public void Round()
{
Assert.AreEqual(rectI, rectD.Round());
Assert.AreEqual(rectI, new RectD(0.6, 1.6, 3.6, 4.6).Round());
Assert.AreEqual(rectI, new RectD(1.4, 2.4, 4.4, 5.4).Round());
Assert.AreEqual(rectI, rectF.Round());
Assert.AreEqual(rectI, new RectF(0.6f, 1.6f, 3.6f, 4.6f).Round());
Assert.AreEqual(rectI, new RectF(1.4f, 2.4f, 4.4f, 5.4f).Round());
}
/// <summary>
/// Draws an image frame that is centered within the specified <see cref="RectD"/>.
/// </summary>
/// <param name="targetBitmap">
/// The <see cref="WriteableBitmap"/> for the drawing, assuming that <paramref
/// name="targetContext"/> is a null reference.</param>
/// <param name="targetContext">
/// The <see cref="DrawingContext"/> for the drawing, assuming that <paramref
/// name="targetBitmap"/> is a null reference.</param>
/// <param name="target">
/// The region within <paramref name="targetContext"/> on which the copied image frame is
/// centered.</param>
/// <param name="sourceBitmap">
/// A <see cref="WriteableBitmap"/> containing the image frame to copy.</param>
/// <param name="source">
/// The region within <paramref name="sourceBitmap"/> that covers the image frame to copy.
/// </param>
/// <param name="scalingX">
/// An <see cref="ImageScaling"/> value indicating the horizontal scaling of the <paramref
/// name="source"/> region to fit the specified <paramref name="target"/> region.</param>
/// <param name="scalingY">
/// An <see cref="ImageScaling"/> value indicating the vertical scaling of the <paramref
/// name="source"/> region to fit the specified <paramref name="target"/> region.</param>
/// <param name="colorShift">
/// An optional <see cref="ColorVector"/> applied to all pixels within the drawing. Specify
/// <see cref="ColorVector.Empty"/> if colors should remain unchanged.</param>
/// <param name="offset">
/// An optional pixel offset that is added to the centered location within the <paramref
/// name="target"/> region.</param>
/// <param name="scalingVector">
/// An optional scaling vector for the drawing. Specify <see cref="PointI.Empty"/> if no
/// scaling vector should be applied.</param>
/// <exception cref="ArgumentException">
/// <paramref name="targetBitmap"/> and <paramref name="targetContext"/> are both valid or
/// both null references.</exception>
/// <exception cref="ArgumentNullException">
/// <paramref name="sourceBitmap"/> is a null reference.</exception>
/// <remarks><para>
/// <b>DrawFrame</b> expects that the specified <paramref name="target"/> region equals the
/// <see cref="RegularPolygon.Bounds"/> of the desired <see cref="RegularPolygon"/> shape.
/// <b>DrawFrame</b> does not apply a mask or draw an outline around the frame.
/// </para><para>
/// Either the specified <paramref name="targetBitmap"/> or the specified <paramref
/// name="targetContext"/> must be valid, but not both. <b>DrawFrame</b> internally draws to
/// a <see cref="WriteableBitmap"/> whenever possible to preserve visual quality, then
/// copies the result to the specified drawing target if different. Alpha blending is
/// performed only when drawing to a valid <paramref name="targetContext"/>.
/// </para><para>
/// If <paramref name="targetBitmap"/> is valid, it must be locked before <b>DrawFrame</b>
/// is called. If <paramref name="targetContext"/> is valid, the specified <paramref
/// name="scalingVector"/> is applied to its transformation matrix; otherwise, negative
/// components indicate mirroring along the corresponding axis of the <paramref
/// name="targetBitmap"/>.</para></remarks>
internal static void DrawFrame(WriteableBitmap targetBitmap,
DrawingContext targetContext, RectD target,
WriteableBitmap sourceBitmap, RectI source,
ImageScaling scalingX, ImageScaling scalingY,
ColorVector colorShift, PointI offset, PointI scalingVector)
{
// exactly one drawing target must be valid
if ((targetContext == null && targetBitmap == null) ||
(targetContext != null && targetBitmap != null))
{
ThrowHelper.ThrowArgumentExceptionWithFormat(
"targetBitmap", Tektosyne.Strings.ArgumentConflict, targetContext);
}
if (sourceBitmap == null)
{
ThrowHelper.ThrowArgumentNullException("sourceBitmap");
}
// copy source tile to buffer bitmap
var frameBitmap = new WriteableBitmap(
source.Width, source.Height, 96, 96, PixelFormats.Pbgra32, null);
frameBitmap.Lock();
frameBitmap.Read(0, 0, sourceBitmap, source);
// shift color channels if desired
if (!colorShift.IsEmpty)
{
frameBitmap.Shift(colorShift.R, colorShift.G, colorShift.B);
}
frameBitmap.Unlock();
// round target coordinates for bitmaps
RectI targetI = target.Round();
// use WPF drawing for Stretch scaling, else bitmap copying
if (scalingX == ImageScaling.Stretch || scalingY == ImageScaling.Stretch)
{
// create intermediate context if necessary
DrawingVisual visual = null;
if (targetContext == null)
{
visual = new DrawingVisual();
targetContext = visual.RenderOpen();
}
// draw frame to target or intermediate context
DrawFrameCore(targetContext, target, frameBitmap,
scalingX, scalingY, offset, scalingVector);
// copy intermediate context to target bitmap
if (visual != null)
{
targetContext.Close();
var bitmap = new RenderTargetBitmap(
targetI.Right, targetI.Bottom, 96, 96, PixelFormats.Pbgra32);
bitmap.Render(visual);
targetBitmap.Read(targetI.X, targetI.Y, bitmap, targetI);
}
}
else
{
// create intermediate bitmap if necessary
if (targetContext != null)
{
Debug.Assert(targetBitmap == null);
targetBitmap = new WriteableBitmap(
targetI.Right, targetI.Bottom, 96, 96, PixelFormats.Pbgra32, null);
targetBitmap.Lock();
}
// draw frame to target or intermediate bitmap
DrawFrameCore(targetBitmap, targetI, frameBitmap,
scalingX, scalingY, offset, scalingVector);
// copy intermediate bitmap to target context
if (targetContext != null)
{
targetBitmap.Unlock();
targetContext.DrawImage(targetBitmap,
new Rect(0, 0, targetBitmap.Width, targetBitmap.Height));
}
}
}
