如何检测鼠标是否悬停在按钮上?PyGame 按钮类在悬停时不显示文本或更改颜色 [英] How do I detect if the mouse is hovering over a button? PyGame button class is not displaying the text or changing colour on hover

问题描述

我在 pygame 中创建了一个按钮类，虽然按钮本身正在显示，但我的文本没有显示.当鼠标悬停在按钮上时，我还有一些条件可以改变颜色.我在主函数中使用硬编码值实现了预期的结果，但是我想使用一个类来处理我的各种按钮，因为我可能有很多按钮.

---

下面是我正在使用的一些类

---

字体

 类字体:def __init__(self, font, antialias, text, color, x, y):self.font = 字体self.antialias = 抗锯齿self.text = 文本self.color = 颜色自我.x = x自我.y = ydef draw(self, win):win.blit(self.font.render(self.text, self.antialias, (self.color)), (self.x, self.y))

按钮

class 按钮:def __init__(self, color, x, y, width, height, text, fontsize):self.color = 颜色自我.x = x自我.y = yself.width = 宽度self.height = 高度self.text = 文本self.fontsize = 字体大小self.courier_button_font = pygame.font.SysFont("Courier", self.fontsize)def draw(self, pos):x, y = 位置text_width, text_height = self.courier_button_font.size(self.text)如果 self.x <×＜self.width 和 self.y 

---

我使用按钮的功能

FireTowerButton = Button(BLACK, 810, 200, 80, 30, "Fire Tower", 20)def ShowTowers(鼠标):mousex, mousey = 鼠标screen.fill((147, 207, 14))FireTowerButton.draw(鼠标)定义主():运行 = 真屏幕填充(黑色)# screen.blit(enemy1, (90, 90))运行时:鼠标 = pygame.mouse.get_pos()ShowTowers(鼠标)screen.blit(money_image, (790, 0))screen.blit(background_image, (0, 0))敌人1_spawn(wave_number)pygame.draw.rect(屏幕，黑色，(770、75、30、90))对于 pygame.event.get() 中的事件:如果 event.type == pygame.QUIT:pygame.quit()出口()时钟滴答(FPS)pygame.display.update()

解决方案

条件

<块引用>

if self.x <×＜self.width 和 self.y 

错了.您必须评估 x 和 y :

if self.x <×＜self.x + self.width 和 self.y 

无论如何，我推荐pygame.Rect/collidepoint() 用于碰撞测试:

button_rect = pygame.Rect(self.x, self.y, self.width, self.height)如果 button_rect.collidepoint((x, y):# [...]

button_rect 可以进一步用于绘制矩形:

pygame.draw.rect(screen, (211, 211, 211), button_rect)

通过使用属性 rect 而不是单独的属性 x, y, 可以大大简化代码宽度，高度:

class 按钮:def __init__(self, color, x, y, width, height, text, fontsize):self.color = 颜色self.rect = pygame.Rect(x, y, 宽度, 高度)self.text = 文本self.fontsize = 字体大小self.courier_button_font = pygame.font.SysFont("Courier", self.fontsize)def draw(self, pos):button_color = (211, 211, 211) if self.rect.collidepoint(pos) else self.colorpygame.draw.rect(屏幕，button_color，self.rect)text_width, text_height = self.courier_button_font.size(self.text)textpos = (self.rect.centerx - text_width//2, self.rect.centery - text_height//2)buttontext = Fonts(courier_font, True, self.text, BLACK, textpos)buttontext.draw(屏幕)def isOver(self, pos):返回 self.rect.collidepoint(pos)

I have created a button class in pygame and although the button itself is displaying, my text is not showing up. Also I have some conditions to change the colour when the mouse is over the button. I have achieved the desired result using hard coded values in my main function, however I want to use a class the handle my various button as I might have quite a few buttons.

