import pygame import sys # 初始化Pygame pygame.init() # 窗口设置 WINDOW_WIDTH = 650 WINDOW_HEIGHT = 500 BACKGROUND_COLOR = (245, 245, 250) # 浅紫色背景 TEXT_COLOR = (40, 40, 60) INPUT_BOX_COLOR = (255, 255, 255) INPUT_BOX_ACTIVE_COLOR = (230, 230, 255) BUTTON_COLOR = (100, 150, 200) BUTTON_HOVER_COLOR = (130, 180, 230) RESULT_BG_COLOR = (235, 240, 255) HEADER_COLOR = (80, 120, 160) # 字体设置 FONT = pygame.font.Font(None, 36) SMALL_FONT = pygame.font.Font(None, 28) TITLE_FONT = pygame.font.Font(None, 42) # 定义重量单位与千克之间的转换关系 UNITS = { "千克 (kg)": 1.0, "克 (g)": 0.001, "毫克 (mg)": 0.000001, "吨 (t)": 1000.0, "磅 (lb)": 0.45359237, "盎司 (oz)": 0.028349523125, "市斤 (斤)": 0.5, "两": 0.05, "英石 (st)": 6.35029318, "克拉 (ct)": 0.0002 } class WeightConverter: def __init__(self): self.screen = pygame.display.set_mode((WINDOW_WIDTH, WINDOW_HEIGHT)) pygame.display.set_caption("重量单位转换器") self.clock = pygame.time.Clock() self.running = True # 单位列表 self.unit_names = list(UNITS.keys()) self.unit_display = {} for name in self.unit_names: if " (" in name: parts = name.split(" (") self.unit_display[name] = f"{parts[0]} ({parts[1][:-1]})" else: self.unit_display[name] = name # 选择的单位 self.from_unit = "千克 (kg)" self.to_unit = "磅 (lb)" # 输入框 self.input_text = "" self.input_active = True self.input_rect = pygame.Rect(200, 100, 280, 45) # 下拉菜单 self.show_from_dropdown = False self.show_to_dropdown = False self.dropdown_visible_items = 6 self.dropdown_item_height = 38 # 从单位下拉菜单 self.from_dropdown_rect = pygame.Rect(200, 165, 280, 42) self.from_dropdown_items_rect = pygame.Rect(200, 207, 280, self.dropdown_item_height * self.dropdown_visible_items) # 到单位下拉菜单 self.to_dropdown_rect = pygame.Rect(200, 255, 280, 42) self.to_dropdown_items_rect = pygame.Rect(200, 297, 280, self.dropdown_item_height * self.dropdown_visible_items) # 滚动偏移 self.from_scroll = 0 self.to_scroll = 0 # 转换按钮 self.convert_button = pygame.Rect(225, 360, 200, 55) # 清空按钮 self.clear_button = pygame.Rect(225, 430, 200, 40) # 结果 self.result = None self.error_message = None # 常用转换提示 self.show_tips = True def handle_events(self): """处理事件""" mouse_pos = pygame.mouse.get_pos() for event in pygame.event.get(): if event.type == pygame.QUIT: self.running = False elif event.type == pygame.MOUSEBUTTONDOWN: # 关闭下拉菜单 if not self.from_dropdown_rect.collidepoint(mouse_pos) and not self.from_dropdown_items_rect.collidepoint(mouse_pos): self.show_from_dropdown = False if not self.to_dropdown_rect.collidepoint(mouse_pos) and not self.to_dropdown_items_rect.collidepoint(mouse_pos): self.show_to_dropdown = False # 点击从单位选择框 if self.from_dropdown_rect.collidepoint(mouse_pos): self.show_from_dropdown = not self.show_from_dropdown self.show_to_dropdown = False self.input_active = False # 点击到单位选择框 elif self.to_dropdown_rect.collidepoint(mouse_pos): self.show_to_dropdown = not self.show_to_dropdown self.show_from_dropdown = False self.input_active = False # 点击输入框 elif self.input_rect.collidepoint(mouse_pos): self.input_active = True self.show_from_dropdown = False self.show_to_dropdown = False # 点击转换按钮 