Js烟花代码分享

缺乏、安全感 2022-10-11 06:19 238阅读 0赞

先展示下图

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NDc2MjUw_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NDc2MjUw_size_16_color_FFFFFF_t_70 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NDc2MjUw_size_16_color_FFFFFF_t_70 2][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NDc2MjUw_size_16_color_FFFFFF_t_70 3][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NDc2MjUw_size_16_color_FFFFFF_t_70 4][]

下面附上代码，仅供娱乐，下面的代码直接复制就能用。

打开网页后是黑色的，需要点击才会发射。

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>发射烟花</title>
        <script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
        <script>
            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 = 1300;//星星数量
    
            var 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 cache
    
            function 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) / 8;
                //星星大小
                this.orbitX = w / 2;
                this.orbitY = h / 2;
                this.timePassed = random(0, maxStars);
                this.speed = random(this.orbitRadius) / 50000;
                //星星移动速度
                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();
                    canvas2.style.cssText = "display:none";
                };
    
                window.requestAnimationFrame(animation);
            }
    
    
            animation();
        </script>
        <script>
            $(function () {
                var Fireworks = function () {
                    var self = this;
                    var rand = function (rMi, rMa) { return ~~((Math.random() * (rMa - rMi + 1)) + rMi); }
                    var hitTest = function (x1, y1, w1, h1, x2, y2, w2, h2) { return !(x1 + w1 < x2 || x2 + w2 < x1 || y1 + h1 < y2 || y2 + h2 < y1); };
                    window.requestAnimFrame = function () { return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function (a) { window.setTimeout(a, 1E3 / 60) } }();
    
                    self.init = function () {
                        self.canvas = document.createElement('canvas');
                        self.canvas.width = self.cw = $(window).innerWidth();
                        self.canvas.height = self.ch = $(window).innerHeight();
                        self.particles = [];
                        self.partCount = 150;
                        self.fireworks = [];
                        self.mx = self.cw / 2;
                        self.my = self.ch / 2;
                        self.currentHue = 30;
                        self.partSpeed = 5;
                        self.partSpeedVariance = 10;
                        self.partWind = 50;
                        self.partFriction = 5;
                        self.partGravity = 1;
                        self.hueMin = 0;
                        self.hueMax = 360;
                        self.fworkSpeed = 4;
                        self.fworkAccel = 10;
                        self.hueVariance = 30;
                        self.flickerDensity = 25;
                        self.showShockwave = true;
                        self.showTarget = false;
                        self.clearAlpha = 25;
    
                        $(document.body).append(self.canvas);
                        self.ctx = self.canvas.getContext('2d');
                        self.ctx.lineCap = 'round';
                        self.ctx.lineJoin = 'round';
                        self.lineWidth = 1;
                        self.bindEvents();
                        self.canvasLoop();
    
                        self.canvas.onselectstart = function () {
                            return false;
                        };
                    };
    
                    self.createParticles = function (x, y, hue) {
                        var countdown = self.partCount;
                        while (countdown--) {
                            var newParticle = {
                                x: x,
                                y: y,
                                coordLast: [
                                    { x: x, y: y },
                                    { x: x, y: y },
                                    { x: x, y: y }
                                ],
                                angle: rand(0, 360),
                                speed: rand(((self.partSpeed - self.partSpeedVariance) <= 0) ? 1 : self.partSpeed - self.partSpeedVariance, (self.partSpeed + self.partSpeedVariance)),
                                friction: 1 - self.partFriction / 100,
                                gravity: self.partGravity / 2,
                                hue: rand(hue - self.hueVariance, hue + self.hueVariance),
                                brightness: rand(50, 80),
                                alpha: rand(40, 100) / 100,
                                decay: rand(10, 50) / 1000,
                                wind: (rand(0, self.partWind) - (self.partWind / 2)) / 25,
                                lineWidth: self.lineWidth
                            };
                            self.particles.push(newParticle);
                        }
                    };
    
    
                    self.updateParticles = function () {
                        var i = self.particles.length;
                        while (i--) {
                            var p = self.particles[i];
                            var radians = p.angle * Math.PI / 180;
                            var vx = Math.cos(radians) * p.speed;
                            var vy = Math.sin(radians) * p.speed;
                            p.speed *= p.friction;
    
                            p.coordLast[2].x = p.coordLast[1].x;
                            p.coordLast[2].y = p.coordLast[1].y;
                            p.coordLast[1].x = p.coordLast[0].x;
                            p.coordLast[1].y = p.coordLast[0].y;
                            p.coordLast[0].x = p.x;
                            p.coordLast[0].y = p.y;
    
                            p.x += vx;
                            p.y += vy;
                            p.y += p.gravity;
    
