/// <summary>
/// Clips the bitmap according to the provided shape and plane. The BitmapBits are replaced by
/// transparent pixels, the original bits are lost. Setting another clip area doesn't restore already clipped
/// pixels. (Ofcourse undo restores the original bitmap bits)
/// </summary>
/// <param name="plane">The plane as a reference system for the shape</param>
/// <param name="shape">The shape for the clip operation</param>
public void Clip(Plane plane, CompoundShape shape)
{
#if !WEBASSEMBLY
Plane pln = new Plane(location, directionWidth, directionHeight);
CompoundShape prsh = shape.Project(plane, pln);
ModOp2D m = ModOp2D.Scale(bitmap.Width / directionWidth.Length, -bitmap.Height / directionHeight.Length);
prsh = prsh.GetModified(m);
m = ModOp2D.Translate(0, bitmap.Height);
prsh = prsh.GetModified(m);
GraphicsPath gp = prsh.CreateGraphicsPath();
using (new Changing(this))
{
Region rg = new Region(gp);
Bitmap clone = bitmap.Clone() as Bitmap;
Graphics graphics = Graphics.FromImage(bitmap);
graphics.Clear(Color.FromArgb(0, 0, 0, 0));
graphics.SetClip(rg, CombineMode.Replace);
graphics.DrawImage(clone, new System.Drawing.Point(0, 0));
graphics.Dispose();
}
#endif
}
/// <summary>
/// Overrides IGeoObjectImpl.<see cref="IGeoObjectImpl.Modify"/> and implements IGeoObject.<see cref="IGeoObject.Modify"/>.
/// </summary>
/// <param name="m">see <see cref="IGeoObject.Modify"/></param>
public override void Modify(ModOp m)
{
using (new Changing(this, "ModifyInverse", m))
{
// die ModOp wird in zwei Komponente aufgeteilt:
// eine Skalierungsfreie, die auf die Ebene angewendet wird
// und eine Skalierung, die nochmal auf die compoundShape wirkt
try
{
Plane newPlane = new Plane(m * plane.Location, m * plane.DirectionX, m * plane.DirectionY);
// die Ebene verändert sich gemäß der Matrix m, wie verändert sich die Umrandung im 2D?
// Die brutale Methode: aus den bekannten Veränderungen von 3 Punkten die Matrix bestimmen
// das funktioniert, alles andere hat bislang nicht geklappt
GeoPoint2D[] src = new GeoPoint2D[3];
GeoPoint2D[] dst = new GeoPoint2D[3];
src[0] = GeoPoint2D.Origin;
src[1] = GeoPoint2D.Origin + GeoVector2D.XAxis;
src[2] = GeoPoint2D.Origin + GeoVector2D.YAxis;
dst[0] = newPlane.Project(m * plane.ToGlobal(src[0]));
dst[1] = newPlane.Project(m * plane.ToGlobal(src[1]));
dst[2] = newPlane.Project(m * plane.ToGlobal(src[2]));
ModOp2D m2d = ModOp2D.Fit(src, dst, true);
compoundShape = compoundShape.GetModified(m2d);
plane = newPlane;
if (m.Mode == ModOp.ModificationMode.Translation && base.Count > 0)
{
containedObjects.Modify(m);
}
else
{
needsRecalc = true;
}
}
catch (PlaneException) { } // neue Ebene enthält Nullvector
}
}