elif self.convert_button.collidepoint(mouse_pos): self.convert_weight() # 点击清空按钮 elif self.clear_button.collidepoint(mouse_pos): self.clear_all() # 处理下拉菜单选择 elif self.show_from_dropdown: self.handle_dropdown_click(mouse_pos, self.from_dropdown_items_rect, self.from_scroll, is_from=True) elif self.show_to_dropdown: self.handle_dropdown_click(mouse_pos, self.to_dropdown_items_rect, self.to_scroll, is_from=False) else: self.input_active = False elif event.type == pygame.KEYDOWN and self.input_active: if event.key == pygame.K_RETURN: self.convert_weight() elif event.key == pygame.K_BACKSPACE: self.input_text = self.input_text[:-1] elif event.key == pygame.K_ESCAPE: self.input_text = "" else: # 允许输入数字、负号和小数点 if (event.unicode.isdigit() or event.unicode == '.' or (event.unicode == '-' and len(self.input_text) == 0)): self.input_text += event.unicode # 限制小数点个数 if self.input_text.count('.') > 1: self.input_text = self.input_text[:-1] # 限制负号位置 if self.input_text.count('-') > 1 or (self.input_text.count('-') == 1 and self.input_text[0] != '-'): self.input_text = self.input_text.replace('-', '', 1) if self.input_text[0] != '-': self.input_text = '-' + self.input_text def handle_dropdown_click(self, mouse_pos, dropdown_rect, scroll, is_from): """处理下拉菜单点击""" if dropdown_rect.collidepoint(mouse_pos): # 计算点击的项 relative_y = mouse_pos[1] - dropdown_rect.y item_index = relative_y // self.dropdown_item_height + scroll if 0 <= item_index < len(self.unit_names): if is_from: self.from_unit = self.unit_names[item_index] self.show_from_dropdown = False else: self.to_unit = self.unit_names[item_index] self.show_to_dropdown = False self.result = None self.error_message = None def clear_all(self): """清空所有输入和结果""" self.input_text = "" self.result = None self.error_message = None self.input_active = True def convert_weight(self): """执行重量转换""" self.error_message = None self.result = None if not self.input_text: self.error_message = "请输入重量值" return try: value = float(self.input_text) except ValueError: self.error_message = "请输入有效的数字" return # 不允许负数（除了可能的科学计算，但重量一般不为负） if value < 0: self.error_message = "重量不能为负数" return # 转换为千克 kilograms = value * UNITS[self.from_unit] # 转换为目标单位 result_value = kilograms / UNITS[self.to_unit] # 格式化结果 if result_value == 0: self.result = "0" elif abs(result_value) < 0.000001: self.result = f"{result_value:.10e}" elif abs(result_value) < 0.0001: self.result = f"{result_value:.8f}" elif abs(result_value) < 0.01: self.result = f"{result_value:.6f}" elif abs(result_value) < 1: self.result = f"{result_value:.4f}" elif abs(result_value) < 1000: self.result = f"{result_value:.3f}" elif abs(result_value) < 1000000: self.result = f"{result_value:.2f}" else: self.result = f"{result_value:.2e}" # 移除末尾多余的0 if '.' in self.result: self.result = self.result.rstrip('0').rstrip('.') def draw_dropdown(self, rect, selected_unit, show_dropdown, scroll, is_from): """绘制下拉菜单""" # 绘制选择框 color = INPUT_BOX_ACTIVE_COLOR if show_dropdown else INPUT_BOX_COLOR