/*

     File: EvenBetterThanBetterWormView.m

 Abstract:  This subclass of WormView, GoodWormView, BetterWormView, and EvenBetterWormView queries for the actual dirtied regions and thus redraws a much smaller portion of the view.

  Version: 1.2

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#import "EvenBetterThanBetterWormView.h"

@implementation EvenBetterThanBetterWormView

- (BOOL)performAnimation {

    BOOL done;

    GamePosition oldTargetPosition = targetPosition;

    NSUInteger i;

    // Compute a rect covering the worm's original position

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

        [self setNeedsDisplayInRect:[self rectForPosition:wormPositions[i]]];

    }

    // Update game state

    done = [self updateState];

    // Union in the new head (since the worm has moved)

    [self setNeedsDisplayInRect:[self rectForPosition:wormPositions[0]]];

    // If the target has changed locations, also include that in

    if (oldTargetPosition.x != targetPosition.x || oldTargetPosition.y != targetPosition.y) {

        [self setNeedsDisplayInRect:[self rectForPosition:targetPosition]];

    }

    return done;

}

- (void)drawRect:(NSRect)rect {

    const NSRect *rects;

    NSInteger rectsCount;

    [self getRectsBeingDrawn:&rects count:&rectsCount];

    [backgroundColor set];

    NSUInteger i;

    for (i = 0; i < rectsCount; i++) NSRectFill(rects[i]);

    NSRect tRect;

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

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

    if ([self needsToDrawRect:wRect]) { // Draw this portion of the body only if in the update region

            NSUInteger characterIndex = i % [wormString length];

            NSString *string = [wormString substringWithRange:NSMakeRange(characterIndex, 1)];

            [string drawInRect:wRect withAttributes: wormTextAttributes];

        }

    }

    tRect = [self rectForPosition:targetPosition];

    if ([self needsToDrawRect:tRect]) { // Draw target only if in the update rect

        [[NSColor blackColor] set];

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

    }

}

@end