public static bool IsFlipped(this Matrix3x2Double matrix)
{
if (matrix.IsIdentity)
{
return(false);
}
VectorDouble vec = new VectorDouble(1.0, 0.0);
VectorDouble num2 = matrix.Transform(vec);
double num4 = Math.Atan2(num2.Y, num2.X) * 57.295779513082323;
VectorDouble num5 = new VectorDouble(0.0, 1.0);
VectorDouble num6 = matrix.Transform(num5);
double num8 = (Math.Atan2(num6.Y, num6.X) * 57.295779513082323) - 90.0;
while (num4 < 0.0)
{
num4 += 360.0;
}
while (num8 < 0.0)
{
num8 += 360.0;
}
double num9 = Math.Abs((double)(num4 - num8));
return((num9 > 1.0) && (num9 < 359.0));
}
public static double GetRotationRadians(this Matrix3x2Double matrix)
{
if (matrix.IsIdentity)
{
return(0.0);
}
VectorDouble vec = new VectorDouble(1.0, 0.0);
VectorDouble num2 = matrix.Transform(vec);
return(Math.Atan2(num2.Y, num2.X));
}
private void RenderMask(ISurface <ColorAlpha8> dstMask, PointInt32 renderOffset)
{
int width = dstMask.Width;
int height = dstMask.Height;
bool flag = false;
SizeInt32 size = new SizeInt32(width, height);
RectInt32 rectangle = new RectInt32(renderOffset, size);
if (!flag && this.matrix.HasInverse)
{
Matrix3x2Double inverse = this.matrix.Inverse;
PointDouble pt = inverse.Transform(rectangle.TopLeft);
PointDouble num7 = inverse.Transform(rectangle.TopRight);
PointDouble num8 = inverse.Transform(rectangle.BottomLeft);
PointDouble num9 = inverse.Transform(rectangle.BottomRight);
RectDouble srcCoverageBounds = this.srcCoverageBounds;
if ((srcCoverageBounds.Contains(pt) && srcCoverageBounds.Contains(num7)) && (srcCoverageBounds.Contains(num8) && srcCoverageBounds.Contains(num9)))
{
dstMask.Clear(ColorAlpha8.Opaque);
flag = true;
}
}
if (!flag)
{
GeometryRelation relation;
IDirect2DFactory perThread = Direct2DFactory.PerThread;
using (IRectangleGeometry geometry = perThread.CreateRectangleGeometry(rectangle))
{
base.ThrowIfCancellationRequested();
using (IRectangleGeometry geometry2 = perThread.CreateRectangleGeometry(this.srcCoverageBounds))
{
base.ThrowIfCancellationRequested();
relation = geometry.CompareWithGeometry(geometry2, new Matrix3x2Float?((Matrix3x2Float)this.matrix), null);
base.ThrowIfCancellationRequested();
}
}
switch (relation)
{
case GeometryRelation.IsContained:
dstMask.Clear(ColorAlpha8.Opaque);
flag = true;
break;
case GeometryRelation.Disjoint:
dstMask.Clear(ColorAlpha8.Transparent);
flag = true;
break;
}
}
if (!flag)
{
using (IDrawingContext context = DrawingContext.FromSurface(dstMask, FactorySource.PerThread))
{
base.ThrowIfCancellationRequested();
context.Clear(null);
context.AntialiasMode = AntialiasMode.PerPrimitive;
using (context.UseTranslateTransform((float)-renderOffset.X, (float)-renderOffset.Y, MatrixMultiplyOrder.Prepend))
{
using (context.UseTransformMultiply((Matrix3x2Float)this.matrix, MatrixMultiplyOrder.Prepend))
{
context.FillRectangle(this.srcCoverageBounds, whiteBrush);
}
}
}
}
}