File content as of revision 16:d60e5187fd31:

//--------------------------------------------------------------
//  スペクトログラムで使うグローバル関数
//
//  2017/04/10, Copyright (c) 2017 MIKAMI, Naoki
//--------------------------------------------------------------

#ifndef METHOD_COLLECTION_HPP
#define METHOD_COLLECTION_HPP

#include "mbed.h"
#include "NumericLabel.hpp"
#include "Matrix.hpp"
#include "FFT_Analysis.hpp"

namespace Mikami
{
    // 強度を色相の違いに変換
    //      0.0 <= x <= 1.0
    uint32_t HueScale(float x)
    {
        if (x > 1) return LCD_COLOR_WHITE;
        int r = 0;
        int b = 0;

        if (x<0.5f) b = (x<0.33f) ? 255 : -(int)(1500.0f*x) + 750;
        else        r = (0.67f<x) ? 255 :  (int)(1500.0f*x) - 750;
        int g = 255 - (int)(1020.0f*(x - 0.5f)*(x - 0.5f));

        return 0xFF000000 | (((r << 8) | g) << 8) | b;
    }

    // 座標軸
    void DrawAxis(int x0, int y0, int w0, int h0, uint32_t axisColor,
                  uint16_t ms100, uint16_t px1kHz, LCD_DISCO_F746NG &lcd)
    {
        const uint16_t TICK = 5;    // 目盛線の長さ
        lcd.SetTextColor(axisColor);

        // 横標軸
        lcd.DrawHLine(x0, y0+TICK, w0);
        for (int n=0; n<=w0/ms100; n++)
            if ((n % 10)== 0) lcd.DrawVLine(x0+n*ms100, y0, 5);
            else              lcd.DrawVLine(x0+n*ms100, y0+3, 2);
        for (int n=0; n<=w0/ms100; n+=10)
            NumericLabel<int> num(x0+n*ms100, y0+TICK+3,
                                  "%1d", (int)(n*0.1f), Label::CENTER);
        Label time(x0+w0/2, y0+22, "TIME [s]", Label::CENTER);

        // 縦標軸
        lcd.DrawVLine(x0-TICK, y0-h0, h0);
        for (int n=0; n<=h0/px1kHz; n++)
            lcd.DrawHLine(x0-TICK, y0-n*px1kHz, TICK);
        for (int n=0; n<=h0/px1kHz; n++)
            NumericLabel<int> num(x0-TICK-12, y0-n*px1kHz-5, "%1d", n);
        Label hz(x0-32, y0-5*px1kHz-20, "[kHz]");
    }

    // 色と dB の関係の表示
    void ColorDb(int y0, uint32_t axisColor, LCD_DISCO_F746NG &lcd)
    {
        lcd.SetTextColor(axisColor);
        lcd.DrawVLine(455, y0-100, 100);
        for (int n=0; n<=8; n++)
            lcd.DrawHLine(455, y0-(n*100)/8, 4);
        for (int n=0; n<=4; n++)
            NumericLabel<int> num(440, y0-(n*100)/4-5, "%2d", n*20);
        Label dB(432, y0-120, "[dB]");

        for (int n=0; n<=101; n++)
        {
            lcd.SetTextColor(HueScale(n/100.0f));
            lcd.DrawHLine(460, y0-n, 16);
        }
    }

    // スペクトルの更新
    void SpectrumUpdate(Matrix<uint32_t> &x, FftAnalyzer &analyzer,
                        const Array<float> &sn, const Array<float> &db)
    {
        // 過去のスペクトルを一つずらす
        for (int n=0; n<x.Rows()-1; n++)
            for (int k=0; k<x.Cols(); k++)
                x[n][k] = x[n+1][k];

        // 新しいスペクトル
        analyzer.Execute(sn, db);
        const float FACTOR = 1.0f/80.0f;    // 表示範囲： 0 ～ 80 dB
        for (int k=0; k<=x.Cols(); k++)
            x[x.Rows()-1][k] = HueScale(FACTOR*((db[k] > 20) ? db[k]-20 : 0));
    }

    // スペクトルの表示
    void DisplaySpectrum(const Matrix<uint32_t> &x, int x0, int y0,
                         int hBar, LCD_DISCO_F746NG &lcd)
    {
        for (int n=0; n<x.Rows(); n++)
            for (int k=0; k<x.Cols(); k++)
            {
                lcd.SetTextColor(x[n][k]);
                lcd.DrawHLine(x0+n*hBar, y0-k, hBar);
            }
    }
}
#endif  // METHOD_COLLECTION_HPP