466 lines
20 KiB
C#
466 lines
20 KiB
C#
using LibAudioVisualizer;
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using NAudio.CoreAudioApi;
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using NAudio.Wave;
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using System.Drawing.Drawing2D;
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using System.Numerics;
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namespace AudioVisualizer
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{
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public partial class MainWindow : Form
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{
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WasapiCapture capture; // 音频捕获
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Visualizer visualizer; // 可视化
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double[]? spectrumData; // 频谱数据
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Color[] allColors; // 渐变颜色
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public MainWindow()
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{
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capture = new WasapiLoopbackCapture(); // 捕获电脑发出的声音
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visualizer = new Visualizer(256); // 新建一个可视化器, 并使用 256 个采样进行傅里叶变换
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allColors = GetAllHsvColors(); // 获取所有的渐变颜色 (HSV 颜色)
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capture.WaveFormat = WaveFormat.CreateIeeeFloatWaveFormat(8192, 1); // 指定捕获的格式, 单声道, 32位深度, IeeeFloat 编码, 8192采样率
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capture.DataAvailable += Capture_DataAvailable; // 订阅事件
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InitializeComponent();
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}
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/// <summary>
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/// 获取 HSV 中所有的基础颜色 (饱和度和明度均为最大值)
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/// </summary>
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/// <returns>所有的 HSV 基础颜色(共 256 * 6 个, 并且随着索引增加, 颜色也会渐变)</returns>
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private Color[] GetAllHsvColors()
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{
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Color[] result = new Color[256 * 6];
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for (int i = 0; i < 256; i++)
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{
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result[i] = Color.FromArgb(255, i, 0);
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}
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for (int i = 0; i < 256; i++)
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{
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result[256 + i] = Color.FromArgb(255 - i, 255, 0);
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}
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for (int i = 0; i < 256; i++)
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{
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result[512 + i] = Color.FromArgb(0, 255, i);
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}
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for (int i = 0; i < 256; i++)
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{
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result[768 + i] = Color.FromArgb(0, 255 - i, 255);
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}
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for (int i = 0; i < 256; i++)
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{
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result[1024 + i] = Color.FromArgb(i, 0, 255);
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}
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for (int i = 0; i < 256; i++)
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{
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result[1280 + i] = Color.FromArgb(255, 0, 255 - i);
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}
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return result;
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}
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/// <summary>
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/// 当捕获有数据的时候, 就怼到可视化器里面
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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private void Capture_DataAvailable(object? sender, WaveInEventArgs e)
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{
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int length = e.BytesRecorded / 4; // 采样的数量 (每一个采样是 4 字节)
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double[] result = new double[length]; // 声明结果
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for (int i = 0; i < length; i++)
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result[i] = BitConverter.ToSingle(e.Buffer, i * 4); // 取出采样值
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visualizer.PushSampleData(result); // 将新的采样存储到 可视化器 中
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}
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/// <summary>
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/// 用来刷新频谱数据以及实现频谱数据缓动
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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private void DataTimer_Tick(object? sender, EventArgs e)
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{
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double[] newSpectrumData = visualizer.GetSpectrumData(); // 从可视化器中获取频谱数据
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newSpectrumData = Visualizer.GetBlurry(newSpectrumData, 2); // 平滑频谱数据
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spectrumData = newSpectrumData;
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}
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/// <summary>
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/// 绘制一个渐变的 波浪
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/// </summary>
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/// <param name="g">绘图目标</param>
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/// <param name="down">下方颜色</param>
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/// <param name="up">上方颜色</param>
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/// <param name="spectrumData">频谱数据</param>
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/// <param name="pointCount">波浪中, 点的数量</param>
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/// <param name="drawingWidth">波浪的宽度</param>
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/// <param name="xOffset">波浪的起始X坐标</param>
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/// <param name="yOffset">波浪的其实Y坐标</param>
