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//
// UKPaintSelectTool.m
// UKPaintView
//
// Created by Uli Kusterer on Sat Nov 01 2003.
// Copyright (c) 2007 M. Uli Kusterer. All rights reserved.
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//

#import "ULIPaintSelectionRectangleTool.h"
#import "ULIPaintView.h"
#import "NSCursor+CrossHair.h"


@implementation ULIPaintSelectionRectangleTool

-(void) trackingWillStart
{
dragNotCreate = NSPointInRect( [owner initialPos], [owner selectionFrame] ); // Are we moving a selection or creating a new one?

// Remove old selection while user is drawing a new one with this tool:
// And don't show selection outline during drag for more exact positioning.
[owner setDrawSelectionHighlight: NO];
[owner setNeedsDisplay: YES];
}

/* Override this to draw a shape during tracking:
The drawings you do in here will be undone before you're called again.
This is also called when tracking has finished by drawFinalToolShapeFrom:to: by default. */
-(void) drawTemporaryTrackingToolShapeFrom: (NSPoint*)prevPos to: (NSPoint)currPos
{
NSRect box, oldBox;

if( dragNotCreate )
{
oldBox = [owner selectionFrame];
box = oldBox;

box.origin.x += currPos.x -prevPos->x;
box.origin.y += currPos.y -prevPos->y;

[owner setSelectionFrame: box];
}
else
{
NSPoint initialPos = [owner initialPos];
box = [self rectFrom: initialPos to: currPos];
oldBox = [self rectFrom: initialPos to: *prevPos];
}

[owner drawSelectionHighlightAroundPath: [NSBezierPath bezierPathWithRect: box]];

[owner selectionHighlightNeedsDisplayForRect: oldBox];
[owner selectionHighlightNeedsDisplayForRect: box];

*prevPos = currPos;
}


-(void) drawFinalToolShapeFrom: (NSPoint*)prevPos to: (NSPoint)currPos
{
if( !dragNotCreate )
{
NSPoint initialPos = [owner initialPos];
NSRect box = [self rectFrom: initialPos to: currPos];

box.origin.x = truncf(box.origin.x);
box.origin.y = truncf(box.origin.y);

// Merge old selection into our image:
NSRect oldSelBounds = NSZeroRect, oldSelFrame;
NSImage* selection = [owner floatingSelectionImage];
oldSelBounds.size = [selection size];
oldSelFrame = [owner selectionFrame];

[selection drawInRect: oldSelFrame fromRect: oldSelBounds operation: NSCompositeSourceOver fraction: 1.0];

[selection lockFocus];
// Clear old selection:
[[NSColor colorWithCalibratedWhite: 1.0 alpha: 0.0] set];
[NSBezierPath setDefaultLineWidth: 1];
NSRectFill(oldSelBounds);
[selection unlockFocus];

if( initialPos.x != currPos.x || initialPos.y != currPos.y )
{
[selection setSize: box.size];
[selection lockFocus];
// ... and copy the new one in:
NSRect boundsBox = box;
boundsBox.origin = NSZeroPoint;
[[owner image] drawInRect: boundsBox fromRect: box operation: NSCompositeCopy fraction: 1.0];
[selection unlockFocus];
[owner setSelectionFrame: box];

// Erase where new selection used to be:
[[NSColor colorWithCalibratedWhite: 1.0 alpha: 0.0] set];
[NSBezierPath setDefaultLineWidth: 1];
NSRectFill(box);
}
else
{
[selection setSize: NSMakeSize(8,8)]; // Save us some memory.
box.size = NSZeroSize;
box.origin = initialPos;
[owner setSelectionFrame: box];
}
}

[owner setDrawSelectionHighlight: YES]; // We turned it off, we turn it on again.
[owner setNeedsDisplay: YES];
[[owner window] invalidateCursorRectsForView: owner];

*prevPos = currPos;
}


-(NSCursor*) drawingCursor
{
return [NSCursor crossHairCursor];
}


-(NSCursor*) selectionCursor
{
return [NSCursor arrowCursor];
}


-(NSString*) toolIconName
{
return @"UKPaintSelectTool";
}



@end
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