arduino教程系列39-Arduino+Colordunio RGB 详细讲解与演示实验

/*
  ColorduinoPlasma - Plasma demo using Colorduino Library for Arduino
  此函数的功能是，让RGB模块显示出渐变的R、G、B的组合颜色。
  效果是和我们在街上看到的那个RGB全彩显示屏显示的是一样的，只不过是我们现在只做的是8X8的点阵。可以通过74HC595进行扩展达到更大的显示效果！
*/
 
#include <Colorduino.h>
 
typedef struct      //重新进行数据类型定义        
{
  unsigned char r;
  unsigned char g;
  unsigned char b;
} ColorRGB;   
 
//a color with 3 components: h, s and v  一个颜色由H ,S ,V三个部分组成
typedef struct 
{
  unsigned char h;
  unsigned char s;
  unsigned char v;
} ColorHSV;
 
unsigned char plasma[ColorduinoScreenWidth][ColorduinoScreenHeight];  //定义Colorduino Screen 的宽度和高度
long paletteShift;
 
 
//Converts an HSV color to RGB color —HSV颜色转换为RGB颜色
void HSVtoRGB(void *vRGB, void *vHSV) 
{
  float r, g, b, h, s, v; //这个函数的工作方式的类型是浮点型0和1
  float f, p, q, t;
  int i;
  ColorRGB *colorRGB=(ColorRGB *)vRGB; //两个RGB颜色相与的公式
  ColorHSV *colorHSV=(ColorHSV *)vHSV;
 
  h = (float)(colorHSV->h / 256.0);
  s = (float)(colorHSV->s / 256.0);
  v = (float)(colorHSV->v / 256.0);
 
  //如果饱和度为0，那这个颜色就是为白的颜色，也可以看得出是HSV和RGB的值是相等的！
  if(s == 0.0) {
    b = v;
    g = b;
    r = g;
  }
  //如果这个饱和度大于0，那就需要更复杂的计算
  else
  {
    h *= 6.0; //h=h*6.0把颜色调到0和6之间，这样就会比较好计算！
    i = (int)(floor(h)); //例如2.7变成2、3.01变成3或者4.9999变成4
    f = h - i;//the fractional part of h — h为小数部分
 
    p = (float)(v * (1.0 - s));
    q = (float)(v * (1.0 - (s * f)));
    t = (float)(v * (1.0 - (s * (1.0 - f))));
 
    switch(i)  //利用Switch进行判断
    {
      case 0: r=v; g=t; b=p; break;
      case 1: r=q; g=v; b=p; break;
      case 2: r=p; g=v; b=t; break;
      case 3: r=p; g=q; b=v; break;
      case 4: r=t; g=p; b=v; break;
      case 5: r=v; g=p; b=q; break;
      default: r = g = b = 0; break;
    }
  }
  colorRGB->r = (int)(r * 255.0);//得出RGB中R的数值
  colorRGB->g = (int)(g * 255.0);//得出RGB中G的数值
  colorRGB->b = (int)(b * 255.0);//得出RGB中B的数值
}
 
float dist(float a, float b, float c, float d) 
{
  return sqrt((c-a)*(c-a)+(d-b)*(d-b));//开平方根
}
 
 
void plasma_morph()
{
  unsigned char x,y;
  float value;
  ColorRGB colorRGB;
  ColorHSV colorHSV;
 
  for(y = 0; y < ColorduinoScreenHeight; y++)
    for(x = 0; x < ColorduinoScreenWidth; x++) {
      {
        value = sin(dist(x + paletteShift, y, 128.0, 128.0) / 8.0)
          + sin(dist(x, y, 64.0, 64.0) / 8.0)
          + sin(dist(x, y + paletteShift / 7, 192.0, 64) / 7.0)
          + sin(dist(x, y, 192.0, 100.0) / 8.0);
        colorHSV.h=(unsigned char)((value) * 128)&0xff;
        colorHSV.s=255; 
        colorHSV.v=255;
        HSVtoRGB(&colorRGB, &colorHSV);
 
        Colorduino.SetPixel(x, y, colorRGB.r, colorRGB.g, colorRGB.b);
      }
  }
  paletteShift++;
 
  Colorduino.FlipPage(); // 屏幕显示它交换缓冲区
}
 
/********************************************************
作者: ColorFill
功能: 填充整个画面颜色
参数: R: the value of RED.   Range:RED 0~255
      G: the value of GREEN. Range:RED 0~255
      B: the value of BLUE.  Range:RED 0~255
********************************************************/
void ColorFill(unsigned char R,unsigned char G,unsigned char B)
{
  PixelRGB *p = Colorduino.GetPixel(0,0);
  for (unsigned char y=0;y<ColorduinoScreenWidth;y++) {
    for(unsigned char x=0;x<ColorduinoScreenHeight;x++) {
      p->r = R;
      p->g = G;
      p->b = B;
      p++;
    }
  }
 
  Colorduino.FlipPage();
}
 
void setup()  //此函数是进行初始化的操作
{
  Colorduino.Init(); // 初始化Colorduino
 
  // compensate for relative intensity differences in R/G/B brightness
  // array of 6-bit base values for RGB (0~63)
  // whiteBalVal[0]=red
  // whiteBalVal[1]=green
  // whiteBalVal[2]=blue
  unsigned char whiteBalVal[3] = {36,63,63}; // for LEDSEE 6x6cm round matrix
  Colorduino.SetWhiteBal(whiteBalVal);
 
 
  // start with morphing plasma, but allow going to color cycling if desired.
  paletteShift=128000;
  unsigned char bcolor;
 
  //generate the plasma once
  for(unsigned char y = 0; y < ColorduinoScreenHeight; y++)
    for(unsigned char x = 0; x < ColorduinoScreenWidth; x++)
    {
      //the plasma buffer is a sum of sines
      bcolor = (unsigned char)
      (
            128.0 + (128.0 * sin(x*8.0 / 16.0))
          + 128.0 + (128.0 * sin(y*8.0 / 16.0))
      ) / 2;
      plasma[x][y] = bcolor;
    }
 
 //  调整白平衡的话，你可以取消这一行！
 //  在loop()函数中注释掉plasma_morph()
 //  用在whiteBalVal上面做实验
 //  ColorFill(255,255,255);
}
 
void loop()   //执行部分，相当于执行了plasma_morph()函数即可
{
  plasma_morph();
}