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/// <param name="scale">频谱的缩放(使用负值可以翻转波浪)</param>
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private void DrawGradient(Graphics g, Color down, Color up, double[] spectrumData, int pointCount, int drawingWidth, float xOffset, float yOffset, double scale)
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{
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GraphicsPath path = new GraphicsPath();
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PointF[] points = new PointF[pointCount + 2];
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for (int i = 0; i < pointCount; i++)
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{
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double x = i * drawingWidth / pointCount + xOffset;
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double y = spectrumData[i * spectrumData.Length / pointCount] * scale + yOffset;
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points[i + 1] = new PointF((float)x, (float)y);
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}
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points[0] = new PointF(xOffset, yOffset);
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points[points.Length - 1] = new PointF(xOffset + drawingWidth, yOffset);
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path.AddCurve(points);
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float upP = (float)points.Min(v => v.Y);
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if (Math.Abs(upP - yOffset) < 1)
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return;
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using Brush brush = new LinearGradientBrush(new PointF(0, yOffset), new PointF(0, upP), down, up);
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g.FillPath(brush, path);
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}
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/// <summary>
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/// 绘制渐变的条形
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/// </summary>
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/// <param name="g">绘图目标</param>
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/// <param name="down">下方颜色</param>
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/// <param name="up">上方颜色</param>
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/// <param name="spectrumData">频谱数据</param>
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/// <param name="stripCount">条形的数量</param>
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/// <param name="drawingWidth">绘图的宽度</param>
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/// <param name="xOffset">绘图的起始 X 坐标</param>
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/// <param name="yOffset">绘图的起始 Y 坐标</param>
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/// <param name="spacing">条形与条形之间的间隔(像素)</param>
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/// <param name="scale"></param>
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private void DrawGradientStrips(Graphics g, Color down, Color up, double[] spectrumData, int stripCount, int drawingWidth, float xOffset, float yOffset, float spacing, double scale)
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{
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float stripWidth = (drawingWidth - spacing * stripCount) / stripCount;
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PointF[] points = new PointF[stripCount];
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for (int i = 0; i < stripCount; i++)
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{
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double x = stripWidth * i + spacing * i + xOffset;
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double y = spectrumData[i * spectrumData.Length / stripCount] * scale; // height
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points[i] = new PointF((float)x, (float)y);
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}
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float upP = (float)points.Min(v => v.Y < 0 ? yOffset + v.Y : yOffset);
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float downP = (float)points.Max(v => v.Y < 0 ? yOffset : yOffset + v.Y);
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if (downP < yOffset)
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downP = yOffset;
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if (Math.Abs(upP - downP) < 1)
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return;
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using Brush brush = new LinearGradientBrush(new PointF(0, downP), new PointF(0, upP), down, up);
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for (int i = 0; i < stripCount; i++)
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{
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PointF p = points[i];
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float y = yOffset;
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float height = p.Y;
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if (height < 0)
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{
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y += height;
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height = -height;
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}
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g.FillRectangle(brush, new RectangleF(p.X, y, stripWidth, height));
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}
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}
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/// <summary>
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/// 画曲线
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/// </summary>
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/// <param name="g"></param>
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/// <param name="pen"></param>
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/// <param name="spectrumData"></param>
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/// <param name="pointCount"></param>
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/// <param name="drawingWidth"></param>
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/// <param name="xOffset"></param>
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/// <param name="yOffset"></param>
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/// <param name="scale"></param>
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private void DrawCurve(Graphics g, Pen pen, double[] spectrumData, int pointCount, int drawingWidth, double xOffset, double yOffset, double scale)
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{
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PointF[] points = new PointF[pointCount];
