​

let drawline = false;

let strong = 1.0;

let wind = 5.0;

let winddir = 0.0;

let Red = 100;

let Grn = 100;

let Blu = 100;

​

function print_help(){

    print("click and drag to start draw lines ");

    print("use mouse wheel for line width");

    print("use Arrow UP DOWN for wind speed");

    print("use Arrow LEFT RIGHT for wind direction");

  print("use SHIFT for Eraser");

    print("key [r] [g] [b] and mouse wheel for color");

    print("use key [c] for clear, key [x] reset");

    print("status:"); 

    print(" wind:"+wind+" winddir: "+winddir+" line width: "+strong);

  print(" Red: "+Red+" Green: "+Grn+" Blue: "+Blu);

}

​

function setup() {

    createCanvas(500, 500);

    colorMode(RGB, 100);

    background(0);

    stroke(255);

    print_help();

}

​

function draw() {

    strokeWeight(strong);

    stroke(Red,Grn,Blu);

    if ( keyIsPressed && keyCode === SHIFT ) stroke(0);  // Eraser

    if (drawline) line(mouseX, mouseY, mouseX + wind * sin(winddir / TWO_PI), mouseY + wind * cos(winddir / TWO_PI));

}

​

function mouseDragged() {

    drawline = true;

}

​

function mouseReleased() {

    drawline = false;

}

​

function mouseWheel(event) {

    if (keyIsPressed) {

        if (key === 'r') {

            Red += event.delta; Red = constrain(Red,0,100);

            print("Red: " + nf(Red, 1, 1));

        } else

        if (key === 'g') {

            Grn += event.delta; Grn = constrain(Grn,0,100);

            print("Green: " + nf(Grn, 1, 1));

        } else

        if (key === 'b') {

            Blu += event.delta; Blu = constrain(Blu,0,100);

            print("Blue: " + nf(Blu, 1, 1));

        }

    } else {

        strong += event.delta / 10.0;

        if (strong < 0) strong = 1.0;

        print("line weight: " + nf(strong, 1, 1));

    }

    return false;

}

​

​

function keyReleased() {

    if (keyCode === UP_ARROW) {

        wind++;

        print("new wind: " + wind);

    }

​

    if (keyCode === DOWN_ARROW) {

        wind--;

        print("new wind: " + wind);

    }

    if (keyCode === LEFT_ARROW) {

        winddir--;

        print("new winddir: " + winddir);

    }

    if (keyCode === RIGHT_ARROW) {

        winddir++;

        print("new winddir: " + winddir);

    }

​

    if (key === 'c') {     // clear

        background(0);

    }

    if (key === 'x') {     // reset

        Red = 100; Grn = 100; Blu = 100; wind = 5; winddir = 0; strong = 1;

        print("reset");

    }

​

​

}