如何使用 guizero 和事件在 python 中绘制三角形 Python HeadFirst Book v2

问题描述

如何在python中使用guizero和鼠标绘制三角形。 Python HeadFirst Book v2 我在配置使用 guizero 绘制三角形的工具时遇到了困难 该练习可在 HeadFirst Python v2 一书中找到。我们正在编写一个绘画应用程序。我们需要使用鼠标来绘制一些形状。 有人可以看看代码并提出解决方案

from guizero import App,Drawing,Combo,Slider
from guizero.Box import Box
from guizero.Text import Text

def draw(event):
    if shape.value=="line":
        painting.line(
            painting.last_event.x,painting.last_event.y,event.x,event.y,color=color.value,width=width.value
        )
        painting.last_event=event

    if shape.value=="rectangle":
        if painting.last_shape is not None:
            painting.delete(painting.last_shape)

        rectangle= painting.rectangle(
            painting.first_event.x,painting.first_event.y,)
        painting.last_shape=rectangle
    
    if shape.value=="oval":
        if painting.last_shape is not None:
            painting.delete(painting.last_shape)

        oval= painting.oval(
            painting.first_event.x,)
        painting.last_shape=oval

    if shape.value=="Triangle":
        if painting.last_shape is not None:
            painting.delete(painting.last_shape)

        meio=(painting.first_event.x+painting.last_event.x)/2
        triangle= painting.triangle(                
            meio,painting.last_event.x,painting.first_event.x,)
        painting.last_shape=triangle

def start(event):
    painting.last_event=event
    painting.first_event=event
    painting.last_shape=event

#----------------------------
#App
#----------------------------

app=App("Paint")

caixa_ferramentas=Box(app,border=True,align="top",width="fill")

Text(caixa_ferramentas,text="Ferramentas:",align="left")
shape=Combo(caixa_ferramentas,options=["line","rectangle","oval","Triangle"],align="left")

Text(caixa_ferramentas,text="Cor:",align="left")
color=Combo(caixa_ferramentas,options=["black","white","red","green","blue"],text="Tamanho:",align="left")
width=Slider(caixa_ferramentas,start=1,end=10,align="left")


painting=Drawing(app,width="fill",height="fill")
painting.when_left_button_pressed=start
painting.when_mouse_dragged=draw


app.display()

解决方法

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