I'm trying to put an image inside the Canvas that has the same width as the Canvas but the height is according to the aspect ratio, and using a Scrollbar to scroll the same. Here's the relevant part of the code.
#Canvas and Scrollbar
img_canvas = Canvas(main_frame, height = height, width = width+15)
vsb = Scrollbar(img_canvas, orient = 'vertical')
vsb.pack(side = 'right', fill = 'y')
vsb.configure(command = img_canvas.yview)
canvas.config(yscrollcommand = vsb.set)
text.window_create("end", window = img_canvas)
text.insert("end", "\n")
#Insert Image into the Canvas
im = Image.open(str(opath)+"//Ques_"+str(temp)+".png")
w, h = im.size
im = im.resize((width, int((h/w)*width)), Image.ANTIALIAS)
img = ImageTk.PhotoImage(im)
ques = Label(img_canvas, image = img)
ques.image = img
ques.pack(side = 'left', expand = False)
The problem I am encountering is that the image expands completely in y, and hence can't be scrolled.
I want to contain the part of the image that fits into the Canvas's dimensions and the rest can be scrolled.
You have to use create_image to put an image on a canvas and have it be scrollable. You can't use pack or place or grid. You don't need to put the image in a label first, unless you specifically want it to be a label with a border. In that case, you need to use create_window to add the label to the canvas.
Related
I want to put this image on the canvas, only without borders, or with the border of the canvas color. I already put border size = 0 but it didn't work.
What do I do please?
image1 = Image.open("imagem2.png")
image = image1.resize((120, 120), Image.ANTIALIAS)
test = ImageTk.PhotoImage(image)
label1 = ttk.Label(image=test, borderwidth=0)
label1.image = test
# Position image
label1.place(x=0, y=230)
I would like to take these edges
I want to center an image in tkinter canvas. The only thing I could think of is using anchor = 'c' but that does not seem to work. I have also tried using it on the stage.
def newsetup(filelocation):
global width, height
for widgets in root.winfo_children():
widgets.destroy()
stage = Canvas(root, width = 1000, height = 700, highlightbackground = 'red', highlightthickness = 2)
stage.pack()
imgtk = ImageTk.PhotoImage(Image.open(filelocation))
stage.create_image(stage.winfo_width() + 2, stage.winfo_height() + 2, image = imgtk, anchor = CENTER)
stage.image = imgtk
if you want to center on canvas then you need
stage.winfo_width()/2, stage.winfo_height()/2
(even without anchor= which as default has value center)
But if you put image before it runs mainloop() then stage.winfo_width() stage.winfo_height() gives 0,0 instead of expected width, height (because mainloop creates window and it sets all sizes for widgets) and it may need root.update() to run mainloop once and it will calculate all sizes.
import tkinter as tk
from PIL import ImageTk, Image
root = tk.Tk()
stage = tk.Canvas(root, width=1000, height=700)
stage.pack()
root.update() # force `mainloop()` to calculate current `width`, `height` for canvas
# and later `stage.winfo_width()` `stage.winfo_height()` will get correct values instead `0`
#imgtk = ImageTk.PhotoImage(Image.open('lenna.png'))
imgtk = ImageTk.PhotoImage(file='lenna.png')
stage.create_image((stage.winfo_width()/2, stage.winfo_height()/2), image=imgtk, anchor='center')
stage.image = imgtk
root.mainloop()
Result:
Image Lenna from Wikipedia.
EDIT:
If you want to keep it centered when you resize window then you can bind event <Configure> to canvas and it will execute assigned function - and it can move image.
But it needs image ID which you can get when you create image
img_id = stage.create_image(...)
Because <Configure> is executed when it creates window so code doesn't need root.update() because on_resize() will set correct position at start.
import tkinter as tk
from PIL import ImageTk, Image
# --- functions ---
def on_resize(event):
# it respects anchor
x = event.width/2
y = event.height/2
stage.coords(img_id, x, y)
# it DOESN'T respects anchor so you have to add offset
#x = (event.width - imgtk.width())/2
#y = (event.height - imgtk.height())/2
#stage.moveto(img_id, x, y) # doesn't respect anchor
#stage.itemconfigure(img_id, ...)
# --- main ---
root = tk.Tk()
stage = tk.Canvas(root, width=1000, height=700)
stage.pack(fill='both', expand=True)
#root.update() # force `mainloop()` to calculate current `width`, `height` for canvas
# and later `stage.winfo_width()` `stage.winfo_height()` will get correct values instead `0`
#imgtk = ImageTk.PhotoImage(Image.open('lenna.png'))
imgtk = ImageTk.PhotoImage(file='lenna.png')
img_id = stage.create_image((stage.winfo_width()/2, stage.winfo_height()/2), image=imgtk, anchor='center')
stage.image = imgtk
stage.bind('<Configure>', on_resize) # run function when Canvas change size
root.mainloop()
I have setup 2 panels in a frame as so:
frameA = Frame(master)
frameA.pack(side=LEFT, fill=BOTH, expand=YES)
frameB = Frame(master)
frameB.pack(side=RIGHT, fill=BOTH, expand=YES)
recale = 0.4
self.img = ImageTk.PhotoImage(img.resize((int(rescale*width), int(recale*height)), Image.ANTIALIAS)
self.panelA = Label(frameA, image=self.img)
self.pabelA.pack(side=LEFT, fill=BOTH, expand=YES)
self.panelB = Label(frameB, image=self.img)
self.pabelB.pack(side=LEFT, fill=BOTH, expand=YES)
Now, the size of the 2 panels are determined by the image size which I have resized to 0.4 times the original size. How can I dynamically set rescale such that the width of each of the panels takes up the entire width of the master frame when I press the maximize button(this is not a button I made, but rather the little square button next to minimize, and close on the top right) on the GUI?
