compositionTarget.rendering:变化变量

Question

我目前正在使用CompositionTarget.Rendering为我的图形，我的弹丸模拟，但我不知道如何让我的加速度变化。它是否有可能喜欢它的一个变量，并被绑定到它，因为它的变化，所以加速度？

谢谢你的帮助。

到目前为止我的代码是：

    private Point position; // in pixels
    private Vector Velocity; // in pixels per second
    private Vector acceleration; // in pixels per square second

    Velocity = new Vector(HVelTemp, VVelTemp); // y direction is downwards
    acceleration = new Vector(0, -1 * newEnvironment.gravity * PixelPerMeter); // y direction is downwards
    private void OnLoaded(object sender, RoutedEventArgs e)
    {
        position = new Point(5, (HighestPoint * PixelPerMeter)); // fix later pls
        int removedtime = 0;
        time = DateTime.Now;
        RenderingEvent = (s, g) => OnRendering(s, g, removedtime, time);
        CompositionTarget.Rendering += RenderingEvent;
    }

    private void OnRendering(object sender, EventArgs g, int removedtime, DateTime t)
    {
        var now = DateTime.Now.AddSeconds(-removedtime);
        var dt = (now - t).TotalSeconds;
        time = now;
        position += Velocity * dt;
        Velocity += acceleration * dt;
        projectileGeometry.Center = position;
    }

Answer 1

您可以将Acceleration声明为依赖项属性。因此，它是可绑定的。下面的声明假设您的代码属于MainWindow类。

public static readonly DependencyProperty AccelerationProperty =
    DependencyProperty.Register(
        "Acceleration", typeof(Vector), typeof(MainWindow));

public Vector Acceleration
{
    get { return (Vector)GetValue(AccelerationProperty); }
    set { SetValue(AccelerationProperty, value); }
}

...
Velocity += Acceleration * dt;