270 lines
8.9 KiB
JavaScript
270 lines
8.9 KiB
JavaScript
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(function (global, factory) {
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typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
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typeof define === 'function' && define.amd ? define(factory) :
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(global.MoveRiver = factory());
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}(this, (function () { 'use strict';
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var tool = {
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merge: function merge(settings, defaults) {
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Object.keys(settings).forEach(function (key) {
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defaults[key] = settings[key];
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});
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},
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//计算两点间距离
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getDistance: function getDistance(p1, p2) {
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return Math.sqrt((p1[0] - p2[0]) * (p1[0] - p2[0]) + (p1[1] - p2[1]) * (p1[1] - p2[1]));
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},
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//判断点是否在线段上
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containStroke: function containStroke(x0, y0, x1, y1, lineWidth, x, y) {
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if (lineWidth === 0) {
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return false;
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}
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var _l = lineWidth;
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var _a = 0;
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var _b = x0;
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// Quick reject
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if (y > y0 + _l && y > y1 + _l || y < y0 - _l && y < y1 - _l || x > x0 + _l && x > x1 + _l || x < x0 - _l && x < x1 - _l) {
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return false;
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}
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if (x0 !== x1) {
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_a = (y0 - y1) / (x0 - x1);
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_b = (x0 * y1 - x1 * y0) / (x0 - x1);
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} else {
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return Math.abs(x - x0) <= _l / 2;
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}
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var tmp = _a * x - y + _b;
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var _s = tmp * tmp / (_a * _a + 1);
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return _s <= _l / 2 * _l / 2;
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}
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};
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var resolutionScale = function (context) {
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var devicePixelRatio = window.devicePixelRatio || 1;
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context.canvas.width = context.canvas.width * devicePixelRatio;
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context.canvas.height = context.canvas.height * devicePixelRatio;
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context.canvas.style.width = context.canvas.width / devicePixelRatio + 'px';
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context.canvas.style.height = context.canvas.height / devicePixelRatio + 'px';
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context.scale(devicePixelRatio, devicePixelRatio);
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};
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var global = typeof window === 'undefined' ? {} : window;
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var cancelAnimationFrame = global.cancelAnimationFrame || global.mozCancelAnimationFrame || global.webkitCancelAnimationFrame || global.msCancelAnimationFrame || function (id) {
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clearTimeout(id);
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};
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var MoveRiver = function MoveRiver(map, userOptions) {
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var self = this;
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self.map = map;
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//默认参数
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var options = {
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lineWidth: 0.5, //线条宽度
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lineStyle: '#C82800', //线条颜色
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animateLineWidth: 1, //动画线条宽度
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animateLineStyle: '#ffff00', //动画线条颜色
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// colors: ["#516b91", "#59c4e6", "#edafda", "#93b7e3", "#a5e7f0", "#cbb0e3"]
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colors: ["#c1232b", "#27727b", "#fcce10", "#e87c25", "#b5c334", "#fe8463", "#9bca63", "#fad860", "#f3a43b", "#60c0dd", "#d7504b", "#c6e579", "#f4e001", "#f0805a", "#26c0c0"]
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};
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self.init(userOptions, options);
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//全局变量
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var baseCtx = self.baseCtx = self.options.canvas.getContext("2d");
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var animateCtx = self.animateCtx = self.options.animateCanvas.getContext("2d");
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baseCtx.lineWidth = options.lineWidth;
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};
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MoveRiver.prototype.init = function (setting, defaults) {
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//合并参数
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tool.merge(setting, defaults);
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this.options = defaults;
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};
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MoveRiver.prototype.render = function () {
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var self = this;
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var baseCtx = self.baseCtx;
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if (!baseCtx) {
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return;
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}
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var roadLines = self.roadLines;
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roadLines.forEach(function (line) {
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line.drawPath(baseCtx, self.map, self.options);
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});
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};
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MoveRiver.prototype.animate = function () {
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var self = this;
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var animateCtx = self.animateCtx;
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if (!animateCtx) {
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return;
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}
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// animateCtx.clearRect(0, 0, self.map.width, self.map.height);
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animateCtx.fillStyle = "rgba(0,0,0,0.9)";
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var prev = animateCtx.globalCompositeOperation;
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animateCtx.globalCompositeOperation = "destination-in";
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animateCtx.fillRect(0, 0, self.map.width, self.map.height);
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animateCtx.globalCompositeOperation = prev;
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var roadLines = self.roadLines;
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roadLines.forEach(function (line) {
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line.draw(animateCtx, self.map, self.options);
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// line.drawCircle(animateCtx, self.map, self.options);
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});
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};
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MoveRiver.prototype.adjustSize = function () {
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var width = this.map.width;
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var height = this.map.height;
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this.baseCtx.canvas.width = width;
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this.baseCtx.canvas.height = height;
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this.animateCtx.canvas.width = width;
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this.animateCtx.canvas.height = height;
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resolutionScale(this.baseCtx);
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resolutionScale(this.animateCtx);
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};
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MoveRiver.prototype.start = function () {
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var self = this;
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self.stop();
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self.adjustSize();
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self.addLine();
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self.render();