pygame.draw.rect(self.screen, color, rect, border_radius=8) pygame.draw.rect(self.screen, HEADER_COLOR, rect, 2, border_radius=8) # 显示选中的单位 display_text = self.unit_display[selected_unit] text = SMALL_FONT.render(display_text, True, TEXT_COLOR) self.screen.blit(text, (rect.x + 12, rect.y + 10)) # 绘制下拉箭头 arrow_points = [(rect.right - 22, rect.centery - 6), (rect.right - 12, rect.centery - 6), (rect.right - 17, rect.centery + 4)] pygame.draw.polygon(self.screen, HEADER_COLOR, arrow_points) # 绘制下拉选项 if show_dropdown: items_rect = pygame.Rect(rect.x, rect.bottom, rect.width, self.dropdown_item_height * self.dropdown_visible_items) pygame.draw.rect(self.screen, INPUT_BOX_COLOR, items_rect) pygame.draw.rect(self.screen, HEADER_COLOR, items_rect, 2) # 计算可见项 max_scroll = max(0, len(self.unit_names) - self.dropdown_visible_items) scroll = min(scroll, max_scroll) start_idx = scroll end_idx = min(len(self.unit_names), start_idx + self.dropdown_visible_items) for i in range(start_idx, end_idx): item_rect = pygame.Rect(rect.x, rect.bottom + (i - start_idx) * self.dropdown_item_height, rect.width, self.dropdown_item_height) # 高亮当前选中的项 if self.unit_names[i] == selected_unit: pygame.draw.rect( self.screen, BUTTON_HOVER_COLOR, item_rect) # 鼠标悬停效果 if item_rect.collidepoint(pygame.mouse.get_pos()): pygame.draw.rect(self.screen, (200, 220, 240), item_rect) # 显示单位 display_text = self.unit_display[self.unit_names[i]] text = SMALL_FONT.render(display_text, True, TEXT_COLOR) self.screen.blit(text, (item_rect.x + 12, item_rect.y + 9)) # 绘制滚动条（如果项目太多） if len(self.unit_names) > self.dropdown_visible_items: scrollbar_rect = pygame.Rect(rect.right - 12, rect.bottom, 8, self.dropdown_item_height * self.dropdown_visible_items) pygame.draw.rect(self.screen, (200, 200, 210), scrollbar_rect) # 滚动条滑块 scroll_ratio = scroll / max_scroll if max_scroll > 0 else 0 slider_height = max( 25, scrollbar_rect.height * self.dropdown_visible_items / len(self.unit_names)) slider_y = scrollbar_rect.y + scroll_ratio * \ (scrollbar_rect.height - slider_height) slider_rect = pygame.Rect( scrollbar_rect.x, slider_y, 8, slider_height) pygame.draw.rect(self.screen, BUTTON_COLOR, slider_rect) def draw_tips(self): """绘制常用转换提示""" tips = [ "💡 常用换算：", "1 千克 = 2.20462 磅", "1 磅 = 0.453592 千克", "1 市斤 = 500 克", "1 两 = 50 克" ] tips_x = 30 tips_y = 100 for i, tip in enumerate(tips): if i == 0: tip_surface = SMALL_FONT.render(tip, True, HEADER_COLOR) else: tip_surface = SMALL_FONT.render(tip, True, (120, 120, 140)) self.screen.blit(tip_surface, (tips_x, tips_y + i * 28)) def draw(self): """绘制界面""" self.screen.fill(BACKGROUND_COLOR) # 绘制标题 title_text = TITLE_FONT.render("⚖️ 重量单位转换器", True, HEADER_COLOR) title_rect = title_text.get_rect(center=(WINDOW_WIDTH // 2, 40)) self.screen.blit(title_text, title_rect) # 绘制分隔线 pygame.draw.line(self.screen, HEADER_COLOR, (40, 70), (WINDOW_WIDTH - 40, 70), 2) # 绘制左侧提示区域 self.draw_tips() # 右侧主区域起始位置 right_area_x = 200 # 绘制输入区域标签 input_label = SMALL_FONT.render("输入重量:", True, TEXT_COLOR) self.screen.blit(input_label, (right_area_x, 80)) # 绘制输入框 color = INPUT_BOX_ACTIVE_COLOR