/
phasebeam.js
executable file
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/
phasebeam.js
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"use strict";
var phasebeam = function(canvasParentNode) {
var $canvas = canvasParentNode.getElementsByTagName('canvas'),
$foreground = $canvas[1],
$background = $canvas[0],
$fctx = $foreground.getContext('2d'),
$bctx = $background.getContext('2d'),
$w = window,
$M = $w.Math;
return {
'animate': function() {
var degree = this.config.angle/360*$M.PI*2,
sina = $M.sin(degree),
cosa = $M.cos(degree),
sinaAbs = $M.abs(sina),
cosaAbs = $M.abs(cosa),
circles = this.items.circles,
lines = this.items.lines,
drawCircle = this.drawCircle,
drawLine = this.drawLine,
circlesLastTime = [],
linesLastTime = [],
w = $w,
drawAnimatedCircles = function(fWidth, fHeight) {
var len = circles.length,
item, x, y, radius, speed, time, lastTime;
while (len > 0) {
len -= 1;
item = circles[len];
time = +new Date();
lastTime = circlesLastTime[len] || time;
circlesLastTime[len] = time;
x = item.x;
y = item.y;
radius = item.radius;
speed = item.speed*(time-lastTime)/100;
if (x > fWidth + radius) {
x = -radius;
} else if (x < -radius) {
x = fWidth + radius;
} else {
x += sina*speed;
}
if (y > fHeight + radius) {
y = -radius;
} else if (y < -radius) {
y = fHeight + radius;
} else {
y -= cosa*speed;
}
item.x = x;
item.y = y;
drawCircle(x, y, radius, item.rgba, item.shadow, item.blur);
}
},
drawAnimatedLines = function(fWidth, fHeight) {
var len = lines.length,
item, x, y, width, speed, endX, endY, time, lastTime;
while (len > 0) {
len -= 1;
item = lines[len];
time = +new Date();
lastTime = linesLastTime[len] || time;
linesLastTime[len] = time;
x = item.x;
y = item.y;
width = item.width;
speed = item.speed*(time-lastTime)/100;
if (x > fWidth + width * sina) {
x = -width * sina;
} else if (x < -width * sina) {
x = fWidth + width * sina;
} else {
x += sina*speed;
}
if (y > fHeight + width * cosa) {
y = -width * cosa;
} else if (y < -width * cosa) {
y = fHeight + width * cosa;
} else {
y -= cosa*speed;
}
item.x = x;
item.y = y;
endX = x+sina*width;
endY = y-cosa*width;
drawLine(x, y, endX, endY, width, item.rgba, item.shadow, item.blur);
}
},
clearCircles = function() {
var len = circles.length,
item, x, y, radius;
while (len > 0) {
len -= 1;
item = circles[len];
x = item.x;
y = item.y;
radius = item.radius;
$fctx.clearRect(x-radius*1.2-1, y-radius*1.2-1, radius*2.4+2, radius*2.4+2);
}
},
clearLines = function() {
var len = lines.length,
item, x, y, width, endX, endY, minX, minY;
while (len > 0) {
len -= 1;
item = lines[len];
x = item.x;
y = item.y;
width = item.width;
endX = x+sina*width;
endY = y-cosa*width;
minX = x < endX ? x : endX;
minY = y < endY ? y : endY;
$fctx.clearRect(minX-cosaAbs*width*0.4, minY-sinaAbs*width*0.4, $M.abs(x-endX)+cosaAbs*width*0.4*2, $M.abs(y-endY)+sinaAbs*width*0.4*2);
}
},
start = function() {
var fWidth = $foreground.width,
fHeight = $foreground.height;
clearCircles();
clearLines();
drawAnimatedCircles(fWidth, fHeight);
drawAnimatedLines(fWidth, fHeight);
w.reqAnimeFrame(function(){
