web-dev-qa-db-ja.com

Tkinterキャンバスズーム+移動/パン

Tkinterのキャンバスウィジェットには、次の機能が組み込まれています。

  • canvas.scan_markおよびcanvas.scan_dragtoを使用してキャンバスを移動/パン(たとえば、クリック+ドラッグ)します。詳細は この質問 を参照してください

  • canvas.scaleを使用してキャンバス上のベクター要素をズームしますが、残念ながら、これは 機能しない キャンバス上のビットマップイメージの場合

さいわい、 このメソッド は、画像のズームを許可します(画像のズーム部分を手動で再描画することにより)。だが:

  1. キャンバスの特定の部分を再描画しているため、移動/パン機能は機能しなくなります...

  2. 移動/パンを許可するには、現在表示されている領域よりも多くレンダリングする必要があります。キャンバスに1000x1000のビットマップがあり、50倍に拡大したいとします。メモリ内に50.000 x 50.000ピクセルのビットマップが存在しないようにするにはどうすればよいでしょうか。 (RAMの2.5ギガピクセルは大きすぎます。)ビューポートのみをレンダリングすることも、現在のビューポートよりも少し多くしてパンを許可することも考えられますが、一度パンするとどうなるかによって、レンダリングされたゾーンの端?

Tkinterキャンバスで移動/パン+ズーム機能を使用して、画像で機能する方法を教えてください

18
Basj

高度なズームの例。 Googleマップのように。

ビデオの例( 長いビデオはこちら ):

画像全体ではなく、タイルのみをズームします。したがって、ズームされたタイルは一定のメモリを占有し、大きなズームのために巨大なサイズ変更された画像でそれを詰め込みません。簡略化されたズームの例 ここを見る の場合。

Windows 7 64ビットおよびPython 3.6.2。

スクリプトの最後にイメージへのパスを配置することを忘れないでください。

# -*- coding: utf-8 -*-
# Advanced zoom example. Like in Google Maps.
# It zooms only a tile, but not the whole image. So the zoomed tile occupies
# constant memory and not crams it with a huge resized image for the large zooms.
import random
import tkinter as tk
from tkinter import ttk
from PIL import Image, ImageTk

class AutoScrollbar(ttk.Scrollbar):
    ''' A scrollbar that hides itself if it's not needed.
        Works only if you use the grid geometry manager '''
    def set(self, lo, hi):
        if float(lo) <= 0.0 and float(hi) >= 1.0:
            self.grid_remove()
        else:
            self.grid()
            ttk.Scrollbar.set(self, lo, hi)

    def pack(self, **kw):
        raise tk.TclError('Cannot use pack with this widget')

    def place(self, **kw):
        raise tk.TclError('Cannot use place with this widget')

class Zoom_Advanced(ttk.Frame):
    ''' Advanced zoom of the image '''
    def __init__(self, mainframe, path):
        ''' Initialize the main Frame '''
        ttk.Frame.__init__(self, master=mainframe)
        self.master.title('Zoom with mouse wheel')
        # Vertical and horizontal scrollbars for canvas
        vbar = AutoScrollbar(self.master, orient='vertical')
        hbar = AutoScrollbar(self.master, orient='horizontal')
        vbar.grid(row=0, column=1, sticky='ns')
        hbar.grid(row=1, column=0, sticky='we')
        # Create canvas and put image on it
        self.canvas = tk.Canvas(self.master, highlightthickness=0,
                                xscrollcommand=hbar.set, yscrollcommand=vbar.set)
        self.canvas.grid(row=0, column=0, sticky='nswe')
        self.canvas.update()  # wait till canvas is created
        vbar.configure(command=self.scroll_y)  # bind scrollbars to the canvas
        hbar.configure(command=self.scroll_x)
        # Make the canvas expandable
        self.master.rowconfigure(0, weight=1)
        self.master.columnconfigure(0, weight=1)
        # Bind events to the Canvas
        self.canvas.bind('<Configure>', self.show_image)  # canvas is resized
        self.canvas.bind('<ButtonPress-1>', self.move_from)
        self.canvas.bind('<B1-Motion>',     self.move_to)
        self.canvas.bind('<MouseWheel>', self.wheel)  # with Windows and MacOS, but not Linux
        self.canvas.bind('<Button-5>',   self.wheel)  # only with Linux, wheel scroll down
        self.canvas.bind('<Button-4>',   self.wheel)  # only with Linux, wheel scroll up
        self.image = Image.open(path)  # open image
        self.width, self.height = self.image.size
        self.imscale = 1.0  # scale for the canvaas image
        self.delta = 1.3  # zoom magnitude
        # Put image into container rectangle and use it to set proper coordinates to the image
        self.container = self.canvas.create_rectangle(0, 0, self.width, self.height, width=0)
        # Plot some optional random rectangles for the test purposes
        minsize, maxsize, number = 5, 20, 10
        for n in range(number):
            x0 = random.randint(0, self.width - maxsize)
            y0 = random.randint(0, self.height - maxsize)
            x1 = x0 + random.randint(minsize, maxsize)
            y1 = y0 + random.randint(minsize, maxsize)
            color = ('red', 'orange', 'yellow', 'green', 'blue')[random.randint(0, 4)]
            self.canvas.create_rectangle(x0, y0, x1, y1, fill=color, activefill='black')
        self.show_image()

