2024-05-19 15:06:14 发布
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这是关于Draw rectangle on mouse click [Python]的。我尝试了第一种解决方案,效果很好。有人能告诉我,如果我想看到正在绘制的矩形,并且一旦鼠标按钮被释放,矩形就固定了,因为我只能在释放按钮后看到绘制的矩形,怎么办。在
任何形式的帮助都将被感激。在
我根据引用的问题修改了代码。现在,当鼠标在画布上拖动时,它将显示矩形。画布显示Lena图像。在
import tkinter as tk # this is in python 3.4. For python 2.x import Tkinter from PIL import Image, ImageTk class ExampleApp(tk.Tk): def __init__(self): tk.Tk.__init__(self) self.x = self.y = 0 self.canvas = tk.Canvas(self, width=512, height=512, cursor="cross") self.canvas.pack(side="top", fill="both", expand=True) self.canvas.bind("<ButtonPress-1>", self.on_button_press) self.canvas.bind("<B1-Motion>", self.on_move_press) self.canvas.bind("<ButtonRelease-1>", self.on_button_release) self.rect = None self.start_x = None self.start_y = None self._draw_image() def _draw_image(self): self.im = Image.open('./resource/lena.jpg') self.tk_im = ImageTk.PhotoImage(self.im) self.canvas.create_image(0,0,anchor="nw",image=self.tk_im) def on_button_press(self, event): # save mouse drag start position self.start_x = event.x self.start_y = event.y # create rectangle if not yet exist #if not self.rect: self.rect = self.canvas.create_rectangle(self.x, self.y, 1, 1, fill="black") def on_move_press(self, event): curX, curY = (event.x, event.y) # expand rectangle as you drag the mouse self.canvas.coords(self.rect, self.start_x, self.start_y, curX, curY) def on_button_release(self, event): pass if __name__ == "__main__": app = ExampleApp() app.mainloop()
黑色方块画在图像的顶部。希望这有帮助。在
我根据引用的问题修改了代码。现在,当鼠标在画布上拖动时,它将显示矩形。画布显示Lena图像。在
黑色方块画在图像的顶部。希望这有帮助。在
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