#include <raylib.h>
#include <raymath.h>
#include <cmath>
#include <vector>

float len = 300;
float angleD = 100;
float angleR = (angleD * PI) / 180; // radian
Vector2 start = {250, 400};
Vector2 end = {250, start.y - len};
Vector2 end_kot = {};
float radius = 20;
float radiusS = 80;
float radiusE = 60;
Color colorS = RED;
Color colorE = GREEN;

typedef void (*slika)();

Vector2 tstart = {10, 10};
int tsize = 30;

int idx = 0;

std::vector<slika> v_slik = {
    []()
    {
      DrawText("Zacetna tocka", tstart.x, tstart.y, tsize, BLACK);
      DrawCircleV(start, radius, BLACK);
    },

    []()
    {
      DrawText("Dolzina", tstart.x, tstart.y, tsize, BLACK);
      DrawCircleV(start, radius, BLACK);
      DrawLineEx(start, end, 10, BLACK);
    },

    []()
    {
      DrawText("Kot in Koncna tocka", tstart.x, tstart.y, tsize, BLACK);
      DrawCircleV(start, radius, BLACK);
      DrawLineEx(start, end_kot, 10, BLACK);
      DrawCircleV(end_kot, radius, BLACK);
      DrawCircleSectorLines(start, len / 3, 360 - angleD, 360, 30, BLACK);
    },

    []()
    {
      DrawText("Zacetna debelina", tstart.x, tstart.y, tsize, BLACK);
      DrawCircleV(start, radius, BLACK);
      DrawLineEx(start, end_kot, 10, BLACK);
      DrawCircleV(end_kot, radius, BLACK);
      DrawCircleLinesV(start, radiusS, BLACK);
    },
   
    []()
    {
      DrawText("Koncna debelina", tstart.x, tstart.y, tsize, BLACK);
      DrawCircleV(start, radius, BLACK);
      DrawLineEx(start, end_kot, 10, BLACK);
      DrawCircleV(end_kot, radius, BLACK);
      DrawCircleLinesV(start, radiusS, BLACK);
      DrawCircleLinesV(end_kot, radiusE, BLACK);
    },

    []()
    {
      DrawText("Zacetna barva", tstart.x, tstart.y, tsize, BLACK);
      DrawLineEx(start, end_kot, 10, BLACK);
      DrawCircleV(end_kot, radius, BLACK);
      DrawCircleV(start, radiusS, colorS);
      DrawCircleLinesV(end_kot, radiusE, BLACK);
    },

    []()
    {
      DrawText("Koncna barva", tstart.x, tstart.y, tsize, BLACK);
      DrawLineEx(start, end_kot, 10, BLACK);
      DrawCircleV(start, radiusS, colorS);
      DrawCircleV(end_kot, radiusE, colorE);
    },

    []()
    {
      DrawText("Veja", tstart.x, tstart.y, tsize, BLACK);
      float fstep = 0.05;
      for (float i = 0; i < 1.05; i += fstep)
      {
        Vector2 point = Vector2Lerp(start, end_kot, i);
        Color color = ColorLerp(colorS, colorE, i);
        int size = Lerp(radiusS, radiusE, i);
        DrawCircleV(point, size, color);
      }
    }

  };

int main(int argc, char *argv[])
{
  int screenWidth = 500;
  int screenHeight = 500;

  float ny = len * sin(angleR);
  float nx = len * cos(angleR);
  end_kot.x = start.x + nx;
  end_kot.y = start.y - ny;

  InitWindow(screenWidth, screenHeight, "Slike");
  SetTargetFPS(60);

  while (!WindowShouldClose())
  {
    BeginDrawing();
    if (IsKeyPressed(KEY_S))
    {
      TakeScreenshot(TextFormat("slika%.2d.png", idx));
    }
    if (IsKeyPressed(KEY_N))
    {
      idx++;
      if (idx >= v_slik.size())
        idx = v_slik.size() - 1;
    }
    if (IsKeyPressed(KEY_P))
    {
      idx--;
      if (idx < 0)
        idx = 0;
    }
    ClearBackground(WHITE);
    v_slik[idx]();
  
    EndDrawing();
  }


  CloseWindow();
  return 0;
}