Ajout du GUI

kivy/modules/touchring.py

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+'''
+Touchring
+=========
+
+Shows rings around every touch on the surface / screen. You can use this module
+to check that you don't have any calibration issues with touches.
+
+Configuration
+-------------
+
+:Parameters:
+    `image`: str, defaults to '<kivy>/data/images/ring.png'
+        Filename of the image to use.
+    `scale`: float, defaults to 1.
+        Scale of the image.
+    `alpha`: float, defaults to 1.
+        Opacity of the image.
+
+Example
+-------
+
+In your configuration (`~/.kivy/config.ini`), you can add something like
+this::
+
+    [modules]
+    touchring = image=mypointer.png,scale=.3,alpha=.7
+
+'''
+
+__all__ = ('start', 'stop')
+
+from kivy.core.image import Image
+from kivy.graphics import Color, Rectangle
+from kivy import kivy_data_dir
+from os.path import join
+
+pointer_image = None
+pointer_scale = 1.0
+pointer_alpha = 0.7
+
+
+def _touch_down(win, touch):
+    ud = touch.ud
+    with win.canvas.after:
+        ud['tr.color'] = Color(1, 1, 1, pointer_alpha)
+        iw, ih = pointer_image.size
+        ud['tr.rect'] = Rectangle(
+            pos=(
+                touch.x - (pointer_image.width / 2. * pointer_scale),
+                touch.y - (pointer_image.height / 2. * pointer_scale)),
+            size=(iw * pointer_scale, ih * pointer_scale),
+            texture=pointer_image.texture)
+
+    if not ud.get('tr.grab', False):
+        ud['tr.grab'] = True
+        touch.grab(win)
+
+
+def _touch_move(win, touch):
+    ud = touch.ud
+    if not ud.get('tr.rect', False):
+        _touch_down(win, touch)
+    ud['tr.rect'].pos = (
+        touch.x - (pointer_image.width / 2. * pointer_scale),
+        touch.y - (pointer_image.height / 2. * pointer_scale))
+
+
+def _touch_up(win, touch):
+    if touch.grab_current is win:
+        ud = touch.ud
+        win.canvas.after.remove(ud['tr.color'])
+        win.canvas.after.remove(ud['tr.rect'])
+
+        if ud.get('tr.grab') is True:
+            touch.ungrab(win)
+            ud['tr.grab'] = False
+
+
+def start(win, ctx):
+    # XXX use ctx !
+    global pointer_image, pointer_scale, pointer_alpha
+
+    pointer_fn = ctx.config.get('image',
+                                'atlas://data/images/defaulttheme/ring')
+    pointer_scale = float(ctx.config.get('scale', 1.0))
+    pointer_alpha = float(ctx.config.get('alpha', 1.0))
+    pointer_image = Image(pointer_fn)
+
+    win.bind(on_touch_down=_touch_down,
+             on_touch_move=_touch_move,
+             on_touch_up=_touch_up)
+
+
+def stop(win, ctx):
+    win.unbind(on_touch_down=_touch_down,
+               on_touch_move=_touch_move,
+               on_touch_up=_touch_up)