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for (int i = 0; i < pointCount; i++)
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{
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double x = i * drawingWidth / pointCount + xOffset;
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double y = spectrumData[i * spectrumData.Length / pointCount] * scale + yOffset;
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points[i] = new PointF((float)x, (float)y);
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}
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g.DrawCurve(pen, points);
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}
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/// <summary>
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/// 画简单的圆环线条
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/// </summary>
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/// <param name="g"></param>
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/// <param name="brush"></param>
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/// <param name="spectrumData"></param>
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/// <param name="stripCount"></param>
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/// <param name="xOffset"></param>
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/// <param name="yOffset"></param>
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/// <param name="radius"></param>
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/// <param name="spacing"></param>
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/// <param name="rotation"></param>
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/// <param name="scale"></param>
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private void DrawCircleStrips(Graphics g, Brush brush, double[] spectrumData, int stripCount, double xOffset, double yOffset, double radius, double spacing, double rotation, double scale)
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{
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double rotationAngle = Math.PI / 180 * rotation;
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double blockWidth = MathF.PI * 2 / stripCount; // angle
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double stripWidth = blockWidth - MathF.PI / 180 * spacing; // angle
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PointF[] points = new PointF[stripCount];
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for (int i = 0; i < stripCount; i++)
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{
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double x = blockWidth * i + rotationAngle; // angle
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double y = spectrumData[i * spectrumData.Length / stripCount] * scale; // height
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points[i] = new PointF((float)x, (float)y);
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}
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for (int i = 0; i < stripCount; i++)
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{
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PointF p = points[i];
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double sinStart = Math.Sin(p.X);
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double sinEnd = Math.Sin(p.X + stripWidth);
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double cosStart = Math.Cos(p.X);
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double cosEnd = Math.Cos(p.X + stripWidth);
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PointF[] polygon = new PointF[]
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{
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new PointF((float)(cosStart * radius + xOffset), (float)(sinStart * radius + yOffset)),
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new PointF((float)(cosEnd * radius + xOffset), (float)(sinEnd * radius + yOffset)),
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new PointF((float)(cosEnd * (radius + p.Y) + xOffset), (float)(sinEnd * (radius + p.Y) + yOffset)),
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new PointF((float)(cosStart * (radius + p.Y) + xOffset), (float)(sinStart * (radius + p.Y) + yOffset)),
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};
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g.FillPolygon(brush, polygon);
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}
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}
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/// <summary>
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/// 画圆环渐变条
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/// </summary>
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/// <param name="g"></param>
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/// <param name="inner"></param>
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/// <param name="outer"></param>
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/// <param name="spectrumData"></param>
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/// <param name="stripCount"></param>
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/// <param name="xOffset"></param>
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/// <param name="yOffset"></param>
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/// <param name="radius"></param>
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/// <param name="spacing"></param>
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/// <param name="scale"></param>
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private void DrawCircleGradientStrips(Graphics g, Color inner, Color outer, double[] spectrumData, int stripCount, double xOffset, double yOffset, double radius, double spacing, double rotation, double scale)
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{
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double rotationAngle = Math.PI / 180 * rotation;
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double blockWidth = Math.PI * 2 / stripCount; // angle
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double stripWidth = blockWidth - MathF.PI / 180 * spacing; // angle
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PointF[] points = new PointF[stripCount];
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for (int i = 0; i < stripCount; i++)
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{
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double x = blockWidth * i + rotationAngle; // angle
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double y = spectrumData[i * spectrumData.Length / stripCount] * scale; // height
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points[i] = new PointF((float)x, (float)y);
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}
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double maxHeight = points.Max(v => v.Y);
