DrawImage删除- PySimpleGUI

Question

在PySimpleGUI中仅删除画布上的一个DrawImage需要帮助。画布加载了一个背景图像(画布的100%)，并在其上有5个其他DrawImage项(大小不一)。当我点击这5张图片中的一张时，我希望它消失(删除)，但背景图片留下来。

使用来自鼠标点击的坐标的get_figures_at_location来删除我想要消失的图像。但我的程序也删除了背景。

有什么想法吗？在搜索了许多论坛后，找不到这样做的方法。

Answer 1

使用draw_image保存绘制背景图片时返回的id，通过id确认不是背景图片后删除。

draw = window['-GRAPH-']
bg_id = draw.draw_image(filename=filename)

...

figures = draw.get_figures_at_location((x, y))
if figures and figures[0] != bg_id:
    draw.delete_figure(figures[-1])    # index -1 for last one or top one

下面的代码显示了在鼠标点击图形后删除所有图形。(请记住将其替换为您的背景图像)

from io import BytesIO
from random import randint
from PIL import Image
import PySimpleGUI as sg

def image_to_data(im):
    """
    Image object to bytes object.
    : Parameters
      im - Image object
    : Return
      bytes object.
    """
    with BytesIO() as output:
        im.save(output, format="PNG")
        data = output.getvalue()
    return data

width, height = size = (640, 480)

im = Image.open("D:/desktop.png")
new_im = im.resize(size)

font = ("Courier New", 11)
sg.theme("DarkBlue3")
sg.set_options(font=font)

layout = [
    [sg.Button('Redraw')],
    [sg.Graph(size, (0, 0), size, enable_events=True, key='-GRAPH-')],
]
window = sg.Window('Title', layout, finalize=True)
draw = window['-GRAPH-']

background = draw.draw_image(data=image_to_data(new_im), location=(0, height))
ids = [draw.draw_image(data=emoji, location=(randint(0, width), randint(0, height)))
    for emoji in sg.EMOJI_BASE64_HAPPY_LIST]
print(ids)
while True:

    event, values = window.read()

    if event in (sg.WINDOW_CLOSED, 'Exit'):
        break
    elif event == '-GRAPH-':
        location = values[event]
        figures = draw.get_figures_at_location(location)
        for figure in figures:
            if figure != background:
                draw.delete_figure(figure)
                ids.remove(figure)
    elif event == 'Redraw':
        for figure in ids:
            draw.delete_figure(figure)
        ids = [draw.draw_image(data=emoji, location=(randint(0, width), randint(0, height)))
            for emoji in sg.EMOJI_BASE64_HAPPY_LIST]

window.close()

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