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SWLineTool.m
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SWLineTool.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 "SWLineTool.h"
#import "SWDocument.h"
@implementation SWLineTool
- (NSBezierPath *)pathFromPoint:(NSPoint)begin toPoint:(NSPoint)end
{
path = [NSBezierPath bezierPath];
[path setLineWidth:lineWidth];
[path moveToPoint:begin];
if (lineWidth <= 1)
{
begin.x += 0.5;
begin.y += 0.5;
end.x += 0.5;
end.y += 0.5;
}
if (flags & NSShiftKeyMask) {
// x and y are either positive or negative 1
NSInteger x = (end.x-begin.x) / abs(end.x-begin.x);
NSInteger y = (end.y-begin.y) / abs(end.y-begin.y);
// Theta is the angle formed by the mouse, in degrees (rad * 180/¹)
// atan()'s result is in radians
CGFloat theta = 180*atan((end.y-begin.y)/(end.x-begin.x)) / pi;
// Deciding whether it should be horizontal, vertical, or at 45¼
NSPoint newPoint = NSZeroPoint;
CGFloat size = fmin(abs(end.x-begin.x),abs(end.y-begin.y));
if (abs(theta) <= 67.5 && abs(theta) >= 22.5) {
// ¹/4
newPoint = NSMakePoint(size*x, size*y);
} else if (abs(theta) > 67.5) {
// ¹/2
newPoint = NSMakePoint(0, (end.y-begin.y));
} else {
// 0
newPoint = NSMakePoint((end.x - begin.x), 0);
}
[path relativeLineToPoint:newPoint];
} else {
[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:savedPoint toPoint:point];
[SWImageTools clearImage:bufferImage];
if (event == MOUSE_UP)
{
[document handleUndoWithImageData:nil frame:NSZeroRect];
drawToMe = mainImage;
}
else
drawToMe = bufferImage;
// Which color do we use?
if (event == MOUSE_DOWN)
primaryColor = (flags & NSAlternateKeyMask) ? backColor : frontColor;
SWLockFocus(drawToMe);
[[NSGraphicsContext currentContext] setShouldAntialias:NO];
[primaryColor setStroke];
[[self pathFromPoint:savedPoint toPoint:point] stroke];
SWUnlockFocus(drawToMe);
return nil;
}
- (NSCursor *)cursor
{
if (!customCursor) {
customCursor = [[NSCursor crosshairCursor] retain];
}
return customCursor;
}
- (NSString *)description
{
return @"Line";
}
@end