/// <summary>
/// Invalidates the specified region of the canvas (adds it to the canvas's update region,
/// which is the area that will be repainted at the next paint operation), and causes a paint
/// message to be sent to the canvas.
/// </summary>
/// <param name="bounds">A rectangle object that represents the region to invalidate.</param>
public virtual void InvalidateBounds(RectangleF bounds)
{
PDebug.ProcessInvalidate();
if (regionManagement)
{
// Hack: Invalidate the bounds of the previously invalidated rectangle
// and the current rectangle, since invalidating lots of small rectangles
// causes a performance hit.
if (invalidatedBounds.IsEmpty)
{
invalidatedBounds = bounds;
}
else
{
invalidatedBounds = RectangleF.Union(invalidatedBounds, bounds);
}
RectangleF insetRect = new RectangleF(invalidatedBounds.X - 1, invalidatedBounds.Y - 1,
invalidatedBounds.Width + 2, invalidatedBounds.Height + 2);
int x = (int)Math.Floor(insetRect.X);
int y = (int)Math.Floor(insetRect.Y);
int width = (int)Math.Ceiling(insetRect.Right - x);
int height = (int)Math.Ceiling(insetRect.Bottom - y);
Invalidate(new Rectangle(x, y, width, height));
}
else
{
Invalidate();
}
}
/// <summary>
/// Invalidates the specified region of the canvas (adds it to the canvas's update region,
/// which is the area that will be repainted at the next paint operation), and causes a paint
/// message to be sent to the canvas.
/// </summary>
/// <param name="bounds">A rectangle object that represents the region to invalidate.</param>
public void InvalidateBounds(RectangleF bounds)
{
PDebug.ProcessInvalidate();
Rectangle insetRect = new Rectangle((int)Math.Floor(bounds.X) - 1, (int)Math.Floor(bounds.Y) - 1,
(int)Math.Ceiling(bounds.Width) + 2, (int)Math.Ceiling(bounds.Height) + 2);
Invalidate(insetRect);
}
