/***************************************************
  
 ****************************************************/
#include "SPI.h"
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"


#define PI 3.1415926535897932384626433832795

#define _cs   15  
#define _dc   2   
#define _mosi 23  
#define _sclk 18  
#define _rst  4   
#define _miso 19

Adafruit_ILI9341 tft = Adafruit_ILI9341(_cs, _dc, _mosi, _sclk, _rst);

typedef struct {int xa; int ya; int xe; int ye;} linekoords;
linekoords lines [180];

int screenW=320;
int screenH=240;
int screenWdiv2=160;
int screenHdiv2=120;
int offset = 0;

void setup() {
  Serial.begin(9600);
  Serial.println("ILI9341 Test!"); 
 
  tft.begin();
  tft.setRotation(1);
  //tft.fillScreen(ILI9341_BLACK);
  tft.setCursor(0, 10);
  tft.setTextColor(ILI9341_WHITE);
  tft.setTextSize(2);
  tft.println("Hallo Welt!");
    
  for (int i = 0; i < 180; i++) {
    lines[i].xa = screenWdiv2 - (160 * sin((i + 90) * PI / 180));
    lines[i].ya = screenHdiv2 + (10 * sin(i * PI / 180));
    lines[i].xe = screenWdiv2 - (160 * sin((i + 90) * PI / 180));
    lines[i].ye = screenHdiv2 + (30 * sin(i * PI / 180));
     
    tft.drawLine(lines[i].xa, lines[i].ya, lines[i].xe, lines[i].ye, ILI9341_WHITE);
  }
delay(1000);
}

void loop() {

  for (int i=60; i<120;i++) {
    drawGradLines(i);
  }

}

void drawGradLines(int iGrad)
{

    int linef;
    int hAdd;
    int cGrad;

    hAdd = iGrad % 100;
    if (hAdd >= 10) hAdd = hAdd % 10;
    //Serial.println( hAdd);

    cGrad = 90 - iGrad + hAdd;
    if (cGrad < 0) cGrad = cGrad + 360;

    for (int i = 0; i < 180; i+=5) {

    
      if((i+cGrad)%5 == 0) linef=10;
      if((i+cGrad)%10 == 0) linef=20;
      if((i+cGrad)%30 == 0) linef=30;

      // das erste drawLine hat noch die alten werte aus der Initialisierung?
      // prüfen und erf. ändern
      tft.drawLine(lines[i].xa, lines[i].ya, lines[i].xe, lines[i].ye, ILI9341_BLACK);

      lines[i].xa = screenWdiv2 - (160 * sin((i + hAdd + 90) * PI / 180));
      lines[i].ya = screenHdiv2 - (linef * sin((i + hAdd) * PI / 180));
      lines[i].xe = screenWdiv2 - (160 * sin((i + hAdd + 90) * PI / 180));
      lines[i].ye = screenHdiv2 - (1 * sin((i + hAdd) * PI / 180));
    
      //delay(500);
    
      //Serial.println( sin((i + 90) * PI / 180)); 
      tft.drawLine(lines[i].xa, lines[i].ya, lines[i].xe, lines[i].ye, ILI9341_WHITE);
  
      //delay(500);
    }
  
}