PyGame : The experimental gfxdraw.

This is a tutorial about gfxdraw how to use.
Note: this is an EXPERIMENTAL feature for PyGame ( meaning this API may change, or disappear in later pygame releases).
First about this gfxdraw we can use this:

• pygame module for drawing shapes
• pygame.gfxdraw.pixel — place a pixel
• pygame.gfxdraw.hline — draw a horizontal line
• pygame.gfxdraw.vline — draw a vertical line
• pygame.gfxdraw.rectangle — draw a rectangle
• pygame.gfxdraw.box — draw a box
• pygame.gfxdraw.line — draw a line
• pygame.gfxdraw.circle — draw a circle
• pygame.gfxdraw.arc — draw an arc
• pygame.gfxdraw.aacircle — draw an anti-aliased circle
• pygame.gfxdraw.filled_circle — draw a filled circle
• pygame.gfxdraw.ellipse — draw an ellipse
• pygame.gfxdraw.aaellipse — draw an anti-aliased ellipse
• pygame.gfxdraw.filled_ellipse — draw a filled ellipse
• pygame.gfxdraw.pie — draw a pie
• pygame.gfxdraw.trigon — draw a triangle
• pygame.gfxdraw.aatrigon — draw an anti-aliased triangle
• pygame.gfxdraw.filled_trigon — draw a filled trigon
• pygame.gfxdraw.polygon — draw a polygon
• pygame.gfxdraw.aapolygon — draw an anti-aliased polygon
• pygame.gfxdraw.filled_polygon — draw a filled polygon
• pygame.gfxdraw.textured_polygon — draw a textured polygon
• pygame.gfxdraw.bezier — draw a Bézier curve

Nou about the example I will use into this tutorial. Is a very simple class with an anti-aliased ellipse.
This class used pygame.gfxdraw.aaellipse , see the doc:
pygame.gfxdraw.aaellipse()
    draw an anti-aliased ellipse
      aaellipse(surface, x, y, rx, ry, color) -> None
      Draws anti aliased edges of an ellipse onto a surface.

#!/usr/bin/python

import random
import math

import pygame
from pygame.locals import *
from pygame import *
from pygame import gfxdraw

#create a math function
def linear_interp(a, b, x):
 return a*(1-x) + b*x

#a class python to show on display
class Screen():
 def __init__(self):
  pygame.init()

  self.display_flags = DOUBLEBUF
  rect = self.width, self.height = 640, 480

  if pygame.display.mode_ok(rect, self.display_flags):
   self.screen = pygame.display.set_mode(rect, self.display_flags)

 def shell_print(self,text):
  print text

 def aaellipse(self,surface, x, y, rx, ry, color):
  pygame.gfxdraw.ellipse(surface, x, y, rx, ry, color)

show = Screen()

run = 1
clock = pygame.time.Clock()

show.shell_print("test")
show.aaellipse(show.screen, x=300, y=200, rx=100, ry=60, color=(8, 8, 160))

while run:
 events = pygame.event.get()

 for event in events:
  if event.type == QUIT:
   run = 0

 pygame.display.flip()

 clock.tick(60)

To understand the class methods I used two: shell_print and aaellipse.
The shell_print is used just to print a input text to python shell.
The aaellipse take all inputs for the default pygame.gfxdraw.ellipse.
The result is a simple blue ellipse at 300 and 200 points and sized with 100 and 60.
Another aspect to note is use of the surface into show.aaellipse : show.screen.
This means that the drawing screen is used and not another defined surface.
Of course we can change Screen class to help us - decorators, other defining surfaces, initializations...

PyGame : First interface - part 7.

Today I will start with another feature: add text from the keyboard.
The interface needs to be filled with text and a good way is to read the keyboard.
My example using this feature and print the text into one row and let you erase chars when you typing.
First, you need to know I used python version 2.7.13 and the last pygame version 1.9.2.0a from here.
I used also the PyCharm version Community Edition 2017.1.3.
Let see the source code for this example:

import pygame
from pygame.locals import *

def name():
    pygame.init()
    screen = pygame.display.set_mode((480, 360))
    name = ""
    font = pygame.font.Font(None, 50)
    while True:
        for evt in pygame.event.get():
            if evt.type == KEYDOWN:
                if evt.unicode.isalpha():
                    name += evt.unicode
                elif evt.key == K_BACKSPACE:
                    name = name[:-1]
                elif evt.key == K_SPACE:
                    name = name+str(" ")
            elif evt.type == QUIT:
                return
        screen.fill((0, 0, 0))
        block = font.render(name, True, (255, 255, 255))
        rect = block.get_rect()
        rect.center = screen.get_rect().center
        screen.blit(block, rect)
        pygame.display.flip()

if __name__ == "__main__":
    name()

The result of this python script can see into image below:

PyGame : Fix error install pygame module on python 3.4.

