// a region with an "empty ctor" graphic path is "empty" (i.e. not infinite)
private void CheckEmpty (string prefix, Region region)
{
Assert.IsTrue (region.IsEmpty (graphic), prefix + "IsEmpty");
Assert.IsFalse (region.IsInfinite (graphic), prefix + "graphic");
RectangleF rect = region.GetBounds (graphic);
Assert.AreEqual (0f, rect.X, prefix + "GetBounds.X");
Assert.AreEqual (0f, rect.Y, prefix + "GetBounds.Y");
Assert.AreEqual (0f, rect.Width, prefix + "GetBounds.Width");
Assert.AreEqual (0f, rect.Height, prefix + "GetBounds.Height");
}
public GraphicsContext(Graphics g)
{
Matrix transform = g.Transform;
if (!transform.IsIdentity)
{
_transformOffset = transform.Offset;
}
transform.Dispose();
Region clip = g.Clip;
if (clip.IsInfinite(g))
{
clip.Dispose();
}
else
{
_clipRegion = clip;
}
}
public GraphicsContext(Graphics g)
{
Matrix transform = g.Transform;
if (!transform.IsIdentity)
{
float[] elements = transform.Elements;
this.transformOffset.X = elements[4];
this.transformOffset.Y = elements[5];
}
transform.Dispose();
Region clip = g.Clip;
if (clip.IsInfinite(g))
{
clip.Dispose();
}
else
{
this.clipRegion = clip;
}
}
/// <devdoc>
/// Creates a WindowsRegion from a System.Drawing.Region.
/// </devdoc>
public static WindowsRegion FromRegion( Region region, Graphics g ){
if (region.IsInfinite(g)){
// An infinite region would cover the entire device region which is the same as
// not having a clipping region. Observe that this is not the same as having an
// empty region, which when clipping to it has the effect of excluding the entire
// device region.
// To remove the clip region from a dc the SelectClipRgn() function needs to be
// called with a null region ptr - that's why we use the empty constructor here.
// GDI+ will return IntPtr.Zero for Region.GetHrgn(Graphics) when the region is
// Infinite.
return new WindowsRegion();
}
return WindowsRegion.FromHregion(region.GetHrgn(g), true);
}
public static WindowsRegion FromRegion(Region region, Graphics g)
{
if (region.IsInfinite(g))
{
return new WindowsRegion();
}
return FromHregion(region.GetHrgn(g), true);
}
public void GetHrgn_Empty_MakeInfinite ()
{
Region r = new Region (new GraphicsPath ());
Assert.IsTrue (r.IsEmpty (graphic), "Empty");
Assert.IsFalse (r.IsInfinite (graphic), "!Infinite");
IntPtr h = r.GetHrgn (graphic);
Assert.IsFalse (h == IntPtr.Zero, "Handle!=0");
r.MakeInfinite ();
Assert.IsFalse (r.IsEmpty (graphic), "!Empty");
Assert.IsTrue (r.IsInfinite (graphic), "Infinite");
Assert.AreEqual (IntPtr.Zero, r.GetHrgn (graphic), "Handle==0");
r.ReleaseHrgn (h);
}
public void EmptyPathWithInfiniteRegion ()
{
GraphicsPath gp = new GraphicsPath ();
Region region = new Region ();
Assert.IsTrue (region.IsInfinite (graphic), "IsInfinite");
region.Union (gp);
Assert.IsTrue (region.IsInfinite (graphic), "Union-IsInfinite");
region.Xor (gp);
Assert.IsTrue (region.IsInfinite (graphic), "Xor-IsInfinite");
region.Exclude (gp);
Assert.IsTrue (region.IsInfinite (graphic), "Exclude-IsInfinite");
region.Intersect (gp);
Assert.IsTrue (region.IsEmpty (graphic), "Intersect-IsEmpty");
region.MakeInfinite ();
region.Complement (gp);
Assert.IsTrue (region.IsEmpty (graphic), "Complement-IsEmpty");
}
public void Region_Rectangle_IsInfinite ()
{
GraphicsPath gp = new GraphicsPath ();
