如何将文本添加到Rect并在屏幕上移动？

Question

尝试将文本添加到矩形中，并使用箭头键在屏幕上移动矩形。我想让它这样的文字不会离开边缘。到目前为止，我没有把它放入一个Rect中，但我想让Rect函数工作。现在，文本只是反弹回来，我不知道要使与字体大小对应的原始矩形有多大

import pygame
import sys

pygame.init()

screen = pygame.display.set_mode((800,600),0)
pygame.display.set_caption("Basic Pygame Text With Rects")

width = screen.get_width()
height = screen.get_height()
x = int(width/2)
y = int(height/2)
dx = 0
dy = 0
speed = 10
oldx = x
oldy = y

WHITE = (255,255,255)
GREEN = (0,255,0)
RED = (255,0,0)
BLUE = (0,0,255)
BLACK = (0, 0, 0)
YELLOW = (255, 255, 0)
colour = BLACK

textRect = pygame.Rect(x, y, 30, 10)

screen.fill(WHITE)
pygame.display.update()

# first set up your font (typeface and size)
# I have created two different ones here that can be used later in the program
fontTitle = pygame.font.SysFont("arial",10)

main = True
while main:
    for event in pygame.event.get():
        if event.type ==pygame.QUIT:
            main = False
        if event.type ==pygame.KEYDOWN:
            if event.key == pygame.K_UP:
                dx = 0
                dy = -speed
                colour = RED
            elif event.key == pygame.K_DOWN:
                dx = 0
                dy = speed
                colour = BLUE
            elif event.key == pygame.K_LEFT:     # note: this section of code
                dx = -speed                     # doesn't have to change from
                dy = 0
                colour = GREEN
            elif event.key == pygame.K_RIGHT:
                dx = speed
                dy = 0
                colour = YELLOW
            elif event.key == pygame.K_c:
                x = screen.get_width() / 2
                y = screen.get_height() / 2
                colour = BLACK
        if event.type == pygame.KEYUP:
            if event.key == pygame.K_UP or event.key == pygame.K_DOWN:
                dx = 0
                dy = 0
            elif event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
                dx = 0
                dy = 0
    screen.fill(WHITE)


    oldx = x
    oldy = y
    textRect.move_ip(dx,dy)

    if (textRect.y <= 0) or (textRect.y >= height):
        dy = 0
        textRect.y = int(oldy)
    if (textRect.x <= 20) or (textRect.x >= width - 20):
        dx = 0
        textRect.x = int(oldx)
    # render the text into an image of the text, colour is red
    # create a rect with it's centre placed at centre of screen
    # blit the image to memory, it will display upon next update
    textTitle = fontTitle.render("Go Huskies", True, colour)
    drawText = textTitle.get_rect(center=(textRect.x, textRect.y))

    screen.blit(textTitle, textRect)
    pygame.display.update()

pygame.quit()
sys.exit()

Answer 1

您可以在开始时生成文本以获取其大小

fontTitle = pygame.font.SysFont("arial", 10)
textTitle = fontTitle.render("Go Huskies", True, colour)
rectTitle = textTitle.get_rect(center=screen.get_rect().center)

以后只使用这个rectTitle来移动它并检查与边界的冲突-并且不创建新的textTitle.get_rect()

screen.blit(textTitle, rectTitle)

Rect有.top、.bottom、.left、.right、.centerx、.centery可用于检查冲突

oldx, oldy = rectTitle.center

rectTitle.move_ip(dx, dy)

if (rectTitle.top <= 0) or (rectTitle.bottom >= height):
    dy = 0
    rectTitle.centery = oldy

if (rectTitle.left <= 0) or (rectTitle.right >= width):
    dx = 0
    rectTitle.centerx = oldx

---

import pygame
import sys

#  - constants  - (UPPER_CASE_NAMES)

WHITE = (255,255,255)
GREEN = (0,255,0)
RED = (255,0,0)
BLUE = (0,0,255)
BLACK = (0, 0, 0)
YELLOW = (255, 255, 0)

#  - classes  - (CamelCaseNames)

# empty

#  - functions  - (lower_case_names)

# empty

#  - main  - (lower_case_names)

pygame.init()

screen = pygame.display.set_mode((800,600),0)
screen_rect = screen.get_rect()

pygame.display.set_caption("Basic Pygame Text With Rects")

x, y = screen_rect.center
width, height = screen_rect.size
dx = 0
dy = 0
speed = 10
oldx = x
oldy = y

colour = BLACK

fontTitle = pygame.font.SysFont("arial", 10)
textTitle = fontTitle.render("Go Huskies", True, colour)
rectTitle = textTitle.get_rect(center=screen_rect.center)

# - mainloop -

clock = pygame.time.Clock()

main = True
while main:

