138 lines
4 KiB
Mathematica
138 lines
4 KiB
Mathematica
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// SpectrumView.m
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// Cog
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//
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// Created by Christopher Snowhill on 2/12/22.
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//
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#import "SpectrumView.h"
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extern NSString *CogPlaybackDidBeginNotficiation;
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extern NSString *CogPlaybackDidPauseNotficiation;
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extern NSString *CogPlaybackDidResumeNotficiation;
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extern NSString *CogPlaybackDidStopNotficiation;
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@implementation SpectrumView
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- (void)awakeFromNib {
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visController = [NSClassFromString(@"VisualizationController") sharedController];
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timer = nil;
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theImage = [NSImage imageWithSize:NSMakeSize(64, 26)
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flipped:NO
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drawingHandler:^BOOL(NSRect dstRect) {
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NSColor *backColor = [NSColor textBackgroundColor];
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[backColor drawSwatchInRect:dstRect];
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return YES;
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}];
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stopped = YES;
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[self setImage:theImage];
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[self setImageScaling:NSImageScaleAxesIndependently];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(colorsDidChange:)
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name:NSSystemColorsDidChangeNotification
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object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(playbackDidBegin:)
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name:CogPlaybackDidBeginNotficiation
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object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(playbackDidPause:)
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name:CogPlaybackDidPauseNotficiation
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object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(playbackDidResume:)
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name:CogPlaybackDidResumeNotficiation
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object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(playbackDidStop:)
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name:CogPlaybackDidStopNotficiation
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object:nil];
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}
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- (void)repaint {
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{
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[theImage lockFocus];
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NSColor *backColor = [NSColor textBackgroundColor];
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[backColor drawSwatchInRect:NSMakeRect(0, 0, 64, 26)];
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NSBezierPath *bezierPath = [[NSBezierPath alloc] init];
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float visAudio[512], visFFT[256];
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if(!self->stopped) {
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[self->visController copyVisPCM:&visAudio[0] visFFT:&visFFT[0]];
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} else {
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memset(visFFT, 0, sizeof(visFFT));
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}
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for(int i = 0; i < 60; ++i) {
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CGFloat y = MAX(MIN(visFFT[i], 0.25), 0.0) * 4.0 * 22.0 + 2.0;
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[bezierPath moveToPoint:NSMakePoint(2 + i, 2)];
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[bezierPath lineToPoint:NSMakePoint(2 + i, y)];
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}
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NSColor *lineColor = [NSColor textColor];
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[lineColor setStroke];
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[bezierPath stroke];
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[theImage unlockFocus];
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}
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[self setNeedsDisplay];
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}
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- (void)startTimer {
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[self stopTimer];
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timer = [NSTimer timerWithTimeInterval:0.02
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target:self
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selector:@selector(timerRun:)
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userInfo:nil
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repeats:YES];
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[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
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}
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- (void)stopTimer {
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[timer invalidate];
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timer = nil;
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}
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- (void)timerRun:(NSTimer *)timer {
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[self repaint];
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}
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- (void)colorsDidChange:(NSNotification *)notification {
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[self repaint];
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}
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- (void)playbackDidBegin:(NSNotification *)notification {
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stopped = NO;
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[self startTimer];
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}
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- (void)playbackDidPause:(NSNotification *)notification {
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stopped = NO;
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[self stopTimer];
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}
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- (void)playbackDidResume:(NSNotification *)notification {
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stopped = NO;
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[self startTimer];
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}
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- (void)playbackDidStop:(NSNotification *)notification {
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[self stopTimer];
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stopped = YES;
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[self repaint];
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}
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- (void)drawRect:(NSRect)dirtyRect {
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[super drawRect:dirtyRect];
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}
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@end
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