pygame.Surface 和鼠标之间的碰撞检测不工作
Collision detection between pygame.Surface and mouse not working
我正在尝试为像素艺术制作 canvas。
class Canvas:
def __init__(self):
self.__blocks = []
self.__positions = []
for i in range(1830):
self.__blocks.append(pygame.Surface((20, 20)).convert())
for y in range(30):
y *= 20
for x in range(61):
x = x* 20
self.__positions.append([x, y])
self.__color = False
def draw(self, window):
for i in range(1830):
self.__color = not self.__color
if self.__color:
self.__blocks[i].fill((200, 200, 200))
else:
self.__blocks[i].fill((50, 50, 50))
window.blit(self.__blocks[i], (self.__positions[i][0]
, self.__positions[i][1]))
我在这里尝试生成并绘制 1830 个独特的表面，这很有效。然后我尝试在每个块和鼠标之间实现碰撞检测，但失败了。
def collided(self, pos):
for i in range(1380):
block = self.__blocks[i].get_rect()
if block.collidepoint(pos[0], pos[1]):
print(block.x, block.y)
然后我对它可能失败的原因进行了不同的测试。这是其中之一。我将更改单个块的颜色，在我们的例子中是第 10 个块 self.__blocks[10].fill((255, 0, 0)) 为红色，以便我们知道要单击哪个框。然后我们将尝试检查该特定块的碰撞。
def testBlock(self, pos):
block = self.__blocks[10].get_rect()
if block.collidepoint(pos[0], pos[1]):
print(block.x)
它不起作用，但奇怪的是它对第一个块（在第 0 个索引中）有效，并且无论我测试哪个表面都只对第一个块有效。任何关于如何解决这个问题的想法将不胜感激。以下是复制粘贴代码。
import pygame
pygame.init()
win = pygame.display
D = win.set_mode((1220, 600))
class Canvas:
def __init__(self):
self.__blocks = []
self.__positions = []
for i in range(1830):
self.__blocks.append(pygame.Surface((20, 20)).convert())
for y in range(30):
y *= 20
for x in range(61):
x = x* 20
self.__positions.append([x, y])
self.__color = False
self.testBlock = 10
def draw(self, window):
for i in range(1830):
self.__color = not self.__color
if self.__color:
self.__blocks[i].fill((200, 200, 200))
else:
self.__blocks[i].fill((50, 50, 50))
self.__blocks[self.testBlock].fill((255, 0, 0)) # Changing the color for testing
window.blit(self.__blocks[i], (self.__positions[i][0]
, self.__positions[i][1]))
def test(self, pos):
block = self.__blocks[self.testBlock].get_rect()
if block.collidepoint(pos[0], pos[1]):
print(block.x, block.y)
canvas = Canvas()
while True:
D.fill((0, 0, 0))
pygame.event.get()
mousepos = pygame.mouse.get_pos()
canvas.draw(D)
canvas.test(mousepos)
win.flip()
当您在 Surface 上调用 .get_rect() 时，它不知道其当前位置，因为那不是 Surface 信息。所以需要在碰撞检测前将位置赋值给Rect。
使用您当前的代码布局，您可以在构建期间执行此操作。随着 Canvass 块位置现在在 __rects 列表中，__positions 列表变得多余。
class Canvass:
def __init__(self):
self.__blocks = []
self.__rects = []
for y in range( 30 ):
for x in range( 61 ):
self.__blocks.append(pygame.Surface((20, 20)).convert())
self.__rects.append( self.__blocks[-1].get_rect() )
self.__rects[-1].topleft = ( x, y )
self.__color = False
self.testBlock = 10
这给你一个简单的测试：
def collided(self, pos):
hit = False
for i in range( len( self.__rects ) ):
if ( self.__rects[i].collidepoint( pos[0], pos[1] ) ):
print( "Click on block %d" % ( i ) )
hit = True
break
return hit, i
.get_rect() 给出具有块大小但位置为 (0, 0)
的矩形
您在 __positions 中有实际职位，您需要
.get_rect(topleft=self.__positions[self.testBlock])
def test(self, pos):
block = self.__blocks[self.testBlock].get_rect(topleft=self.__positions[self.testBlock])
if block.collidepoint(pos[0], pos[1]):
print(block.x, block.y)
但最好在开始时获取rect并设置其位置，以后不要使用get_rect()。
您还可以创建类似于 class Sprite 的 class Pixel，其中 self.image 保持表面，self.rect 保持其大小和位置。然后你可以使用 Group 检查所有像素的碰撞。
编辑：
使用 class pygame.sprite.Sprite to create class Pixel and it keeps all pixels in pygame.sprite.Group
的示例
它还处理事件 (MOUSEBUTTONDOWN) 以在单击时更改任何像素的颜色。
import pygame
# --- classes ---
class Pixel(pygame.sprite.Sprite):
def __init__(self, x, y, color, width=20, height=20):
