# Create server and fullscreen window
server = GestureServer()
win = FullscreenWindow(server=server)


# Bind trackers
def rotate(gesture):
    global angle
    angle += gesture.get_angle()

def pinch(gesture):
    global scale
    scale = min(scale * gesture.get_scale(), MAX_SCALE)

transform = TransformationTracker(win)
transform.rotate(rotate)
transform.pinch(pinch)

tap = TapTracker(win)
tap.tap(lambda g: taps.append([coord(*g.xy), FINGER_RADIUS]))
tap.single_tap(lambda g: dtaps.append(list(coord(*g.xy)) + [1]))
tap.double_tap(lambda g: dtaps.append(list(coord(*g.xy)) + [0]))


try:
    # Start touch gesture server in separate thread
    thread = Thread(target=server.start)
    thread.daemon = True
    thread.start()

    # Start GUI event loop
    def is_quit_event(e):
        return e.type == pygame.QUIT \
            or (e.type == pygame.KEYDOWN and e.key == ord('q'))

    while not any(filter(is_quit_event, pygame.event.get())):
        update()
except KeyboardInterrupt:
    pass
finally:
    server.stop()