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winstonwolff
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## Summary
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* *author: Mathieu Virbel*
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* *kivy: >= 1.3.0*
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On Retina screen (iOS / iPad 3), the resolution is high (> 2000px) with an high DPI. Kivy currently don't support DPI, and then, all the text will look very tiny etc.
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We don't have anything for properly handling DPI and the moment, so you could use that Scaler class. You might do some change in order to use it.
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## Usage
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## Summary
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* *author: Mathieu Virbel*
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* *kivy: >= 1.3.0*
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On Retina screen (iOS / iPad 3), the resolution is high (> 2000px) with an high DPI. Kivy currently don't support DPI, and then, all the text will look very tiny etc.
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We don't have anything for properly handling DPI and the moment, so you could use that Scaler class. You might do some change in order to use it.
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## Usage
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```
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#!python
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# Put in your App.build() method
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from kivy.utils import platform
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from scaler import Scaler
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class MyApp(App):
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def build(self):
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# construct your app here
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self.root = MyRootWidget()
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# special case for retina display, high dpi is not well handled
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# in kivy. use scatter to "zoom in"
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from kivy.core.window import Window
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self._scaler = None
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if platform() == 'ios' and (
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Window.width > 2000 or Window.height > 2000):
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self._scaler = Scaler(
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size=Window.size, scale=2)
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Window.add_widget(self._scaler)
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# add the widget to Window or scaler
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parent = self._scaler or Window
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parent.add_widget(self.root)
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```
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## Files
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#### scaler.py
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#!python
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# Put in your App.build() method
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from kivy.utils import platform
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from scaler import Scaler
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class MyApp(App):
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def build(self):
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# construct your app here
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self.root = MyRootWidget()
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# special case for retina display, high dpi is not well handled
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# in kivy. use scatter to "zoom in"
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from kivy.core.window import Window
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self._scaler = None
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if platform() == 'ios' and (
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Window.width > 2000 or Window.height > 2000):
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self._scaler = Scaler(
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size=Window.size, scale=2)
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Window.add_widget(self._scaler)
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# add the widget to Window or scaler
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parent = self._scaler or Window
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parent.add_widget(self.root)
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```
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#!python
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from kivy.uix.widget import Widget
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from kivy.properties import NumericProperty, ObjectProperty
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from kivy.base import EventLoop
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from kivy.lang import Builder
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class Scaler(Widget):
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scale = NumericProperty(2)
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container = ObjectProperty(None)
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def __init__(self, **kwargs):
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from kivy.base import EventLoop
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from kivy.lang import Builder
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Builder.load_string('''
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<Scaler>:
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container: container
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canvas.before:
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PushMatrix
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Scale:
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scale: root.scale
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canvas.after:
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PopMatrix
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FloatLayout:
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id: container
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size: root.width / root.scale, root.height / root.scale
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''')
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super(Scaler, self).__init__(**kwargs)
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EventLoop.add_postproc_module(self)
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def get_parent_window(self):
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return self.container
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def add_widget(self, widget):
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if self.container is not None:
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return self.container.add_widget(widget)
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return super(Scaler, self).add_widget(widget)
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def remove_widget(self, widget):
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if self.container is not None:
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return self.container.remove_widget(widget)
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return super(Scaler, self).remove_widget(widget)
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def process_to_local(self, x, y, relative=False):
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if x is None:
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return None, None
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s = float(self.scale)
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return x / s, y / s
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def process(self, events):
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transform = self.process_to_local
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transformed = []
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for etype, event in events:
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# you might have a move and up event in the same process
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# then avoid the double-transformation
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if event in transformed:
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continue
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transformed.append(event)
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event.sx, event.sy = transform(event.sx, event.sy)
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if etype == 'begin':
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event.osx, event.osy = transform(event.osx, event.osy)
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else:
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# update the delta
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event.dsx = event.sx - event.psx
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event.dsy = event.sy - event.psy
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return events
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```
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##Comments
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Add your comments here ...
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## Files
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#### scaler.py
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```
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#!python
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from kivy.uix.widget import Widget
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from kivy.properties import NumericProperty, ObjectProperty
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from kivy.base import EventLoop
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from kivy.lang import Builder
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class Scaler(Widget):
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scale = NumericProperty(2)
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container = ObjectProperty(None)
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def __init__(self, **kwargs):
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from kivy.base import EventLoop
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from kivy.lang import Builder
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Builder.load_string('''
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<Scaler>:
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container: container
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canvas.before:
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PushMatrix
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Scale:
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scale: root.scale
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canvas.after:
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PopMatrix
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FloatLayout:
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id: container
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size: root.width / root.scale, root.height / root.scale
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''')
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super(Scaler, self).__init__(**kwargs)
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EventLoop.add_postproc_module(self)
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def get_parent_window(self):
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return self.container
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def add_widget(self, widget):
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if self.container is not None:
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return self.container.add_widget(widget)
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return super(Scaler, self).add_widget(widget)
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def remove_widget(self, widget):
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if self.container is not None:
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return self.container.remove_widget(widget)
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return super(Scaler, self).remove_widget(widget)
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def process_to_local(self, x, y, relative=False):
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if x is None:
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return None, None
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s = float(self.scale)
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return x / s, y / s
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def process(self, events):
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transform = self.process_to_local
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transformed = []
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for etype, event in events:
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# you might have a move and up event in the same process
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# then avoid the double-transformation
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if event in transformed:
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continue
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transformed.append(event)
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event.sx, event.sy = transform(event.sx, event.sy)
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if etype == 'begin':
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event.osx, event.osy = transform(event.osx, event.osy)
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else:
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# update the delta
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event.dsx = event.sx - event.psx
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event.dsy = event.sy - event.psy
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return events
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```
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##Comments
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Add your comments here ...
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Is this relevant anymore now that kivy includes kivy.metrics? - Winston Oct 2013
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