#!/usr/bin/python

import sys
import sdl2.ext

if len(sys.argv) == 1:
    print ("Usage: imv <filename>")
    sys.exit(0)

sdl2.ext.init()


factory = sdl2.ext.SpriteFactory(sdl2.ext.SOFTWARE)
sprite = factory.from_image(sys.argv[1])

rw,rh = sprite.size
w = rw
h = rh
if w > 640:
    w = 640
if h > 480:
    h = 480

window = sdl2.ext.Window(sys.argv[1], size=(w, h))
window.show()

spriterenderer = factory.create_sprite_render_system(window)
spriterenderer.render(sprite)

movspeed = 30
lastx = 0
lasty = 0
def move(x,y):
    global lastx
    global lasty
    lastx = lastx + x * movspeed
    lasty = lasty + y * movspeed

    if lastx > 0:
        lastx = 0
    if lasty > 0:
        lasty = 0
    if rh + lasty - h < 0:
        lasty = h - rh
    if rw + lastx - w < 0:
        lastx = w - rw

    sprite.x = lastx
    sprite.y = lasty
    spriterenderer.render(sprite)

running = True
while running:
    events = sdl2.ext.get_events()
    for event in events:
        if event.type == sdl2.SDL_QUIT:
            running = False
            break
        if event.type == sdl2.SDL_KEYDOWN:
            if event.key.keysym.sym == sdl2.SDLK_UP:
                move(0, 1)
            elif event.key.keysym.sym == sdl2.SDLK_DOWN:
                move(0, -1)
            elif event.key.keysym.sym == sdl2.SDLK_LEFT:
                move(1, 0)
            elif event.key.keysym.sym == sdl2.SDLK_RIGHT:
                move(-1, 0)
            sdl2.SDL_Delay(10)


sdl2.ext.quit()