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// (function drawFrame() {
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// self.timer = setTimeout(function () {
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// self.animationId = requestAnimationFrame(drawFrame);
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// self.animate();
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// }, 1000 / 10);
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// })();
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// (function drawFrame() {
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// requestAnimationFrame(drawFrame);
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// self.animate();
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// })();
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};
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MoveRiver.prototype.stop = function () {
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var self = this;
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cancelAnimationFrame(self.animationId);
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if (self.timer) {
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clearTimeout(self.timer);
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}
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};
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MoveRiver.prototype.addLine = function () {
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var options = this.options;
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var roadLines = this.roadLines = [],
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dataset = this.options.data;
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dataset.forEach(function (line, i) {
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roadLines.push(new Line({
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points: line,
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color: options.colors[Math.floor(Math.random() * options.colors.length)]
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}));
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});
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};
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function Line(options) {
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this.points = options.points || [];
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this.age = options.age || 0;
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this.maxAge = options.maxAge || 0;
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this.color = options.color || '#ffff00';
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}
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Line.prototype.getPointList = function (map) {
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var path = this.path = [],
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points = this.points;
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if (points && points.length > 0) {
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points.forEach(function (p) {
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path.push({
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pixel: map.toScreen(p)
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});
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});
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this.maxAge = path.length;
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}
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return path;
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};
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Line.prototype.drawPath = function (context, map, options) {
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var pointList = this.path || this.getPointList(map);
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context.beginPath();
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context.lineWidth = options.lineWidth;
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context.strokeStyle = this.color;
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// context.strokeStyle = options.lineStyle;
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context.moveTo(pointList[0].pixel.x, pointList[0].pixel.y);
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for (var i = 0, len = pointList.length; i < len; i++) {
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context.lineTo(pointList[i].pixel.x, pointList[i].pixel.y);
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}
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context.stroke();
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};
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Line.prototype.draw = function (context, map, options) {
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var pointList = this.path || this.getPointList(map);
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var movePoints = this.movePoints;
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if (movePoints && movePoints.length > 0) {
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var moveLen = movePoints.length;
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for (var i = 0; i < moveLen; i++) {
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if (movePoints[i] >= this.maxAge - 1) {
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movePoints[i] = Math.floor(Math.random() * (pointList.length - 1));
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}
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var currentPoint = pointList[movePoints[i]];
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context.beginPath();
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context.lineWidth = options.animateLineWidth;
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context.strokeStyle = this.color;
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context.lineCap = "round";
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context.moveTo(currentPoint.pixel.x, currentPoint.pixel.y);
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context.lineTo(pointList[movePoints[i] + 1].pixel.x, pointList[movePoints[i] + 1].pixel.y);
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context.stroke();
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this.movePoints[i]++;
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}
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} else {
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this.random(map);
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}
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};
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Line.prototype.drawCircle = function (context, map, options) {
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var pointList = this.path || this.getPointList(map);
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if (this.movePoints && this.movePoints.length > 0) {
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var moveLen = this.movePoints.length;
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for (var i = 0; i < moveLen; i++) {
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if (this.movePoints[i] >= this.maxAge - 1) {
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this.movePoints[i] = Math.floor(Math.random() * pointList.length);
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}
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var currentPoint = pointList[this.movePoints[i]];
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context.beginPath();
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context.arc(currentPoint.pixel.x, currentPoint.pixel.y, 1, 0, Math.PI * 2);
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context.fillStyle = this.color;
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context.fill();
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this.movePoints[i]++;
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}
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} else {
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this.random(map);
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}
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};
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Line.prototype.random = function (map) {
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var pointList = this.path || this.getPointList(map);
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var arr = [];
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var maxNum = Math.floor(pointList.length / 9);
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while (arr.length < maxNum) {
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//原数组长度为0，每次成功添加一个元素后长度加1，则当数组添加最后一个数字之前长度为9即可
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var num = Math.floor(Math.random() * pointList.length); //生成一个0-100的随机整数
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if (arr.length === 0) {
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//如果数组长度为0则直接添加到arr数组
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arr.push(num);
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} else {
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for (var i = 0; i < arr.length; i++) {
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//当新生成的数字与数组中的元素不重合时则添加到arr数组
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if (arr.join(',').indexOf(num) < 0) {
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arr.push(num);
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}
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}
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}
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}
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this.movePoints = arr;
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};
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return MoveRiver;
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})));
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