//魔术棒判识
private void HandleMagicWand(object result, Dictionary <string, object> args)
{
GeometryOfDrawed geometry = result as GeometryOfDrawed;
IRasterDrawing drawing = GetRasterDrawing(_canvasViewer);
if (drawing == null)
{
return;
}
double prjX = 0, prjY = 0;
ICoordinateTransform tran = _canvasViewer.Canvas.CoordTransform;
//如果鼠标没有点中图像有效区域则直接退出
tran.Raster2Prj(geometry.RasterPoints[0].X, geometry.RasterPoints[0].Y, out prjX, out prjY);
if (prjX < drawing.OriginalEnvelope.MinX ||
prjX > drawing.OriginalEnvelope.MaxX ||
prjY < drawing.OriginalEnvelope.MinY ||
prjY > drawing.OriginalEnvelope.MaxY)
{
return;
}
//计算鼠标在当前视窗位图中的位置
int x = (int)((prjX - drawing.Envelope.MinX) / (drawing.Envelope.Width / (float)drawing.Bitmap.Width));
int y = (int)((drawing.Envelope.MaxY - prjY) / (drawing.Envelope.Height / (float)drawing.Bitmap.Height));
using (IBitmapMagicWand magicWand = new BitmapMagicWand())
{
Bitmap crtBitmap = drawing.Bitmap;
BitmapData pdata = crtBitmap.LockBits(new Rectangle(0, 0, crtBitmap.Width, crtBitmap.Height), ImageLockMode.ReadWrite, crtBitmap.PixelFormat);
try
{
byte tolerance = 32;
bool isContinued = true;
if (args != null && args.Count == 2)
{
tolerance = byte.Parse(args["tolerance"].ToString());
isContinued = bool.Parse(args["iscontinued"].ToString());
}
/*
* 魔术棒提取
* ScanLineSegment为像素坐标扫描线三元组(Row,BeginCol,EndCol)
*/
ScanLineSegment[] segs = magicWand.ExtractSnappedPixels(pdata, new Point(x, y), tolerance, isContinued);
/*
* 将扫描线数组转换为判识结果
*/
MagicWandResult2ExtractReulst(segs, drawing);
}
finally
{
crtBitmap.UnlockBits(pdata);
}
_canvasViewer.Canvas.Refresh(enumRefreshType.All);
}
}
private unsafe void Project(ContourLine cntLine, ICanvas canvas)
{
ICoordinateTransform tran = canvas.CoordTransform;
if (tran == null)
{
return;
}
int nCount = cntLine.Count;
fixed(PointF *ptr0 = cntLine.Points)
{
PointF *ptr = ptr0;
for (int i = 0; i < nCount; i++, ptr++)
{
tran.Raster2Prj(ptr);
}
}
cntLine.UpdateEnvelope();
}