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ノードグラフを作成するために各ノード（rect）に数値を追加しようとしましたが、アルゴリズムを適用して段階的にどのように動作するかを確認できますが、いくつかのエラーが発生します。pygame text in rectエラー
"File "test.py", line 97, in main pygame.error: font not initialized"
私は、画面の真ん中に大きな1を持っている私が正しく今もdef update(self)
from random import randrange, choice
import pygame
import sys
from pygame.locals import *
FR = 30
SIZE = 640, 480
BGCOLOR = (255,255,255)
NODECOLOR = (255,0,255)
NODESIZE = 25,25
GRIDSPACING = 50
MAXTRIES = 1000
STARTINGNODES = 4
TEXTCOLOR = (0,0,0)
BASICFONTSIZE = 20
class Graph(object):
def __init__(self):
self.nodes = set()
# record positions of each node, so that we can check for overlaps
self.positions = dict()
def add(self, node):
count = 0
added = False
# try to add node at some random location -
while not added:
x, y = (randrange(0, SIZE[0], GRIDSPACING),
randrange(0, SIZE[1], GRIDSPACING))
if not (x,y) in self.positions:
added = True
self.nodes.add(node)
node.setpos((x,y), self)
count += 1
if count >= MAXTRIES:
raise ValueError("Could not alocate space for node representation")
def update(self):
SCREEN.fill(BGCOLOR)
for node in self.nodes:
pygame.draw.rect(SCREEN, node.color, node.rect)
textSurf = BASICFONT.render(str(count), True, TEXTCOLOR)
textRect = textSurf.get_rect()
textRect.center = int(SIZE[0]/2), int(SIZE[1]/2)
DISPLAYSURF.blit(textSurf, textRect)
for neighbor in node.neighbors:
pygame.draw.line(SCREEN, NODECOLOR,node.rect.center, neighbor.rect.center)
class Node(object):
# Class variable, incremented with each
# instance so that each node has a unique ID that
# can be used as its hash:
creation_counter = 0
def __init__(self):
self.id = self.__class__.creation_counter
self.__class__.creation_counter += 1
self.rect = None
self.color = NODECOLOR
self.neighbors = set()
def setpos(self, pos, graph = None):
if self.rect and graph:
# remove self from previous position in the graph:
graph.positions.pop(self.rect.topleft, None)
self.rect = pygame.Rect(pos[0], pos[1],NODESIZE[0], NODESIZE[1])
if graph:
graph.positions[pos] = self
def __hash__(self):
return self.id
def create_graph():
# create new graph and populate nodes:
graph = Graph()
# locallist for adding neighbors:
nodes = []
print(nodes)
for i in range(STARTINGNODES):
node = Node()
graph.add(node)
return graph
def init():
global SCREEN
pygame.init()
SCREEN = pygame.display.set_mode(SIZE)
def quit():
pygame.quit()
def main():
global BASICFONT
BASICFONT = pygame.font.Font('freesansbold.ttf', BASICFONTSIZE)
graph = create_graph()
selected = None
try:
init()
while True:
graph.update()
pygame.event.pump()
# Exit the mainloop at any time the "ESC" key is pressed
if pygame.key.get_pressed()[pygame.K_ESCAPE]:
break
for event in pygame.event.get():
if event.type == pygame.MOUSEBUTTONDOWN:
x, y = event.pos
# round down x,y to multiples of NODESIZE
x -= x % NODESIZE[0]
y -= y % NODESIZE[1]
pygame.draw.rect(SCREEN, (0,0,255), (x,y) + NODESIZE)
if (x,y) in graph.positions:
node = graph.positions[x,y]
if selected:
print selected.id, node.id
if selected is node:
selected = None
node.color = NODECOLOR
elif selected not in node.neighbors:
selected.neighbors.add(node)
node.neighbors.add(selected)
else:
selected.neighbors.remove(node)
node.neighbors.remove(selected)
else:
node.color = (0,0,0)
selected = node
elif selected:
selected.setpos((x,y), graph)
elif event.type == pygame.MOUSEMOTION and event.buttons[0] and selected:
x, y = event.pos
# round down x,y to multiples of NODESIZE
x -= x % NODESIZE[0]
y -= y % NODESIZE[1]
selected.setpos((x,y), graph)
pygame.display.flip()
pygame.time.delay(FR)
finally:
quit()
if __name__ == "__main__":
main()