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151 lines
4.3 KiB
JavaScript
151 lines
4.3 KiB
JavaScript
// Kass's Customizable Node/Particles Title
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// settings:
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const canvasName = "did-canvas"
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const maxNodes = 40 // using too many will impact performance.
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const nodeMinSize = 3
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const nodeMaxSize = 4
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const nodeMinSpeed = 0.02
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const nodeMaxSpeed = 0.3
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const nodeMaxConnections = 20
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const connectionThickness = 2;
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const connectionDist = 102
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const connectionColor = "#0f477e"
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const nodeColors = ['#0f477e'] // you may enter multiple colors ["#65c665", "#40a040"]
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const warpEdges = false // if false nodes will bounce off the edges
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const useIcon = false // if false then colored circles will be used
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const iconPath = "https://image.flaticon.com/icons/png/128/137/137068.png"
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const iconScale = 6
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const useTrail = false
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const backgroundColor = "#222222"
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// another example can be found here https://codepen.io/cryptokass/pen/mgbajy?editors=0010
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// canvas reference:
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var canvas = document.getElementById(canvasName)
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var ctx = canvas.getContext('2d')
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// store canvas size:
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let canvasHeight = +getComputedStyle(canvas).getPropertyValue("height").slice(0, -2);
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let canvasWidth = +getComputedStyle(canvas).getPropertyValue("width").slice(0, -2);
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canvas.height = canvasHeight
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canvas.width = canvasWidth
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// setup image
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var img = new Image()
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img.src = iconPath
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// animation frame compatibility:
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window.requestAnimFrame = function()
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{
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return (
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window.requestAnimationFrame ||
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window.webkitRequestAnimationFrame ||
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window.mozRequestAnimationFrame ||
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window.oRequestAnimationFrame ||
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window.msRequestAnimationFrame ||
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function(callback) { window.setTimeout(callback, 1000 / 60) }
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);
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}();
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// node class
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function Node(){
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this.size = nodeMinSize + Math.random() * (nodeMaxSize-nodeMinSize)
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this.x = canvasWidth * Math.random()
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this.y = canvasHeight * Math.random()
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this.color = nodeColors[Math.floor(Math.random()*nodeColors.length)]
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this.connections = 0
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// calculate starting velocity
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let speed = nodeMinSpeed + Math.random() * (nodeMaxSpeed-nodeMinSpeed)
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let theta = Math.random() * Math.PI * 2
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this.velocity = {x:speed * Math.sin(theta), y:speed * Math.cos(theta)}
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// move this node
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this.move = function(){
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if (this.x + this.velocity.x >= canvas.width || this.x + this.velocity.x <= 0){
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if (warpEdges){
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this.x = (this.x + this.velocity.x >= canvas.width ) ? 0 : canvas.width
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} else {
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this.velocity.x = -this.velocity.x
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}
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}
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if (this.y + this.velocity.y >= canvas.height || this.y + this.velocity.y <= 0)
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{
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if (warpEdges) {
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this.y = (this.y + this.velocity.y >= canvas.height ) ? 0 : canvas.height
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} else {
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this.velocity.y = -this.velocity.y
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}
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}
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this.x += this.velocity.x
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this.y += this.velocity.y
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this.connections = 0
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}
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// draw this nodes connections
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this.drawConnections = function(index){
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for (let i=index+1; i < nodes.length; i++){
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let node = nodes[i]
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let dist = Math.sqrt(Math.pow(this.x - node.x,2) + Math.pow(this.y - node.y,2))
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if (dist < connectionDist && node.connections < nodeMaxConnections && this.connections < nodeMaxConnections){
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ctx.globalAlpha = 1-dist/connectionDist
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ctx.beginPath()
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ctx.moveTo(this.x,this.y)
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ctx.lineTo(node.x, node.y)
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ctx.lineWidth = connectionThickness
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ctx.strokeStyle = connectionColor
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ctx.stroke()
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ctx.closePath()
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node.connections++
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this.connections++
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}
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}
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}
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this.draw = function(){
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ctx.globalAlpha = 1
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if (useIcon){
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let _size = this.size * iconScale
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let dx = this.x - _size/2
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let dy = this.y - _size/2
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ctx.drawImage(img, dx, dy, _size, _size)
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}else{
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ctx.beginPath()
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ctx.arc(this.x, this.y, this.size, 0, Math.PI * 2)
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ctx.fillStyle = this.color
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ctx.fill()
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ctx.closePath()
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}
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}
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}
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var nodes = []
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for (let i=0; i < maxNodes; i++){
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var node = new Node()
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nodes.push(node)
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}
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function tick(){
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if (useTrail){
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ctx.globalAlpha = 0.1
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ctx.rect(0,0,canvas.width, canvas.height)
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ctx.fillStyle = backgroundColor
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ctx.fill()
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}else{
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ctx.clearRect(0, 0, canvas.width, canvas.height)
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}
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for (let i=0; i < maxNodes; i++){
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nodes[i].drawConnections(i)
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}
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for (let i=0; i < maxNodes; i++){
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nodes[i].draw()
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nodes[i].move()
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}
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requestAnimFrame(tick);
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}
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requestAnimFrame(tick); |