super().__init__()
self.color_original = color
self.color = color
self.image = pygame.Surface((20, 20)).convert()
self.image.fill(self.color)
self.rect = pygame.Rect(x, y, width, height)
def handle_event(self, event):
if event.type == pygame.MOUSEBUTTONDOWN:
if self.rect.collidepoint(event.pos):
if self.color != self.color_original:
self.color = self.color_original
else:
self.color = (255,0,0)
self.image.fill(self.color)
# event handled
return True
# event not handled
return False
class Canvas:
def __init__(self):
# create group for sprites
self.__blocks = pygame.sprite.Group()
# create sprites
self.__color = False
for y in range(30):
y *= 20
for x in range(61):
x *= 20
self.__color = not self.__color
if self.__color:
color = (200, 200, 200)
else:
color = (50, 50, 50)
self.__blocks.add(Pixel(x, y, color))
# changing the color for testing
self.testBlock = 10
all_sprites = self.__blocks.sprites()
block = all_sprites[self.testBlock]
block.image.fill((255, 0, 0))
def draw(self, window):
# draw all sprites in group
self.__blocks.draw(window)
def test(self, pos):
# test collision with one sprite
all_sprites = self.__blocks.sprites()
block = all_sprites[self.testBlock]
if block.rect.collidepoint(pos):
print(block.rect.x, block.rect.y)
def handle_event(self, event):
for item in self.__blocks:
if item.handle_event(event):
# don't check other pixels if event already handled
return True
# --- main ---
pygame.init()
win = pygame.display
D = win.set_mode((1220, 600))
canvas = Canvas()
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
exit()
canvas.handle_event(event)
#mousepos = pygame.mouse.get_pos()
#canvas.test(mousepos)
# draws (without updates, etc)
#D.fill((0, 0, 0)) # no need clean screen if it will draw all elements again
canvas.draw(D)
win.flip()
我正在尝试为像素艺术制作 canvas。
class Canvas:
def __init__(self):
self.__blocks = []
self.__positions = []
for i in range(1830):
self.__blocks.append(pygame.Surface((20, 20)).convert())
for y in range(30):
y *= 20
for x in range(61):
x = x* 20
self.__positions.append([x, y])
self.__color = False
def draw(self, window):
for i in range(1830):
self.__color = not self.__color
if self.__color:
self.__blocks[i].fill((200, 200, 200))
else:
self.__blocks[i].fill((50, 50, 50))
window.blit(self.__blocks[i], (self.__positions[i][0]
, self.__positions[i][1]))
我在这里尝试生成并绘制 1830 个独特的表面，这很有效。然后我尝试在每个块和鼠标之间实现碰撞检测，但失败了。
def collided(self, pos):
for i in range(1380):
block = self.__blocks[i].get_rect()
if block.collidepoint(pos[0], pos[1]):
print(block.x, block.y)
然后我对它可能失败的原因进行了不同的测试。这是其中之一。我将更改单个块的颜色，在我们的例子中是第 10 个块 self.__blocks[10].fill((255, 0, 0)) 为红色，以便我们知道要单击哪个框。然后我们将尝试检查该特定块的碰撞。
def testBlock(self, pos):
block = self.__blocks[10].get_rect()
if block.collidepoint(pos[0], pos[1]):
print(block.x)
它不起作用，但奇怪的是它对第一个块（在第 0 个索引中）有效，并且无论我测试哪个表面都只对第一个块有效。任何关于如何解决这个问题的想法将不胜感激。以下是复制粘贴代码。
import pygame
pygame.init()
win = pygame.display
D = win.set_mode((1220, 600))
class Canvas:
def __init__(self):
self.__blocks = []
self.__positions = []
for i in range(1830):
self.__blocks.append(pygame.Surface((20, 20)).convert())
for y in range(30):
y *= 20
for x in range(61):
x = x* 20
self.__positions.append([x, y])
self.__color = False
self.testBlock = 10
def draw(self, window):
for i in range(1830):
self.__color = not self.__color
if self.__color:
self.__blocks[i].fill((200, 200, 200))
else:
self.__blocks[i].fill((50, 50, 50))
self.__blocks[self.testBlock].fill((255, 0, 0)) # Changing the color for testing