    def scroll_y(self, *args, **kwargs):
        ''' Scroll canvas vertically and redraw the image '''
        self.canvas.yview(*args, **kwargs)  # scroll vertically
        self.show_image()  # redraw the image

    def scroll_x(self, *args, **kwargs):
        ''' Scroll canvas horizontally and redraw the image '''
        self.canvas.xview(*args, **kwargs)  # scroll horizontally
        self.show_image()  # redraw the image

    def move_from(self, event):
        ''' Remember previous coordinates for scrolling with the mouse '''
        self.canvas.scan_mark(event.x, event.y)

    def move_to(self, event):
        ''' Drag (move) canvas to the new position '''
        self.canvas.scan_dragto(event.x, event.y, gain=1)
        self.show_image()  # redraw the image

    def wheel(self, event):
        ''' Zoom with mouse wheel '''
        x = self.canvas.canvasx(event.x)
        y = self.canvas.canvasy(event.y)
        bbox = self.canvas.bbox(self.container)  # get image area
        if bbox[0] < x < bbox[2] and bbox[1] < y < bbox[3]: pass  # Ok! Inside the image
        else: return  # zoom only inside image area
        scale = 1.0
        # Respond to Linux (event.num) or Windows (event.delta) wheel event
        if event.num == 5 or event.delta == -120:  # scroll down
            i = min(self.width, self.height)
            if int(i * self.imscale) < 30: return  # image is less than 30 pixels
            self.imscale /= self.delta
            scale        /= self.delta
        if event.num == 4 or event.delta == 120:  # scroll up
            i = min(self.canvas.winfo_width(), self.canvas.winfo_height())
            if i < self.imscale: return  # 1 pixel is bigger than the visible area
            self.imscale *= self.delta
            scale        *= self.delta
        self.canvas.scale('all', x, y, scale, scale)  # rescale all canvas objects
        self.show_image()

