I. Overview
1. Expected effect
In the large screen scene, add a cool particle shuttle background to the decision report, and the effect is shown in the following figure:
2. Implementation ideas
Set initialization JS event to generate dynamic background.
II. Example
1. Design report
Click the body component to add after initialization events, as shown in the figure below:
The JavaScript code is as follows:
$("body").prepend('<canvas id="mycanvas" style="position:absolute;z-index:-2; background-color:black;"></canvas>');
var canvas = mycanvas;
var w = window.innerWidth;
var h = window.innerHeight;
canvas.width = w;
canvas.height = h;
canvas.backgroundColor = "#000";
var ctx = canvas.getContext('2d');
function Build() {
this.ctx = ctx;
this.counts = 3000;
this.maxSize = 4;
this.halfWidth = w / 2,
this.halfHeight = h / 2;
this.arr = [];
}
Build.prototype.add = function(coor) {
var grd = this.ctx.createRadialGradient(coor.x, coor.y, coor.size / 2, coor.x, coor.y, coor.size);
grd.addColorStop(0, "white");
grd.addColorStop(1, coor.color);
this.ctx.fillStyle = grd;
this.ctx.beginPath();
this.ctx.arc(coor.x, coor.y, coor.size, 0, Math.PI * 2, true);
this.ctx.transform(1, 0, 0, 1, 0, coor.z);
this.ctx.closePath();
this.ctx.fill();
}
Build.prototype.init = function() {
this.run();
this.render();
this.animate();
}
Build.prototype.run = function() {
var nums = 0;
while (nums < this.counts) {
var coor = {
x: Math.ceil(Math.random() * w),
y: Math.ceil(Math.random() * h),
posx: Math.random() * w - this.halfWidth,
posy: Math.random() * h - this.halfHeight,
fl: 100,
speed: Math.random() * 2,
posz: Math.random() * 250,
r: Math.ceil(Math.random() * this.maxSize),
color: "rgba(" + Math.ceil(Math.random() * 255) + "," + Math.ceil(Math.random() * 255) + "," + Math.ceil(Math.random() * 255) + "," + Math.random() + ")"
};
this.arr.push(coor);
nums++;
}
}
Build.prototype.clear = function() {
ctx.clearRect(0, 0, w, h);
}
Build.prototype.render = function() {
this.clear();
for (var item of this.arr) {
this.draw(item);
}
}
Build.prototype.animate = function() {
var _this = this;
this.render();
window.requestAnimationFrame(function() {
_this.animate();
});
},
Build.prototype.draw = function(item) {
if (item.posz > -item.fl) {
var scale = item.fl / (item.fl + item.posz);
item.x = this.halfWidth + item.posx * scale;
item.y = this.halfHeight + item.posy * scale;
item.size = item.r * scale;
item.posz -= item.speed;
} else {
item.posz = Math.random() * 250;
}
this.add(item);
}
var app = new Build();
app.init();
window.addEventListener('resize', function() {
canvas.width = w = window.innerWidth;
canvas.height = h = window.innerHeight;
}, false);
2. Effect preview
Save the template, click dashboard preview, the effect is as shown in I.1 expected effect.
III. Template download
For completed templates, please refer to:
%fr_HOME%\webapps\webroot\WEB-INF\reportlets\doc-EN\JS\JS_particle_shuttle.frm
Click to download the template:JS_particle_shuttle.frm