start();
});
};
start();
},
'config': {
'circle': {
'amount': 10,
'rgba': [157, 97, 207, 0.3],
'rgba_delta': 5,
'shadow': [46, 30, 105, 0.9],
'shadow_delta': 3,
'blur': 0.2,
'speed': 0.3,
},
'line': {
'amount': 10,
'rgba': [255, 255, 255, 0.5],
'rgba_delta': 5,
'shadow': [255, 255, 255, 0.8],
'shadow_delta': 3,
'blur': 0.1,
'speed': 0.5,
},
'angle': 20
},
'setCanvasSize': function() {
var w = $w,
wWidth = w.innerWidth,
wHeight = w.innerHeight;
$foreground.width = wWidth;
$foreground.height = wHeight;
$background.width = wWidth;
$background.height = wHeight;
return this;
},
'clearForegroundCanvas': function() {
var fWidth = $foreground.width,
fHeight = $foreground.height;
$fctx.clearRect(0, 0, fWidth, fHeight);
return this;
},
'drawCircle': function(x, y, radius, rgba, shadow, blur) {
var gradient = $fctx.createRadialGradient(x, y, radius, x, y, 0);
gradient.addColorStop(0, 'rgba('+rgba.join(',')+')');
gradient.addColorStop(1, 'rgba('+rgba.slice(0, 3).join(',')+','+(rgba[3]-0.1)+')');
$fctx.beginPath();
$fctx.arc(x, y, radius, 0, $M.PI*2, false);
$fctx.shadowBlur = radius*blur;
$fctx.shadowColor = 'rgba('+shadow.join(',')+')';
$fctx.fillStyle = gradient;
$fctx.fill();
},
'drawLine': function(x, y, endX, endY, width, rgba, shadow, blur) {
var gradient = $fctx.createLinearGradient(x, y, endX, endY);
gradient.addColorStop(0, 'rgba('+rgba.join(',')+')');
gradient.addColorStop(1, 'rgba('+rgba.slice(0, 3).join(',')+','+(rgba[3]-0.1)+')');
$fctx.beginPath();
$fctx.moveTo(x, y);
$fctx.lineTo(endX, endY);
$fctx.lineWidth = 3;
$fctx.lineCap = 'round';
$fctx.shadowBlur = width*blur;
$fctx.shadowColor = 'rgba('+shadow.join(',')+')';
$fctx.strokeStyle = gradient;
$fctx.stroke();
},
'drawBackground': function() {
var bWidth = $background.width,
bHeight = $background.height,
gradient;
$bctx.clearRect(0, 0, bWidth, bHeight);
$bctx.fillStyle = '#000000';
$bctx.fillRect(0, 0, bWidth, bHeight);
gradient = $bctx.createRadialGradient(bWidth*0.3, bHeight*0.1, 0, bWidth*0.3, bHeight*0.1, bWidth*0.9);
gradient.addColorStop(0, 'rgb(0, 26, 77)');
gradient.addColorStop(1, 'transparent');
$bctx.translate(bWidth, 0);
$bctx.scale(-1,1);
$bctx.fillStyle = gradient;
$bctx.fillRect(0, 0, bWidth, bHeight);
gradient = $bctx.createRadialGradient(bWidth*0.1, bHeight*0.1, 0, bWidth*0.3, bHeight*0.1, bWidth);
gradient.addColorStop(0, 'rgb(0, 150, 240)');
gradient.addColorStop(0.8, 'transparent');
$bctx.translate(bWidth, 0);
$bctx.scale(-1,1);
$bctx.fillStyle = gradient;
$bctx.fillRect(0, 0, bWidth, bHeight);
gradient = $bctx.createRadialGradient(bWidth*0.1, bHeight*0.5, 0, bWidth*0.1, bHeight*0.5, bWidth*0.5);
gradient.addColorStop(0, 'rgb(40, 20, 105)');
gradient.addColorStop(1, 'transparent');
$bctx.fillStyle = gradient;
$bctx.fillRect(0, 0, bWidth, bHeight);
return this;
},
'createItems': function() {
var degree = this.config.angle/360*$M.PI*2,
sina = $M.sin(degree),
cosa = $M.cos(degree),
sinaAbs = $M.abs(sina),
cosaAbs = $M.abs(cosa),
config = this.config,
circle = config.circle,
i = circle.amount,
circle_red = circle.rgba[0],
circle_green = circle.rgba[1],
