## DEV Community

sarah_ldp

Posted on • Originally published at dirask.com

# JavaScript and animated sinus in console 🙂💻

Hello everyone 🙂

PS: This is my first post here, so be forgiving 🙂

Today I'd like to share with you simple but effective way of using mathematical sinus to make funny animation in console with my favourite JavaScript.

Do you have smarter or better way of doing similar example? Any suggestion is appreciated, thanks in advance. 👍

I hope someone will get inspired by this post and will create something even more creative.

This post was originally published at:
JavaScript and animated sinus in console

All code examples can be run with online runner under link:
code examples with online runner

# 1. Smile sine animation example

``````function printSine(x1, x2) {
var dx = 3.14 / 4.0; // x axis step
var dy = 1.0  / 5.0; // y axis step

function printLine(character) {
var line = '';

for(var y = y1; y < y2; y += dy) {
line += '.';
}

console.log(line + character);
}

var y1 = 0.0;
var y2 = Math.sin(rad) + 1;

printLine('😃');
}
}

var x1 = 0.0;     // begining of sinus chart
var x2 = 6 * 3.14 // end of sinus chart

setInterval(function() {
console.clear();
printSine(x1, x2);

x1 += 0.3;
x2 += 0.3;

}, 40);
``````

# 2. Crazy fast

``````function printSine(x1, x2) {
var dx = 3.14 / 4.0; // x axis step
var dy = 1.0  / 5.0; // y axis step

function printLine() {
var line = '';

for(var i = 0; i < arguments.length; ++i) {
var character = arguments[i];

for(var y = y1; y < y2; y += dy) {
line += ' ';
}

line += character;
line+= '                 ';

for(var y = y2; y < 1.0; y += dy) {
line += ' ';
}
}

console.log(line);
}

var y1 = 0.0;
var y2 = Math.sin(rad) + 1;

printLine('😃', '😃');
}
}

var x1 = 0.0;     // begining of sinus chart
var x2 = 6 * 3.14 // end of sinus chart

setInterval(function() {
console.clear();
printSine(x1, x2);

x1 += 0.3;
x2 += 0.3;

}, 4);
``````

# 3. Custom sine animation example

``````function printSine(x1, x2) {
var dx = 3.14 / 4.0; // x axis step
var dy = 1.0  / 5.0; // y axis step

var y1 = 0.0;
var y2 = Math.sin(rad) + 1;

var line = '';

for(var y = y1; y < y2; y += dy) {
line += ' ';
}

console.log(line + '+');
}
}

var x1 = 0.0;     // begining of sinus chart
var x2 = 6 * 3.14 // end of sinus chart

setInterval(function() {
console.clear();
printSine(x1, x2);

x1 += 0.3;
x2 += 0.3;

}, 50);
``````

# 4. Funny smiled sine example

``````function printSine(x1, x2) {
var dx = 3.14 / 4.0; // x axis step
var dy = 1.0  / 5.0; // y axis step

function printLine(character) {
var line = '';

for(var y = y1; y < y2; y += dy) {
line += ' ';
}

console.log(line + character);
}

var y1 = 0.0;
var y2 = Math.sin(rad) + 1;

printLine('*');
}

printLine('😃');
}

var x1 = 0.0;     // begining of sinus chart
var x2 = 6 * 3.14 // end of sinus chart

setInterval(function() {
console.clear();
printSine(x1, x2);

x1 += 0.3;
x2 += 0.3;

}, 50);
``````

So, that's all for today, I hope you enjoyed this short post, leave a comment with improvement suggestions or any thoughts.

Thanks, be well and see you soon in my next post. 👍 🙂