gp.AddRectangle (new Rectangle (-4194304, -4194304, 8388608, 8388608));
CheckInfiniteBounds (gp);
Region region = new Region (gp);
Assert.IsTrue (region.IsInfinite (graphic), "IsInfinite");
}
public void InfinityTranslate ()
{
using (Region r = new Region ()) {
Assert.IsTrue (r.IsInfinite (graphic), "before");
r.Translate (10, 10);
Assert.IsTrue (r.IsInfinite (graphic), "after");
CheckEmpty ("InfinityTranslate", r);
}
}
public void InfinityIntersectTransform ()
{
using (Region r = new Region ()) {
Assert.IsTrue (r.IsInfinite (graphic), "before");
r.Intersect (new Rectangle (-10, -10, 20, 20));
using (Matrix m = new Matrix (2, 0, 0, 0.5f, 10, 10)) {
r.Transform (m);
}
RectangleF bounds = r.GetBounds (graphic);
Assert.AreEqual (-10, bounds.X, "X");
Assert.AreEqual (5, bounds.Y, "Y");
Assert.AreEqual (40, bounds.Width, "Width");
Assert.AreEqual (10, bounds.Height, "Height");
}
}
public void InfinityIntersectTranslate ()
{
using (Region r = new Region ()) {
Assert.IsTrue (r.IsInfinite (graphic), "before");
r.Intersect (new Rectangle (-10, -10, 20, 20));
r.Translate (10, 10);
RectangleF bounds = r.GetBounds (graphic);
Assert.AreEqual (0, bounds.X, "X");
Assert.AreEqual (0, bounds.Y, "Y");
Assert.AreEqual (20, bounds.Width, "Width");
Assert.AreEqual (20, bounds.Height, "Height");
}
}
public void InfinityExclude ()
{
using (Region r = new Region ()) {
Assert.IsTrue (r.IsInfinite (graphic), "before");
r.Exclude (new Rectangle (5, 5, 10, 10));
Assert.IsFalse (r.IsInfinite (graphic), "after");
RectangleF bounds = r.GetBounds (graphic);
Assert.AreEqual (-4194304, bounds.X, "X");
Assert.AreEqual (-4194304, bounds.Y, "Y");
Assert.AreEqual (8388608, bounds.Width, "Width");
Assert.AreEqual (8388608, bounds.Height, "Height");
}
}
public void Region_Infinite_MultipleRectangles ()
{
Region region = new Region ();
Assert.IsTrue (region.IsInfinite (graphic), "Empty.IsInfinite");
GraphicsPath gp = new GraphicsPath ();
gp.AddRectangle (new Rectangle (-4194304, -4194304, 8388608, 8388608));
region = new Region (gp);
Assert.IsTrue (region.IsInfinite (graphic), "OneRectangle.IsInfinite");
gp.AddRectangle (new Rectangle (1, 1, 2, 2));
region = new Region (gp);
Assert.IsFalse (region.IsInfinite (graphic), "TwoOverlappingRectangle.IsInfinite");
gp = new GraphicsPath ();
gp.AddRectangle (new Rectangle (-4194304, -4194304, 4194304, 8388608));
gp.AddRectangle (new Rectangle (0, -4194304, 4194304, 8388608));
Assert.IsFalse (region.IsInfinite (graphic), "TwoSideBySideRectangle.IsInfinite");
}
public void TestInfiniteAndEmpty()
{
Bitmap bmp = new Bitmap (600, 800);
Graphics dc = Graphics.FromImage (bmp);
Rectangle rect1, rect2;
Region rgn1;
RectangleF [] rects;
Matrix matrix = new Matrix ();
rect1 = new Rectangle (500, 30, 60, 80);
rect2 = new Rectangle (520, 40, 60, 80);
rgn1 = new Region (rect1);
rgn1.Union (rect2);
Assert.AreEqual (false, rgn1.IsEmpty (dc));
Assert.AreEqual (false, rgn1.IsInfinite (dc));
rgn1.MakeEmpty();
Assert.AreEqual (true, rgn1.IsEmpty (dc));
rgn1 = new Region (rect1);
rgn1.Union (rect2);
rgn1.MakeInfinite ();
rects = rgn1.GetRegionScans (matrix);
Assert.AreEqual (1, rects.Length);
Assert.AreEqual (-4194304, rects[0].X);
Assert.AreEqual (-4194304, rects[0].Y);
Assert.AreEqual (8388608, rects[0].Width);
Assert.AreEqual (8388608, rects[0].Height);
Assert.AreEqual (true, rgn1.IsInfinite (dc));
