Author: xmf

The project is representing two events we had to deal with in 2020, the so-called Asian murder hornets and the coronavirus.
The project is a game that mimics arcade-style 2D shooter games.
The player is a hornet facing off against cells of the coronavirus and taking them down with glowing green bullets.
Whenever a virus reaches the bottom of the screen, the player loses.

While developing this project, I came across a lot of problems , the most complicated being the interaction between the bullet and virus.
I was not sure how to call a property of an object in an array while comparing it to another property of an object in another array and then making something happen with it.
However, I ended up using a nested for loop to linear search both the virus and bullet and using a conditional to check if the x and y value of those searched are matching.

Creating a project for myself and implementing the coding strategies I’ve learned over this semester definitely cemented what I’ve learned and see the usage of these techniques in my own way.
Overall, I learned about my strength and weaknesses when tackling a coding project through this experience.

sketch

var movement = []
var bullets = [];
var xpos;
var ypos;
var cv;
var score;
var c=0
var virus = [];
var cvimage = [];
var cvlinks = [
"https://i.imgur.com/Nw3KzRI.png", // virus images
"https://i.imgur.com/JlYsbHq.png",
"https://i.imgur.com/rIXhNzt.png",
"https://i.imgur.com/SjJmecC.png"
]
var count = 0;

function preload(){
  for (var i = 0; i<4; i++){ // loading images into array
    cvimage[i] = loadImage(cvlinks[i]);
  }
  hornet = loadImage("https://i.imgur.com/tU0dXCU.png")
  hornetshadow = loadImage("https://i.imgur.com/JErLPWR.png")
}
function setup() {
    createCanvas(500, 500);
    for (var i = 0; i < 100; i++){ // initial background lines
        var rx = random(width);
        var ry = random(height);
        movement[i] = makemovement(rx,ry);
    }
}
function draw() {
    background(255)
    startgame();
    updatemovement();
    removemovement();
    addmovement();
    updatevirus();
    addvirus();
    removevirus();
    drawhornet();
    updateremovebullet();
    bulletvirusinteraction();
    lose();
    count++
}

function startgame(){ // openning of game
  push()
  translate(width/2,height/2)
  fill(0)
  scale(c)
  circle(0,0,5)
  c+=2
  pop()
}
// BACKGROUND MOVEMENT
function updatemovement(){
    for (var i = 0; i < movement.length; i++){ //background lines appearing and moving
        movement[i].move(); //moving
        movement[i].display(); // appearing
    }
}
function removemovement(){
    var movementtokeep = []; // array to keep existing lines
    for (var i = 0; i < movement.length; i++){ //going through lines to see which to keep
        if (movement[i].y + 100 < 500) {
            movementtokeep.push(movement[i]);
        }
    }
    movement = movementtokeep; //return kept lines back inot movement array
}
function addmovement() {
      for (var i = 0; i < 100; i++){ // adding more background lines
          var rx = random(width);
          var ry = random(height);
          movement.push(makemovement(0))
          movement[i] = makemovement(rx,ry);
      }
}
function mvmtMove() {
    this.y += this.speed; // lines movement down canvas
}
function mvmtDisplay() { // white lines
    stroke(255);
    line(this.x,this.y,this.x,this.y+100);
}
function makemovement(startx,starty) { //properties of background object
    var mvmt = {x: startx,
                y: starty,
                speed: 1,
                move: mvmtMove,
                display: mvmtDisplay}
    return mvmt;
}
function drawhornet(){
    xpos=constrain(mouseX,0,width-50); // keep hornet in canvas
    ypos=map(mouseY,0,height,350,450);// keep hornet in bottom portion of the canvas
    image(hornet,xpos,ypos,50,50); // draw hornet
}

// VIRUS

function updatevirus(){
    for (var i = 0; i < virus.length; i++){ // showing and mocing viruses
        virus[i].move();
        virus[i].display();
    }
}
function addvirus() { // creating a new row of virus
    if (count % 100 == 0){
      for (var i = 0; i < 4; i++){
          virus.push(makecv(int(random(10))*50)); // x position of virus is at mulitples of 50
      }
    }
}
function removevirus(){ // if virus is less than height of canvas the virus is kept
    var viruskeep = [];
    for (var i = 0; i < virus.length; i++){
        if (virus[i].y < height) {
            viruskeep.push(virus[i]);
        }
    }
    virus=viruskeep
}
function makecv(startx) { // object propeties of virus with x value being varied from loop from before
    var virus = {x:startx,
                y: -100,
                speed:.5,
                img: random(cvimage),
                move: virusmove,
                display: virusdisplay}
    return virus;
}
function virusmove() { // virus movement
    this.y += this.speed;
}
function virusdisplay() {// show virus
    image(this.img,this.x,this.y,50,50);
}

//BULLET

function mousePressed(){ // when mouse is pressed a new bullet is generated
      var startingbullet = makebullet(xpos, ypos);
      bullets.push(startingbullet);
}
function updateremovebullet(){ //move and show bullet while keeping if under 150 counts to keep array short
  newbullets = [];
  for (var i = 0; i < bullets.length; i++) {
      var b = bullets[i];
      b.stepFunction();
      b.drawFunction();
      if (b.age < 150) {
          newbullets.push(b);
      }
  }
  bullets = newbullets; // kept bullets back into bullets array
}
function bulletmove() { // bullet movement
    this.y -= this.dy;
    this.age ++
  }
function bulletdisplay() { // glowing green bullets
    fill(0,200,0)
    ellipse(this.x,this.y,10)
    fill(0,255,0)
    ellipse(this.x,this.y,5)
}
function makebullet(bulletx, bullety) { // bullet object properties
    b = {x: bulletx,
         y: bullety,
         dy: 4,
         age: 0,
         stepFunction: bulletmove,
         drawFunction: bulletdisplay
        }
    return b;
}
function bulletvirusinteraction (){
  for (var i= virus.length-1;i >0; i--) { // linear search virus backwards so when spliced it doesnt skip one
    for (var j= bullets.length-1;j >0; j--) { // linear search bullets
      if ((bullets[j].x <= virus[i].x+50) // range of bullet and virus x values must match
        & (bullets[j].x >= virus[i].x-50)
        && (bullets[j].y <= virus[i].y+25)){ // range of bullet and virus y values must match
      virus.splice(i,1); //if they match then both bullet and virus disappear from the array
      bullets.splice(j,1);
      }
    }
  }
}
function lose (){
    for (var i= 0 ;i < virus.length; i++) {
      if ( virus[i].y==450){ // if any virus' y value passes 450 then player loses
        gameover(); // trigger gameover screen
      }
    }
}
function gameover (){
  fill(255,0,0);
  rect(0,0,500,500);
  noStroke();
  fill(0);
  textSize(50);
  text('GAME OVER',100, height/2);
  textSize(20);
  frameRate(0); // end frame
}