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SWEraserTool.m
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SWEraserTool.m
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/**
* Copyright 2007-2010 Soggy Waffles. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY SOGGY WAFFLES ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SOGGY WAFFLES OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of Soggy Waffles.
*/
#import "SWEraserTool.h"
#import "SWDocument.h"
@implementation SWEraserTool
// Generates the path to be drawn to the image
- (NSBezierPath *)pathFromPoint:(NSPoint)begin toPoint:(NSPoint)end
{
if (!path)
{
path = [[NSBezierPath bezierPath] retain];
[path setLineWidth:lineWidth];
}
//if (lineWidth <= 1)
//{
// Off-by-half: Cocoa drawing is done based on gridlines AROUND pixels.
// We want to actually fill the pixels themselves!
begin.x += 0.5;
begin.y += 0.5;
end.x += 0.5;
end.y += 0.5;
//}
[path moveToPoint:begin];
[path lineToPoint:end];
return path;
}
- (NSBezierPath *)performDrawAtPoint:(NSPoint)point
withMainImage:(NSBitmapImageRep *)mainImage
bufferImage:(NSBitmapImageRep *)bufferImage
mouseEvent:(SWMouseEvent)event
{
// Use the points clicked to build a redraw rectangle
[super addRedrawRectFromPoint:point toPoint:savedPoint];
if (event == MOUSE_UP)
{
[document handleUndoWithImageData:nil frame:NSZeroRect];
[SWImageTools drawToImage:mainImage fromImage:bufferImage withComposition:YES];
[SWImageTools clearImage:bufferImage];
[path release];
path = nil;
}
else
{
SWLockFocus(bufferImage);
// The best way I can come up with to clear the image
[SWImageTools clearImage:bufferImage];
[[NSGraphicsContext currentContext] setShouldAntialias:NO];
[NSGraphicsContext saveGraphicsState];
[[NSGraphicsContext currentContext] setCompositingOperation:NSCompositeCopy];
if (flags & NSAlternateKeyMask)
[frontColor setStroke];
else
[backColor setStroke];
[[self pathFromPoint:savedPoint toPoint:point] stroke];
[NSGraphicsContext restoreGraphicsState];
savedPoint = point;
SWUnlockFocus(bufferImage);
}
return nil;
}
- (NSCursor *)cursor
{
if (!customCursor) {
NSImage *customImage = [NSImage imageNamed:@"eraser-cursor.png"];
customCursor = [[NSCursor alloc] initWithImage:customImage hotSpot:NSMakePoint(2,13)];
}
return customCursor;
}
- (NSColor *)drawingColor
{
return backColor;
}
- (NSString *)description
{
return @"Eraser";
}
@end