describe keyboard controls

README.md

@@ -10,7 +10,7 @@ pip install pyglet-cornerpin
 
 ## Usage
 
-Create instance for a window, and register the event handlers for dragging the pins.
+Create instance for a window, and register the event handlers for dragging the pins. A `on_key_release` is also registered to handle keyboard controls to move the pins.
 
 
 ```python
@@ -46,3 +46,5 @@ pins = PygletCornerPin(window, corners)
 ```
 
 Run [pattern.py](examples/pattern.py) in the examples folder for a demo.
+
+To use the keyboard, select a pin with number keys 1-4, the use the arrow keys (optionally with ctrl/shift modifier) to move the handle.

examples/pattern.py

@@ -1,5 +1,5 @@
 import pyglet
-from pyglet_corner_pin import PygletCornerPin
+from pyglet_cornerpin import PygletCornerPin
 
 window = pyglet.window.Window()
 

pyglet_cornerpin/cornerpin.py

@@ -96,6 +96,7 @@ class PygletCornerPin(pyglet.event.EventDispatcher):
        self.handles = [
           pyglet.shapes.Arc(c[0],c[1],20, thickness=2, color=(0,0,255,255), batch=self.batch) for c in self.corners
        ]
+       self.current_corner = None
     
     def update_handles(self):
        for i, c in enumerate(self.corners):
@@ -149,6 +150,51 @@ class PygletCornerPin(pyglet.event.EventDispatcher):
         self.corners[self.dragging][1] = y
         self.update_view()
 
+    def on_key_release(self, symbol: int, modifiers: int):
+      if symbol not in [
+         pyglet.window.key._1, pyglet.window.key._2, pyglet.window.key._3, pyglet.window.key._4,
+         pyglet.window.key.ESCAPE,
+         pyglet.window.key.UP, pyglet.window.key.DOWN, pyglet.window.key.LEFT, pyglet.window.key.RIGHT,
+        ]:
+         return pyglet.event.EVENT_UNHANDLED
+      
+      if symbol == pyglet.window.key._1:
+        self.current_corner = 2
+      if symbol == pyglet.window.key._2:
+        self.current_corner = 3
+      if symbol == pyglet.window.key._3:
+        self.current_corner = 0
+      if symbol == pyglet.window.key._4:
+        self.current_corner = 1
+      if symbol == pyglet.window.key.ESCAPE:
+        self.current_corner = None
+
+      for i, h in enumerate(self.handles):
+        h.color = (255,0,0,255) if i == self.current_corner else (0,0,255,255)
+      
+      if self.current_corner is None:
+        return
+      
+        
+      if symbol not in [pyglet.window.key.UP,pyglet.window.key.DOWN, pyglet.window.key.LEFT, pyglet.window.key.RIGHT]:
+         return
+      
+      base = 2
+      if modifiers & pyglet.window.key.MOD_SHIFT:
+         base += 10
+      if modifiers & pyglet.window.key.MOD_CTRL:
+         base *= 2
+      
+      if symbol == pyglet.window.key.RIGHT:
+        self.corners[self.current_corner][0] += base
+      if symbol == pyglet.window.key.LEFT:
+        self.corners[self.current_corner][0] -= base
+      if symbol == pyglet.window.key.UP:
+        self.corners[self.current_corner][1] += base
+      if symbol == pyglet.window.key.DOWN:
+        self.corners[self.current_corner][1] -= base
+         
+      self.update_view()
     
     def update_view(self):
        self.window.view = self.transform2d_matrix(*[x for c in self.corners for x in c])