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| Line 1: |
Line 1: |
| − | var canvas = document.getElementById('nokey'),
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| − | can_w = parseInt(canvas.getAttribute('width')),
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| − | can_h = parseInt(canvas.getAttribute('height')),
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| − | ctx = canvas.getContext('2d');
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| | | | |
| − | // console.log(typeof can_w);
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| − |
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| − | var ball = {
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| − | x: 0,
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| − | y: 0,
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| − | vx: 0,
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| − | vy: 0,
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| − | r: 0,
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| − | alpha: 1,
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| − | phase: 0
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| − | },
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| − | ball_color = {
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| − | r: 207,
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| − | g: 255,
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| − | b: 4
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| − | },
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| − | R = 2,
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| − | balls = [],
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| − | alpha_f = 0.03,
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| − | alpha_phase = 0,
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| − |
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| − | // Line
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| − | link_line_width = 0.8,
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| − | dis_limit = 260,
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| − | add_mouse_point = true,
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| − | mouse_in = false,
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| − | mouse_ball = {
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| − | x: 0,
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| − | y: 0,
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| − | vx: 0,
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| − | vy: 0,
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| − | r: 0,
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| − | type: 'mouse'
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| − | };
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| − |
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| − | // Random speed
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| − | function getRandomSpeed(pos){
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| − | var min = -1,
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| − | max = 1;
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| − | switch(pos){
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| − | case 'top':
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| − | return [randomNumFrom(min, max), randomNumFrom(0.1, max)];
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| − | break;
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| − | case 'right':
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| − | return [randomNumFrom(min, -0.1), randomNumFrom(min, max)];
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| − | break;
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| − | case 'bottom':
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| − | return [randomNumFrom(min, max), randomNumFrom(min, -0.1)];
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| − | break;
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| − | case 'left':
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| − | return [randomNumFrom(0.1, max), randomNumFrom(min, max)];
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| − | break;
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| − | default:
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| − | return;
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| − | break;
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| − | }
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| − | }
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| − | function randomArrayItem(arr){
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| − | return arr[Math.floor(Math.random() * arr.length)];
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| − | }
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| − | function randomNumFrom(min, max){
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| − | return Math.random()*(max - min) + min;
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| − | }
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| − | console.log(randomNumFrom(0, 10));
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| − | // Random Ball
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| − | function getRandomBall(){
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| − | var pos = randomArrayItem(['top', 'right', 'bottom', 'left']);
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| − | switch(pos){
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| − | case 'top':
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| − | return {
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| − | x: randomSidePos(can_w),
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| − | y: -R,
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| − | vx: getRandomSpeed('top')[0],
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| − | vy: getRandomSpeed('top')[1],
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| − | r: R,
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| − | alpha: 1,
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| − | phase: randomNumFrom(0, 10)
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| − | }
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| − | break;
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| − | case 'right':
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| − | return {
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| − | x: can_w + R,
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| − | y: randomSidePos(can_h),
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| − | vx: getRandomSpeed('right')[0],
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| − | vy: getRandomSpeed('right')[1],
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| − | r: R,
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| − | alpha: 1,
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| − | phase: randomNumFrom(0, 10)
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| − | }
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| − | break;
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| − | case 'bottom':
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| − | return {
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| − | x: randomSidePos(can_w),
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| − | y: can_h + R,
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| − | vx: getRandomSpeed('bottom')[0],
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| − | vy: getRandomSpeed('bottom')[1],
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| − | r: R,
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| − | alpha: 1,
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| − | phase: randomNumFrom(0, 10)
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| − | }
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| − | break;
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| − | case 'left':
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| − | return {
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| − | x: -R,
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| − | y: randomSidePos(can_h),
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| − | vx: getRandomSpeed('left')[0],
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| − | vy: getRandomSpeed('left')[1],
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| − | r: R,
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| − | alpha: 1,
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| − | phase: randomNumFrom(0, 10)
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| − | }
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| − | break;
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| − | }
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| − | }
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| − | function randomSidePos(length){
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| − | return Math.ceil(Math.random() * length);
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| − | }
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| − |
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| − | // Draw Ball
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| − | function renderBalls(){
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| − | Array.prototype.forEach.call(balls, function(b){
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| − | if(!b.hasOwnProperty('type')){
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| − | ctx.fillStyle = 'rgba('+ball_color.r+','+ball_color.g+','+ball_color.b+','+b.alpha+')';
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| − | ctx.beginPath();
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| − | ctx.arc(b.x, b.y, R, 0, Math.PI*2, true);
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| − | ctx.closePath();
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| − | ctx.fill();
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| − | }
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| − | });
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| − | }
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| − |
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| − | // Update balls
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| − | function updateBalls(){
