//TFT LCD 塗鴨程式
#include <Adafruit_GFX.h>
#include <Adafruit_FT6206.h>
#include <Adafruit_ILI9341.h>

//定義接腳，包括SPI接腳
static byte SPI_PIN_CS = 15;
static byte PIN_DC = 2;
static byte PIN_RST = 5;
static byte PIN_SPI_MOSI=23;
static byte PIN_SPI_SCK=18;
static byte PIN_SPI_MISO=19;
static byte VR_PIN=32;
//定義調色盤寬高
static byte WIDTH = 40;
static byte HEIGHT = 40;

//建立畫點顏色
uint32_t pixelColor;

int scale = 1;    //初設畫筆大小

//物件名：tft , 使用SPI接腳 CS,DC,MOSI,SCK,RST,MISO
//Adafruit_ILI9341 tft = Adafruit_ILI9341(SPI_PIN_CS, PIN_DC, PIN_SPI_MOSI, PIN_SPI_SCK, PIN_RST, PIN_SPI_MISO);
Adafruit_ILI9341 tft = Adafruit_ILI9341(SPI_PIN_CS, PIN_DC);//, PIN_SPI_MOSI, PIN_SPI_SCK, PIN_RST, PIN_SPI_MISO);

//SDA=GPIO21 ,SCL=GPIO22 為I2C接腳,控制資料讀取
Adafruit_FT6206 ts = Adafruit_FT6206();  //物件名稱：ts

void setup() {
  Serial.begin(115200);
  pinMode(VR_PIN, INPUT_PULLUP);
  tft.begin(); //初始化
  tft.setRotation(2); //轉向
  ts.begin(); //觸控啟動
  pixelColor = ILI9341_RED; //初設紅色筆
  //建立調色盤
  tft.fillRect(0,0,40,40,ILI9341_RED);
  tft.fillRect(40,0,40,40,ILI9341_GREEN);
  tft.fillRect(80,0,40,40,ILI9341_BLUE);
  tft.fillRect(120,0,40,40,ILI9341_YELLOW);
  tft.fillRect(160,0,40,40,ILI9341_MAGENTA);
  tft.fillRect(200,0,40,40,ILI9341_CYAN);
  Serial.println("點選顏色,可變線寬，開始塗鴨~~");
}
void loop() {
  int dotScale=analogRead(VR_PIN);  //讀取可變電阻值0~4095
  scale=map(dotScale,0,4095,1,30);  //scale轉換為0~30 改變筆寬
  TS_Point p;         // 建立觸控物件P
  if(ts.touched()){   // 若有觸點
    p = ts.getPoint();// 取得觸點座標，畫一圓點，半徑為scale
    if(p.y > HEIGHT) tft.fillCircle(p.x,p.y,scale,pixelColor);

    for(byte x = 0; x < 6; x++){  //觸點的x座標值0~5, 判斷點取之調色盤為何？
      //點選色筆，由x軸的座標判斷      
      if(p.x >= x * WIDTH && p.x <= (x + 1) * WIDTH && p.y <= HEIGHT){
        switch(x){
          case 0: pixelColor = ILI9341_RED; break;     //紅色盤
          case 1: pixelColor = ILI9341_GREEN; break;   //綠色盤
          case 2: pixelColor = ILI9341_BLUE;  break;   //綠色盤
          case 3: pixelColor = ILI9341_YELLOW;  break; //黃色盤
          case 4: pixelColor = ILI9341_MAGENTA;  break;//紫色盤
          case 5: pixelColor = ILI9341_CYAN;  break;   //青色盤
        }
      }
    }
  }
}