https://bugzilla.novell.com/show_bug.cgi?id=402613
Summary: Region.IsVisible() sometimes gives incorrect result
Product: Mono: Class Libraries
Version: 1.9.0
Platform: Other
OS/Version: Linux
Status: NEW
Severity: Normal
Priority: P5 - None
Component: Sys.Drawing.
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
QAContact: [email protected]
Found By: ---
Created an attachment (id=223636)
--> (https://bugzilla.novell.com/attachment.cgi?id=223636)
picture of what's happening
In some cases, IsVisible(Rectangle) method of a Region instance gives incorrect
result (example code below). In the example, an infinite region 'r' is created
and two Rectangles are Excluded, when r.IsVisible() is called on a specific
rectangle outside any of the excluded ones, Linux version of Mono says it is
not visible (output "False"). The Windows version of Mono and MS
implementation give the correct result (output "True"). See attached image for
a graphical explanation.
This only seems to happen in some cases, if I change the tested rectangle the
output is likely to be correct.
Tested in the official Mono openSUSE live CD (Mono 1.9.1).
Example code:
static void bug()
{
Region r = new Region();
r.MakeInfinite();
r.Exclude(new Rectangle(387,292,189,133));
r.Exclude(new Rectangle(387,66,189,133));
Console.WriteLine(r.IsVisible(new Rectangle(66,292,189,133)));
}
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