---

Given below are some classes that I'm using

---

Fonts

class Fonts:
    def __init__(self, font, antialias, text, color, x, y):
        self.font = font
        self.antialias = antialias
        self.text = text
        self.color = color
        self.x = x
        self.y = y

    def draw(self, win):
        win.blit(self.font.render(self.text, self.antialias, (self.color)), (self.x, self.y))

Button

class Button:
    def __init__(self, color, x, y, width, height, text, fontsize):
        self.color = color
        self.x = x
        self.y = y
        self.width = width
        self.height = height
        self.text = text
        self.fontsize = fontsize
        self.courier_button_font = pygame.font.SysFont("Courier", self.fontsize)

    def draw(self, pos):
        x, y = pos
        text_width, text_height = self.courier_button_font.size(self.text)
        if self.x < x < self.width and self.y < y < self.height:
            pygame.draw.rect(screen, (211, 211, 211), (self.x, self.y, self.width, self.height))
            buttontext = Fonts(courier_font, True, f"{self.text}", BLACK,
                               int(self.width / 2 - text_width / 2), int(self.height / 2 - text_height / 2))
            buttontext.draw(screen)


        else:
            pygame.draw.rect(screen, self.color, (self.x, self.y, self.width, self.height))
            buttontext = Fonts(courier_font, True, f"{self.text}", BLACK,
                               (self.width / 2 - text_width / 2), (self.height / 2 - text_height / 2))
            buttontext.draw(screen)

    def isOver(self, pos):
        x, y = pos
        if self.x < x < self.width and self.y < y < self.height:
            return True
        else:
            pass

---

The functions where I'm using my button

FireTowerButton = Button(BLACK, 810, 200, 80, 30, "Fire Tower", 20)

def ShowTowers(mouse):
    mousex, mousey = mouse
    screen.fill((147, 207, 14))
    FireTowerButton.draw(mouse)

def main():
    run = True
    screen.fill(BLACK)
    # screen.blit(enemy1, (90, 90))
    while run:
        mouse = pygame.mouse.get_pos()
        ShowTowers(mouse)
        screen.blit(money_image, (790, 0))
        screen.blit(background_image, (0, 0))
        enemy1_spawn(wave_number)
        pygame.draw.rect(screen, BLACK, (770, 75, 30, 90))
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                exit()

        clock.tick(FPS)
        pygame.display.update()

解决方案

The condition

if self.x < x < self.width and self.y < y < self.height:

is wrong. You have to evaluate if x < self.x + self.width and y < self.y + self.height:

if self.x < x < self.x + self.width and self.y < y < self.y + self.height:
    # [...]

Anyway, I recommend to pygame.Rect / collidepoint() for the collision test:

button_rect = pygame.Rect(self.x, self.y, self.width, self.height)
if button_rect.collidepoint((x, y):
    # [...]

button_rect can be used further for drawing the rectangle:

pygame.draw.rect(screen, (211, 211, 211), button_rect)

The code can be simplified a lot by the use of an attribute rect rather than the separate attributes x, y, width, height:

class Button:
    def __init__(self, color, x, y, width, height, text, fontsize):
        self.color = color
        self.rect = pygame.Rect(x, y, width, height)
        self.text = text
        self.fontsize = fontsize
        self.courier_button_font = pygame.font.SysFont("Courier", self.fontsize)

    def draw(self, pos):

        button_color = (211, 211, 211) if self.rect.collidepoint(pos) else self.color
        pygame.draw.rect(screen, button_color, self.rect)

        text_width, text_height = self.courier_button_font.size(self.text)
        textpos = (self.rect.centerx - text_width // 2, self.rect.centery - text_height // 2)
        buttontext = Fonts(courier_font, True, self.text, BLACK, textpos)
        buttontext.draw(screen)

    def isOver(self, pos):
        return self.rect.collidepoint(pos)

这篇关于如何检测鼠标是否悬停在按钮上?PyGame 按钮类在悬停时不显示文本或更改颜色的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！