    def show_image(self, event=None):
        ''' Show image on the Canvas '''
        bbox1 = self.canvas.bbox(self.container)  # get image area
        # Remove 1 pixel shift at the sides of the bbox1
        bbox1 = (bbox1[0] + 1, bbox1[1] + 1, bbox1[2] - 1, bbox1[3] - 1)
        bbox2 = (self.canvas.canvasx(0),  # get visible area of the canvas
                 self.canvas.canvasy(0),
                 self.canvas.canvasx(self.canvas.winfo_width()),
                 self.canvas.canvasy(self.canvas.winfo_height()))
        bbox = [min(bbox1[0], bbox2[0]), min(bbox1[1], bbox2[1]),  # get scroll region box
                max(bbox1[2], bbox2[2]), max(bbox1[3], bbox2[3])]
        if bbox[0] == bbox2[0] and bbox[2] == bbox2[2]:  # whole image in the visible area
            bbox[0] = bbox1[0]
            bbox[2] = bbox1[2]
        if bbox[1] == bbox2[1] and bbox[3] == bbox2[3]:  # whole image in the visible area
            bbox[1] = bbox1[1]
            bbox[3] = bbox1[3]
        self.canvas.configure(scrollregion=bbox)  # set scroll region
        x1 = max(bbox2[0] - bbox1[0], 0)  # get coordinates (x1,y1,x2,y2) of the image tile
        y1 = max(bbox2[1] - bbox1[1], 0)
        x2 = min(bbox2[2], bbox1[2]) - bbox1[0]
        y2 = min(bbox2[3], bbox1[3]) - bbox1[1]
        if int(x2 - x1) > 0 and int(y2 - y1) > 0:  # show image if it in the visible area
            x = min(int(x2 / self.imscale), self.width)   # sometimes it is larger on 1 pixel...
            y = min(int(y2 / self.imscale), self.height)  # ...and sometimes not
            image = self.image.crop((int(x1 / self.imscale), int(y1 / self.imscale), x, y))
            imagetk = ImageTk.PhotoImage(image.resize((int(x2 - x1), int(y2 - y1))))
            imageid = self.canvas.create_image(max(bbox2[0], bbox1[0]), max(bbox2[1], bbox1[1]),
                                               anchor='nw', image=imagetk)
            self.canvas.lower(imageid)  # set image into background
            self.canvas.imagetk = imagetk  # keep an extra reference to prevent garbage-collection

path = 'doge.jpg'  # place path to your image here
root = tk.Tk()
app = Zoom_Advanced(root, path=path)
root.mainloop()

編集:

さらに高度なズームを作成しました。大きな画像をスムーズにズームするための「画像ピラミッド」があり、数ギガバイトまでの巨大なTIFFファイルを開いてズームすることさえできます。

バージョン3.0は、Windows 7 64ビットおよびPython 3.7。

# -*- coding: utf-8 -*-
# Advanced zoom for images of various types from small to huge up to several GB
import math
import warnings
import tkinter as tk

from tkinter import ttk
from PIL import Image, ImageTk

class AutoScrollbar(ttk.Scrollbar):
    """ A scrollbar that hides itself if it's not needed. Works only for grid geometry manager """
    def set(self, lo, hi):
        if float(lo) <= 0.0 and float(hi) >= 1.0:
            self.grid_remove()
        else:
            self.grid()
            ttk.Scrollbar.set(self, lo, hi)

    def pack(self, **kw):
        raise tk.TclError('Cannot use pack with the widget ' + self.__class__.__name__)

    def place(self, **kw):
        raise tk.TclError('Cannot use place with the widget ' + self.__class__.__name__)