                            p.angle += p.wind;
                            p.alpha -= p.decay;
    
                            if (!hitTest(0, 0, self.cw, self.ch, p.x - p.radius, p.y - p.radius, p.radius * 2, p.radius * 2) || p.alpha < .05) {
                                self.particles.splice(i, 1);
                            }
                        };
                    };
    
                    self.drawParticles = function () {
                        var i = self.particles.length;
                        while (i--) {
                            var p = self.particles[i];
    
                            var coordRand = (rand(1, 3) - 1);
                            self.ctx.beginPath();
                            self.ctx.moveTo(Math.round(p.coordLast[coordRand].x), Math.round(p.coordLast[coordRand].y));
                            self.ctx.lineTo(Math.round(p.x), Math.round(p.y));
                            self.ctx.closePath();
                            self.ctx.strokeStyle = 'hsla(' + p.hue + ', 100%, ' + p.brightness + '%, ' + p.alpha + ')';
                            self.ctx.stroke();
    
                            if (self.flickerDensity > 0) {
                                var inverseDensity = 50 - self.flickerDensity;
                                if (rand(0, inverseDensity) === inverseDensity) {
                                    self.ctx.beginPath();
                                    self.ctx.arc(Math.round(p.x), Math.round(p.y), rand(p.lineWidth, p.lineWidth + 3) / 2, 0, Math.PI * 2, false)
                                    self.ctx.closePath();
                                    var randAlpha = rand(50, 100) / 100;
                                    self.ctx.fillStyle = 'hsla(' + p.hue + ', 100%, ' + p.brightness + '%, ' + randAlpha + ')';
                                    self.ctx.fill();
                                }
                            }
                        };
                    };
    
    
                    self.createFireworks = function (startX, startY, targetX, targetY) {
                        var newFirework = {
                            x: startX,
                            y: startY,
                            startX: startX,
                            startY: startY,
                            hitX: false,
                            hitY: false,
                            coordLast: [
                                { x: startX, y: startY },
                                { x: startX, y: startY },
                                { x: startX, y: startY }
                            ],
                            targetX: targetX,
                            targetY: targetY,
                            speed: self.fworkSpeed,
                            angle: Math.atan2(targetY - startY, targetX - startX),
                            shockwaveAngle: Math.atan2(targetY - startY, targetX - startX) + (90 * (Math.PI / 180)),
                            acceleration: self.fworkAccel / 100,
                            hue: self.currentHue,
                            brightness: rand(50, 80),
                            alpha: rand(50, 100) / 100,
                            lineWidth: self.lineWidth
                        };
                        self.fireworks.push(newFirework);
    
                    };
    
    
                    self.updateFireworks = function () {
                        var i = self.fireworks.length;
    
                        while (i--) {
                            var f = self.fireworks[i];
                            self.ctx.lineWidth = f.lineWidth;
    
                            vx = Math.cos(f.angle) * f.speed,
                                vy = Math.sin(f.angle) * f.speed;
                            f.speed *= 1 + f.acceleration;
                            f.coordLast[2].x = f.coordLast[1].x;
                            f.coordLast[2].y = f.coordLast[1].y;
                            f.coordLast[1].x = f.coordLast[0].x;
                            f.coordLast[1].y = f.coordLast[0].y;
                            f.coordLast[0].x = f.x;
                            f.coordLast[0].y = f.y;
    
                            if (f.startX >= f.targetX) {
                                if (f.x + vx <= f.targetX) {
                                    f.x = f.targetX;
                                    f.hitX = true;
                                } else {
                                    f.x += vx;
                                }
                            } else {
                                if (f.x + vx >= f.targetX) {
                                    f.x = f.targetX;
                                    f.hitX = true;
                                } else {
                                    f.x += vx;
                                }
                            }
    
                            if (f.startY >= f.targetY) {
                                if (f.y + vy <= f.targetY) {
                                    f.y = f.targetY;
                                    f.hitY = true;
                                } else {
                                    f.y += vy;
                                }
                            } else {
                                if (f.y + vy >= f.targetY) {
                                    f.y = f.targetY;
                                    f.hitY = true;
                                } else {
                                    f.y += vy;
                                }
                            }
    
                            if (f.hitX && f.hitY) {
                                self.createParticles(f.targetX, f.targetY, f.hue);
                                self.fireworks.splice(i, 1);
    
                            }
                        };
                    };
    
                    self.drawFireworks = function () {
                        var i = self.fireworks.length;
                        self.ctx.globalCompositeOperation = 'lighter';
                        while (i--) {
                            var f = self.fireworks[i];
                            self.ctx.lineWidth = f.lineWidth;
    
