private void SetYAnimations(Ellipse g, int offset, LengthAnimationCollection centerYAnimCopy, LengthAnimationCollection centerXAnimCopy, int fallRate, Boolean isShadow)
{
LengthAnimation anim = centerXAnimCopy[0] as LengthAnimation;
anim.By = new Length(windowWidth - 2 * largestRadius);
anim.Duration = xAnimDuration;
// The following 3 animations simulate a bouncing motion.
anim = centerYAnimCopy[0] as LengthAnimation;
anim.By = new Length((isShadow ? 1 : -1) * windowHeight - largestRadius);
anim = centerYAnimCopy[1] as LengthAnimation;
anim.To = g.CenterY;
anim = centerYAnimCopy[2] as LengthAnimation;
anim.To = g.CenterY;
// Animation that causes general motion in the Y direction.
anim = centerYAnimCopy[3] as LengthAnimation;
anim.By = new Length(-windowHeight * 2 / 3);
Double lastValue = anim.By.Value;
// Animation that perturbs motion a bit in Y direction to keep it from being regular.
anim = centerYAnimCopy[4] as LengthAnimation;
anim.By = new Length(lastValue / 10.0);
// Animation that makes the balls fall off the screen at different rates. Later balls fall at a later time that earlier balls.
anim = centerYAnimCopy[5] as LengthAnimation;
anim.Begin = new TimeSyncValue(bounceDuration + new Time(1000 + offset * 100));
anim.By = new Length(windowHeight * fallRate / 100.0);
anim.RepeatCount = 1;
}
// note: the hard-coded numbers within the code were chosen for visual and optimization reasons.
private void Start(object sender, System.EventArgs e)
{
// Get size of window
NavigationApplication NavApp = MSAvalon.Windows.Application.Current as NavigationApplication;
NavigationWindow NavWin;
NavWin = NavApp.Windows[0] as NavigationWindow;
windowWidth = Convert.ToInt32(NavWin.Width.Value);
windowHeight = Convert.ToInt32(NavWin.Height.Value);
InitColors();
rng = new Random();
// Set time for balls to move across screen/explode
xAnimDuration = new Time(4000);
bounceDuration = new Time(25200);
// Grab the resources from the XAML file.
LengthAnimationCollection centerXAnim = rootCanvas.FindResource("myCenterXAnim") as LengthAnimationCollection;
LengthAnimationCollection centerYAnim = rootCanvas.FindResource("myCenterYAnim") as LengthAnimationCollection;
LengthAnimationCollection radiusAnim = rootCanvas.FindResource("myRadiusAnim") as LengthAnimationCollection;
// Create a master timeline that drives the ball animations.
timeline = new Timeline();
timeline.Begin = new Time(1000); // Pause to allow window to load
timeline.Duration = bounceDuration + new Time(3000); // Added pause after balls fall off screen
timeline.Repeated += (new EventHandler(OnRepeated));
timeline.RepeatDuration = Time.Indefinite;
// Create a number of balls with animations.
balls = new Ellipse[maxBalls];
shadows = new Ellipse[maxBalls];
numBalls = rng.Next(minBalls, maxBalls);
for (int i = 0; i < balls.Length; i++)
{
balls[i] = CreateGlobe(i, false);
shadows[i] = CreateGlobe(i, true);
// For bursting/falling:
int randomGrowth = rng.Next(8, 13); // Growth rate will be between +8 and +13
int fallRate = rng.Next(150, 200); // Fall rate will between 150% and 200%
SetGlobeAnimations(balls[i], i, randomGrowth, fallRate, centerXAnim.Copy(), centerYAnim.Copy(), radiusAnim.Copy(), false);
SetGlobeAnimations(shadows[i], i, randomGrowth, fallRate, centerXAnim.Copy(), centerYAnim.Copy(), radiusAnim.Copy(), true);
// Add the ball to the canvas and to our ball collection.
if (i < numBalls)
{
rootCanvas.Children.Add(balls[i]);
rootCanvas.Children.Add(shadows[i]);
}
}
int randomColorMethod = rng.Next(0, 100); // Used to choose how to generate random colors.
int randomColorOffset = rng.Next(0, 4); // Used to choose base color for sequenced colors.
// Assign colors to the balls
ColorGlobes(balls, randomColorOffset, randomColorMethod, false);
ColorGlobes(shadows, randomColorOffset, randomColorMethod, true);
}
private void SetDelayedStart(LengthAnimationCollection centerAnimCopy, int offset)
{
foreach (LengthAnimation la in centerAnimCopy)
{
int delta = 75 * offset;
la.Begin = new TimeSyncValue(delta);
la.RepeatDuration = bounceDuration - new Time(delta);
}
}
private void SetGlobeAnimations(Ellipse g, int offset, int randomGrowth, int fallRate, LengthAnimationCollection centerXAnimCopy, LengthAnimationCollection centerYAnimCopy, LengthAnimationCollection radiusAnimCopy, Boolean isShadow)
{
// Set the animations so that they start staggered in time.
SetDelayedStart(centerXAnimCopy, offset);
SetDelayedStart(centerYAnimCopy, offset);
foreach (LengthAnimation laR in radiusAnimCopy)
{
laR.Begin = new TimeSyncValue(bounceDuration + new Time(10 * offset));
laR.By = new Length(laR.By.Value * randomGrowth / 10.0); // Have each ball explode to a random size.
}
SetYAnimations(g, offset, centerYAnimCopy, centerXAnimCopy, fallRate, isShadow);
// Bind the animations to the ball's center position.
g.SetAnimations(Ellipse.CenterXProperty, centerXAnimCopy);
g.SetAnimations(Ellipse.CenterYProperty, centerYAnimCopy);
g.SetAnimations(Ellipse.RadiusXProperty, radiusAnimCopy);
g.SetAnimations(Ellipse.RadiusYProperty, radiusAnimCopy);
}