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