When you use pack(fill=BOTH, expand=YES) then tkinter automatically resizes Frame and Label to fit window - so you don't have to resize it manually. But it will never resize PhotoImage and Image so it may looks like it doesn't resize Label and Frame. So your real problem probably is "how to resize Image when you change window's size"
Using
root.bind('<Configure>', on_resize)
you can run function when window changed size and then you can generate new image and replace in Label
This function will be executed not only for window but also fro every widget in window so I use str(event.widget) == '.' to resize it only when it is executed for window.
import tkinter as tk
from PIL import Image, ImageTk
def on_resize(event):
global rescaled_img
global photo
#print('[DEBUG] on_resize:', event.widget)
# resize only when root window changes size
if str(event.widget) == '.':
# generate new image
width = event.width//2 # -2 # -2*border
height = event.height # -2 # -2*border
rescaled_img = original_img.resize((width, height), Image.ANTIALIAS)
photo = ImageTk.PhotoImage(rescaled_img)
# replace images in labels
label_left['image'] = photo
label_right['image'] = photo
# ---- main ---
# resize at start
original_img = Image.open('image.jpg')
rescale = 0.4
width = int(rescale * original_img.width)
height = int(rescale * original_img.height)
rescaled_img = original_img.resize((width, height), Image.ANTIALIAS)
root = tk.Tk()
photo = ImageTk.PhotoImage(rescaled_img)
label_left = tk.Label(root, image=photo, border=0) # if border > 0 then you have to use `-2*border` in on_resize
label_left.pack(side='left', fill='both', expand=True)
label_right = tk.Label(root, image=photo, border=0) # if border > 0 then you have to use `-2*border` in on_resize
label_right.pack(side='left', fill='both', expand=True)
# resize when window changed size
root.bind('<Configure>', on_resize)
root.mainloop()
I tried to bind to label as you can see in some code in Tkinter resize background image to window size but it didn't work correctly - at start it makes images bigger and bigger till window fill all screen. Or at start it makes images small and small till window has no size.
if Label has border bigger then 0 then you have to substract 2*border from image size.
I want to show an image and draw a coordinate system(x-axe, y-axe) on top of it.
I can show the image
img = ImageTk.PhotoImage(Image.open(path).resize((400,400),Image.ANTIALIAS))
panel = tk.Label(root,image = img, width = 400, height = 400s)
panel.pack(size= "bottom", fill = "both", expand = "yes")
panel.place(rely = 073, rely = 0.5s)
I can also draw a line for the x-axe/y-axe(it would be even better if you know a way to draw a flash instead of a line)
canvas = Canvas(root)
canvas.create_line(x0,y0,x1,y1)
canvas.pack()
What I cannot do is place this line on top of the image. I tried using canvas.place(), but when I put it on top of the image I cannot see the image anymore. Is there a way to make the canvas transparent ? Or is there something else I can do ? I'm new to Tkinter.
Thanks.
EDIT: apparently it is not possible to make a canvas transparent Transparent canvas in tkinter python
But can I add a background image in the canvas and then draw the line, so that I can see both ?
You have to place the image on the canvas and then put the axis lines on top of it:
import Tkinter as tk
from PIL import Image, ImageTk
root = tk.Tk()
img_path = 'water-drop-splash.png'
img = ImageTk.PhotoImage(Image.open(img_path).resize((400,400), Image.ANTIALIAS))
canvas = tk.Canvas(root, height=400, width=400)
canvas.create_image(200, 200, image=img)
canvas.create_line(0, 200, 399, 200, dash=(2,2)) # x-axis
canvas.create_line(200, 0, 200, 399, dash=(2,2)) # y-axis
canvas.pack()
root.mainloop()
Ta-da!
I've got a problem.
I want to realize an Inputfield ( Text() ) in front of an image ( ImageTk.Photoimage() )
But the white background of the Inputfield covers the image. So my Question is, how can i set the background of Text() to full transparency?
from Tkinter import *
from PIL import ImageTk, Image
path = 'C:/Users/David/Pictures/5.png'
root = Tk()
img = ImageTk.PhotoImage(Image.open(path))
panel = Label(root, image = img)
panel.pack(side = "bottom", fill = "both", expand = "yes")
Text(root).pack()
root.mainloop()
Make a Text widget at full width of the parent window ( and remain that )
Text(root).pack( side = "BOTTOM", fill ="X", expand = 1 )
or
Text(root).grid( sticky = W+S+E )
Make a Text widget have a transparent background
Ref. >>> https://stackoverflow.com/a/18479446/3666197
to make a transparent background:
if you pack your image into a canvas widget then you can post text over the top of it using
canvas.create_text()
a good reference for the canvas widget can be found here:
http://effbot.org/tkinterbook/canvas.htm
to control how wide the widget packs itself
If you are using pack you could use either:
Text.pack(fill="x")
or:
Text.pack(fill="x", expand=True)
# this one would also make it expand if you resize the window
or if you use grid:
Text.grid(sticky="nesw")
and to make it expand if you resize window:
parent.grid_columnconfigure(columnnumber, weight=1)
if you use grids you can change the relative rate at which your widgets expand by changing the weight of that row/column
James