class CanvasImage:
    """ Display and zoom image """
    def __init__(self, placeholder, path):
        """ Initialize the ImageFrame """
        self.imscale = 1.0  # scale for the canvas image zoom, public for outer classes
        self.__delta = 1.3  # zoom magnitude
        self.__filter = Image.ANTIALIAS  # could be: NEAREST, BILINEAR, BICUBIC and ANTIALIAS
        self.__previous_state = 0  # previous state of the keyboard
        self.path = path  # path to the image, should be public for outer classes
        # Create ImageFrame in placeholder widget
        self.__imframe = ttk.Frame(placeholder)  # placeholder of the ImageFrame object
        # Vertical and horizontal scrollbars for canvas
        hbar = AutoScrollbar(self.__imframe, orient='horizontal')
        vbar = AutoScrollbar(self.__imframe, orient='vertical')
        hbar.grid(row=1, column=0, sticky='we')
        vbar.grid(row=0, column=1, sticky='ns')
        # Create canvas and bind it with scrollbars. Public for outer classes
        self.canvas = tk.Canvas(self.__imframe, highlightthickness=0,
                                xscrollcommand=hbar.set, yscrollcommand=vbar.set)
        self.canvas.grid(row=0, column=0, sticky='nswe')
        self.canvas.update()  # wait till canvas is created
        hbar.configure(command=self.__scroll_x)  # bind scrollbars to the canvas
        vbar.configure(command=self.__scroll_y)
        # Bind events to the Canvas
        self.canvas.bind('<Configure>', lambda event: self.__show_image())  # canvas is resized
        self.canvas.bind('<ButtonPress-1>', self.__move_from)  # remember canvas position
        self.canvas.bind('<B1-Motion>',     self.__move_to)  # move canvas to the new position
        self.canvas.bind('<MouseWheel>', self.__wheel)  # zoom for Windows and MacOS, but not Linux
        self.canvas.bind('<Button-5>',   self.__wheel)  # zoom for Linux, wheel scroll down
        self.canvas.bind('<Button-4>',   self.__wheel)  # zoom for Linux, wheel scroll up
        # Handle keystrokes in idle mode, because program slows down on a weak computers,
        # when too many key stroke events in the same time
        self.canvas.bind('<Key>', lambda event: self.canvas.after_idle(self.__keystroke, event))
        # Decide if this image huge or not
        self.__huge = False  # huge or not
        self.__huge_size = 14000  # define size of the huge image
        self.__band_width = 1024  # width of the tile band
        Image.MAX_IMAGE_PIXELS = 1000000000  # suppress DecompressionBombError for the big image
        with warnings.catch_warnings():  # suppress DecompressionBombWarning
            warnings.simplefilter('ignore')
            self.__image = Image.open(self.path)  # open image, but down't load it
        self.imwidth, self.imheight = self.__image.size  # public for outer classes
        if self.imwidth * self.imheight > self.__huge_size * self.__huge_size and \
           self.__image.tile[0][0] == 'raw':  # only raw images could be tiled
            self.__huge = True  # image is huge
            self.__offset = self.__image.tile[0][2]  # initial tile offset
            self.__tile = [self.__image.tile[0][0],  # it have to be 'raw'
                           [0, 0, self.imwidth, 0],  # tile extent (a rectangle)
                           self.__offset,
                           self.__image.tile[0][3]]  # list of arguments to the decoder
        self.__min_side = min(self.imwidth, self.imheight)  # get the smaller image side
        # Create image pyramid
        self.__pyramid = [self.smaller()] if self.__huge else [Image.open(self.path)]
        # Set ratio coefficient for image pyramid
        self.__ratio = max(self.imwidth, self.imheight) / self.__huge_size if self.__huge else 1.0
        self.__curr_img = 0  # current image from the pyramid
        self.__scale = self.imscale * self.__ratio  # image pyramide scale
        self.__reduction = 2  # reduction degree of image pyramid
        w, h = self.__pyramid[-1].size
        while w > 512 and h > 512:  # top pyramid image is around 512 pixels in size
            w /= self.__reduction  # divide on reduction degree
            h /= self.__reduction  # divide on reduction degree
            self.__pyramid.append(self.__pyramid[-1].resize((int(w), int(h)), self.__filter))
        # Put image into container rectangle and use it to set proper coordinates to the image
        self.container = self.canvas.create_rectangle((0, 0, self.imwidth, self.imheight), width=0)
        self.__show_image()  # show image on the canvas
        self.canvas.focus_set()  # set focus on the canvas

    def smaller(self):
        """ Resize image proportionally and return smaller image """
        w1, h1 = float(self.imwidth), float(self.imheight)
        w2, h2 = float(self.__huge_size), float(self.__huge_size)
        aspect_ratio1 = w1 / h1
        aspect_ratio2 = w2 / h2  # it equals to 1.0
        if aspect_ratio1 == aspect_ratio2:
            image = Image.new('RGB', (int(w2), int(h2)))
            k = h2 / h1  # compression ratio
            w = int(w2)  # band length
        Elif aspect_ratio1 > aspect_ratio2:
            image = Image.new('RGB', (int(w2), int(w2 / aspect_ratio1)))
            k = h2 / w1  # compression ratio
            w = int(w2)  # band length
        else:  # aspect_ratio1 < aspect_ration2
            image = Image.new('RGB', (int(h2 * aspect_ratio1), int(h2)))
            k = h2 / h1  # compression ratio
            w = int(h2 * aspect_ratio1)  # band length
        i, j, n = 0, 1, round(0.5 + self.imheight / self.__band_width)
        while i < self.imheight:
            print('\rOpening image: {j} from {n}'.format(j=j, n=n), end='')
            band = min(self.__band_width, self.imheight - i)  # width of the tile band
            self.__tile[1][3] = band  # set band width
            self.__tile[2] = self.__offset + self.imwidth * i * 3  # tile offset (3 bytes per pixel)
            self.__image.close()
            self.__image = Image.open(self.path)  # reopen / reset image
            self.__image.size = (self.imwidth, band)  # set size of the tile band
            self.__image.tile = [self.__tile]  # set tile
            cropped = self.__image.crop((0, 0, self.imwidth, band))  # crop tile band
            image.paste(cropped.resize((w, int(band * k)+1), self.__filter), (0, int(i * k)))
            i += band
            j += 1
        print('\r' + 30*' ' + '\r', end='')  # hide printed string
        return image

