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

#define TFT_SCK 7
#define TFT_MOSI 11
#define MISO 9
#define TFT_CS   12
#define TFT_DC   14
#define TFT_RST  8

Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);

void drawColorGradientSquare();
int colorRangeMap(int value, int in_min, int in_max, int out_min, int out_max);
void displayColorSquareGrid();
void displayColorTriangles();
void drawCircles();
void writeDiagonally();

void setup() {
  Serial.begin(115200);
  delay(500);
  delay(1000);

  // Initialize the TFT display
  tft.begin();
  tft.setRotation(3); // Adjust the rotation if necessary
}

void loop() {
  // Display color square grid and triangles
  drawColorGradientSquare();
  delay(5000);  // Pause for 5 seconds
  tft.fillScreen(ILI9341_BLACK);  // Clear the screen

  displayColorSquareGrid();
  delay(2500);  // Pause for 2.5 seconds
  tft.fillScreen(ILI9341_BLACK);  // Clear the screen

  displayColorTriangles();
  delay(2000);  // Pause for 2 seconds
  tft.fillScreen(ILI9341_BLACK);  // Clear the screen

  // Draw the circles in rainbow colors
  drawCircles();

  // Write diagonally with yellow color and font size 3 by Arvind
  writeDiagonally();
}

void drawColorGradientSquare() {
  int centerX = 120;
  int centerY = 160;
  int initialSize = 120;
  int sizeStep = 10;

  // Draw the square with reducing size using interpolated colors
  for (int size = initialSize; size > 0; size -= sizeStep) {
    int halfSize = size / 2;

    for (int x = centerX - halfSize; x <= centerX + halfSize; x++) {
      for (int y = centerY - halfSize; y <= centerY + halfSize; y++) {
        int distanceX = abs(x - centerX);
        int distanceY = abs(y - centerY);
        int maxDistance = max(distanceX, distanceY);

        int color = colorRangeMap(maxDistance, 0, halfSize, ILI9341_RED, ILI9341_BLUE);

        tft.drawPixel(x, y, color);
      }
    }
  }
}

int colorRangeMap(int value, int in_min, int in_max, int out_min, int out_max) {
  return (value - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}

void displayColorSquareGrid() {
  int side = 150;  // Initial side length of the square
  int spacing = 10;  // Spacing between squares

  for (int i = 0; i < 10; ++i) {
    uint16_t color = tft.color565(i * 20, i * 10, 255 - i * 15);  // Generate a gradient color
    tft.fillRect(10 + i * spacing, 10 + i * spacing, side, side, color);
    side -= 5;  // Reduce side length by 5 pixels for the next square

    delay(2500);
  }
}

void displayColorTriangles() {
  int side = 240;  // Initial side length of the triangle
  int spacing = 30;  // Spacing between triangles

  for (int i = 0; i < 10; ++i) {
    uint16_t color = tft.color565(i * 20, 255 - i * 10, i * 15);  // Generate a gradient color
    int x0 = 80 + i * spacing;
    int y0 = 30 + i * spacing;
    int x1 = 140 + i * spacing;
    int y1 = 70 + i * spacing;
    int x2 = 40 + i * spacing;
    int y2 = 70 + i * spacing;
    tft.fillTriangle(x0, y0, x1, y1, x2, y2, color);
    side -= 5;  // Reduce side length by 5 pixels for the next triangle
    delay(2000);
  }
}

void drawCircles() {
  // Define an array of colors for the rainbow
  uint16_t colors[] = {ILI9341_RED, ILI9341_ORANGE, ILI9341_YELLOW, ILI9341_GREEN, ILI9341_BLUE, ILI9341_INVCTR, ILI9341_CASET};

  // Define the coordinates of the circle center
  int x = tft.width() / 2;
  int y = tft.height() / 2;

  // Define the initial diameter of the circle
  int dia = 200;

  // Loop through the circle count
  for (int i = 0; i < 7; i++) {
    // Draw the circle with the corresponding color
    tft.fillCircle(x, y, dia / 2, colors[i]);

    delay(2000);    // Reduce the diameter by 25 pixels
    dia -= 25;
  }
}

void writeDiagonally() {
  // Set the text color to yellow
  tft.setTextColor(ILI9341_YELLOW);

  // Set the text size to 3
  tft.setTextSize(3);

  // Define the initial coordinates of the text
  int x = 40;
  int y = 60;

  // Define the text to write
  char text[] = "by Arvind";

  // Loop through the characters of the text
  for (int i = 0; i < strlen(text); i++) {
    // Write the character at the current position
    tft.write(text[i]);

    // Move the cursor diagonally by 20 pixels
    x += 20;
    y += 20;

    // Set the cursor to the new position
    tft.setCursor(x, y);
  }
}