                            var coordRand = (rand(1, 3) - 1);
                            self.ctx.beginPath();
                            self.ctx.moveTo(Math.round(f.coordLast[coordRand].x), Math.round(f.coordLast[coordRand].y));
                            self.ctx.lineTo(Math.round(f.x), Math.round(f.y));
                            self.ctx.closePath();
                            self.ctx.strokeStyle = 'hsla(' + f.hue + ', 100%, ' + f.brightness + '%, ' + f.alpha + ')';
                            self.ctx.stroke();
    
                            if (self.showTarget) {
                                self.ctx.save();
                                self.ctx.beginPath();
                                self.ctx.arc(Math.round(f.targetX), Math.round(f.targetY), rand(1, 8), 0, Math.PI * 2, false)
                                self.ctx.closePath();
                                self.ctx.lineWidth = 1;
                                self.ctx.stroke();
                                self.ctx.restore();
                            }
    
                            if (self.showShockwave) {
                                self.ctx.save();
                                self.ctx.translate(Math.round(f.x), Math.round(f.y));
                                self.ctx.rotate(f.shockwaveAngle);
                                self.ctx.beginPath();
                                self.ctx.arc(0, 0, 1 * (f.speed / 5), 0, Math.PI, true);
                                self.ctx.strokeStyle = 'hsla(' + f.hue + ', 100%, ' + f.brightness + '%, ' + rand(25, 60) / 100 + ')';
                                self.ctx.lineWidth = f.lineWidth;
                                self.ctx.stroke();
                                self.ctx.restore();
                            }
                        };
                    };
    
                    self.bindEvents = function () {
                        $(window).on('resize', function () {
                            clearTimeout(self.timeout);
                            self.timeout = setTimeout(function () {
                                self.canvas.width = self.cw = $(window).innerWidth();
                                self.canvas.height = self.ch = $(window).innerHeight();
                                self.ctx.lineCap = 'round';
                                self.ctx.lineJoin = 'round';
                            }, 100);
                        });
                        $(self.canvas).on('mousedown', function (e) {
                            self.mx = e.pageX - self.canvas.offsetLeft;
                            self.my = e.pageY - self.canvas.offsetTop;
                            self.currentHue = rand(self.hueMin, self.hueMax);
                            self.createFireworks(self.cw / 2, self.ch, self.mx, self.my);
    
                            $(self.canvas).on('mousemove.fireworks', function (e) {
                                self.mx = e.pageX - self.canvas.offsetLeft;
                                self.my = e.pageY - self.canvas.offsetTop;
                                self.currentHue = rand(self.hueMin, self.hueMax);
                                self.createFireworks(self.cw / 2, self.ch, self.mx, self.my);
                            });
                        });
    
                        $(self.canvas).on('mouseup', function (e) {
                            $(self.canvas).off('mousemove.fireworks');
                        });
    
                    }
                    self.clear = function () {
                        self.particles = [];
                        self.fireworks = [];
                        self.ctx.clearRect(0, 0, self.cw, self.ch);
                    };
                    self.canvasLoop = function () {
                        requestAnimFrame(self.canvasLoop, self.canvas);
                        self.ctx.globalCompositeOperation = 'destination-out';
                        self.ctx.fillStyle = 'rgba(0,0,0,' + self.clearAlpha / 100 + ')';
                        self.ctx.fillRect(0, 0, self.cw, self.ch);
                        self.updateFireworks();
                        self.updateParticles();
                        self.drawFireworks();
                        self.drawParticles();
    
                    };
    
                    self.init();
    
                }
                var fworks = new Fireworks();
    
            });
        </script>
    </head>
    <style>
        canvas {
            position: fixed;
            width: 100%;
            height: 100%;
            z-index: -1;
            background: #000;
        }
    </style>
    <body>
    <div>
        <canvas id="canvas"></canvas>
        <canvas id="snow"></canvas>
    
        <div class="am-g" style="position: fixed; bottom: 0px;">
            <div class="am-u-sm-12">
                <div style="z-index: 9999" id="player" class="aplayer">
                </div>
            </div>
        </div>
    </div>
    </body>
    </html>

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NDc2MjUw_size_16_color_FFFFFF_t_70 1]: /images/20221005/ea4bf499ab544bfe9a3568c1ddc8f13b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NDc2MjUw_size_16_color_FFFFFF_t_70 2]: /images/20221005/d30df1ae9a8046b890a280fe984eb19f.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NDc2MjUw_size_16_color_FFFFFF_t_70 3]: /images/20221005/e5fbdbaff1114679a64e685552cb6a34.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NDc2MjUw_size_16_color_FFFFFF_t_70 4]: /images/20221005/8cf07a0b4ddb4c9bb00e096df5b85f72.png