    def redraw_figures(self):
        """ Dummy function to redraw figures in the children classes """
        pass

    def grid(self, **kw):
        """ Put CanvasImage widget on the parent widget """
        self.__imframe.grid(**kw)  # place CanvasImage widget on the grid
        self.__imframe.grid(sticky='nswe')  # make frame container sticky
        self.__imframe.rowconfigure(0, weight=1)  # make canvas expandable
        self.__imframe.columnconfigure(0, weight=1)

    def pack(self, **kw):
        """ Exception: cannot use pack with this widget """
        raise Exception('Cannot use pack with the widget ' + self.__class__.__name__)

    def place(self, **kw):
        """ Exception: cannot use place with this widget """
        raise Exception('Cannot use place with the widget ' + self.__class__.__name__)

    # noinspection PyUnusedLocal
    def __scroll_x(self, *args, **kwargs):
        """ Scroll canvas horizontally and redraw the image """
        self.canvas.xview(*args)  # scroll horizontally
        self.__show_image()  # redraw the image

    # noinspection PyUnusedLocal
    def __scroll_y(self, *args, **kwargs):
        """ Scroll canvas vertically and redraw the image """
        self.canvas.yview(*args)  # scroll vertically
        self.__show_image()  # redraw the image

    def __show_image(self):
        """ Show image on the Canvas. Implements correct image zoom almost like in Google Maps """
        box_image = self.canvas.coords(self.container)  # get image area
        box_canvas = (self.canvas.canvasx(0),  # get visible area of the canvas
                      self.canvas.canvasy(0),
                      self.canvas.canvasx(self.canvas.winfo_width()),
                      self.canvas.canvasy(self.canvas.winfo_height()))
        box_img_int = Tuple(map(int, box_image))  # convert to integer or it will not work properly
        # Get scroll region box
        box_scroll = [min(box_img_int[0], box_canvas[0]), min(box_img_int[1], box_canvas[1]),
                      max(box_img_int[2], box_canvas[2]), max(box_img_int[3], box_canvas[3])]
        # Horizontal part of the image is in the visible area
        if  box_scroll[0] == box_canvas[0] and box_scroll[2] == box_canvas[2]:
            box_scroll[0]  = box_img_int[0]
            box_scroll[2]  = box_img_int[2]
        # Vertical part of the image is in the visible area
        if  box_scroll[1] == box_canvas[1] and box_scroll[3] == box_canvas[3]:
            box_scroll[1]  = box_img_int[1]
            box_scroll[3]  = box_img_int[3]
        # Convert scroll region to Tuple and to integer
        self.canvas.configure(scrollregion=Tuple(map(int, box_scroll)))  # set scroll region
        x1 = max(box_canvas[0] - box_image[0], 0)  # get coordinates (x1,y1,x2,y2) of the image tile
        y1 = max(box_canvas[1] - box_image[1], 0)
        x2 = min(box_canvas[2], box_image[2]) - box_image[0]
        y2 = min(box_canvas[3], box_image[3]) - box_image[1]
        if int(x2 - x1) > 0 and int(y2 - y1) > 0:  # show image if it in the visible area
            if self.__huge and self.__curr_img < 0:  # show huge image
                h = int((y2 - y1) / self.imscale)  # height of the tile band
                self.__tile[1][3] = h  # set the tile band height
                self.__tile[2] = self.__offset + self.imwidth * int(y1 / self.imscale) * 3
                self.__image.close()
                self.__image = Image.open(self.path)  # reopen / reset image
                self.__image.size = (self.imwidth, h)  # set size of the tile band
                self.__image.tile = [self.__tile]
                image = self.__image.crop((int(x1 / self.imscale), 0, int(x2 / self.imscale), h))
            else:  # show normal image
                image = self.__pyramid[max(0, self.__curr_img)].crop(  # crop current img from pyramid
                                    (int(x1 / self.__scale), int(y1 / self.__scale),
                                     int(x2 / self.__scale), int(y2 / self.__scale)))
            #
            imagetk = ImageTk.PhotoImage(image.resize((int(x2 - x1), int(y2 - y1)), self.__filter))
            imageid = self.canvas.create_image(max(box_canvas[0], box_img_int[0]),
                                               max(box_canvas[1], box_img_int[1]),
                                               anchor='nw', image=imagetk)
            self.canvas.lower(imageid)  # set image into background
            self.canvas.imagetk = imagetk  # keep an extra reference to prevent garbage-collection

