/// <summary>Calculates intersection of the image and the render filter region in the coordinate system relative to the image.
/// </summary>
/// <returns>
/// <code>null</code> if the image is fully covered and therefore is completely cleaned,
/// <see cref="System.Collections.IList{E}"/>
/// of
/// <see cref="iText.Kernel.Geom.Rectangle"/>
/// objects otherwise.
/// </returns>
private IList <Rectangle> GetImageAreasToBeCleaned(ImageRenderInfo image)
{
Rectangle imageRect = CalcImageRect(image);
if (imageRect == null)
{
return(null);
}
IList <Rectangle> areasToBeCleaned = new List <Rectangle>();
foreach (Rectangle region in regions)
{
Rectangle intersectionRect = GetRectanglesIntersection(imageRect, region);
if (intersectionRect != null)
{
if (imageRect.EqualsWithEpsilon(intersectionRect))
{
// true if the image is completely covered
return(null);
}
areasToBeCleaned.Add(TransformRectIntoImageCoordinates(intersectionRect, image.GetImageCtm()));
}
}
return(areasToBeCleaned);
}
public virtual void GetIntersectionTest01()
{
//Cases where there is an intersection rectangle
Rectangle main;
Rectangle second;
Rectangle actual;
Rectangle expected;
bool areEqual;
main = new Rectangle(2, 2, 8, 8);
//A. Main rectangle is greater in both dimension than second rectangle
second = new Rectangle(4, 8, 4, 4);
//1.Middle top
expected = new Rectangle(4, 8, 4, 2);
actual = main.GetIntersection(second);
areEqual = expected.EqualsWithEpsilon(actual);
//2.Middle Right
second.MoveRight(4);
expected = new Rectangle(8, 8, 2, 2);
actual = main.GetIntersection(second);
areEqual = areEqual && (expected.EqualsWithEpsilon(actual));
//3.Right middle
second.MoveDown(4);
expected = new Rectangle(8, 4, 2, 4);
actual = main.GetIntersection(second);
areEqual = areEqual && (expected.EqualsWithEpsilon(actual));
//4.Bottom right
second.MoveDown(4);
expected = new Rectangle(8, 2, 2, 2);
actual = main.GetIntersection(second);
areEqual = areEqual && (expected.EqualsWithEpsilon(actual));
//5.Bottom middle
second.MoveLeft(4);
expected = new Rectangle(4, 2, 4, 2);
actual = main.GetIntersection(second);
areEqual = areEqual && (expected.EqualsWithEpsilon(actual));
//6.Bottom Left
second.MoveLeft(4);
expected = new Rectangle(2, 2, 2, 2);
actual = main.GetIntersection(second);
areEqual = areEqual && (expected.EqualsWithEpsilon(actual));
//7.Left Middle
second.MoveUp(4);
expected = new Rectangle(2, 4, 2, 4);
actual = main.GetIntersection(second);
areEqual = areEqual && (expected.EqualsWithEpsilon(actual));
//8.Left Top
second.MoveUp(4);
expected = new Rectangle(2, 8, 2, 2);
actual = main.GetIntersection(second);
areEqual = areEqual && (expected.EqualsWithEpsilon(actual));
//B. Main rectangle is greater in width but not height than second rectangle
//1. Left
second = new Rectangle(0, 0, 4, 12);
expected = new Rectangle(2, 2, 2, 8);
actual = main.GetIntersection(second);
areEqual = areEqual && (expected.EqualsWithEpsilon(actual));
//2. Middle
second.MoveRight(4);
expected = new Rectangle(4, 2, 4, 8);
actual = main.GetIntersection(second);
areEqual = areEqual && (expected.EqualsWithEpsilon(actual));
//3. Right
second.MoveRight(4);
expected = new Rectangle(8, 2, 2, 8);
actual = main.GetIntersection(second);
areEqual = areEqual && (expected.EqualsWithEpsilon(actual));
//C. Main rectangle is greater in height but not width than second rectangle
//1. Top
second = new Rectangle(0, 8, 12, 4);
expected = new Rectangle(2, 8, 8, 2);
actual = main.GetIntersection(second);
areEqual = areEqual && (expected.EqualsWithEpsilon(actual));
//2. Middle
second.MoveDown(4);
expected = new Rectangle(2, 4, 8, 4);
actual = main.GetIntersection(second);
areEqual = areEqual && (expected.EqualsWithEpsilon(actual));
//3. Bottom
second.MoveDown(4);
expected = new Rectangle(2, 2, 8, 2);
actual = main.GetIntersection(second);
areEqual = areEqual && (expected.EqualsWithEpsilon(actual));
//Check if any have failed
NUnit.Framework.Assert.IsTrue(areEqual);
}