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| − | var new_balls = [];
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| − | Array.prototype.forEach.call(balls, function(b){
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| − | b.x += b.vx;
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| − | b.y += b.vy;
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| − |
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| − | if(b.x > -(50) && b.x < (can_w+50) && b.y > -(50) && b.y < (can_h+50)){
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| − | new_balls.push(b);
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| − | }
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| − |
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| − | // alpha change
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| − | b.phase += alpha_f;
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| − | b.alpha = Math.abs(Math.cos(b.phase));
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| − | // console.log(b.alpha);
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| − | });
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| − |
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| − | balls = new_balls.slice(0);
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| − | }
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| − |
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| − | // loop alpha
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| − | function loopAlphaInf(){
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| − |
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| − | }
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| − |
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| − | // Draw lines
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| − | function renderLines(){
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| − | var fraction, alpha;
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| − | for (var i = 0; i < balls.length; i++) {
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| − | for (var j = i + 1; j < balls.length; j++) {
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| − |
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| − | fraction = getDisOf(balls[i], balls[j]) / dis_limit;
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| − |
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| − | if(fraction < 1){
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| − | alpha = (1 - fraction).toString();
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| − |
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| − | ctx.strokeStyle = 'rgba(150,150,150,'+alpha+')';
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| − | ctx.lineWidth = link_line_width;
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| − |
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| − | ctx.beginPath();
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| − | ctx.moveTo(balls[i].x, balls[i].y);
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| − | ctx.lineTo(balls[j].x, balls[j].y);
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| − | ctx.stroke();
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| − | ctx.closePath();
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| − | }
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| − | }
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| − | }
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| − | }
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| − |
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| − | // calculate distance between two points
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| − | function getDisOf(b1, b2){
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| − | var delta_x = Math.abs(b1.x - b2.x),
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| − | delta_y = Math.abs(b1.y - b2.y);
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| − |
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| − | return Math.sqrt(delta_x*delta_x + delta_y*delta_y);
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| − | }
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| − |
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| − | // add balls if there a little balls
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| − | function addBallIfy(){
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| − | if(balls.length < 20){
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| − | balls.push(getRandomBall());
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| − | }
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| − | }
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| − |
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| − | // Render
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| − | function render(){
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| − | ctx.clearRect(0, 0, can_w, can_h);
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| − |
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| − | renderBalls();
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| − |
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| − | renderLines();
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| − |
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| − | updateBalls();
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| − |
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| − | addBallIfy();
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| − |
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| − | window.requestAnimationFrame(render);
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| − | }
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| − |
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| − | // Init Balls
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| − | function initBalls(num){
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| − | for(var i = 1; i <= num; i++){
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| − | balls.push({
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| − | x: randomSidePos(can_w),
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| − | y: randomSidePos(can_h),
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| − | vx: getRandomSpeed('top')[0],
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| − | vy: getRandomSpeed('top')[1],
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| − | r: R,
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| − | alpha: 1,
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| − | phase: randomNumFrom(0, 10)
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| − | });
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| − | }
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| − | }
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| − | // Init Canvas
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| − | function initCanvas(){
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| − | canvas.setAttribute('width', window.innerWidth);
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| − | canvas.setAttribute('height', window.innerHeight);
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| − |
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| − | can_w = parseInt(canvas.getAttribute('width'));
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| − | can_h = parseInt(canvas.getAttribute('height'));
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| − | }
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| − | window.addEventListener('resize', function(e){
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| − | console.log('Window Resize...');
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| − | initCanvas();
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| − | });
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| − |
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| − | function goMovie(){
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| − | initCanvas();
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| − | initBalls(20);
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| − | window.requestAnimationFrame(render);
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| − | }
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| − | goMovie();
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| − |
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| − | // Mouse effect
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| − | canvas.addEventListener('mouseenter', function(){
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| − | console.log('mouseenter');
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| − | mouse_in = true;
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| − | balls.push(mouse_ball);
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| − | });
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| − | canvas.addEventListener('mouseleave', function(){
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| − | console.log('mouseleave');
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| − | mouse_in = false;
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| − | var new_balls = [];
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| − | Array.prototype.forEach.call(balls, function(b){
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| − | if(!b.hasOwnProperty('type')){
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| − | new_balls.push(b);
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| − | }
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| − | });
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| − | balls = new_balls.slice(0);
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| − | });
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| − | canvas.addEventListener('mousemove', function(e){
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| − | var e = e || window.event;
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| − | mouse_ball.x = e.pageX;
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| − | mouse_ball.y = e.pageY;
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| − | // console.log(mouse_ball);
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| − | });
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