public void IntersectTest(IRectangle rectangle1, IRectangle rectangle2, IRectangle rectangleExpected)
{
TraceFile.SetName("IntersectTest");
var result = Service.Intersect(rectangle1, rectangle2);
if (rectangleExpected == null)
{
Assert.IsNull(result);
}
else
{
Assert.AreEqual(rectangleExpected.Left(), result.Left(), 0, "Left");
Assert.AreEqual(rectangleExpected.Top(), result.Top(), 0, "Top");
Assert.AreEqual(rectangleExpected.Width(), result.Width(), 0, "Width");
Assert.AreEqual(rectangleExpected.Height(), result.Height(), 0, "Height");
}
}
public IRectangle Intersect(IRectangle rectangle1, IRectangle rectangle2)
{
if (rectangle1 == null || rectangle2 == null)
{
return(null);
}
var maxLeft = Math.Max(rectangle1.Left(), rectangle2.Left());
var minRight = Math.Min(rectangle1.Right(), rectangle2.Right());
var maxTop = Math.Max(rectangle1.Top(), rectangle2.Top());
var minBottom = Math.Min(rectangle1.Bottom(), rectangle2.Bottom());
if (maxLeft < minRight && maxTop < minBottom)
{
return(new Rectangle(minRight - maxLeft, minBottom - maxTop, maxLeft, maxTop));
}
return(null);
}