/// <summary>
/// Overlay one stroke on the image.
/// </summary>
/// <param name="img"></param>
/// <param name="s"></param>
/// <param name="size"></param>
/// PRI2: I believe we can use the DibGraphicsBuffer (see opaque ink handling above) to improve the
/// look of the transparency. This currently has the following shortcoming: The colors produced by the exported gif
/// from CP's highlight pens have some whiteness which causes a little fog over the dark colors
/// below, for example the yellow highlight over a black background results in a lighter dark color,
/// no longer quite black. In contrast the native ink mixing gives us nearly the original black. It is as if
/// the colors are on colored but clear mylar that overlay one another. It's probably possible to get this effect
/// with DrawImage somehow??
private void addTransparentStroke(Image img, Microsoft.Ink.Strokes s, double size)
{
Microsoft.Ink.Ink tmpInk = new Microsoft.Ink.Ink();
tmpInk.AddStrokesAtRectangle(s, s.GetBoundingBox());
//Make a GIF Image from the Stroke. Note that this image is assumed to be in a 500x500 pixel space.
byte[] ba = tmpInk.Save(Microsoft.Ink.PersistenceFormat.Gif);
Image inkImg = Image.FromStream(new MemoryStream(ba));
Graphics g = Graphics.FromImage(img);
//Get the origin from the ink Bounding Box (in ink space)
Rectangle inkBB = tmpInk.GetBoundingBox();
//Convert the origin of the ink rectangle to pixel space (500x500)
Microsoft.Ink.Renderer r = new Microsoft.Ink.Renderer();
Point inkOrigin = inkBB.Location;
r.InkSpaceToPixel(g, ref inkOrigin);
//Convert the transparency coefficient from 0-255 with 0==opaque to the range of 0-1 with 1==opaque.
int t1 = Math.Abs(tmpInk.Strokes[0].DrawingAttributes.Transparency - 255);
float t2 = (float)t1 / 255f;
//Setting transparency with a ColorMatrix
float[][] ptsArray =
{
new float[] { 1, 0, 0, 0, 0 }, //r
new float[] { 0, 1, 0, 0, 0 }, //g
new float[] { 0, 0, 1, 0, 0 }, //b
new float[] { 0, 0, 0, t2, 0 }, //alpha
new float[] { 0, 0, 0, 0, 1 }
};
ColorMatrix clrMatrix = new ColorMatrix(ptsArray);
ImageAttributes imgAttributes = new ImageAttributes();
imgAttributes.SetColorMatrix(clrMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
//Adjust Y origin to account for horizontal scroll. (scrollPos becomes more positive as ink goes upward.)
float scrolledYInkOrigin = (float)inkOrigin.Y - (500 * (float)scrollPos); //Still in 500x500 space
//Scale and locate the destination rectangle of the ink within the slide image:
RectangleF destRect = new RectangleF(
(float)inkOrigin.X * ((float)img.Width / 500f) * (float)size,
scrolledYInkOrigin * ((float)img.Height / 500f) * (float)size,
(float)inkImg.Width * ((float)img.Width / 500f) * (float)size,
(float)inkImg.Height * ((float)img.Height / 500f) * (float)size);
Rectangle destRect2 = new Rectangle((int)destRect.X, (int)destRect.Y, (int)destRect.Width, (int)destRect.Height);
//Draw the overlay:
g.DrawImage(inkImg, destRect2, 0, 0, inkImg.Width, inkImg.Height, GraphicsUnit.Pixel, imgAttributes);
g.Dispose();
}
private void AddOpaqueInkOverlayOld(double size, Image img)
{
//add the opaque ink overlay
if ((opaqueInk != null) && (opaqueInk.Strokes.Count > 0))
{
//Make a GIF Image from the ink. Note that this image is assumed to be in a 500x500 pixel space.
byte[] ba = opaqueInk.Save(Microsoft.Ink.PersistenceFormat.Gif);
Image inkImg = Image.FromStream(new MemoryStream(ba));
Graphics g = Graphics.FromImage(img);
GraphicsUnit gu = GraphicsUnit.Pixel;
//Get the origin from the ink Bounding Box (in ink space)
Rectangle inkBB = opaqueInk.GetBoundingBox();
//Convert the origin of the ink rectangle to pixel space (500x500)
Microsoft.Ink.Renderer r = new Microsoft.Ink.Renderer();
Point inkOrigin = inkBB.Location;
r.InkSpaceToPixel(g, ref inkOrigin);
//Adjust Y origin to account for horizontal scroll.
