我已经走到了死胡同，经过过度的(和不成功的)谷歌搜索，我需要帮助。

我正在构建一个简单的PyQt4小部件，它位于60x80个正方形的网格中，每个都初始化为None。如果用户单击该框，则会根据此列表定义的左键单击次数更改颜色：self.COLORS=[

(0, 0, 255), #WATER

(255, 210, 128), #SAND

(0, 128, 0), #GREEN

(255, 255, 0), #YELLOW

(255, 165, 0), #ORANGE

(255, 0, 0) #RED

]

如果用户右键单击，它将使用通用的递归泛洪填充算法对区域进行泛洪填充。这对小空间非常有效，但是如果空间足够大，程序会失败，并出现错误Fatal Python error: Cannot recover from stack overflow.我不知道如何解决这个问题，可能是一个不递归的洪水填充？

所有方块和随后的颜色代码都存储在self.cells中，因此通过设置self.cells[(y,x)]=1可以将单元格(y,x)设置为Sand颜色。

这是整个节目。import sys

from PyQt4 import QtGui, QtCore

class Example(QtGui.QWidget):

def __init__(self, cell_size=10, swidth=800, sheight=600):

QtGui.QWidget.__init__(self)

self.resize(swidth,sheight)

self.cell_size = cell_size

self.height = sheight

self.width = swidth

self.columns = self.width // self.cell_size

self.rows = self.height // self.cell_size

self.COLORS=[

(0, 0, 255), #WATER

(255, 210, 128), #SAND

(0, 128, 0), #GREEN

(255, 255, 0), #YELLOW

(255, 165, 0), #ORANGE

(255, 0, 0) #RED

]

self.cells = {(x,y):None for x in range(1,self.columns+1) for y in range(1,self.rows+1)}

def translate(self,pixel_x, pixel_y):

"Translate pixel coordinates (pixel_x,pixel_y), into grid coordinates"

x = pixel_x * self.columns // self.width + 1

y = pixel_y * self.rows // self.height + 1

return x,y

def check_cell(self,x,y):

if self.cells[(x,y)] <= 0:

self.cells[(x,y)]=0

elif self.cells[(x,y)] >= len(self.COLORS)-1:

self.cells[(x,y)]=len(self.COLORS)-1

else:

pass

def draw_cell(self, qp, col, row):

x1,y1 = (col-1) * self.cell_size, (row-1) * self.cell_size

x2,y2 = (col-1) * self.cell_size + self.cell_size, (row-1) * self.cell_size + self.cell_size

qp.drawRect(x1, y1, x2-x1, y2-y1)

def color_cell(self, qp, col, row):

qp.setBrush(QtGui.QColor(*self.COLORS[self.cells[(col,row)]]))

self.draw_cell(qp, col, row)

def draw_grid(self, qp):

qp.setPen(QtGui.QColor(128,128,128)) # gray

# Horizontal lines

for i in range(self.rows):

qp.drawLine(0, i * self.cell_size, self.width, i * self.cell_size)

# Vertical lines

for j in range(self.columns):

qp.drawLine(j * self.cell_size, 0, j * self.cell_size, self.height)

def set_all(self, type):

self.cells = {(x,y):type for x in range(1,self.columns+1) for y in range(1,self.rows+1)}

self.repaint()

def fill(self, x, y, type):

print(x,y)

if x < 1 or x >= self.columns+1 or y < 1 or y >= self.rows+1:

return

if self.cells[(x,y)] != None:

return

self.cells[(x,y)] = type

self.repaint()

self.fill(x+1, y, type)

self.fill(x-1, y, type)

self.fill(x, y+1, type)

self.fill(x, y-1, type)

def paintEvent(self, e):

qp = QtGui.QPainter()

qp.begin(self)

self.draw_grid(qp)

for row in range(1, self.rows+1):

for col in range(1, self.columns+1):

if self.cells[(col,row)] != None:

self.color_cell(qp, col, row)

qp.end()

def drawPoints(self, qp):

size = self.size()

for i in range(1000):

x = random.randint(1, size.width()-1)

y = random.randint(1, size.height()-1)

qp.drawPoint(x, y)

def mousePressEvent(self, e):

x,y = self.translate(e.pos().x(),e.pos().y())

if e.button() == QtCore.Qt.LeftButton:

if self.cells[(x,y)] == None:

self.cells[(x,y)]=0

else:

self.cells[(x,y)]+=1

self.check_cell(x,y)

elif e.button() == QtCore.Qt.RightButton:

self.fill(x,y,0)

'''

if self.cells[(x,y)] == None:

self.cells[(x,y)]=0

else:

self.cells[(x,y)]-=1

self.check_cell(x,y)

'''

else: pass

self.repaint()

def save(self):

return self.cells

def open(self, new_cells):

self.cells=new_cells

self.repaint()

def main():

app = QtGui.QApplication(sys.argv)

ex = Example()

ex.show()

sys.exit(app.exec_())

if __name__ == '__main__':

main()

有谁能帮助诊断这个问题，或者指出解决它的方向吗？