var easingFuncs = { linear: function (k) { return k; }, quadraticIn: function (k) { return k * k; }, quadraticOut: function (k) { return k * (2 - k); }, quadraticInOut: function (k) { if ((k *= 2) < 1) { return 0.5 * k * k; } return -0.5 * (--k * (k - 2) - 1); }, cubicIn: function (k) { return k * k * k; }, cubicOut: function (k) { return --k * k * k + 1; }, cubicInOut: function (k) { if ((k *= 2) < 1) { return 0.5 * k * k * k; } return 0.5 * ((k -= 2) * k * k + 2); }, quarticIn: function (k) { return k * k * k * k; }, quarticOut: function (k) { return 1 - (--k * k * k * k); }, quarticInOut: function (k) { if ((k *= 2) < 1) { return 0.5 * k * k * k * k; } return -0.5 * ((k -= 2) * k * k * k - 2); }, quinticIn: function (k) { return k * k * k * k * k; }, quinticOut: function (k) { return --k * k * k * k * k + 1; }, quinticInOut: function (k) { if ((k *= 2) < 1) { return 0.5 * k * k * k * k * k; } return 0.5 * ((k -= 2) * k * k * k * k + 2); }, sinusoidalIn: function (k) { return 1 - Math.cos(k * Math.PI / 2); }, sinusoidalOut: function (k) { return Math.sin(k * Math.PI / 2); }, sinusoidalInOut: function (k) { return 0.5 * (1 - Math.cos(Math.PI * k)); }, exponentialIn: function (k) { return k === 0 ? 0 : Math.pow(1024, k - 1); }, exponentialOut: function (k) { return k === 1 ? 1 : 1 - Math.pow(2, -10 * k); }, exponentialInOut: function (k) { if (k === 0) { return 0; } if (k === 1) { return 1; } if ((k *= 2) < 1) { return 0.5 * Math.pow(1024, k - 1); } return 0.5 * (-Math.pow(2, -10 * (k - 1)) + 2); }, circularIn: function (k) { return 1 - Math.sqrt(1 - k * k); }, circularOut: function (k) { return Math.sqrt(1 - (--k * k)); }, circularInOut: function (k) { if ((k *= 2) < 1) { return -0.5 * (Math.sqrt(1 - k * k) - 1); } return 0.5 * (Math.sqrt(1 - (k -= 2) * k) + 1); }, elasticIn: function (k) { var s; var a = 0.1; var p = 0.4; if (k === 0) { return 0; } if (k === 1) { return 1; } if (!a || a < 1) { a = 1; s = p / 4; } else { s = p * Math.asin(1 / a) / (2 * Math.PI); } return -(a * Math.pow(2, 10 * (k -= 1)) * Math.sin((k - s) * (2 * Math.PI) / p)); }, elasticOut: function (k) { var s; var a = 0.1; var p = 0.4; if (k === 0) { return 0; } if (k === 1) { return 1; } if (!a || a < 1) { a = 1; s = p / 4; } else { s = p * Math.asin(1 / a) / (2 * Math.PI); } return (a * Math.pow(2, -10 * k) * Math.sin((k - s) * (2 * Math.PI) / p) + 1); }, elasticInOut: function (k) { var s; var a = 0.1; var p = 0.4; if (k === 0) { return 0; } if (k === 1) { return 1; } if (!a || a < 1) { a = 1; s = p / 4; } else { s = p * Math.asin(1 / a) / (2 * Math.PI); } if ((k *= 2) < 1) { return -0.5 * (a * Math.pow(2, 10 * (k -= 1)) * Math.sin((k - s) * (2 * Math.PI) / p)); } return a * Math.pow(2, -10 * (k -= 1)) * Math.sin((k - s) * (2 * Math.PI) / p) * 0.5 + 1; }, // 在某一动画开始沿指示的路径进行动画处理前稍稍收回该动画的移动 backIn: function (k) { var s = 1.70158; return k * k * ((s + 1) * k - s); }, backOut: function (k) { var s = 1.70158; return --k * k * ((s + 1) * k + s) + 1; }, backInOut: function (k) { var s = 1.70158 * 1.525; if ((k *= 2) < 1) { return 0.5 * (k * k * ((s + 1) * k - s)); } return 0.5 * ((k -= 2) * k * ((s + 1) * k + s) + 2); }, // 创建弹跳效果 bounceIn: function (k) { return 1 - easingFuncs.bounceOut(1 - k); }, bounceOut: function (k) { if (k < (1 / 2.75)) { return 7.5625 * k * k; } else if (k < (2 / 2.75)) { return 7.5625 * (k -= (1.5 / 2.75)) * k + 0.75; } else if (k < (2.5 / 2.75)) { return 7.5625 * (k -= (2.25 / 2.75)) * k + 0.9375; } else { return 7.5625 * (k -= (2.625 / 2.75)) * k + 0.984375; } }, bounceInOut: function (k) { if (k < 0.5) { return easingFuncs.bounceIn(k * 2) * 0.5; } return easingFuncs.bounceOut(k * 2 - 1) * 0.5 + 0.5; } }; var N_POINT = 30; var grids = []; var xAxes = []; var yAxes = []; var series = []; var titles = []; var count = 0; echarts.util.each(easingFuncs, function (easingFunc, name) { var data = []; for (var i = 0; i <= N_POINT; i++) { var x = i / N_POINT; var y = easingFunc(x); data.push([x, y]); } grids.push({ show: true, borderWidth: 0, backgroundColor: '#fff', shadowColor: 'rgba(0, 0, 0, 0.3)', shadowBlur: 2 }); xAxes.push({ type: 'value', show: false, min: 0, max: 1, gridIndex: count }); yAxes.push({ type: 'value', show: false, min: -0.4, max: 1.4, gridIndex: count }); series.push({ name: name, type: 'line', xAxisIndex: count, yAxisIndex: count, data: data, showSymbol: false, animationEasing: name, animationDuration: 1000 }); titles.push({ textAlign: 'center', text: name, textStyle: { fontSize: 12, fontWeight: 'normal' } }); count++; }); var rowNumber = Math.ceil(Math.sqrt(count)); echarts.util.each(grids, function (grid, idx) { grid.left = ((idx % rowNumber) / rowNumber * 100 + 0.5) + '%'; grid.top = (Math.floor(idx / rowNumber) / rowNumber * 100 + 0.5) + '%'; grid.width = (1 / rowNumber * 100 - 1) + '%'; grid.height = (1 / rowNumber * 100 - 1) + '%'; titles[idx].left = parseFloat(grid.left) + parseFloat(grid.width) / 2 + '%'; titles[idx].top = parseFloat(grid.top) + '%'; }); option = { title: titles.concat([{ text: 'Different Easing Functions', top: 'bottom', left: 'center' }]), grid: grids, xAxis: xAxes, yAxis: yAxes, series: series };

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