// Paint application - Demonstate both TFT and Touch Screen
#include <stdint.h>
#include <SeeedTouchScreen.h>
#include <TFTv2.h>
#include <SPI.h>

int ColorPaletteHigh = 30;
int color = WHITE;  //Paint brush color
unsigned int colors[8] = {BLACK, RED, GREEN, BLUE, CYAN, YELLOW, WHITE, GRAY1};

// For better pressure precision, we need to know the resistance
// between X+ and X- Use any multimeter to read it
// The 2.8" TFT Touch shield has 300 ohms across the X plate

TouchScreen ts = TouchScreen(XP, YP, XM, YM); //init TouchScreen port pins

void setup() {
  Tft.TFTinit();  //init TFT library
  Serial.begin(115200);
  //Draw the pallet
  for (int i = 0; i < 8; i++) {
    Tft.fillRectangle(i * 30, 0, 30, ColorPaletteHigh, colors[i]);
  }
}

void loop() {
  // a point object holds x y and z coordinates.
  Point p = ts.getPoint();

  //map the ADC value read to into pixel co-ordinates

  p.x = map(p.x, TS_MINX, TS_MAXX, 0, 240);
  p.y = map(p.y, TS_MINY, TS_MAXY, 0, 320);

  // we have some minimum pressure we consider 'valid'
  // pressure of 0 means no pressing!

  if (p.z > __PRESURE) {
    // Detect  paint brush color change
    if (p.y < ColorPaletteHigh + 2) {
      color = colors[p.x / 30];
    } else {
      Tft.fillCircle(p.x, p.y, 2, color);
    }
  }
}
/*********************************************************************************************************
  END FILE
*********************************************************************************************************/