    # - events -

    for event in pygame.event.get():
        if event.type ==pygame.QUIT:
            main = False
        if event.type ==pygame.KEYDOWN:
            if event.key == pygame.K_UP:
                dx = 0
                dy = -speed
                colour = RED
            elif event.key == pygame.K_DOWN:
                dx = 0
                dy = speed
                colour = BLUE
            elif event.key == pygame.K_LEFT:     # note: this section of code
                dx = -speed                     # doesn't have to change from
                dy = 0
                colour = GREEN
            elif event.key == pygame.K_RIGHT:
                dx = speed
                dy = 0
                colour = YELLOW
            elif event.key == pygame.K_c:
                x, y = screen_rect.center
                colour = BLACK
        if event.type == pygame.KEYUP:
            if event.key == pygame.K_UP or event.key == pygame.K_DOWN:
                dx = 0
                dy = 0
            elif event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
                dx = 0
                dy = 0

    # - moves/updates -

    oldx, oldy = rectTitle.center
    rectTitle.move_ip(dx,dy)

    if (rectTitle.top <= 0) or (rectTitle.bottom >= height):
        dy = 0
        rectTitle.centery = oldy

    if (rectTitle.left <= 0) or (rectTitle.right >= width):
        dx = 0
        rectTitle.centerx = oldx

    textTitle = fontTitle.render("Go Huskies", True, colour)

    # - draws -

    screen.fill(WHITE)
    screen.blit(textTitle, rectTitle)
    pygame.display.update()

    clock.tick(25) # slow down to 25 FPS (frames per seconds)

# - end -

pygame.quit()
sys.exit()

---

如果你想用背景矩形移动文本，那么你可以创建Surface()，用一些颜色填充它，然后在它上面blit文本

开始时：

rectRect = pygame.surface.Surface
fontTitle = pygame.font.SysFont("arial", 10)
textTitle = fontTitle.render("Go Huskies", True, colour)
rectTitle = textTitle.get_rect(center=screen_rect.center)

item_surface = pygame.surface.Surface(rectTitle.size)
item_surface.fill(RED)
item_surface.blit(textTitle, (0,0))

textTitle = item_surface

循环中：

textTitle = fontTitle.render("Go Huskies", True, colour)

item_surface = pygame.surface.Surface(rectTitle.size)
item_surface.fill(RED)
item_surface.blit(textTitle, (0,0))
textTitle = item_surface

完整代码：

import pygame
import sys

#  - constants  - (UPPER_CASE_NAMES)

WHITE = (255,255,255)
GREEN = (0,255,0)
RED = (255,0,0)
BLUE = (0,0,255)
BLACK = (0, 0, 0)
YELLOW = (255, 255, 0)

#  - classes  - (CamelCaseNames)

# empty

#  - functions  - (lower_case_names)

# empty

#  - main  - (lower_case_names)

pygame.init()

screen = pygame.display.set_mode((800,600),0)
screen_rect = screen.get_rect()

pygame.display.set_caption("Basic Pygame Text With Rects")

x, y = screen_rect.center
width, height = screen_rect.size
dx = 0
dy = 0
speed = 10
oldx = x
oldy = y

colour = BLACK

rectRect = pygame.surface.Surface
fontTitle = pygame.font.SysFont("arial", 10)
textTitle = fontTitle.render("Go Huskies", True, colour)
rectTitle = textTitle.get_rect(center=screen_rect.center)

item_surface = pygame.surface.Surface(rectTitle.size)
item_surface.fill(RED)
item_surface.blit(textTitle, (0,0))

textTitle = item_surface

# - mainloop -

clock = pygame.time.Clock()

main = True
while main:

    # - events -

    for event in pygame.event.get():
        if event.type ==pygame.QUIT:
            main = False
        if event.type ==pygame.KEYDOWN:
            if event.key == pygame.K_UP:
                dx = 0
                dy = -speed
                colour = RED
            elif event.key == pygame.K_DOWN:
                dx = 0
                dy = speed
                colour = BLUE
            elif event.key == pygame.K_LEFT:     # note: this section of code
                dx = -speed                     # doesn't have to change from
                dy = 0
                colour = GREEN
            elif event.key == pygame.K_RIGHT:
                dx = speed
                dy = 0
                colour = YELLOW
            elif event.key == pygame.K_c:
                x, y = screen_rect.center
                colour = BLACK
        if event.type == pygame.KEYUP:
            if event.key == pygame.K_UP or event.key == pygame.K_DOWN:
                dx = 0
                dy = 0
            elif event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
                dx = 0
                dy = 0

    # - moves -

    oldx, oldy = rectTitle.center
    rectTitle.move_ip(dx,dy)

    if (rectTitle.top <= 0) or (rectTitle.bottom >= height):
        dy = 0
        rectTitle.centery = oldy

    if (rectTitle.left <= 0) or (rectTitle.right >= width):
        dx = 0
        rectTitle.centerx = oldx

    textTitle = fontTitle.render("Go Huskies", True, colour)

    item_surface = pygame.surface.Surface(rectTitle.size)
    item_surface.fill(RED)
    item_surface.blit(textTitle, (0,0))

    textTitle = item_surface

    # - draws -

    screen.fill(WHITE)
    screen.blit(textTitle, rectTitle)
    pygame.display.update()

    clock.tick(25) # slow down to 25 FPS (frames per seconds)

# - end - 

pygame.quit()
sys.exit()