Hello World!

12 Days of Python – Day 3

Welcome to Day 3 of the 12 Days of Python.  This is the third in a series of posts where we will use Python and the Pygame module to draw a Christmas scene.  Each day we’ll add something else to the scene, and we’ll show a new aspect of Python or Pygame.  We’re also having a giveaway, where you can win a Kindle Touch!

On Day 1, we made a Pygame window and used the Pygame draw functions to draw Santa using lines circles and polygons.  On Day 2, we made Santa’s arm wave.

For Day 3 we’re going to add a calendar to the scene.  We draw the calendar using a white rectangle, some lines, and a bunch of Pygame font objects for the text and numbers.  We use a for loop to draw the days of the calendar.

# santa_3.py
# This is the code for Day 3 of "12 Days of Python",
# by the authors of "Hello World! Computer Programming for Kids and Other Beginners".

import pygame, sys, math

def rotatePointAroundCenter(point, center, degrees):
    displacement = (point[0] - center[0], point[1] - center[1])
    radians = math.radians(degrees)
    newPoint = [0,0]
    newPoint[0] = displacement[0] * math.cos(radians) + displacement[1] * math.sin(radians)
    newPoint[1] = displacement[1] * math.cos(radians) - displacement[0] * math.sin(radians)
    return newPoint

pygame.init()

pygame.display.set_caption("12 Days of Python")

screen = pygame.display.set_mode((640,480))
santa = pygame.surface.Surface((640,480)).convert_alpha()
santa.fill((0,0,0,0))
screen.fill((0,0,0))

santasArm = pygame.surface.Surface((640,480)).convert_alpha()
santasArm.fill((0,0,0,0))

calendar = pygame.surface.Surface((189,150))
calendar.fill((255,255,255))

#---CALENDAR DRAW
for i in range(0, 189, 27):
    pygame.draw.line(calendar, (0,0,0), (i,30), (i,150), 2)
for i in range(30, 151, 24):
    pygame.draw.line(calendar, (0,0,0), (0, i), (189, i), 2)

cal_head_font = pygame.font.Font(None, 26)
cal_head_surface = cal_head_font.render("DECEMBER", True, (0,0,0))
cal_head_rect = cal_head_surface.get_rect()
cal_head_rect.center = (94.5, 15)

cal_num_font = pygame.font.Font(None, 20)

for i in range(1,32):
    cal_num_surface= cal_num_font.render(str(i), True, (0,0,0))
    cal_num_rect = cal_num_surface.get_rect()
    cal_num_rect.center = (((i+3) % 7 * 27) + 13.5,((i+3) // 7 * 24) + 42)
    calendar.blit(cal_num_surface, cal_num_rect)

calendar.blit(cal_head_surface, cal_head_rect)
#---L ARM DRAW
pygame.draw.polygon(santasArm,(255,0,0),((274,207),(264,197),(243,182),(226,168),
                    (215,154),(212,153),(206,158),(192,155),(183,157),
                    (182,172),(204,190),(219,208),(244,231),(261,245))) #arm n hand
pygame.draw.polygon(santasArm, (255,255,255),((243,182),(242,176),(231,167),
                    (226,168),(218,181),(204,190),(204,200),(212,208),
                    (219,208),(232,197))) #arm fur
santasRotArm = santasArm.subsurface(pygame.rect.Rect((182,153),(92, 92)))