Today I started to install pygame with python 3.4.1.
I got a lot of errors first with pip tool, see all errors.

C:\Python34\Scripts>pip install pygame
Downloading/unpacking pygame
  Running setup.py (path:C:\Users\mythcat\AppData\Local\Temp\pip_build_mythcat\

pygame\setup.py) egg_info for package pygame


    WARNING, No "Setup" File Exists, Running "config.py"
    Using WINDOWS configuration...

    Path for SDL not found.
    Too bad that is a requirement! Hand-fix the "Setup"
    Path for FONT not found.
    Path for IMAGE not found.
    Path for MIXER not found.
    Path for PNG not found.
    Path for JPEG not found.
    Path for PORTMIDI not found.
    Path for COPYLIB_tiff not found.
    Path for COPYLIB_z not found.
    Path for COPYLIB_vorbis not found.
    Path for COPYLIB_ogg not found.

    If you get compiler errors during install, doublecheck
    the compiler flags in the "Setup" file.


    Continuing With "setup.py"
    Error with the "Setup" file,
    perhaps make a clean copy from "Setup.in".
    Traceback (most recent call last):
      File "", line 17, in 
      File "C:\Users\mythcat\AppData\Local\Temp\pip_build_mythcat\pygame\setup.py", line 165, in 
        extensions = read_setup_file('Setup')
      File "C:\Python34\lib\distutils\extension.py", line 164, in read_setup_file
        line = expand_makefile_vars(line, vars)
      File "C:\Python34\lib\distutils\sysconfig.py", line 423, in expand_makefile_vars
        s = s[0:beg] + vars.get(m.group(1)) + s[end:]
    TypeError: Can't convert 'NoneType' object to str implicitly
    Complete output from command python setup.py egg_info:

WARNING, No "Setup" File Exists, Running "config.py"

Using WINDOWS configuration...

Path for SDL not found.

Too bad that is a requirement! Hand-fix the "Setup"

Path for FONT not found.

Path for IMAGE not found.

Path for MIXER not found.

Path for PNG not found.

Path for JPEG not found.

Path for PORTMIDI not found.

Path for COPYLIB_tiff not found.

Path for COPYLIB_z not found.

Path for COPYLIB_vorbis not found.

Path for COPYLIB_ogg not found.

If you get compiler errors during install, doublecheck

the compiler flags in the "Setup" file.

Continuing With "setup.py"

Error with the "Setup" file,

perhaps make a clean copy from "Setup.in".

Traceback (most recent call last):

  File "", line 17, in 

  File "C:\Users\mythcat\AppData\Local\Temp\pip_build_mythcat\pygame\setup.py", line 165, in 

    extensions = read_setup_file('Setup')

  File "C:\Python34\lib\distutils\extension.py", line 164, in read_setup_file

    line = expand_makefile_vars(line, vars)

  File "C:\Python34\lib\distutils\sysconfig.py", line 423, in expand_makefile_vars

    s = s[0:beg] + vars.get(m.group(1)) + s[end:]

TypeError: Can't convert 'NoneType' object to str implicitly

----------------------------------------
Cleaning up...
Command python setup.py egg_info failed with error code 1 in C:\Users\mythcat\AppData\Local\Temp\pip_build_mythcat\pygame
Storing debug log for failure in C:\Users\mythcat\pip\pip.log

C:\Python34\Scripts>pip install pygame-1.9.3-cp34-cp34m-win_amd64.whl
pygame-1.9.3-cp34-cp34m-win_amd64.whl is not a supported wheel on this platform.
Storing debug log for failure in C:\Users\mythcat\pip\pip.log

C:\Python34\Scripts>pip3 install pygame-1.9.3-cp34-cp34m-win_amd64.whl
pygame-1.9.3-cp34-cp34m-win_amd64.whl is not a supported wheel on this platform.
Storing debug log for failure in C:\Users\mythcat\pip\pip.log

The solution come with the executable pygame-1.9.2a0-hg_8d9e6a1f2635%2B.win-amd64-py3.4.msi from here and now working very well.

PyGame : How play ogg file.

Let's see how to play file.ogg file with pygame python module.

import pygame
import time
pygame.init()
pygame.mixer.music.load('file.ogg')
pygame.mixer.music.play()
time.sleep(1.5)

PyGame : Effects - part 003.

