Good (otherwise I would have had to change a few things on my side).
The term "main" is very confusing and I did log the following radar a
while back.
6392495 Confusing documentation for NSScreen
It looks like it has been fixed (and is ready to be included in a
future documentation update).
Jesper
On Apr 1, 2009, at 3:27 PM, Peter Ammon wrote:
My mistake, I saw mainScreenRect and assumed it was the frame of what
Cocoa calls the main screen.
-Peter
On Apr 1, 2009, at 2:52 PM, Jesper Storm Bache wrote:
Forgive me for being dense. Where is the subtle bug?
The code is using CGMainDisplayID (not [NSScreen mainScreen] which
would be the display with the key window)
CGMainDisplayID is documented as:
=======
The main display is the display with its screen location at (0,0) in
global coordinates. In a system without display mirroring, the
display with the menu bar is typically the main display.
=======
I would expect that CGRectGetHeight(CGDisplayBounds (CGMainDisplayID
())) == zeroScreenHeight()?
Jesper Storm Bache
Core Technologies
Adobe Systems Inc
On Apr 1, 2009, at 12:25 PM, Peter Ammon wrote:
On Mar 31, 2009, at 9:34 PM, Trygve Inda wrote:
Using these two calls:
NSRect nsRect = [screen frame];
CGRect cgRect = CGDisplayBounds (displayID);
I get for my two screens:
NS x=0 y=0 w=2560 h=1600 // screen A
CG x=0 y=0 w=2560 h=1600
NS x=-1920 y=184 w=1920 h=1200 // screen B
CG x=-1920 y=216 w=1920 h=1200
It seems CG origin is Top, Left with y growing down, while NS is
origin
Bottom, Left, y growing up. So I convert CG to NS with:
// Convert CG coordinates from (TL, y down) to (BL, y up)
CGRect mainScreenRect = CGDisplayBounds (CGMainDisplayID ());
cgRect.origin.y = (cgRect.origin.y + cgRect.size.height -
mainScreenRect.size.height) * -1;
(216 + 1200 - 1600) * -1 = 184
Is there a system function that does this? NSRectFromCGRect does
not
do the
coordinate conversion.
No, there is no function to do this conversion.
Note that your conversion has a subtle bug that will fail for
multiple
displays. The CG coordinate system has its origin at the top of the
zero screen, not the main screen (which changes with the user
focus).
The zero screen is the screen at index zero in the +screens array.
So if you define a function like this:
CGFloat zeroScreenHeight(void) {
CGFloat result = 0;
NSArray *screens = [NSScreen screens];
if ([screens count] > 0) result = NSHeight([[screens objectAtIndex:
0] frame]);
return result;
}
then you can do screen-coordinate conversions like this:
NSMakePoint(cgPoint.x, zeroScreenHeight() - cgPoint.y);
NSMakeRect(cgRect.origin.x, zeroScreenHeight() - cgRect.origin.y -
cgRect.size.height, cgRect.size.width, cgRect.size.height);
-Peter
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