ARtyProg: 2016

Saturday, September 17, 2016

Getting Started with ASP.NET Core

Nice introduction from Microsoft

https://docs.asp.net/en/latest/getting-started.html

Friday, September 2, 2016

CURIO and Websocketd

Quote from site :

Curio is a library for performing concurrent I/O and common system programming tasks such as launching subprocesses and farming work out to thread and process pools. It uses Python coroutines and the explicit async/await syntax introduced in Python 3.5. Its programming model is based on cooperative multitasking and existing programming abstractions such as threads, sockets, files, subprocesses, locks, and queues. You'll find it to be small and fast. https://github.com/dabeaz/curio

websocketd
Full duplex messaging between web browsers and servers

run the bellow python script 'ls.py' with the following command :
./websocketd --port=8080 python ls.py

In an html page put the folowing code
and in the web browser console enter for example: ws.send('ls /home')

<!DOCTYPE html>
<html>
  <head>
    <title>websocketd unix command example</title>
    <style>
      #count {
        font:  16px arial;
        margin: auto;
        color: #00FF00;
      }
    </style>
  </head>
  <body>
    <div style="color: #fff;">Python Terminal</div>
    <div id="count" style="height:500px; overflow:auto; border:1px solid black;"></div>

    <script>
      data = []

      function clearDiv() {
        var div = document.getElementById('count');
        div.innerHTML = "";
      }

      var ws = new WebSocket('ws://localhost:8080'  + "/");
      data = []
      ws.onopen = function() {
        document.body.style.backgroundColor = '#000';
      };
      ws.onclose = function() {
        document.body.style.backgroundColor = null;
      };
      ws.onmessage = function(event) {
        data = []
        data.push(event.data)
        document.getElementById('count').innerHTML = data[0];
        console.log(data.length)
      };
    </script>

  </body>
</html>

ls.py (modified version from the examples site)

import curio
from sys import stdout
from curio import subprocess


async def main():
    while True:
        data = b""
        path = input()
        p = subprocess.Popen(["ls", "-rtl", path], stdout=subprocess.PIPE, bufsize=1)
        async for line in p.stdout:
            data += line
        print(data.decode('UTF-8').replace('\n','<br />'))
        stdout.flush()

curio.run(main())

Monday, June 27, 2016

GFK - Memory

Fist game draft : Memory.

This is the first game created with Transcrypt and Hexi.
Feel free to comment, if you want precisions on installation.

# memory.py
# This file is translated to Javascript using Transcrypt
rgb2hex = JS.rgb2hex
color1 = rgb2hex("rgba(255,0,0,0)")
color2 = rgb2hex("rgba(255,255,0,0)")
color3 = rgb2hex("rgba(255,255,255,0)")
color4 = rgb2hex("rgba(255,0,255,0)")
color5 = rgb2hex("rgba(255,80,80,0)")
color6 = rgb2hex("rgba(255,128,0,0)")
color7 = rgb2hex("rgba(255,128,255,0)")
color8 = rgb2hex("rgba(255,0,128,0)")

colors = [color1,color2, color3, color4, color5, color6, color7, color8]
allcolors = [color for  tuplecolor in zip(colors, colors) for color in tuplecolor]
JS.shuffle(allcolors)

# Helper Functions:
def all(iterable):
    for element in iterable:
        if not element:
            return False
    return True

# Main Grid wich contents all the cells
# Grille principale contenant les cellules
class Grid:
    def __init__(self, game, rows=4,  cols=4):
        self.offset = 4
        self.game = game
        self.rows = rows
        self.cols = rows
        self.ligs = [[0 for i in range(self.rows)] for j in range(self.cols)]
        self.spr = [[0 for i in range(self.rows)] for j in range(self.cols)]

    def  display(self):
        numcells = self.rows * self.cols
        cells = range(16)
        JS.shuffle(cells)
        JS.shuffle(colors)
        for num in cells:
            color = allcolors[num]
            i, j = num % self.cols, num // self.rows
            posx, posy  = i *(128  + self.offset ), j * (128  + self.offset ) 

            # FrontFace : Sprite or Color
            sprite = self.game.rectangle(128, 128, color)
            sprite.x = posx
            sprite.y = posy
            sprite.num = num
            sprite.content  = color
            sprite.showed = False

            # Backface 
            rectb = self.game.rectangle(128, 128, "blue")
            rectb.x = posx
            rectb.y = posy
            rectb.num = num
            self.ligs[i][j] = rectb
            self.spr[i][j] = sprite


# Game Handler
# Gestion du Jeu                                     
class Memory:
    def __init__(self, width=512, height=512):
        self.game = hexi(width, height, self.setup)
        self.game.backgroundColor = "seagrean"
        self.mouse = self.game.pointer
        self.mouse.tap = self.tap
        self.grid = Grid(self.game)
        self.curcell = None
        self.clickedcells = []

    def tap(self):
        self.tapped = True

    def setup(self):        
        self.game.scaleToWindow("seaGreen")
        self.grid.display() 
        self.game.state = self.play

    def get_curcell(self):
        for i in range(self.grid.rows):
            for j in range(self.grid.cols):
                curcell = self.grid.ligs[i][j]
                if(self.game.hit(self.game.pointer, curcell)):
                    self.curcell = curcell      

    def compare_cells(self):

        if len(self.clickedcells) < 2:
            return

        numrows = self.grid.rows
        numcols = self.grid.cols 

        def resetcell(cells):
            def _reset():
                cells[0].alpha = 1
                cells[1].alpha = 1
                self.clickedcells = []
            return _reset 

        cella, cellb = self.clickedcells[:2]
        if (cella.num != cellb.num ):                
                icella, jcella = cella.num % numcols, cella.num // numrows
                icellb, jcellb = cellb.num % numcols, cellb.num // numrows
                spritea = self.grid.spr[icella][jcella]
                spriteb  = self.grid.spr[icellb][jcellb]
                contenta = spritea.content 
                contentb = spriteb.content                     
                cellb.alpha = 0
                cella.alpha = 0                     
                if (contenta != contentb):
                    setTimeout(resetcell([cella, cellb]), 1000)
                else:
                    spritea.showed = True
                    spriteb.showed = True
                    self.clickedcells = []


    def check_endgame(self):
        # flatten liste sprites
        # On 'applatit la liste des sprites'
        lst_spr = [sprite for liste_sprites in self.grid.spr for sprite in liste_sprites]
        showed_values = [s.showed for s in lst_spr]
        if (all(showed_values)):
            for s in lst_spr:
                s.alpha = 0
            self.game.state = self.end 

    def play(self):
        self.check_endgame()     
        self.get_curcell()

        if (self.mouse.tapped): 
            lc = len(self.clickedcells)
            if (lc >= 2):
                alert("TOO FAST")
            self.clickedcells.append(self.curcell)           
            self.mouse.tapped = False
            self.compare_cells()

    def start(self):
        self.game.start()

    def end(self):
        console.log("END")

memory = Memory()
memory.start()

Games For Kids - GFK

I have just created a new repository named GFK like Games For Kids on Github.

Transcrypt is translate Python to Javascript. The Javascript resulting is clean and readable.
Hexi is Game library based on PixiJS

Tuesday, March 1, 2016

Java File Upload Example with Servlet 3.0 API

Here is a sample on using new built-in FileUpload API

http://www.codejava.net/java-ee/servlet/java-file-upload-example-with-servlet-30-api

Links - Pages