processing.js

Draw a circle at the mouse position

by uto usui

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.2/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.2/js/bootstrap.min.js"></script>
<div class="wrap">
	<h1>processing.js</h1>
	<p class="lead">Draw a circle at the mouse position</p>
	<canvas id="myCanvas"></canvas>
</div>
<link href="https://fonts.googleapis.com/css?family=Dancing+Script:400,700" rel="stylesheet">

SCSS

body {
	display: flex;
	justify-content: center;
	align-items: center;
	width: 100%;
	min-height: 100vh;
  padding: 1em;
	font-family: 'Dancing Script';
	text-align: center;
  background-image: linear-gradient(-30deg,#f7cac9 20%,#91A8d0 85%);
}

h1 {
	font-size: 42px;
	font-weight: bold;
	color: #32355a;
}

canvas {
	margin: 20px auto;
	border: 3px dashed rgba(#32355a, .55);
  background-color: rgba(white, .15);
}

JavaScript

</script>
<script type="application/processing" data-processing-target="myCanvas">


void setup() {
  size(320, 320);
  colorMode(HSB,360,100,100,100);
  noStroke();
  background(320);
}

void draw() {
	float randColor = random(170, 220);
	fill(randColor,60,80,10);
	// mouseX マウスのx座標
	// mouseY マウスのy座標
  ellipse(mouseX, mouseY, 60, 60);
}

// マウスボタンを押すと実行
void mousePressed() {
   background(200);
}

// マウスボタンが離されると実行
void mouseReleased() {
  background(320);
}