if self.input_active else INPUT_BOX_COLOR pygame.draw.rect(self.screen, color, self.input_rect, border_radius=8) pygame.draw.rect(self.screen, HEADER_COLOR, self.input_rect, 2, border_radius=8) # 绘制输入文本 input_surface = FONT.render(self.input_text, True, TEXT_COLOR) # 如果文本太长，缩小字体 if input_surface.get_width() > self.input_rect.width - 20: smaller_font = pygame.font.Font(None, 28) input_surface = smaller_font.render( self.input_text, True, TEXT_COLOR) self.screen.blit(input_surface, (self.input_rect.x + 12, self.input_rect.y + 10)) # 绘制单位标签 from_label = SMALL_FONT.render("从:", True, TEXT_COLOR) to_label = SMALL_FONT.render("到:", True, TEXT_COLOR) self.screen.blit(from_label, (right_area_x, 160)) self.screen.blit(to_label, (right_area_x, 250)) # 绘制下拉菜单 self.draw_dropdown(self.from_dropdown_rect, self.from_unit, self.show_from_dropdown, self.from_scroll, True) self.draw_dropdown(self.to_dropdown_rect, self.to_unit, self.show_to_dropdown, self.to_scroll, False) # 绘制转换按钮 mouse_pos = pygame.mouse.get_pos() btn_color = BUTTON_HOVER_COLOR if self.convert_button.collidepoint( mouse_pos) else BUTTON_COLOR pygame.draw.rect(self.screen, btn_color, self.convert_button, border_radius=12) pygame.draw.rect(self.screen, (255, 255, 255), self.convert_button, 2, border_radius=12) convert_text = FONT.render("转 换", True, (255, 255, 255)) convert_rect = convert_text.get_rect(center=self.convert_button.center) self.screen.blit(convert_text, convert_rect) # 绘制清空按钮 clear_color = (180, 180, 200) if self.clear_button.collidepoint( mouse_pos) else (160, 160, 180) pygame.draw.rect(self.screen, clear_color, self.clear_button, border_radius=10) pygame.draw.rect(self.screen, HEADER_COLOR, self.clear_button, 1, border_radius=10) clear_text = SMALL_FONT.render("清 空", True, TEXT_COLOR) clear_rect = clear_text.get_rect(center=self.clear_button.center) self.screen.blit(clear_text, clear_rect) # 显示结果 result_y = WINDOW_HEIGHT - 60 if self.result is not None: # 获取单位符号 from_symbol = self.from_unit.split( " (")[1][:-1] if " (" in self.from_unit else self.from_unit to_symbol = self.to_unit.split( " (")[1][:-1] if " (" in self.to_unit else self.to_unit result_text = FONT.render(f"{self.input_text} {from_symbol} = {self.result} {to_symbol}", True, TEXT_COLOR) result_bg = pygame.Rect(40, result_y - 12, WINDOW_WIDTH - 80, 50) pygame.draw.rect(self.screen, RESULT_BG_COLOR, result_bg, border_radius=10) pygame.draw.rect(self.screen, HEADER_COLOR, result_bg, 1, border_radius=10) result_rect = result_text.get_rect( center=(WINDOW_WIDTH // 2, result_y + 13)) self.screen.blit(result_text, result_rect) elif self.error_message is not None: error_text = SMALL_FONT.render( self.error_message, True, (220, 80, 80)) error_rect = error_text.get_rect( center=(WINDOW_WIDTH // 2, result_y + 13)) self.screen.blit(error_text, error_rect) pygame.display.flip() def run(self): """主循环""" while self.running: self.handle_events() self.draw() self.clock.tick(60) pygame.quit() sys.exit() if __name__ == "__main__": converter = WeightConverter() converter.run()