How do I work with the geometry of Tkinter in Python? -


i've been having trouble wrapping head around geometry of tkinter. have range of questions hoping kind enough clear me.

when making rectangle in below code passed in 4 parameters. i'm aware they're x1, y1, x2, y2 parameter how work? can't seem create rectangle of specific size , place want. also, 20+20 thing mean in 3rd , fourth parameter exactly?

how detect specific coordinate? able detect line on screen , execute code based when rectangle touches i'm clueless. can't position line in position want either emphasize how little tkinter's geometry.

window = tk() window.geometry("400x200+450+300")  canvas1 = canvas(window, width = 600, height = 300, bg='white') canvas1.pack() canvas1.create_line(25, 50, 50, 50)  robot = canvas1.create_rectangle(10, 10, 20+20, 20+20)  x1, y1, x2, y2 = canvas1.coords(robot)  def right(event):     x1, y1, x2, y2 = canvas1.coords(robot)     canvas1.coords(robot, x1+10, y1, x2+10, y2)  def left(event):     x1, y1, x2, y2 = canvas1.coords(robot)     canvas1.coords(robot, x1-10, y1, x2-10, y2)  def up(event):     x1, y1, x2, y2 = canvas1.coords(robot)     canvas1.coords(robot, x1, y1-10, x2, y2-10)   def down(event):     x1, y1, x2, y2 = canvas1.coords(robot)     canvas1.coords(robot, x1, y1+10, x2, y2+10)    canvas1.focus_set() canvas1.bind("<right>", right) canvas1.bind("<left>", left) canvas1.bind("<up>", up) canvas1.bind("<down>", down)

thanks help.

tkinter canvas coordinates start 0,0 @ upper left corner of canvas. x gets bigger point moves right. y gets bigger point moves down.

consider line of code:

robot = canvas1.create_rectangle(10, 10, 20+20, 20+20)

this creates rectangle formed coordinates (10,10) , (40,40). starting upper left corner, tkinter count ten pixels on , ten pixels down draw first corner of rectangle. opposite corner of rectangle (40,22). (not scale):

  point 1 (10,10)     +                      +                  point 2 (40, 40)

tkinter create rectangle computing missing corners wich @ (40,10) , (10,22)

  point 1 (10,10)     +--------------+     |              |     |              |     +--------------+                  point 2 (40,40)

as second question (which should separate question), can determine if 1 object overlaps canvas find_overlapping method.


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