slambb_proadvanced_tool/util/util-js/effect/firework.js

/**
 * 烟花特效
 */
function Event() {
	this.events = {};
}
Event.prototype.addEventListener = function(type, listener) {
	this.events[type] = this.events[type] || [];
	this.events[type].push(listener);
};
Event.prototype.trigger = function() {
	for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
		args[_key] = arguments[_key];
	}

	var type = args[0];
	var params = args.slice(1);
	if (!!this.events[type]) {
		// console.log("type:",type);
		this.events[type].forEach(function(listener) {
			try {
				listener.apply(null, params);
			} catch (e) {
				console.error(e);
			}
		});
	}
};
// get a random number within a range
function random(min, max) {
	return Math.random() * (max - min) + min;
}

// calculate the distance between two points
function calculateDistance(p1x, p1y, p2x, p2y) {
	var xDistance = p1x - p2x,
		yDistance = p1y - p2y;
	return Math.sqrt(Math.pow(xDistance, 2) + Math.pow(yDistance, 2));
}


// create firework
var Firework = function Firework(image, typeImage, direction, tx, ty, cw, ch, offest, hiddenMidImage) {
	this.event = new Event();
	//图片信息
	this.image = image;
	this.typeImage = typeImage;
	this.direction = direction;
	this.position = {
		"EF_baozha_0": [0, 0, 312, 312],
		"EF_baozha_1": [312, 0, 312, 312],
		"EF_baozha_2": [624, 0, 312, 312],
		"EF_baozha_3": [936, 0, 312, 312],
		"EF_baozha_4": [0, 312, 312, 312],
		"EF_baozha_5": [312, 312, 312, 312],
		"EF_baozha_6": [624, 312, 312, 312],
		"EF_baozha_7": [936, 312, 312, 312],
		"EF_baozha_8": [0, 624, 312, 312],
		"EF_baozha_9": [312, 624, 312, 312],
		"EF_baozha_10": [624, 624, 312, 312],
		"EF_baozha_11": [936, 624, 312, 312],
		"EF_baozha_12": [0, 936, 312, 312],
		"EF_baozha_13": [312, 936, 312, 312],
		"EF_baozha_14": [624, 936, 312, 312],
		"EF_baozha_15": [936, 936, 312, 312],
		"EF_baozha_16": [0, 1248, 312, 312],
		"EF_baozha_17": [312, 1248, 312, 312],
		"EF_baozha_18": [624, 1248, 312, 312],
		"EF_baozha_19": [936, 1248, 312, 312]
	};
	// target coordinates
	this.tx = tx;
	this.ty = ty;

	this.cw = cw;
	this.ch = ch;

	this.offest = offest;

	this.index = 0;
	// let _this = this;
	// this.animationInstance = new Animation({
	// 	timing: 'easeIn',
	// 	duration: 1000,
	// 	onProcess: function onProcess(process) {
	// 		_this.event.trigger('renderProcess', process);

	// 	},
	// 	onAnimationFinish: function onAnimationFinish() {
	// 		_this.event.trigger('renderComplete');
	// 	}
	// });
	this.hiddenMidImage = hiddenMidImage || false;


	const innerAudioContext = uni.createInnerAudioContext();
	innerAudioContext.autoplay = true;
	innerAudioContext.src = '/static/elect/hit.mp3';
	innerAudioContext.onPlay(() => {
		// console.log('开始播放');
	});
	innerAudioContext.onError((res) => {
		console.log(res.errMsg);
		console.log(res.errCode);
	});
	setTimeout(() => {
		innerAudioContext.destroy();
	}, 800)
}

Firework.prototype.addEventListener = function(type, listener) {
	this.event.addEventListener(type, listener);
};

// draw firework
Firework.prototype.draw = function(ctx, callback) {
	if (this.index > 19) return;
	let i = this.index;
	let temp = this.position["EF_baozha_" + i];
	// console.log("draw:"+this.direction);
	let tempX = this.tx * this.direction;
	let tempValue = this.direction < 0 ? 65 : -25
	ctx.drawImage(this.image.path,
		temp[0] //截取原始图片的 x坐标
		, temp[1] //截取原始图片的 y坐标
		, 312 //截取原始图片的 宽度
		, 312 // 截取的高度
		, tempX - 264 * 0.5 - tempValue + this.offest //图片在canvas画布上的x坐标
		, -50 //图片在canvas画布上的y坐标
		, 264 //绘制图片的宽度
		, 264 //绘制图片的高度
	);
	if (!this.hiddenMidImage) {
		//19
		let _r = this.index / 32 + 1;
		ctx.save();
		//如果是相反绘制，需要加多一个自身位置偏移
		let _pos = this.direction < 0 ? this.typeImage.width : 0;
		//左边位置
		let left = (this.typeImage.width + tempX - 164 * 0.5) - (this.typeImage.width / 2 - _pos) * _r + 20 -
			tempValue + this.offest;
		// 中心点 this.cw / 2 - this.typeImage.width / 2 * _r
		ctx.translate(left, this.ch / 2 - this.typeImage.height / 2 * _r);
		ctx.scale(_r * this.direction, _r);
		ctx.drawImage(this.typeImage.path, 0, 0);
		ctx.restore();
	}
	if (i === 19 && callback) {
		callback();
	}
	this.index++;

}

if (typeof module === "object" && typeof module.exports === "object") {
	module.exports = Firework;
}