window.blit(self.__blocks[i], (self.__positions[i][0]
, self.__positions[i][1]))
def test(self, pos):
block = self.__blocks[self.testBlock].get_rect()
if block.collidepoint(pos[0], pos[1]):
print(block.x, block.y)
canvas = Canvas()
while True:
D.fill((0, 0, 0))
pygame.event.get()
mousepos = pygame.mouse.get_pos()
canvas.draw(D)
canvas.test(mousepos)
win.flip()
当您在 Surface 上调用 .get_rect() 时，它不知道其当前位置，因为那不是 Surface 信息。所以需要在碰撞检测前将位置赋值给Rect。
使用您当前的代码布局，您可以在构建期间执行此操作。随着 Canvass 块位置现在在 __rects 列表中，__positions 列表变得多余。
class Canvass:
def __init__(self):
self.__blocks = []
self.__rects = []
for y in range( 30 ):
for x in range( 61 ):
self.__blocks.append(pygame.Surface((20, 20)).convert())
self.__rects.append( self.__blocks[-1].get_rect() )
self.__rects[-1].topleft = ( x, y )
self.__color = False
self.testBlock = 10
这给你一个简单的测试：
def collided(self, pos):
hit = False
for i in range( len( self.__rects ) ):
if ( self.__rects[i].collidepoint( pos[0], pos[1] ) ):
print( "Click on block %d" % ( i ) )
hit = True
break
return hit, i
.get_rect() 给出具有块大小但位置为 (0, 0)
您在 __positions 中有实际职位，您需要
.get_rect(topleft=self.__positions[self.testBlock])
def test(self, pos):
block = self.__blocks[self.testBlock].get_rect(topleft=self.__positions[self.testBlock])
if block.collidepoint(pos[0], pos[1]):
print(block.x, block.y)
但最好在开始时获取rect并设置其位置，以后不要使用get_rect()。
您还可以创建类似于 class Sprite 的 class Pixel，其中 self.image 保持表面，self.rect 保持其大小和位置。然后你可以使用 Group 检查所有像素的碰撞。
编辑：
使用 class pygame.sprite.Sprite to create class Pixel and it keeps all pixels in pygame.sprite.Group
它还处理事件 (MOUSEBUTTONDOWN) 以在单击时更改任何像素的颜色。
import pygame
# --- classes ---
class Pixel(pygame.sprite.Sprite):
def __init__(self, x, y, color, width=20, height=20):
super().__init__()
self.color_original = color
self.color = color
self.image = pygame.Surface((20, 20)).convert()
self.image.fill(self.color)
self.rect = pygame.Rect(x, y, width, height)
def handle_event(self, event):
if event.type == pygame.MOUSEBUTTONDOWN:
if self.rect.collidepoint(event.pos):
if self.color != self.color_original:
self.color = self.color_original
else:
self.color = (255,0,0)
self.image.fill(self.color)
# event handled
return True
# event not handled
return False
class Canvas:
def __init__(self):
# create group for sprites
self.__blocks = pygame.sprite.Group()
# create sprites
self.__color = False
for y in range(30):
y *= 20
for x in range(61):
x *= 20
self.__color = not self.__color
if self.__color:
color = (200, 200, 200)
else:
color = (50, 50, 50)
self.__blocks.add(Pixel(x, y, color))
# changing the color for testing
self.testBlock = 10
all_sprites = self.__blocks.sprites()
block = all_sprites[self.testBlock]
block.image.fill((255, 0, 0))
def draw(self, window):
# draw all sprites in group
self.__blocks.draw(window)
def test(self, pos):
# test collision with one sprite
all_sprites = self.__blocks.sprites()
block = all_sprites[self.testBlock]
if block.rect.collidepoint(pos):
print(block.rect.x, block.rect.y)
def handle_event(self, event):
for item in self.__blocks:
if item.handle_event(event):
# don't check other pixels if event already handled
return True
# --- main ---
pygame.init()
win = pygame.display
D = win.set_mode((1220, 600))
canvas = Canvas()
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
exit()
canvas.handle_event(event)
#mousepos = pygame.mouse.get_pos()
#canvas.test(mousepos)
# draws (without updates, etc)
#D.fill((0, 0, 0)) # no need clean screen if it will draw all elements again
canvas.draw(D)
win.flip()