#---R ARM DRAW
pygame.draw.polygon(santa,(255,0,0),((358,191),(405,202),(428,207),(448,212),
                    (457,220),(459,226),(457,232),(444,236),(440,243),(421,237),
                    (399,233),(389,233),(344,236))) #arm n hand
pygame.draw.polygon(santa,(255,255,255),((428,207),(418,197),(406,197),
                    (407,204),(400,215),(401,237),(421,238),(421,223))) #arm fur
#---L LEG DRAW
pygame.draw.polygon(santa,(255,0,0),((270,323),(268,345),(266,352),(305,361),
                    (309,352),(317,326),(319,312),(272,306))) #leg
pygame.draw.polygon(santa,(102,68,34),((301,370),(266,361),(247,356),(231,357),
                    (224,368),(227,380),(245,388),(272,386),(274,390),(295,391))) #boot
pygame.draw.polygon(santa,(255,255,255), ((301,370),(312,355),(303,352),(293,348),
                    (279,346),(268,342),(263,343),(266,361))) #fur
#---R LEG DRAW
pygame.draw.polygon(santa,(255,0,0),((322,326),(330,352),(331,359),(372,350),
                            (369,323),(367,311),(316,314))) #leg
pygame.draw.polygon(santa, (102,68,34),((340,369),(373,361),(396,356),(410,359),
                    (415,375),(400,387),(366,386),(365,392),(347,393),(340,386))) #boot
pygame.draw.polygon(santa,(255,255,255),((373,361),(340,369),(334,368),(326,353),
                    (345,348),(359,347),(375,343)))
#---BODY DRAW
pygame.draw.polygon(santa, (255,255,255), ((234,289),(226,299),(230,316),
                    (281,322),(304,327),(317,326),(333,322),(363,324),
                    (408,304),(410,287),(402,275),(328,208),(281,207))) #vest fur
pygame.draw.polygon(santa, (255,0,0), ((271,188),(245,231),(236,259),(234,272),
                    (235,287),(241,295),(294,302),(300,298),(304,285),
                        (298,217))) #vest 1
pygame.draw.polygon(santa, (255,0,0), ((326,235),(328,286),(330,295),(335,300),
                    (369,297),(401,277),(389,234),(357,192),(334,197))) #vest 2

pygame.draw.circle(santa,(0,0,0),(315,243),4)
pygame.draw.circle(santa,(0,0,0),(314,257),4)
pygame.draw.circle(santa,(0,0,0),(315,274),4)
pygame.draw.circle(santa,(0,0,0),(317,293),4)
#---HEAD DRAW
pygame.draw.polygon(santa, (255,255,255),((278,153),(272,188),
                    (281,211),(300,232),(315,238),(326,232),(346,215),(357,191),
                    (351,151),(278,153))) #beard
pygame.draw.polygon(santa, (255, 218, 185),((282,151),(283,166),(309,178),
                    (315,179),(321,177),(345,166),(346,152),(335,140),(310,133),
                    (289,141))) #head
pygame.draw.polygon(santa, (255,0,0),((266,139),(278,123),
                    (293,112),(315,110),(343,115),(312,85),(260,134))) #hat main
pygame.draw.polygon(santa,(255,255,255),((346,152),(335,140),(310,133),
                    (289,141),(282,151),(270,150),(261,146),(266,139),(278,123),
                    (293,112),(315,110),(343,115),(357,132))) #hat rim
pygame.draw.circle(santa,(255,255,255),(255,149),15) #hat ball
pygame.draw.circle(santa,( 50, 50, 50),(307,151),3) #eye
pygame.draw.circle(santa,( 50, 50, 50),(319,151),3) #eye
pygame.draw.polygon(santa,(255,255,255),((310,140),(301,141),(294,145),(294,149),
                    (303,145),(309,144))) #eyebrow
pygame.draw.polygon(santa,(255,255,255),((315,146),(324,146),(330,150),(331,146),
                    (326,142),(317,140))) #eyebrow
pygame.draw.polygon(santa,(255,255,255),((283,167),(287,177),(296,182),(311,176),
                    (305,169),)) #mustachelet
pygame.draw.polygon(santa,(255,255,255),((344,168),(323,166),(319,176),(336,178))) #mustachelet
pygame.draw.lines(santa, (0,0,0), False, ((307,165),(307,169),(310,173),(321,171),(322,164)),2) #nose
counter = 0
clock = pygame.time.Clock()
while 1:
    clock.tick(30)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
    screen.fill((0,0,0))
    #screen.blit(santasArm, (0,0))
    rotatedArm = pygame.transform.rotate(santasRotArm,math.sin(counter/5.0)*10-7)
    rotArmRect = rotatedArm.get_rect()
    rotArmPos = rotatePointAroundCenter((86,73),santasRotArm.get_rect().center,-math.sin(counter/5.0)*10+7)
    rotArmPos[0] += 190
    rotArmPos[1] += 180
    rotArmRect.center = rotArmPos
    screen.blit(calendar, (400, 20))
    screen.blit(rotatedArm, rotArmRect)
    screen.blit(santa, (0,0))
    pygame.display.flip()
    counter += 1

Here’s what it looks like when you run it:

To try the code out yourself, you can cut-and-paste it from the code window above into your favorite Python editor.

On Day 4, we’ll add some code that crosses off the calendar days.

Warren & Carter