SI13/PRACTICAL_VISION/scripts/visions.js

const app = new PIXI.Application({ transparent: true,  width: innerWidth, height: innerHeight});
document.body.appendChild(app.view);


// holder to store the aliens
const aliens = [];

const totalDudes = 25;

for (let i = 0; i < totalDudes; i++) {
    // create a new Sprite that uses the image name that we just generated as its source
    const dude = PIXI.Sprite.from('../assets/practical2.png');

    // set the anchor point so the texture is centerd on the sprite
    // dude.anchor.set();

    // set a random scale for the dude - no point them all being the same size!
    dude.scale.set( 0.03 + Math.random() * 0.8);

    // finally lets set the dude to be at a random position..
    dude.x = Math.random() * app.screen.width;
    dude.y = Math.random() * app.screen.height;

   // dude.tint = 0xFF00FF;

    // create some extra properties that will control movement :
    // create a random direction in radians. This is a number between 0 and PI*2 which is the equivalent of 0 - 360 degrees
    dude.direction = Math.random() * Math.PI * 2;

    // this number will be used to modify the direction of the dude over time
    dude.turningSpeed = Math.random() ;

    // create a random speed for the dude between 2 - 4
    dude.speed = 2 + Math.random();

    // finally we push the dude into the aliens array so it it can be easily accessed later
    aliens.push(dude);

    app.stage.addChild(dude);
}

// create a bounding box for the little dudes
const dudeBoundsPadding = 1;
const dudeBounds = new PIXI.Rectangle(-dudeBoundsPadding,
    -dudeBoundsPadding,
    app.screen.width + dudeBoundsPadding * 2,
    app.screen.height + dudeBoundsPadding * 5);

app.ticker.add(() => {
    // iterate through the dudes and update their position
    for (let i = 0; i < aliens.length; i++) {
        const dude = aliens[i];
        dude.direction += dude.turningSpeed * 0.03;
        dude.x += Math.sin(dude.direction) * dude.direction;
        dude.y += Math.cos(dude.direction) * dude.speed *0.2;
        dude.rotation = dude.direction - Math.PI * 0.3;

        // wrap the dudes by testing their bounds...
        if (dude.x < dudeBounds.x) {
            dude.x += dudeBounds.width;
        } else if (dude.x > dudeBounds.x + dudeBounds.width) {
            dude.x -= dudeBounds.width;
        }

        // if (dude.y < dudeBounds.y) {
        //     dude.y += dudeBounds.height;
        // } else if (dude.y > dudeBounds.y + dudeBounds.height) {
        //     dude.y -= dudeBounds.height;
        // }
    }
});
const style = new PIXI.TextStyle({
    fill: [
        "#00f900",
        "#00f900"
    ],
    fontFamily: "Arial Black"
});
const text = new PIXI.Text('QUESTO E\' LA PROVA', style);