/*

     File: EvenBetterWormView.m

 Abstract:  This subclass of WormView, GoodWormView, and BetterWormView uses an NSLayoutManager to cache the layout and thus redraw the string very quickly.

  Version: 1.2

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 */

#import "EvenBetterWormView.h"

@implementation EvenBetterWormView

- (void)setString:(NSString *)string {

    [super setString:string];

    if (!wormStorage) {

        wormStorage = [[NSTextStorage alloc] init];

        wormLayout = [[NSLayoutManager alloc] init];

        wormContainer = [[NSTextContainer alloc] init];

        [wormLayout addTextContainer:wormContainer];

        [wormStorage addLayoutManager:wormLayout];

    }

    [[wormStorage mutableString] setString:wormString];

    [wormStorage setAttributes:wormTextAttributes range:NSMakeRange(0, [wormStorage length])];

}

/* This drawRect is identical to one in BetterWormView, except it draws the glyphs directly out of the NSLayoutManager, rather than using NSString drawing. Because the same strings are being drawn over and over again, not using NSString drawing cuts down on the time required to set up the text system and compute and lay out the glyphs.

We still rely on the optimization done in performAnimation in BetterWormView.m to compute the tight update rect.

*/

- (void)drawRect:(NSRect)rect {

    NSUInteger i;

    NSRect tRect;

    [backgroundColor set];

    NSRectFill(rect);   // Fill in only the update rect, not whole bounds

    for (i = 0; i < wormLength; i++) {

        NSRect wRect = [self rectForPosition:wormPositions[i]];

        if (NSIntersectsRect(wRect, rect)) {    // Draw this portion of the body only if in the update rect

            NSUInteger glyphIndex = i % [wormLayout numberOfGlyphs];

            NSPoint glyphLocation = [wormLayout locationForGlyphAtIndex:glyphIndex];

            NSPoint origin = NSMakePoint(wRect.origin.x - glyphLocation.x, wRect.origin.y);

            [wormLayout drawGlyphsForGlyphRange:NSMakeRange(glyphIndex, 1) atPoint:origin];

        }

    }

    tRect = [self rectForPosition:targetPosition];

    if (NSIntersectsRect(tRect, rect)) {    // Draw target only if in the update rect

        [[NSColor blackColor] set];

        [[NSBezierPath bezierPathWithOvalInRect:NSInsetRect(tRect, 2, 2)] fill];

    }

}

// Override dealloc to release the items allocated

- (void)dealloc {

    [wormContainer release];

    [wormLayout release];

    [wormStorage release];

    [super dealloc];

}

@end