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                The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

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*/

#import "DemoOverlayView.h"

#import <stdlib.h>

static double frandom(double start, double end)

{

    double r = random();

    r /= RAND_MAX;

    r = start + r*(end-start);

    return r;

}

@implementation DemoOverlayView

- (id)initWithFrame:(NSRect)frame {

    self = [super initWithFrame:frame];

    if (self) {

    int i, j;

    for(j = 0; j < 2; j++)

    {

        lines[NUM_LINES-1][j].x = frandom(0.0,frame.size.width);

        lines[NUM_LINES-1][j].y = frandom(0.0,frame.size.height);

        lines[NUM_LINES-1][j].dx = frandom(-5.0,5.0);

        lines[NUM_LINES-1][j].dy = frandom(-5.0,5.0);

    }

    for(i = 0; i < NUM_LINES-1; i++)

    {

        for(j = 0; j < 2; j++)

        {

            lines[i][j] = lines[i+1][j];

        }

    }

        // Initialization code here.

    }

    return self;

}

- (void)viewDidBecomeOverlay

{

    animationTimer = [[NSTimer timerWithTimeInterval:1.0f/30.0f

                target:self

                selector:@selector(animate:)

                userInfo:nil

                repeats:YES] retain];

    [[NSRunLoop currentRunLoop] addTimer:animationTimer forMode:NSDefaultRunLoopMode];

    [[NSRunLoop currentRunLoop] addTimer:animationTimer forMode:NSEventTrackingRunLoopMode];

}

- (void)viewWillResignOverlay

{

    [animationTimer invalidate];

    [animationTimer release];

    animationTimer = nil;

}

- (void)animate:(NSTimer *)timer

{

    int i, j;

    NSRect bounds = [self bounds];

    for(i = 0; i < NUM_LINES; i++)

    {

        for(j = 0; j < 2; j++)

        {

            if(i < NUM_LINES-1)

            {

                lines[i][j] = lines[i+1][j];

            }

            else

            {

                lines[i][j].x += lines[i][j].dx;

                lines[i][j].y += lines[i][j].dy;

                if(lines[i][j].x < 0)

                {

                    lines[i][j].x = 0;

                    lines[i][j].dx = -lines[i][j].dx;

                }

                else if(lines[i][j].x > bounds.size.width)

                {

                    lines[i][j].x = bounds.size.width;

                    lines[i][j].dx = -lines[i][j].dx;

                }

                if(lines[i][j].y < 0)

                {

                    lines[i][j].y = 0;

                    lines[i][j].dy = -lines[i][j].dy;

                }

                else if(lines[i][j].y > bounds.size.height)

                {

                    lines[i][j].y = bounds.size.height;

                    lines[i][j].dy = -lines[i][j].dy;

                }

            }

        }

    }

    [self setNeedsDisplay:YES];

}

- (void)drawRect:(NSRect)rect {

    // Drawing code here.

}

@end