IronPythonで、Snow ( Gastaltのサンプル ) を実行する！

再び WPF/IronPythonで、 Snow (Gestalt Particles Pack)サンプルを実行する。

Gestalt ⇒ samples ⇒ Particles Pack ⇒ view 1
http://www.visitmix.com/labs/gestalt/samples/
暑い夏に、清涼感を感じてください...

Let it grow, let it grow,
Let it blossom, let it flow.
In the sun, the rain, the snow,
Love is lovely, let it grow.

# 
# snow.py
# from: particles.simple.python.html
#
import clr
clr.AddReferenceByPartialName("PresentationFramework")
clr.AddReferenceByPartialName("PresentationCore")
clr.AddReference('WindowsBase') # for Point
from System.Windows.Markup import XamlReader
from System import Object, Random, Math
from System.Windows import Window, Application, Point
from System.Windows.Controls import Canvas, UserControl
from System.Windows.Media import CompositionTarget, Brushes
#from System.Windows.Media.Animation import Storyboard 
    
xaml_SnowFlake_str = """
<UserControl 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Width="20" Height="20">
    <Grid x:Name="LayoutRoot">
        <Ellipse Fill="#FFFFFFFF"></Ellipse>
    </Grid>
</UserControl>
"""
class Snowflake(UserControl):
    def __init__(self, xaml, randomNumber):
        self.xaml = xaml
        self.randomNumber = randomNumber
        self.x = 0
        self.y = 0
        self.xSpeed = 0
        self.ySpeed = 0
        self.radius = 0
        self.scale = 0
        self.alpha = 0
        self.stageSize = Point()
        self.Content = XamlReader.Parse(xaml)
            
        # This method gets called many times a second and is responsible for moving your snowflake around
        def MoveSnowFlake(sender, e):
            self.x = self.x + self.xSpeed
            self.y = self.y + self.ySpeed
    
            Canvas.SetTop(self, self.y)
            Canvas.SetLeft(self, Canvas.GetLeft(self) + self.radius * Math.Cos(self.x))
    
            # Reset the position to go back to the top when the bottom boundary is reached
            if (Canvas.GetTop(self) > self.stageSize.Y):
                Canvas.SetTop(self, - self.ActualHeight - 10)
                self.y = Canvas.GetTop(self)

        CompositionTarget.Rendering += MoveSnowFlake # !
                     
    def SetInitialProperties(self, stageWidth, stageHeight):
        self.xSpeed = self.randomNumber.NextDouble() / 20
        self.ySpeed = .01 + self.randomNumber.NextDouble() * 2
        self.radius = self.randomNumber.NextDouble()
        self.scale = .01 + self.randomNumber.NextDouble() * 2
        self.alpha = .1 + self.randomNumber.NextDouble()
    
        # Setting initial position
        Canvas.SetLeft(self, self.randomNumber.Next(stageWidth))
        Canvas.SetTop(self, self.randomNumber.Next(stageHeight))
    
        self.stageSize = Point(stageWidth, stageHeight)
        self.y = Canvas.GetTop(self)
    
        # Setting initial size and opacity
        self.Content.Width = 5 * self.scale
        self.Content.Height = 5 * self.scale
        self.Content.Opacity = self.alpha

class SnowWindow(Window):
    def __init__(self):
        self.Title="Let It Grow"
        self.Width = 600
        self.Height= 300
        self.Background = Brushes.Black
        xaml_str="""  
            <Canvas x:Name="LayoutRoot"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
              <Canvas.Background>
                <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                  <GradientStop Color="#FF00202A" Offset="1"></GradientStop>
                  <GradientStop Color="#FF000000" Offset="0"></GradientStop>
                </LinearGradientBrush>
              </Canvas.Background>
            </Canvas>"""
        canvas = XamlReader.Parse(xaml_str)
        self.layoutRoot = canvas.FindName("LayoutRoot")
        canvas.Width = 600
        canvas.Height = 300
        self.Content = canvas  

        randomNumber = Random()
        for i in range(0, 200):
            snowflake = Snowflake(xaml_SnowFlake_str, randomNumber)
            # 600 and 300 is the width/height of the application
            snowflake.SetInitialProperties(600, 300)
            self.layoutRoot.Children.Add(snowflake)

if __name__ == "__main__":
    win = SnowWindow()
    Application().Run(win)

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