# Graph Sim

Thinking of graphs – especially bar graphs – as a pretty piece of art I wanted to create something related. But due to me not having any data I could graph, I decided to just use randomly generated data. It has no real purpose rather than look good.

#### Some math

• All of these calculations are based on random.randint() being perfectly random. Due to it being pseudo-random this will just be an approximation. To get further information, click on the equation to view them in Wolfram Alpha.
• The chance of the screen not showing anything
• $(\text{which means every bar has the background color})$
• $(\text{max. quantity of bars on screen} = \frac{\text{window height}}{\text{bar width}} = \frac{720}{4} = 180)$
• Although these probabilities are very unlikely, they – theoretically – could occur.

# Python 2.7.7 Code
# Pygame 1.9.1 (for Python 2.7.7)
# Jonathan Frech 13th of May, 2015

# gets the scaled mouse position
def getMousePos():
p = pygame.mouse.get_pos()
return [
p[0] / main.SCALE, p[1] / main.SCALE
]

# gets the distance between two points
def getDistance(p1, p2):
return int(
math.sqrt((p2[0] - p1[0])**2 + (p2[1] - p1[1])**2)
)

# validates color integer
# extra feature: _min and _max implementation
def colorValid(_color, _min = 0, _max = 255):
newColor = math.fabs(_color)
n = _max - _min
if newColor > n:
if int(newColor / n) % 2 == 0:
newColor = newColor % n
else:
newColor = n - (newColor % n)

return int(newColor) + _min

# gets the position on a circle
# circle center                           : '_pos'
# angle from center to point on the circle: '_angle'
return [
]

# swaps a boolean
def boolSwap(_bool):
if _bool:
return False
else:
return True

# tick function
def tick():
# handle events
for event in pygame.event.get():
# quit
if event.type == pygame.QUIT:
sys.exit()

# keyup
if event.type == pygame.KEYUP:
# handle 'main.KEYSDOWN'
if event.key in main.KEYSDOWN:
main.KEYSDOWN.remove(event.key)

# keydown
if event.type == pygame.KEYDOWN:
# handle 'main.KEYSDOWN'
if event.key not in main.KEYSDOWN:
main.KEYSDOWN.append(event.key)

if main.TICKS % 1 == 0:
main.GRAPH.append(
[random.randint(0, main.HEIGHT), [random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)]]
)

# cap off max number of bars (for better performance)
while len(main.GRAPH) > main.WIDTH / main.GRAPHWIDTH + 1:
main.GRAPH.pop(0)

# render function
def render():
# fill
main.SCREEN.fill(main.BACKGROUNDCOLOR)
if main.FILL:
main.SURF.fill(main.COLOR)

# render bars
for _ in range(0, len(main.GRAPH)):
p = [
_*main.GRAPHWIDTH,
main.GRAPH[_][0],

main.GRAPHWIDTH,
main.HEIGHT
]
pygame.draw.rect(main.SURF, main.GRAPH[_][1], p)

# blit and flip
main.SCREEN.blit(pygame.transform.scale(main.SURF, [int(main.WIDTH * main.SCALE), int(main.HEIGHT * main.SCALE)]), [0, 0])
pygame.display.flip()

# run function (uses tick() and render())
def run():
ticksPerSecond = 60
lastTime = time.time() * 1000000000
nsPerTick =  1000000000.0 / float(ticksPerSecond)

ticks = 0
frames = 0

lastTimer = time.time() * 1000
delta = 0.0

while True:
now = time.time() * 1000000000
delta += float(now - lastTime) / float(nsPerTick)
lastTime = now
shouldRender = False

while delta >= 1:
ticks += 1
main.TICKS += 1
tick()
delta -= 1
shouldRender = True

if shouldRender:
frames += 1
render()

if time.time() * 1000 - lastTimer >= 1000:
lastTimer += 1000

# debug
#print("Frames: " + str(frames) + ", ticks: " + str(ticks))

frames = 0
ticks = 0

# dummy class for global variables
class dummy():
pass

# importing needed modules
import pygame, sys, time, math, os, random

# main dummy
main = dummy()
main.TICKS = 0

main.RES = 1
main.WIDTH = 1080 / main.RES
main.HEIGHT = 720 / main.RES
main.SIZE = [main.WIDTH, main.HEIGHT]
main.CENTER = [main.WIDTH / 2, main.HEIGHT / 2]
main.CENTERFLOAT = [main.WIDTH / 2.0, main.HEIGHT / 2.0]

main.SCALE = 1 * main.RES
main.SCALEDSIZE = [int(main.WIDTH * main.SCALE), int(main.HEIGHT * main.SCALE)]
main.SCALEDSIZEFLOAT = [main.WIDTH * main.SCALE, main.HEIGHT * main.SCALE]

main.SURF = pygame.Surface(main.SIZE)

main.SCREEN = pygame.display.set_mode(main.SCALEDSIZE)
pygame.display.set_caption("Graph Sim")

main.BACKGROUNDCOLOR = [0, 0, 0]
main.COLOR = [150, 0, 0]
main.FILL = True

main.KEYSDOWN = []

main.GRAPH = []
main.GRAPHWIDTH = 4

# start program
run()