float scrolledYInkOrigin = (float)inkOrigin.Y - (500 * (float)scrollPos);
//Scale and locate the destination rectangle of the ink within the slide image:
RectangleF destRect = new RectangleF(
(float)inkOrigin.X * ((float)img.Width / 500f) * (float)size,
scrolledYInkOrigin * ((float)img.Height / 500f) * (float)size,
(float)inkImg.Width * ((float)img.Width / 500f) * (float)size,
(float)inkImg.Height * ((float)img.Height / 500f) * (float)size);
//Draw the overlay:
g.DrawImage(inkImg, destRect, inkImg.GetBounds(ref gu), GraphicsUnit.Pixel);
g.Dispose();
}
}
/// <summary>
/// Plays back ink data to a specified control
/// </summary>
/// <param name="destinationControl">
/// The control to play the Ink Data to.</param>
/// <param name="destinationRenderer">
/// The Ink Renderer used to convert ink data to display coordinates</param>
/// <param name="keepDestinationAspectRatio">
/// Specified whether to keep original aspect ratio of ink when scaling</param>
/// <param name="playbackRate">
/// The rate at which to play back the Ink Data</param>
protected void PlaybackRecordedData(Control destinationControl,
bool keepDestinationAspectRatio,
PacketPlaybackRate playbackRate,
System.Drawing.Drawing2D.Matrix iTrans)
{
if (null != PlaybackInk)
{
System.Drawing.Graphics g = destinationControl.CreateGraphics();
Microsoft.Ink.Renderer destinationRenderer = new Microsoft.Ink.Renderer();
destinationRenderer.SetViewTransform(iTrans);
// Set whether or not to keep ink aspect ratio in the display window
bool keepAspectRatio = keepDestinationAspectRatio;
// Declare scaling factors
float scaleFactorX = 1.0f;
float scaleFactorY = 1.0f;
// Get the size of the display window
System.Drawing.Size displayWindowSize = destinationControl.ClientSize;
// Get ink bounding box in ink space; convert the box's size to pixel;
System.Drawing.Rectangle inkBoundingBox = PlaybackInk.GetBoundingBox();
// Set the size and offset of the destination input
System.Drawing.Point inkBoundingBoxSize = new System.Drawing.Point(inkBoundingBox.Width, inkBoundingBox.Height);
// Convert the inkspace coordinate to pixels
destinationRenderer.InkSpaceToPixel(g, ref inkBoundingBoxSize);
// Get the offset of ink
System.Drawing.Point inkOffset = inkBoundingBox.Location;
// Determine what the scaling factor of the destination control is so
// we know how to correctly resize the ink data
getDisplayWindowScalingFactor(new System.Drawing.Size(inkBoundingBoxSize), displayWindowSize, keepAspectRatio, ref scaleFactorX, ref scaleFactorY);
// Iterate through all ink strokes and extract the packet data
foreach (Microsoft.Ink.Stroke currentStroke in PlaybackInk.Strokes)
{
// Convert the stroke's packet data to INPUT structs
INPUT[] inputs = SendInputInterop.StrokeToInputs(currentStroke, destinationRenderer, g, scaleFactorX, scaleFactorY, destinationControl, inkOffset);
if (null != inputs)
{
// Iterate through all the extracted INPUT data in order to send to destination control
for (int i = 0; i < inputs.Length; i++)
{
// Use the Win32 SendInput API to send the ink data point to the control
// Note that all playback will use the upper left of the destination control
// as the origin
SendInputInterop.SendInput(1, new INPUT[] { inputs[i] }, System.Runtime.InteropServices.Marshal.SizeOf(inputs[i]));
// Determine the delay between packets (within a stroke)
switch (playbackRate)
{
case PacketPlaybackRate.Default:
default:
System.Threading.Thread.Sleep(5);
break;
case PacketPlaybackRate.Slow:
System.Threading.Thread.Sleep(100);
break;
case PacketPlaybackRate.Fast:
break;
}
}
}
// Reset the focus to the destination control in case it has been changed
if (destinationControl.InvokeRequired)
{
GenericVoidCallback func = new GenericVoidCallback(delegate { destinationControl.Focus(); });
destinationControl.Invoke(func);
}
else
{
destinationControl.Focus();
}
// Create a delay between each stroke
if (0 != InterStrokeDelay)
{
System.Threading.Thread.Sleep((int)(InterStrokeDelay));
}
}
// dispose the graphics object
g.Dispose();
}
}