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大屏场景下,给决策报表添加一个酷炫的大屏旋转星空背景,如下图所示:
用户可直接用 JS 代码来制作旋转的动态星空背景。
新建决策报表,另存为:%FR_HOME%\webapps\webroot\WEB-INF\reportlets\doc\JS\表单JS实例\33-JS实现大屏旋转星空背景.frm。
点击 body 组件,添加初始化后事件,如下图所示:
JavaScript 代码如下:
$("body").prepend('<canvas id="canvas" style="position:absolute;z-index:-2;"></canvas>');var canvas = document.getElementById('canvas'),ctx = canvas.getContext('2d'),w = canvas.width = window.innerWidth,h = canvas.height = window.innerHeight,hue = 217,stars = [],count = 0,maxStars = 1100; //星星数量,默认1300var canvas2 = document.createElement('canvas'),ctx2 = canvas2.getContext('2d');canvas2.width = 100;canvas2.height = 100;var half = canvas2.width / 2,gradient2 = ctx2.createRadialGradient(half, half, 0, half, half, half);gradient2.addColorStop(0.025, '#CCC');gradient2.addColorStop(0.1, 'hsl(' + hue + ', 61%, 33%)');gradient2.addColorStop(0.25, 'hsl(' + hue + ', 64%, 6%)');gradient2.addColorStop(1, 'transparent');ctx2.fillStyle = gradient2;ctx2.beginPath();ctx2.arc(half, half, half, 0, Math.PI * 2);ctx2.fill();// End cachefunction random(min, max) { if (arguments.length < 2) { max = min; min = 0; } if (min > max) { var hold = max; max = min; min = hold; } return Math.floor(Math.random() * (max - min + 1)) + min;}function maxOrbit(x, y) { var max = Math.max(x, y), diameter = Math.round(Math.sqrt(max * max + max * max)); return diameter / 2; //星星移动范围,值越大范围越小,}var Star = function() { this.orbitRadius = random(maxOrbit(w, h)); this.radius = random(60, this.orbitRadius) / 10; //星星大小,值越大星星越小,默认8 this.orbitX = w / 2; this.orbitY = h / 2; this.timePassed = random(0, maxStars); this.speed = random(this.orbitRadius) / 80000; //星星移动速度,值越大越慢,默认5W this.alpha = random(2, 10) / 10; count++; stars[count] = this;}Star.prototype.draw = function() { var x = Math.sin(this.timePassed) * this.orbitRadius + this.orbitX, y = Math.cos(this.timePassed) * this.orbitRadius + this.orbitY, twinkle = random(10); if (twinkle === 1 && this.alpha > 0) { this.alpha -= 0.05; } else if (twinkle === 2 && this.alpha < 1) { this.alpha += 0.05; } ctx.globalAlpha = this.alpha; ctx.drawImage(canvas2, x - this.radius / 2, y - this.radius / 2, this.radius, this.radius); this.timePassed += this.speed;}for (var i = 0; i < maxStars; i++) { new Star();}function animation() { ctx.globalCompositeOperation = 'source-over'; ctx.globalAlpha = 0.5; //尾巴 ctx.fillStyle = 'hsla(' + hue + ', 64%, 6%, 2)'; ctx.fillRect(0, 0, w, h) ctx.globalCompositeOperation = 'lighter'; for (var i = 1, l = stars.length; i < l; i++) { stars[i].draw(); }; window.requestAnimationFrame(animation);}animation();
保存模板,点击预览,效果如1.1 预期效果所示。
已完成模板请参见:%FR_HOME%\webapps\webroot\WEB-INF\reportlets\doc\JS\表单JS实例\33-JS实现大屏旋转星空背景.frm。
点击下载模板:33-JS实现大屏旋转星空背景.frm
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