circle_blue = circle.rgba[2],
circle_alpha = circle.rgba[3],
circle_rgba_delta = circle.rgba_delta,
circle_shadow_red = circle.shadow[0],
circle_shadow_green = circle.shadow[1],
circle_shadow_blue = circle.shadow[2],
circle_shadow_alpha = circle.shadow[3],
circle_shadow_delta = circle.shadow_delta,
circle_blur = circle.blur,
circle_speed = circle.speed,
line = config.line,
j = line.amount,
line_red = line.rgba[0],
line_green = line.rgba[1],
line_blue = line.rgba[2],
line_alpha = line.rgba[3],
line_rgba_delta = line.rgba_delta,
line_shadow_red = line.shadow[0],
line_shadow_green = line.shadow[1],
line_shadow_blue = line.shadow[2],
line_shadow_alpha = line.shadow[3],
line_shadow_delta = line.shadow_delta,
line_blur = line.blur,
line_speed = line.speed,
fWidth = $foreground.width,
fHeight = $foreground.height,
radius, width,
delta_color = function(color, delta) {
var d = ~~ ($M.pow(-1, ($M.random()*2&1))*$M.random()*(delta+1)), //~~(num+0.5) is the same as Math.round(), but faster
color_delta = color + d;
if (color_delta < 0) {
return 0;
} else {
if (color_delta > 255) {
return 255;
} else {
return color_delta;
}
}
};
this.items.circles = [];
this.items.lines = [];
while (i > 0) {
i -= 1;
radius = $M.random()*(20+i*5)+(20+i*5);
this.items.circles.push({
'x': $M.random()*(fWidth+radius*2),
'y': $M.random()*(fHeight+radius*2),
'radius': radius,
'rgba': [delta_color(circle_blue, circle_rgba_delta), delta_color(circle_green, circle_rgba_delta), delta_color(circle_blue, circle_rgba_delta), $M.random()*0.4+circle_alpha*$M.random()*0.6],
'shadow': [delta_color(circle_shadow_red, circle_shadow_delta), delta_color(circle_shadow_green, circle_shadow_delta), delta_color(circle_shadow_blue, circle_shadow_delta), $M.random()*0.5+circle_shadow_alpha*0.5],
'blur': $M.random()*circle_blur,
'speed': circle_speed*(0.8+i*0.5)
});
}
while (j > 0) {
j -= 1;
width = $M.random()*(20+j*5)+(20+j*5);
this.items.lines.push({
'x': $M.random()*(fWidth+width*cosaAbs),
'y': $M.random()*(fHeight+width*sinaAbs),
'width': width,
'rgba': [delta_color(line_red, line_rgba_delta), delta_color(line_green, line_rgba_delta), delta_color(line_blue, line_rgba_delta), $M.random()*0.4+line_alpha*$M.random()*0.6],
'shadow': [delta_color(line_shadow_red, line_shadow_delta), delta_color(line_shadow_green, line_shadow_delta), delta_color(line_shadow_blue, line_shadow_delta), $M.random()*0.5+line_shadow_alpha*0.5],
'blur': $M.random()*line_blur,
'speed': line_speed*(0.8+j*0.5)
});
}
console.log(this.items.circles, this.items.lines);
return this;
},
'items': {}
}
};
window.reqAnimeFrame = window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function(callback){
window.setTimeout(callback, 1000 / 60);
};
var amazing = phasebeam(document.getElementById('phasebeam'));
window.addEventListener("load", function () {
amazing.setCanvasSize().createItems().drawBackground().animate();
}, false);
window.addEventListener("resize", function () {
amazing.setCanvasSize().drawBackground().clearForegroundCanvas();
setTimeout(function() {
amazing.createItems();
}, 500)
}, false);