multitouch/tests/draw.py

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

from tests.parse_arguments import create_parser, parse_args
from src import FullscreenArea, create_driver
from src.screen import screen_size

# Parse arguments
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 = []
points = []


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 and  transform.centroid:
            c = coord(*transform.centroid)

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

        # Draw line to centroid
        if transform and 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 and 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()


transform = None


def save_tracker(gesture):
    global transform

    if not transform:
        transform = gesture.get_tracker()


def rotate(gesture):
    global angle
    angle += gesture.get_angle()
    save_tracker(gesture)


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


area = FullscreenArea()
driver = create_driver(area)
area.on_rotate(rotate)
area.on_pinch(pinch)

area.on_tap(lambda g: taps.append([coord(*g), FINGER_RADIUS]))
area.on_single_tap(lambda g: dtaps.append(list(coord(*g)) + [1]))
area.on_double_tap(lambda g: dtaps.append(list(coord(*g)) + [0]))

area.on_point_down(lambda g: points.append(g.get_event().point))
area.on_point_up(lambda g: points.remove(g.get_event().point))


try:
    # Start touch gesture server in separate thread
    thread = Thread(target=driver.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:
    driver.stop()