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double outerRadius = radius + maxHeight;
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PointF[] polygon = new PointF[4];
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for (int i = 0; i < stripCount; i++)
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{
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PointF p = points[i];
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double sinStart = Math.Sin(p.X);
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double sinEnd = Math.Sin(p.X + stripWidth);
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double cosStart = Math.Cos(p.X);
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double cosEnd = Math.Cos(p.X + stripWidth);
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PointF
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p1 = new PointF((float)(cosStart * radius + xOffset),(float)(sinStart * radius + yOffset)),
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p2 = new PointF((float)(cosEnd * radius + xOffset),(float)(sinEnd * radius + yOffset)),
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p3 = new PointF((float)(cosEnd * (radius + p.Y) + xOffset), (float)(sinEnd * (radius + p.Y) + yOffset)),
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p4 = new PointF((float)(cosStart * (radius + p.Y) + xOffset), (float)(sinStart * (radius + p.Y) + yOffset));
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polygon[0] = p1;
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polygon[1] = p2;
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polygon[2] = p3;
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polygon[3] = p4;
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PointF innerP = new PointF((p1.X + p2.X) / 2, (p1.Y + p2.Y) / 2);
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PointF outerP = new PointF((p3.X + p4.X) / 2, (p3.Y + p4.Y) / 2);
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Vector2 offset = new Vector2(outerP.X - innerP.X, outerP.Y - innerP.Y);
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if (MathF.Sqrt(offset.X * offset.X + offset.Y * offset.Y) < 1) // 渐变笔刷两点之间距离不能太小
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continue;
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try
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{
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using LinearGradientBrush brush = new LinearGradientBrush(innerP, outerP, inner, outer); // 这里有玄学 bug, 这个 线性笔刷会 OutMemoryException
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g.FillPolygon(brush, polygon); // 但是实际上不应该有这个异常...
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}
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catch { }
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}
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}
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/// <summary>
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/// 画简单的线条
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/// </summary>
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/// <param name="g"></param>
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/// <param name="brush"></param>
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/// <param name="spectrumData"></param>
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/// <param name="stripCount"></param>
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/// <param name="drawingWidth"></param>
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/// <param name="xOffset"></param>
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/// <param name="yOffset"></param>
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/// <param name="spacing"></param>
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/// <param name="scale"></param>
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private void DrawStrips(Graphics g, Brush brush, double[] spectrumData, int stripCount, int drawingWidth, float xOffset, float yOffset, float spacing, double scale)
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{
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float stripWidth = (drawingWidth - spacing * stripCount) / stripCount;
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PointF[] points = new PointF[stripCount];
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for (int i = 0; i < stripCount; i++)
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{
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double x = stripWidth * i + spacing * i + xOffset;
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double y = spectrumData[i * spectrumData.Length / stripCount] * scale; // height
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points[i] = new PointF((float)x, (float)y);
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}
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for (int i = 0; i < stripCount; i++)
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{
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PointF p = points[i];
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float y = yOffset;
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float height = p.Y;
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if (height < 0)
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{
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y += height;
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height = -height;
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}
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g.FillRectangle(brush, new RectangleF(p.X, y, stripWidth, height));
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}
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}
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/// <summary>
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/// 画渐变的边框
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/// </summary>
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/// <param name="g"></param>
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/// <param name="inner"></param>
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/// <param name="outer"></param>
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/// <param name="area"></param>
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/// <param name="scale"></param>
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/// <param name="width"></param>
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private void DrawGradientBorder(Graphics g, Color inner, Color outer, Rectangle area, double scale, float width)
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{
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int thickness = (int)(width * scale);
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if (thickness < 1)