    def __move_from(self, event):
        """ Remember previous coordinates for scrolling with the mouse """
        self.canvas.scan_mark(event.x, event.y)

    def __move_to(self, event):
        """ Drag (move) canvas to the new position """
        self.canvas.scan_dragto(event.x, event.y, gain=1)
        self.__show_image()  # zoom tile and show it on the canvas

    def outside(self, x, y):
        """ Checks if the point (x,y) is outside the image area """
        bbox = self.canvas.coords(self.container)  # get image area
        if bbox[0] < x < bbox[2] and bbox[1] < y < bbox[3]:
            return False  # point (x,y) is inside the image area
        else:
            return True  # point (x,y) is outside the image area

    def __wheel(self, event):
        """ Zoom with mouse wheel """
        x = self.canvas.canvasx(event.x)  # get coordinates of the event on the canvas
        y = self.canvas.canvasy(event.y)
        if self.outside(x, y): return  # zoom only inside image area
        scale = 1.0
        # Respond to Linux (event.num) or Windows (event.delta) wheel event
        if event.num == 5 or event.delta == -120:  # scroll down, smaller
            if round(self.__min_side * self.imscale) < 30: return  # image is less than 30 pixels
            self.imscale /= self.__delta
            scale        /= self.__delta
        if event.num == 4 or event.delta == 120:  # scroll up, bigger
            i = min(self.canvas.winfo_width(), self.canvas.winfo_height()) >> 1
            if i < self.imscale: return  # 1 pixel is bigger than the visible area
            self.imscale *= self.__delta
            scale        *= self.__delta
        # Take appropriate image from the pyramid
        k = self.imscale * self.__ratio  # temporary coefficient
        self.__curr_img = min((-1) * int(math.log(k, self.__reduction)), len(self.__pyramid) - 1)
        self.__scale = k * math.pow(self.__reduction, max(0, self.__curr_img))
        #
        self.canvas.scale('all', x, y, scale, scale)  # rescale all objects
        # Redraw some figures before showing image on the screen
        self.redraw_figures()  # method for child classes
        self.__show_image()

    def __keystroke(self, event):
        """ Scrolling with the keyboard.
            Independent from the language of the keyboard, CapsLock, <Ctrl>+<key>, etc. """
        if event.state - self.__previous_state == 4:  # means that the Control key is pressed
            pass  # do nothing if Control key is pressed
        else:
            self.__previous_state = event.state  # remember the last keystroke state
            # Up, Down, Left, Right keystrokes
            if event.keycode in [68, 39, 102]:  # scroll right, keys 'd' or 'Right'
                self.__scroll_x('scroll',  1, 'unit', event=event)
            Elif event.keycode in [65, 37, 100]:  # scroll left, keys 'a' or 'Left'
                self.__scroll_x('scroll', -1, 'unit', event=event)
            Elif event.keycode in [87, 38, 104]:  # scroll up, keys 'w' or 'Up'
                self.__scroll_y('scroll', -1, 'unit', event=event)
            Elif event.keycode in [83, 40, 98]:  # scroll down, keys 's' or 'Down'
                self.__scroll_y('scroll',  1, 'unit', event=event)

