/*  Copyright © 2007 Apple Inc. All Rights Reserved.

    Disclaimer: IMPORTANT:  This Apple software is supplied to you by 

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*/

#import "CAWaveformView.h"

#define NSRectToCGRect(r) CGRectMake(r.origin.x, r.origin.y, r.size.width, r.size.height)

@implementation CAWaveformView

#pragma mark ___Initialization___

- (void) Initialize

{

    backgroundColor = [[NSColor colorWithCalibratedRed: 95.0/255.0 green: 95.0/255.0 blue: 95.0/255.0 alpha:1.0] retain];

    lineColor = [[NSColor colorWithCalibratedRed: 0 green: 0 blue: 0 alpha:1.0] retain];

    [myBackgroundWell setColor:backgroundColor];        

    [myLineWell setColor: lineColor];

    if (waveformPoints) 

        free(waveformPoints);   

    waveformPoints = (CGPoint*) malloc(2*kMaxWaveformSamples*sizeof(CGPoint));  

}

- (id)initWithFrame:(NSRect)frame 

{

    self = [super initWithFrame:frame];

    if (self) {

        waveformPoints = NULL;

        [self Initialize];

   }

    return self;

}

- (void) dealloc

{   

    if (backgroundColor) [backgroundColor release];

    if (lineColor) [lineColor release];

    if (waveformPoints) {

        free(waveformPoints);

        waveformPoints = NULL;

    }

    [super dealloc];

}

#pragma mark ___IBActions___

- (void) setLineColor:(NSColor*) color

{

    if ( color != lineColor ) {

        [color retain];

        [lineColor release];

        lineColor = color;

    }

}

- (void) setBackgroundColor:(NSColor*) color

{

    if ( color != backgroundColor ) {

        [color retain];

        [backgroundColor release];

        backgroundColor = color;

    }

}

- (IBAction) changeBackgroundColor: (id) sender

{

    [self setBackgroundColor : [sender color]];

    [self setNeedsDisplay: YES];

}

- (IBAction) changeLineColor: (id) sender

{

    [self  setLineColor: [sender color]];

    [self setNeedsDisplay: YES];

}

#pragma mark ___Drawing___

- (NSRect) getRect

{

    return [self frame];

}

- (void) plotNum: (UInt32) num dataPoints:(Float32*) data

{

    if (num < 1) return;

    if ([myHoldButton state] == NSOnState) return;

    NSRect r = [self getRect];

    Float32 width   = r.size.width;

    Float32 height  = r.size.height;

    Float32 dy = height / 2. / 1.5;

    UInt32 pixelWidth = (UInt32) width; 

    UInt32 stride = num / pixelWidth;

    UInt32 mid = (UInt32) ( height / 2.0);

    // make the first point 

    waveformPointsCount = 0;

    Float32 value = mid + data[0] * dy;

    waveformPoints[waveformPointsCount].x = 0;

    waveformPoints[waveformPointsCount].y = value;

    waveformPointsCount++;

    UInt32 sampleIndex;

    for (UInt32 i= 1; i< pixelWidth; i++){

        sampleIndex = i*stride;     

        value = mid + data[sampleIndex] * dy;

        waveformPoints[waveformPointsCount].x   = i;

        waveformPoints[waveformPointsCount].y   = value;

        waveformPointsCount++;

        waveformPoints[waveformPointsCount].x   = i;

        waveformPoints[waveformPointsCount].y   = value;

        waveformPointsCount++;

     }

    value = waveformPoints[waveformPointsCount-1].y;

    waveformPoints[waveformPointsCount].x       = pixelWidth;

    waveformPoints[waveformPointsCount].y       = value;    

    [self setNeedsDisplay: YES];

}

- (void) drawRect: (NSRect) rect

{

    if (waveformPointsCount < 1) return;

    NSGraphicsContext *nsctx = [NSGraphicsContext currentContext];

    CGContextRef context = (CGContextRef)[nsctx graphicsPort];

    CGRect r = NSRectToCGRect(rect);

    CGContextSetRGBFillColor(context, 

    [backgroundColor redComponent], [backgroundColor greenComponent], [backgroundColor blueComponent], 

    [backgroundColor alphaComponent]);

    CGContextFillRect(context, r);

    CGContextSetRGBStrokeColor(context,[lineColor redComponent], [lineColor greenComponent], [lineColor blueComponent], 

    [lineColor alphaComponent]);

    CGContextStrokeLineSegments(context, waveformPoints, waveformPointsCount);

}

@end