Python之tkinter：动态演示调用python库的tkinter带你进入GUI世界(Canvas)——Jason niu

#tkinter应用案例：在Canvas画布上绘制线条、矩形等
from tkinter import *

root = Tk()
root.title("Jason niu工作室")
theLabel=tk.Label(root,text="进入GUI世界，请开始你的表演！\n(Canvas画布可以让你尽情挥洒)")
theLabel.pack()

w = Canvas(root,width=400,height=200,background="white")
w.pack()

w.create_line(0,100,400,100,fill="Green")
w.create_line(200,0,200,200,fill="red",dash=(4,4))
w.create_rectangle(100,50,300,150,fill="blue")

mainloop()

#tkinter应用案例：将Canvas画布上绘制线条、矩形等进行更改、删除等操作
from tkinter import *

root = Tk()
root.title("Jason niu工作室")
theLabel=tk.Label(root,text="进入GUI世界，请开始你的表演！\n(更改、删除Canvas画布上的内容)")
theLabel.pack()

w = Canvas(root,width=200,height=100,background="white")
w.pack()

line1 = w.create_line(0,50,200,50,fill="yellow")
line2 = w.create_line(100,0,100,100,fill="red",dash=(4,4))
rect1 = w.create_rectangle(50,25,150,75,fill="blue")

#修改的三个方法coords、itemconfig、delete(move)
w.coords(line1,0,25,200,25)
w.itemconfig(rect1,fill = "red")
w.delete(line2)

Button(root,text="删除全部",command=(lambda x=ALL:w.delete(x))).pack()

mainloop()

#tkinter应用案例：将Canvas画布上绘制对角线、矩形、添加文本内容
from tkinter import *

root = Tk()
root.title("Jason niu工作室")
theLabel=tk.Label(root,text="进入GUI世界，请开始你的表演！\n(更改、删除Canvas画布上的内容)")
theLabel.pack()

w = Canvas(root,width=400,height=200)
w.pack()

w.create_line(0,0,400,200,fill="green",width=3)
w.create_line(400,0,0,200,fill="green",width=3)
w.create_rectangle(80,40,320,160,fill="green")
w.create_rectangle(130,70,270,130,fill="yellow")

w.create_text(200,100,text="Jason niu工作室")

mainloop()

#tkinter应用案例：在Canvas画布上绘制对角线、椭圆形、添加文本内容
from tkinter import *

root = Tk()
root.title("Jason niu工作室")
theLabel=tk.Label(root,text="进入GUI世界，请开始你的表演！\n(在Canvas画布上绘制对角线、椭圆形、添加文本内容)")
theLabel.pack()

w = Canvas(root,width=200,height=100)
w.pack()

w.create_rectangle(40,20,160,80,dash=(4,4))
w.create_oval(40,20,160,80,fill="blue")
w.create_text(100,50,text="Jason niu工作室")

mainloop()

#tkinter应用案例：Canvas画布上绘制五角星
from tkinter import *
import math as m

root = Tk()
root.title("Jason niu工作室")
theLabel=tk.Label(root,text="进入GUI世界，请开始你的表演！\n(我就是这么任性，绘制五角星！)")
theLabel.pack()

w = Canvas(root,width=200,height=100)
w.pack()

center_x = 100
center_y = 50
r=50

point = [
# 左上点
center_x - int(r*m.sin(2*m.pi/5)),
center_y - int(r*m.cos(2*m.pi/5)),
# 右上点
center_x + int(r*m.sin(2*m.pi/5)),
center_y - int(r*m.cos(2*m.pi/5)),
# 左下角
center_x - int(r*m.sin(m.pi/5)),
center_y + int(r*m.cos(m.pi/5)),
# 顶点
center_x,
center_y -r,
# 右下点
center_x + int(r*m.sin(m.pi/5)),
center_y + int(r*m.cos(m.pi/5)),

]

w.create_polygon(point,outline="blue",fill="red")

mainloop()

#tkinter应用案例：Canvas画布上随意绘画
from tkinter import *
import math as m

root = Tk()
root.title("Jason niu工作室")
theLabel=tk.Label(root,text="进入GUI世界，请开始你的表演！\n(我是神笔马良，想怎么画就怎么画！)")
theLabel.pack()

w = Canvas(root,width=400,height=200)
w.pack()

def paint(event):
x1,y1 = (event.x-1),(event.y-1)
x2,y2 = (event.x+1),(event.y+1)
w.create_oval(x1,y1,x2,y2,fill="blue")

w.bind("<B1-Motion>",paint)  #将画布与鼠标左键绑定，绑定方法是paint方法

Label(root,text="把鼠标左键当作你的画笔，绘制你梦想的世界吧......").pack(side=BOTTOM)

mainloop()