CODEWITHSUNDEEP
pythonpython-2.7tkinter
user4772964
user4772964

Reputation:

Tkinter: getting coordinates of a mouse drawn rectangle

Working on the answer of my previous question, I wonder how to get the coordinates of the 4 pixels representing the corners of the rectangle as well as its 2 dimensions ?

Upvotes: 1

Views: 1761

Answers (2)

fhdrsdg
fhdrsdg

Reputation: 10602

You can use canvas.bbox(item) to get the coordinates of the bounding box of an item on the canvas. Because your item is a rectangle, the bounding box exactly represents the rectangle.
In your case it would be:

self.canvas.bbox(self.rect)

This returns a tuple containing (x0, y0, x1, y1) in which point 0 is the upper left corner and point 1 is the lower right corner.
You can easily convert these to the four corners and sizes:

Upper left  = x0, y0
Upper right = x1, y0
Lower left  = x0, y1
Lower right = x1, y1

width  = x1-x0
height = y1-y0

Upvotes: 1

Craig Burgler
Craig Burgler

Reputation: 1779

Just use the x,y coordinates contained in the event parameter of the on_button_press() and on_button_release() methods:

width = abs(xRelease - xPress)
height = abs(yRelease - yPress)

Upvotes: 0

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