我正在尝试在 pygame 中重新创建游戏蛇作为介绍,但是我正在努力解决如何在蛇移动时为蛇的每个方块创建渐变。我的其余代码都是有效的。
我写了以下代码:
import colorsys
class Snake:
def __init__(self):
self.body = [Vector2(5,no_cell/2), Vector2(4,no_cell/2), Vector2(3,no_cell/2)]
self.direction = Vector2(1,0)
self.new_block = False
self.start_hue = 0.0
self.end_hue = 0.7
self.num_steps = 20
def generate_gradient(self, start_hue, end_hue, num_steps):
hues = []
for i in range(num_steps):
hue = start_hue + (end_hue - start_hue) * (i / (num_steps - 1))
hues.append(hue % 1.0)
colours = [colorsys.hsv_to_rgb(hue, 1.0, 1.0) for hue in hues]
return colours
def draw_snake(self):
colours = self.generate_gradient(self.start_hue, self.end_hue,
self.num_steps)
for rgb in colours:
for block in self.body:
x_pos = int(block.x * cell_size)
y_pos = int(block.y * cell_size)
block_rect = pygame.Rect(x_pos + grid_border, y_pos +
heading_border + grid_border, cell_size, cell_size)
rgb = tuple(int(value * 255) for value in rgb)
pygame.draw.rect(screen, rgb, block_rect)
当我运行此命令时,出现以下错误: “pygame.draw.rect(屏幕,rgb,block_rect) ValueError:无效的颜色参数”
您遇到的问题可能是由于您尝试在其范围之外使用 rgb 元组。 rgb 变量在蛇身体的每个块的内部循环中重新定义,但应该为渐变中的每种颜色定义一次,然后用于与该颜色对应的所有块。
这是您的draw_snake方法的修订版本,应该可以解决问题:
import pygame
import colorsys
class SnakeGame:
def __init__(self, start_hue, end_hue, num_steps, body, cell_size, grid_border, heading_border, screen):
self.start_hue = start_hue
self.end_hue = end_hue
self.num_steps = num_steps
self.body = body
self.cell_size = cell_size
self.grid_border = grid_border
self.heading_border = heading_border
self.screen = screen
def generate_gradient(self, start_hue, end_hue, num_steps):
hues = []
for i in range(num_steps):
hue = start_hue + (end_hue - start_hue) * (i / (num_steps - 1))
hues.append(hue % 1.0)
colours = [colorsys.hsv_to_rgb(hue, 1.0, 1.0) for hue in hues]
return colours
def draw_snake(self):
colours = self.generate_gradient(self.start_hue, self.end_hue, len(self.body))
for i, block in enumerate(self.body):
x_pos = int(block.x * self.cell_size)
y_pos = int(block.y * self.cell_size)
block_rect = pygame.Rect(x_pos + self.grid_border, y_pos + self.heading_border + self.grid_border, self.cell_size, self.cell_size)
rgb = colours[i]
rgb = tuple(int(value * 255) for value in rgb)
pygame.draw.rect(self.screen, rgb, block_rect)
# Example usage:
# Assuming you have the following variables defined:
# start_hue, end_hue, num_steps, body, cell_size, grid_border, heading_border, screen
game = SnakeGame(start_hue, end_hue, num_steps, body, cell_size, grid_border, heading_border, screen)
game.draw_snake()
以下是我所做的更改:
将代码封装在一个名为 SnakeGame 的类中以更好地组织。 将所有必需的变量传递给类的构造函数并将它们存储为实例变量。 更新了generate_gradient方法以返回与蛇的身体长度相同的RGB颜色列表。 在draw_snake方法中,我使用enumerate从蛇的身体中获取索引和块。该索引用于从颜色列表中获取相应的颜色。 rgb 元组现在在外循环内正确确定范围,确保每个块获得正确的颜色。 确保将占位符变量(start_hue、end_hue、num_steps、body、cell_size、grid_border、heading_border、screen)替换为游戏中的实际值。
当你想绘制具有渐变效果的蛇时,请记住使用正确的参数初始化SnakeGame类并调用draw_snake方法。