    def crop(self, bbox):
        """ Crop rectangle from the image and return it """
        if self.__huge:  # image is huge and not totally in RAM
            band = bbox[3] - bbox[1]  # width of the tile band
            self.__tile[1][3] = band  # set the tile height
            self.__tile[2] = self.__offset + self.imwidth * bbox[1] * 3  # set offset of the band
            self.__image.close()
            self.__image = Image.open(self.path)  # reopen / reset image
            self.__image.size = (self.imwidth, band)  # set size of the tile band
            self.__image.tile = [self.__tile]
            return self.__image.crop((bbox[0], 0, bbox[2], band))
        else:  # image is totally in RAM
            return self.__pyramid[0].crop(bbox)

    def destroy(self):
        """ ImageFrame destructor """
        self.__image.close()
        map(lambda i: i.close, self.__pyramid)  # close all pyramid images
        del self.__pyramid[:]  # delete pyramid list
        del self.__pyramid  # delete pyramid variable
        self.canvas.destroy()
        self.__imframe.destroy()

class MainWindow(ttk.Frame):
    """ Main window class """
    def __init__(self, mainframe, path):
        """ Initialize the main Frame """
        ttk.Frame.__init__(self, master=mainframe)
        self.master.title('Advanced Zoom v3.0')
        self.master.geometry('800x600')  # size of the main window
        self.master.rowconfigure(0, weight=1)  # make the CanvasImage widget expandable
        self.master.columnconfigure(0, weight=1)
        canvas = CanvasImage(self.master, path)  # create widget
        canvas.grid(row=0, column=0)  # show widget

filename = './data/img_plg5.png'  # place path to your image here
#filename = 'd:/Data/yandex_z18_1-1.tif'  # huge TIFF file 1.4 GB
#filename = 'd:/Data/The_Garden_of_Earthly_Delights_by_Bosch_High_Resolution.jpg'
#filename = 'd:/Data/The_Garden_of_Earthly_Delights_by_Bosch_High_Resolution.tif'
#filename = 'd:/Data/heic1502a.tif'
#filename = 'd:/Data/land_shallow_topo_east.tif'
#filename = 'd:/Data/X1D5_B0002594.3FR'
app = MainWindow(tk.Tk(), path=filename)
app.mainloop()

追伸以下は、高度なズームを使用したGitHubアプリケーション ポリゴンを使用した手動画像注釈 です。

19
FooBar167

この場合は、マップタイルの使用を検討してください。タイルは、ズームレベルに固有にすることができます。パンとズームレベルに基づいてタイルを選択した後、Canvas.create_image

座標と画像を含むタイルクラスがあるとすると、パン、ズーム、フレームサイズに基づいて、表示されるタイルを選択できます。

for tile in visible_tiles(pan_center, frame_dimensions, zoom_level):
    canvas.create_image(tile.x, tile.y, anchor=Tkinter.NW, image=tile.image)

この完全なサンプルは、タイルマッピングクライアントの章のJohn SampleとElias Ioupによる タイルベースの地理空間情報システム にあります。

1
user650881

ズーム(ホイール付き)および移動/パン(左ボタンドラッグ付き)をサポートする基本的なメカニズムは次のとおりです。

from tkinter import ALL, EventType

canvas.bind("<MouseWheel>", do_zoom)
canvas.bind('<ButtonPress-1>', lambda event: canvas.scan_mark(event.x, event.y))
canvas.bind("<B1-Motion>", lambda event: canvas.scan_dragto(event.x, event.y, gain=1))

def do_zoom(event):
    factor = 1.001 ** event.delta
    canvas.scale(ALL, event.x, event.y, factor, factor)

シンプルな拡張:次のように、CtrlとShiftの状態を確認することにより、各軸のズームを個別にサポートします。

def do_zoom(event):
    factor = 1.001 ** event.delta
    is_shift = event.state & (1 << 0) != 0
    is_ctrl = event.state & (1 << 2) != 0
    canvas.scale(ALL, event.x, event.y, 
                 factor if not is_shift else 1.0, 
                 factor if not is_ctrl else 1.0)
1
Zach-M