/// <summary>
/// 去除图片的多余边界
/// </summary>
/// <param name="index"></param>
private void RemoveRedundance(int index, double left, double top)
{
System.Drawing.Bitmap bitmapSource = ConvertClass.BitmapImageToBitMap((BitmapImage)keyFrames[index].Image.Source);
System.Drawing.Bitmap bitmapTarget = new System.Drawing.Bitmap(bitmapSource.Width, bitmapSource.Height);
StylusPointCollection points = trackStroke.StylusPoints;
double pointWidth = keyFrames[index].Image.Width / bitmapSource.Width;
unsafe
{
if (index == 0)
{
for (int i = 0; i < bitmapSource.Width; i++)
{
for (int j = 0; j < bitmapSource.Height; j++)
{
System.Drawing.Color pixelColor = bitmapSource.GetPixel(i, j);
System.Drawing.Color newColor = System.Drawing.Color.FromArgb(255, pixelColor.R, pixelColor.G, pixelColor.B);
StylusPoint currPoint = new StylusPoint(left + i * pointWidth, top + j * pointWidth);
int preIndexInStroke = points.IndexOf(keyPoints[index > 0 ? index - 1 : 0]);
int nextIndexInStroke = trackStroke.StylusPoints.IndexOf(keyPoints[index < keyPoints.Count - 1 ? index + 1 : keyPoints.Count - 1]);
double distance = distanceP2Points(currPoint, points, preIndexInStroke, nextIndexInStroke);
if (distance > imageHeight / 2)
{
newColor = System.Drawing.Color.FromArgb(0, pixelColor.R, pixelColor.G, pixelColor.B);
}
bitmapTarget.SetPixel(i, j, newColor);
}
}
}
else
{
//去除无用边界
int preIndexInStroke = points.IndexOf(keyPoints[index > 0 ? index - 1 : 0]);
int nextIndexInStroke = trackStroke.StylusPoints.IndexOf(keyPoints[index < keyPoints.Count - 1 ? index + 1 : keyPoints.Count - 1]);
StylusPoint middleKeyPoint = new StylusPoint(points[(preIndexInStroke + nextIndexInStroke) / 2].X, points[(preIndexInStroke + nextIndexInStroke) / 2].Y);
double maxDistanceCurr2MiddleKP = 0;
for (int i = 0; i < bitmapSource.Width; i++)
{
for (int j = 0; j < bitmapSource.Height; j++)
{
System.Drawing.Color pixelColor = bitmapSource.GetPixel(i, j);
System.Drawing.Color newColor = System.Drawing.Color.FromArgb(255, pixelColor.R, pixelColor.G, pixelColor.B);
StylusPoint currPoint = new StylusPoint(left + i * pointWidth, top + j * pointWidth);
double distance = distanceP2Points(currPoint, points, preIndexInStroke, nextIndexInStroke);
if (distance > imageHeight / 2)
{
newColor = System.Drawing.Color.FromArgb(0, pixelColor.R, pixelColor.G, pixelColor.B);
}
else
{
double DistanceCurr2PreKP = MathTool.getInstance().distanceP2P(currPoint, keyPoints[index - 1]);
double DistanceCurr2CurrKP = MathTool.getInstance().distanceP2P(currPoint, keyPoints[index]);
if (DistanceCurr2PreKP < DistanceCurr2CurrKP)
{
double DistanceCurr2MiddleKP = MathTool.getInstance().distanceP2P(currPoint, middleKeyPoint);
if (DistanceCurr2MiddleKP > maxDistanceCurr2MiddleKP)
{
maxDistanceCurr2MiddleKP = DistanceCurr2MiddleKP;
}
}
}
bitmapTarget.SetPixel(i, j, newColor);
}
}
//添加渐变效果
for (int i = 0; i < bitmapSource.Width; i++)
{
for (int j = 0; j < bitmapSource.Height; j++)
{
System.Drawing.Color pixelColor = bitmapTarget.GetPixel(i, j);
if (pixelColor.A != 0)
{
System.Drawing.Color newColor = System.Drawing.Color.FromArgb(255, pixelColor.R, pixelColor.G, pixelColor.B);
StylusPoint currPoint = new StylusPoint(left + i * pointWidth, top + j * pointWidth);
double DistanceCurr2PreKP = MathTool.getInstance().distanceP2P(currPoint, keyPoints[index - 1]);
double DistanceCurr2CurrKP = MathTool.getInstance().distanceP2P(currPoint, keyPoints[index]);
double distance = distanceP2Points(currPoint, points, preIndexInStroke, nextIndexInStroke);
//为了衔接效果好，没有在前一副图片的点，不修改透明度
bool isInPreImage = MathTool.getInstance().isCloseRectangle(new Point(currPoint.X, currPoint.Y),
MathTool.getInstance().RectToRectangle(new Rect(keyFrames[index - 1].Image.Margin.Left, keyFrames[index - 1].Image.Margin.Top, keyFrames[index - 1].Image.Width, keyFrames[index - 1].Image.Height)), 0);
if (isInPreImage && maxDistanceCurr2MiddleKP != 0 && DistanceCurr2PreKP < DistanceCurr2CurrKP)
{
double DistanceCurr2MiddleKP = MathTool.getInstance().distanceP2P(currPoint, middleKeyPoint);
double rate = 1 - DistanceCurr2MiddleKP / maxDistanceCurr2MiddleKP;
newColor = System.Drawing.Color.FromArgb((byte)(255 * rate), pixelColor.R, pixelColor.G, pixelColor.B);
}
//if (distance <= imageHeight / 2 && distance >= imageHeight / 3)
//{
// newColor = System.Drawing.Color.FromArgb(255, pixelColor.R, pixelColor.G, pixelColor.B);
//}
bitmapTarget.SetPixel(i, j, newColor);
}
}
}
}
MemoryStream ms = new MemoryStream();
bitmapTarget.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.BeginInit();
bitmapImage.StreamSource = new MemoryStream(ms.ToArray());
bitmapImage.EndInit();
keyFrames[index].Image.Source = bitmapImage;
}
}
