From b281d61fb5881eac7a7f437ada1ff4649e915276 Mon Sep 17 00:00:00 2001
From: Martin Putzlocher <m.putzlocher@stiftland-gymnasium.de>
Date: Tue, 19 Apr 2022 22:40:06 +0200
Subject: [PATCH] Kleine Erweiterung des Canvas-Beispiels

---
 tk_canvas/my_canvas.py | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/tk_canvas/my_canvas.py b/tk_canvas/my_canvas.py
index beaf153..d145946 100644
--- a/tk_canvas/my_canvas.py
+++ b/tk_canvas/my_canvas.py
@@ -13,7 +13,7 @@ class Controller(object):
         print("Run")
         self.app.main_canvas.bind('<1>', self.make_circle)
         self.app.main_canvas.bind('<3>', self.select_item)
-        self.app.main_canvas.bind('<SHIFT-1>', self.select_for_line)
+        self.app.main_canvas.bind('<Shift-1>', self.select_for_line)
         return 0
 
     def make_circle(self, event):
@@ -39,8 +39,19 @@ class Controller(object):
         self.app.main_canvas.coords("selected",x-r, y-r, x+r, y+r)
 
     def select_for_line(self, event):
-        pass
+        self.app.main_canvas.addtag_withtag("sel_line", tk.CURRENT)
+        start_coords = self.app.main_canvas.coords("sel_line")
+        self.x0 = (start_coords[0] + start_coords[2]) // 2
+        self.y0 = (start_coords[1] + start_coords[3]) // 2
+        x = event.x
+        y = event.y
+        self.app.main_canvas.create_line(self.x0,self.y0,x,y, tag="newline")
+        self.app.main_canvas.bind('<Motion>', self.move_line)
 
+    def move_line(self, event):
+        x = event.x
+        y = event.y
+        self.app.main_canvas.coords("newline",self.x0,self.y0,x,y)
 
 class Application(tk.Tk):
     def __init__(self):