wb32_color_chart：顯示基本顏色與名稱

derek

WiFiBoy32 的 TFT LCD 可以顯示 18bit 顏色，也就是 RGB 各 6 個 bits，一共可以顯示出 262144 種顏色。

但我們為了方便計算，以 2 個 bytes 來處理顏色，也就是有 65536 色。少了兩個 bits，RGB各為 5-6-5 bits。

Source codes:

/*
 *  Default Color Chart -- WiFiBoy32 Demo Code for Arduino/ESP32
 *
 *  Oct 13, 2017 Created. (derek@wifiboy.org)
 *
 */
#include "wifiboy32.h"
String colorName[]={
  "wbBLACK", "wbNAVY", "wbDARKGREEN", "wbDARKCYAN", "wbMAROON", "wbPURPLE", 
  "wbOLIVE", "wbLIGHTGREY", "wbDARKGREY", "wbBLUE", "wbGREEN", "wbCYAN", "wbRED", 
  "wbMAGENTA", "wbYELLOW", "wbWHITE", "wbORANGE", "wbGREENYELLOW", "wbPINK"
};
uint16_t _wbColor[]={
  wbBLACK, wbNAVY, wbDARKGREEN, wbDARKCYAN, wbMAROON, wbPURPLE, wbOLIVE,
  wbLIGHTGREY, wbDARKGREY, wbBLUE, wbGREEN, wbCYAN, wbRED, wbMAGENTA, wbYELLOW,
  wbWHITE, wbORANGE, wbGREENYELLOW, wbPINK 
};
void setup() 
{
  char numStr[5];
  
  wb32_init();
  wb32_fillScreen(0);
  
  wb32_setTextColor(wbYELLOW, wbYELLOW);
  wb32_drawString("WiFiBoy Color Chart", 16, 5, 1, 3);
  
  wb32_drawRect(24, 32, 102, 19*15, wbWHITE);
  wb32_setTextColor(wbWHITE, wbWHITE);
  for(int i=0; i<19; i++) {
    sprintf(numStr, "%d", i);
    wb32_drawString(numStr, 130, i*15+35, 2, 1);
    wb32_fillRect(25, i*15+33, 100, 13, _wbColor[i]);
    wb32_drawString(colorName[i].c_str(), 145, i*15+35, 2, 1); 
  }
}
void loop() 
{
}