}
public void GetHrgn_Infinite_MakeEmpty ()
{
Region r = new Region ();
Assert.IsFalse (r.IsEmpty (graphic), "!Empty");
Assert.IsTrue (r.IsInfinite (graphic), "Infinite");
Assert.AreEqual (IntPtr.Zero, r.GetHrgn (graphic), "Handle==0");
r.MakeEmpty ();
Assert.IsTrue (r.IsEmpty (graphic), "Empty");
Assert.IsFalse (r.IsInfinite (graphic), "!Infinite");
IntPtr h = r.GetHrgn (graphic);
Assert.IsFalse (h == IntPtr.Zero, "Handle!=0");
#if NET_2_0
r.ReleaseHrgn (h);
#endif
}
public void Region_Curve_IsInfinite ()
{
Point[] points = new Point[2] { new Point (-4194304, -4194304), new Point (4194304, 4194304) };
GraphicsPath gp = new GraphicsPath ();
gp.AddCurve (points);
CheckInfiniteBounds (gp);
Region region = new Region (gp);
Assert.IsFalse (region.IsInfinite (graphic), "IsInfinite");
// note: infinity isn't based on the bounds
}
public void Region_Polygon5_IsInfinite ()
{
// overlap the first/last point
Point[] points = new Point[5] { new Point (-4194304, -4194304), new Point (-4194304, 4194304), new Point (4194304, 4194304), new Point (4194304, -4194304), new Point (-4194304, -4194304) };
GraphicsPath gp = new GraphicsPath ();
gp.AddPolygon (points);
CheckInfiniteBounds (gp);
Region region = new Region (gp);
Assert.IsTrue (region.IsInfinite (graphic), "IsInfinite");
}
public void InfinityScaleDown ()
{
using (Region r = new Region ()) {
Assert.IsTrue (r.IsInfinite (graphic), "before");
using (Matrix m = new Matrix ()) {
m.Scale (0.5f, 0.5f);
r.Transform (m);
}
Assert.IsTrue (r.IsInfinite (graphic), "after");
CheckEmpty ("InfinityScaleDown", r);
}
}
public void InfinityRotate ()
{
using (Region r = new Region ()) {
Assert.IsTrue (r.IsInfinite (graphic), "before");
using (Matrix m = new Matrix ()) {
m.Rotate (45);
r.Transform (m);
}
Assert.IsTrue (r.IsInfinite (graphic), "after");
CheckEmpty ("InfinityRotate", r);
}
}
public void Complement_383878 ()
{
using (Region clipRegion = new Region ()) {
clipRegion.MakeInfinite ();
Rectangle smaller = new Rectangle (5, 5, -10, -10);
Rectangle bigger = new Rectangle (-5, -5, 12, 12);
clipRegion.Intersect (smaller);
clipRegion.Complement (bigger);
Assert.IsFalse (clipRegion.IsEmpty (graphic), "IsEmpty");
Assert.IsFalse (clipRegion.IsInfinite (graphic), "IsInfinite");
RectangleF [] rects = clipRegion.GetRegionScans (new Matrix ());
Assert.AreEqual (2, rects.Length, "Length");
Assert.AreEqual (new RectangleF (5, -5, 2, 10), rects [0], "0");
Assert.AreEqual (new RectangleF (-5, 5, 12, 2), rects [1], "1");
}
}
public void EmptyRegionWithInfiniteRegion ()
{
Region empty = new Region ();
empty.MakeEmpty ();
Assert.IsTrue (empty.IsEmpty (graphic), "IsEmpty");
Region region = new Region ();
Assert.IsTrue (region.IsInfinite (graphic), "IsInfinite");
region.Union (empty);
Assert.IsTrue (region.IsInfinite (graphic), "Union-IsInfinite");
region.Xor (empty);
Assert.IsTrue (region.IsInfinite (graphic), "Xor-IsInfinite");
region.Exclude (empty);
Assert.IsTrue (region.IsInfinite (graphic), "Exclude-IsInfinite");
region.Intersect (empty);
Assert.IsTrue (region.IsEmpty (graphic), "Intersect-IsEmpty");
region.MakeInfinite ();
region.Complement (empty);
Assert.IsTrue (region.IsEmpty (graphic), "Complement-IsEmpty");
}
public void ctor_void () {
Region r1 = new Region ();
Assert.IsTrue (r1.IsInfinite (t.Graphics));
}
