float angle, a, b, c, d, xco, yco;    // Declaring variables
boolean throwvar, start, started;
PVector gravity, launch, sum;
String[] tex = new String[4];

void setup()
{
 background(255, 255, 255);    // Setting up backgroung, line width, and screen size
 strokeWeight(5);
 size(500, 500);
 throwvar = false;    // Initializing some important variables
 angle = 0;
}

void draw()
{
 background(255, 255, 255);    // Clearing the screen
 rect(50, 425, 400, 25);    // Power bar (outline part)
 fill(200, 255, 200);    // Making non-outline portion of power bar green
 rect(50, 425, 400*(d/10), 25);    // Power bar (non-outline part)
 noFill();    // Reversing color change
 rotate(angle);    // Rotating gun/aimer based on user-inputted angle
 line(0, 0, 0, -50);    // Making gun/aimer
 start = true;    // Telling the next "if" that the first frame has already occurred
 if(start && !started) {    // If statement to rotate aimer to 45 degrees on the first frame
   angle += PI*0.75;    // Indirect rotation
   started = true;    // Making this if statement invalid for subsequent executions of draw
 }
 if(throwvar && xco < 500 && yco > -500) {    // If statement to launch pellet/bullet (also prevents pellet from going off screen)
   gravity = new PVector(a, PI);    // Initializing vectors
   launch = new PVector(d, angle);
   sum = PVector.add(gravity, launch);
   xco = sum.x*cos(sum.y);    // Converting the vectors (polar) to x/y coordinates
   yco = sum.x*sin(sum.y);
   tex[0] = str(xco);    // Debug stuff
   tex[1] = str(yco);
   tex[2] = str(mouseX);
   tex[3] = str(mouseY);
   println(join(tex, ", "));
   point(xco, yco);    // Drawing bullet
   a += 0.98;    // Increasing velocity downwards (gravity is acceleration)
   if(d >= 0) {    // Making bullet speed decay over time
     d -= 0.1;
   }
 }
 if(xco >= 500 && yco <= -500) {    // Resetting program when pellet hits the edge of screen
   a = 0;
   d = 0;
   throwvar = false;
 }
}

void keyPressed()    // Stuff to make aimer change angle when you pres arrow keys as well as firing machanism
{
 if(key == CODED && !throwvar) {
   if(keyCode == UP && angle > PI/2) {
     angle -= 0.01;
   }
   if(keyCode == DOWN && angle < PI) {
     angle += 0.01;
   }
 }
 if((key == ENTER || key == RETURN) && d < 10) {
   d += 0.1;
 }
}

void keyReleased()    // Pretty self explanatory
{
 if(key == ENTER || key == RETURN) {
   throwvar = true;
 }
 else if(key == BACKSPACE || key == DELETE) {
   throwvar = false;
 }
}

float angle, a, b, c, d, xco, yco, launchcompx, launchcompy, gravitycompx, gravitycompy;    // Declaring variables
boolean throwvar, bar, launched;
PVector gravity, launch;
int state = 1;

void setup()
{
  background(255, 255, 255);    // Setting up background, line width, and screen size
  strokeWeight(5);
  size(500, 500);
  throwvar = false;    // Initializing some important variables
  angle = 0;
}

void draw()
{
  background(255, 255, 255);    // Clearing the screen
  if(launched)
  {
    c = d;
    launch = new PVector(c, angle);
    launched = false;
  }
  rect(50, 425, 400, 25);    // Power bar (outline part)
  rotate(angle);    // Rotating gun/aimer based on user-inputted angle
  line(0, 0, 0, -50);    // Making gun/aimer
  switch(state)
  {
  case 1:
    if(!throwvar)
    {
      angle = atan2(mouseY, mouseX)+(PI/2);
      b = d;
      fill(200, 255, 200);
      rect(50, 425, 400*(d/10), 25);
      noFill();
    } else {
      gravity = new PVector(a, PI+PI/2);
      launchcompx = launch.x*cos(launch.y);
      launchcompy = launch.x*sin(launch.y);
      gravitycompx = gravity.x*cos(gravity.y);
      gravitycompy = gravity.x*sin(gravity.y);
      xco = gravitycompx + launchcompx;
      yco = gravitycompy + launchcompy;
      point(xco, yco);    // Drawing bullet
      a += 0.98;
      if(launch.x > 0)
      {
        launch.x -= 0.001;
      }
    }
    state = 2;
    break;
  case 2:
    if(bar && d < 10)
    {
      d += 0.1;
    }
    state = 1;
    break;
  }
}

void mousePressed()    // Stuff to make aimer change angle
  if(mouseButton == LEFT && !throwvar)
  {
    bar = true;
  }
}

void mouseReleased()    // Pretty self explanatory
{
  bar = false;
  if(mouseButton == LEFT) {
    throwvar = true;
    launched = true;
  }
  else if(mouseButton == RIGHT) {
    throwvar = false;
    launched = false;
    launch = null;
    gravity = null;
    a = 0;
    b = 0;
    c = 0;
    d = 0;
    angle = 0;
    launchcompx = 0;
    launchcompy = 0;
    gravitycompx = 0;
    gravitycompy = 0;
    xco = 0;
    yco = 0;
    state = 1;
  }
}