/// <summary>
/// Updates the <see cref="IRefractionEffect"/>.
/// </summary>
/// <param name="currentTime">The current game time in milliseconds.</param>
public virtual void Update(TickCount currentTime)
{
if (IsExpired)
{
return;
}
_lastUpdateTime = currentTime;
// Get the life of the effect
var totalElapsedTime = (int)currentTime - _startTime;
if (totalElapsedTime < 0)
{
totalElapsedTime = 0;
}
// Check if expired
if (totalElapsedTime >= _lifeSpan)
{
Dispose();
return;
}
// Update the size
_size = ExpansionRate * totalElapsedTime;
// Update the sprite
ExplosionNoise.Update(currentTime);
}
/// <summary>
/// Draws the <see cref="IRefractionEffect"/>.
/// </summary>
/// <param name="spriteBatch">The <see cref="ISpriteBatch"/> to draw with.</param>
public virtual void Draw(ISpriteBatch spriteBatch)
{
if (IsExpired || !IsEnabled)
{
return;
}
// Update the effect's parameters
SetShaderParameters(_lastUpdateTime);
// Draw
var dest = ToRectangle();
var oldBlendMode = spriteBatch.BlendMode;
try
{
spriteBatch.BlendMode = BlendMode.Add;
try
{
Shader.Bind();
ExplosionNoise.Draw(spriteBatch, dest);
}
finally
{
Shader.Unbind();
}
}
finally
{
spriteBatch.BlendMode = oldBlendMode;
}
}