This is a part 003 from pygame tutorial series and is a little more advanced for you.
The reason comes with get_palette and set_palette functions and gif image with 8 bits.
Of course, I could use pygame.PixelArray but is not the purpose of this tutorial.
The python script comes with one surface screen, one surface for image and also one surface of a blur.
I set the resolution to be sized at 640,480. I have motion vectors for two directions and with this I make a circle follow path from sin and cos.
The path come from x and y variables ( width and height).
With angle_xd and angle_yd I increment the angles.
This is the result:
This is the source code:

import pygame, pygame.transform, pygame.image
from pygame.surfarray import *
from pygame.locals import *
from numpy import *
resolution  = array((640,480))
PI  = 3.14159
DEG2RAD = PI/180
print resolution[0], resolution[1]

def main():
    
    pygame.init()

    screen = pygame.display.set_mode(resolution,0,8)
    sprite = pygame.image.load("test_random.gif")
    sprite.set_palette(sprite.get_palette())
    sprite.set_colorkey((255,255,255))
    screen.set_palette(sprite.get_palette())
    area_work = pygame.Surface(resolution,0,8)
    area_work.set_palette(sprite.get_palette())

    angle_xd = 0
    angle_yd = 0
    
    while 1:

        for e in pygame.event.get():
            if e.type in (QUIT,KEYDOWN,MOUSEBUTTONDOWN):
                return
        x    = ((resolution[0])/5)*cos((angle_xd*DEG2RAD))+((resolution[0])/2-128)
        print x
        y    = ((resolution[1])/5)*sin((angle_yd*DEG2RAD))+((resolution[1])/2-128)
        angle_xd  += 1
        angle_yd  += 1
        area_work = pygame.transform.scale(screen, (resolution[0]+8,resolution[1]+8))
        tmp = pygame.surfarray.array2d(area_work)
        blur = array(tmp)
        blur[1:,:]  += tmp[:-1,:]*32
        blur[:-1,:] += tmp[1:,:]*32
        blur[:,1:]  += tmp[:,:-1]*32
        blur[:,:-1] += tmp[:,1:]*32
        blur /= 31
        blit_array(screen, blur[8:resolution[0]+32,8:resolution[1]+32])
        screen.blit(sprite,(x,y))
 pygame.display.update()

if __name__ == '__main__': main()

PyGame : Effects - part 002.

This is another tutorial about pygame and python 2.7 is very simple.
I make this tutorial for educational purposes for the children versus python language.
I used for most common variables the Romanian language and this will allow you to understand well the variables versus python language script.
I used this version of python:

C:\Python27>python.exe
Python 2.7.8 (default, Jun 30 2014, 16:08:48) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>

This python script comes with few functions:

Imagine_hasurata - fill the image 

ImaginePicatura - draw drop

Pregatire - setup drawing

I let rect variable for python pygame sprite.py ( need to be set the name to rect from rectangle).
Also, I have two python class to make the drop and trail drop into the screen.

This is the effect result:

This is the python script:

#! /usr/bin/env python
import pygame, random
from pygame.locals import *

aleator = 1.5
ecran_x = 640
ecran_y = 480
acceleratie = 1.0
marime_picatura = (3, 3)
culoare_start = 255
culoare_stop = 0
culoare_intre = 2

def Imagine_hasurata(f, i):
    lungime = f - i + 1
    interval = (culoare_start - culoare_stop) / (culoare_intre + 1)
    imagini = []
    for x in range(culoare_intre):
        image = pygame.Surface((1, lungime)).convert()
        color = culoare_start - (x + 1)*interval
        image.fill((color, color, color))
        imagini.append(image)
    return imagini

def ImaginePicatura():
    image = pygame.Surface(marime_picatura).convert()
    image.fill((culoare_start, culoare_start, culoare_start))
    return image

def Pregatire(Picatura, trasa):
    y = 0.0
    v = 0.0
    ylist = []
    while int(y) <  ecran_y:
        ylist.insert(0, int(y))
        v = v + acceleratie
        y = y + v
    Picatura.ylist = ylist[:]
    ylist.insert(0, ecran_y)
    trasa.imageset = []
    for i in range(len(ylist) - 1):
        trasa.imageset.insert(0, Imagine_hasurata(ylist[i], ylist[i + 1]))

class Picatura(pygame.sprite.Sprite):
    def __init__(self, x):
        pygame.sprite.Sprite.__init__(self, self.updategroup, self.displaygroup)
        self.rect = self.image.get_rect()
        self.rect.centerx = x
        self.trasaindex = 0
        self.ynum = len(self.ylist)
    def update(self):
        self.ynum = self.ynum - 1
        if self.ynum < 0:
            self.kill()
        else:
            self.rect.centery = self.ylist[self.ynum]
            Trasare(self, self.trasaindex)
            self.trasaindex = self.trasaindex + 1