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return;
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Rectangle rect = new Rectangle(area.X, area.Y, area.Width, area.Height);
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Rectangle up = new Rectangle(rect.Location, new Size(rect.Width, thickness));
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Rectangle down = new Rectangle(new Point(rect.X, (int)(rect.X + rect.Height - scale * width)), new Size(rect.Width, thickness));
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Rectangle left = new Rectangle(rect.Location, new Size(thickness, rect.Height));
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Rectangle right = new Rectangle(new Point((int)(rect.X + rect.Width - scale * width), rect.Y), new Size(thickness, rect.Height));
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LinearGradientBrush upB = new LinearGradientBrush(up, outer, inner, LinearGradientMode.Vertical);
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LinearGradientBrush downB = new LinearGradientBrush(down, inner, outer, LinearGradientMode.Vertical);
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LinearGradientBrush leftB = new LinearGradientBrush(left, outer, inner, LinearGradientMode.Horizontal);
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LinearGradientBrush rightB = new LinearGradientBrush(right, inner, outer, LinearGradientMode.Horizontal);
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upB.WrapMode = downB.WrapMode = leftB.WrapMode = rightB.WrapMode = WrapMode.TileFlipXY;
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g.FillRectangle(upB, up);
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g.FillRectangle(downB, down);
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g.FillRectangle(leftB, left);
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g.FillRectangle(rightB, right);
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}
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int colorIndex = 0;
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double rotation = 0;
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BufferedGraphics? oldBuffer;
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private void DrawingTimer_Tick(object? sender, EventArgs e)
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{
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if (spectrumData == null)
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return;
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rotation += 0.1;
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colorIndex++;
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Color color1 = allColors[colorIndex % allColors.Length];
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Color color2 = allColors[(colorIndex + 200) % allColors.Length];
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double[] bassArea = Visualizer.TakeSpectrumOfFrequency(spectrumData, capture.WaveFormat.SampleRate, 250); // 低频区域
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double bassScale = bassArea.Average() * 100; // 低音导致的缩放 (比例数)
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double extraScale = Math.Min(drawingPanel.Width, drawingPanel.Height) / 6; // 低音导致的缩放 (乘上窗口大小)
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Rectangle border = new Rectangle(Point.Empty, drawingPanel.Size);
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BufferedGraphics buffer = BufferedGraphicsManager.Current.Allocate(drawingPanel.CreateGraphics(), drawingPanel.ClientRectangle);
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Graphics g = buffer.Graphics;
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if (oldBuffer != null)
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{
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//oldBuffer.Render(buffer.Graphics); // 如果你想要实现 "留影" 效果, 就取消注释这段代码, 并且将 g.Clear 改为 g.FillRectange(xxx, 半透明的黑色)
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oldBuffer.Dispose();
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}
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using Pen pen = new Pen(Color.Pink); // 画音频采样波形用的笔
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g.SmoothingMode = SmoothingMode.HighQuality; // 嗨嗨害, 那必须得是高质量绘图
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g.Clear(drawingPanel.BackColor);
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//DrawGradientBorder(g, Color.FromArgb(0, color1), color2, border, bassScale, drawingPanel.Width / 10);
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DrawGradientStrips(g, color1, color2, spectrumData, spectrumData.Length, drawingPanel.Width, 0, drawingPanel.Height, 3, -drawingPanel.Height * 50);
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//DrawCircleGradientStrips(g, color1, color2, spectrumData, spectrumData.Length, drawingPanel.Width / 2, drawingPanel.Height / 2, MathF.Min(drawingPanel.Width, drawingPanel.Height) / 4 + extraScale * bassScale, 1, rotation, drawingPanel.Width / 6 * 10);
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//DrawCurve(g, pen, visualizer.SampleData, visualizer.SampleData.Length, drawingPanel.Width, 0, drawingPanel.Height / 2, MathF.Min(drawingPanel.Height / 10, 100));
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buffer.Render();
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oldBuffer = buffer; // 保存一下 buffer (之所以不全局只使用一个 Buffer 是因为,,, 用户可能调整窗口大小, 所以每一帧都必须适应)
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}
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private void MainWindow_Load(object sender, EventArgs e)
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{
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capture.StartRecording();
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dataTimer.Start();
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drawingTimer.Start();
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}
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private void MainWindow_FormClosed(object sender, FormClosedEventArgs e)
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{
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Environment.Exit(0);
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|
}
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private void DrawingPanel_MouseDoubleClick(object sender, MouseEventArgs e)
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|
{
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WindowState = WindowState != FormWindowState.Maximized ? FormWindowState.Maximized : FormWindowState.Normal;
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FormBorderStyle = WindowState == FormWindowState.Maximized ? FormBorderStyle.None : FormBorderStyle.Sizable;
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}
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}
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} |