Re: Dragging Image
Re: Dragging Image
- Subject: Re: Dragging Image
- From: Herr Witten <email@hidden>
- Date: Sun, 1 Feb 2004 13:31:05 -0500
I have gotten it to work, but if you know of a better way, please let
me know.
- (NSImage *)dragImageForRows:(NSArray *)dragRows event:(NSEvent
*)dragEvent dragImageOffset:(NSPointPointer)dragImageOffset
{
NSImage* image = [super dragImageForRows: dragRows event: dragEvent
dragImageOffset: dragImageOffset];
NSImage* imageProper = [[NSImage alloc] initWithSize: [image size]];
[imageProper lockFocus];
[[[NSColor selectedControlColor] colorWithAlphaComponent: 0.5]
set];
NSRect fillRect = NSMakeRect(0, 0, 0, 0);
fillRect.size = [imageProper size];
[NSBezierPath fillRect: fillRect];
[image dissolveToPoint: NSMakePoint(0, 0) fraction: 1.0];
[imageProper unlockFocus];
if ([dragRows count] > 1 || [[dragRows objectAtIndex: 0] intValue]
== [self selectedRow])
{
NSBitmapImageRep* bitmap = [NSBitmapImageRep imageRepWithData:
[imageProper TIFFRepresentation]];
unsigned char* bitmapData = [bitmap bitmapData];
int n = [bitmap bitsPerPixel] / 8;
int pixelsWide = [bitmap pixelsWide];
int pixelsHigh = [bitmap pixelsHigh];
for (int y = 0; y < pixelsHigh; y++)
{
for (int x = 0; x < pixelsWide; x++)
{
unsigned char* blue = bitmapData;
unsigned char* green = ++bitmapData;
unsigned char* red = ++bitmapData;
if (*red < 110 && *green < 110 && *blue < 110)
{
*red = 255;
*green = 255;
*blue = 255;
}
bitmapData += 2;
}
}
[imageProper removeRepresentation: [[imageProper
representations] objectAtIndex: 0]];
[imageProper addRepresentation: bitmap];
}
return imageProper;
}
On 31 Jan 2004, at 10:48 PM, Herr Witten wrote:
>
How do I invert the text to make it white? Thanks.
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