class Trasare(pygame.sprite.Sprite):
    def __init__(self, Picatura, trasaindex):
        pygame.sprite.Sprite.__init__(self, self.updategroup)
        self.imagini = self.imageset[trasaindex]
        self.rect = self.imagini[0].get_rect()
        self.rect.midtop = Picatura.rect.center
        self.update = self.start
    def start(self):
        self.add(self.displaygroup)
        self.update = self.fade
        self.imagenum = 0
        self.fade()
    def fade(self):
        if self.imagenum == len(self.imagini):
            self.kill()
        else:
            self.image = self.imagini[self.imagenum]
            self.imagenum = self.imagenum + 1

def main():
    pygame.init()
    ecran = pygame.display.set_mode((ecran_x, ecran_y))
    fundal = pygame.Surface(ecran.get_rect().size)

    updategroup = pygame.sprite.Group()
    displaygroup = pygame.sprite.RenderUpdates()

    Picatura.image = ImaginePicatura()
    Pregatire(Picatura, Trasare)

    for thing in [Picatura, Trasare]:
        thing.updategroup = updategroup
        thing.displaygroup = displaygroup

    ceas = pygame.time.Clock()

    while 1:

        for event in pygame.event.get():
            if event.type == QUIT:
                return

        displaygroup.clear(ecran, fundal)
        updategroup.update()

        if random.random() < aleator:
            Picatura(random.randrange(ecran_x))

        pygame.display.update(displaygroup.draw(ecran))
        ceas.tick(10)

if __name__ == '__main__':
    main()

PyGame : Effects - part 001.

Today I come one simple and nice tutorial about pygame python module over python version 3.4.
The python script just makes two effects.
First is one fade effect from transparent to black. I also added one green color.
Another effect come with the dizzy star base math python module and random python module.
Because this combined colors green and blue are funny I make star blue.
The script is simple :

• created variables;
• make pygame windows; 
• make fade background function;
• make one class for shape ( and this can be updated );
• make loop the game and escape key option;
•  ... and finally, add shape class and variable into loop pygame script.

Let's see the script:

# Cătălin George Feștilă 
# http://free-tutorials.org

import pygame
import random
import math
from pygame.locals import *

#initialize pygame and random seed
pygame.init()
random.seed()

#transparent to black for fade effect
def background_fade():
    rec = pygame.Surface(screensize)
    if frame != 0:
        rec.set_alpha(10)
        rec.fill((0,0,0))
    else:
        rec.set_alpha(255)
        rec.fill(draw_color)
    screen.blit(rec,(0,0))
    del rec

#all mathmatical shapes
class shape():
    xy = [0,0]   #location
    rot = [0.0,0.0] #rotation
    color = '.'   #color/shape value
    dim_size = 1
 #constructor
    def __init__(self,xy,dim_size,color):
        self.xy = xy
        self.dim_size = dim_size
        
        self.rot = [(random.random()*(math.pi)),.002]
        self.color = color
 
 #define shape
    def set_shape(self,color):
        self.color = color
    
 #draw shape    
    def draw(self):
        #rotation
        self.rot[0] += self.rot[1]
        if self.rot[0] > math.pi*2:
            self.rot[0] -= math.pi*2
        #blue/star
        if self.color == 'blue':
            for x in range(5):
                pygame.draw.aaline(screen,(0,0,255),\
                        (((math.cos(self.rot[0]+(x*((math.pi*2)/5)))*self.dim_size)+self.xy[0]),\
                        ((math.sin(self.rot[0]+(x*((math.pi*2)/5)))*self.dim_size)+self.xy[1])),\
                        (((math.cos(self.rot[0]+((x+2)*((math.pi*2)/5)))*self.dim_size)+self.xy[0]),\
                        ((math.sin(self.rot[0]+((x+2)*((math.pi*2)/5)))*self.dim_size)+self.xy[1])),\
                        1)

#start main pygame effect
while 1:
    #create variable for pygame
    screensize = (640,480)
    screen = pygame.display.set_mode(screensize, 0, 32)
    clock = pygame.time.Clock()
    #set frame 
    frame = 0
    draw_color = [0,255,0]
    #reftime = pygame.time.get_ticks()
    text = pygame.font.Font(None,25)
    #start drawing
    while 1:
        clock.tick(30)
        shapetest=shape((320,240),100,'blue')
        shapetest.draw()
        #check if is pressed any key 
        pygame.event.get()
        #if is press escape key
        if pygame.key.get_pressed()[pygame.K_ESCAPE]:
            pygame.quit()
            exit()
        #print clock.get_fps() on windows title
        pygame.display.set_caption(str(clock.get_fps()))   
        pygame.display.update()
        #start fade background
        background_fade()
        #change var frame for background_fade
        frame += 1
        #stop when frame is 100
        if frame == 100:
         break

    frame = 0
    
    pygame.display.update()
    background_fade()

    frame += 1

I make one screenshot to see how it's working.