Chart.js 中折线图中的交点? [英] Intersection point in line graph in Chart.js?
本文介绍了Chart.js 中折线图中的交点?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
对此进行了大量搜索，但基于chart.js 没有得到任何答案.我已经问过这个问题
var config = {类型:'酒吧'，数据: {标签:[第 0 年"、第 1 年"、第 2 年"、第 3 年"、第 4 年"、第 5 年"、第 6 年"]，数据集:[{类型:'线'，标签:'成本',数据:[150, 15, 25, 14, 10, 7],边框颜色:'#E35500'，填充:假，线张力:0，borderJoinStyle: '斜接',}, {类型:'线'，标签:'现金流'，数据:[20, 180, 170, 220, 160, 190],边框颜色:'#FFC000'，填充:假，线张力:0，borderJoinStyle: '斜接',x轴:[{bar百分比:0.4}]},{类型:'线'，标签:'累积流量',数据:[0, -10, 20, 30, 40, 50],边框颜色:'红色'，填充:假，线张力:0，borderJoinStyle: '斜接',x轴:[{bar百分比:0.4}]}, {类型:'酒吧'，标签:'Benifit(一次)'，背景颜色:#005998"，数据:[40, 50, 60, 80, 50, 60],}, {类型:'酒吧'，label: 'Benifit(Recurring)',背景颜色:#0FAAFF"，数据:[120, 150, 150, 180, 120, 140],}]},选项: {标题: {显示:真实，text: '自定义图表标题'},尺度:{x轴:[{时间: {显示格式:{季度:'YYYY'}},堆叠:真实，beginAtZero: 真,bar百分比:0.3，id: 'x 轴标签',位置:'底部'，scaleStartValue: 20,网格线: {显示:假},}],y轴:[{堆叠:真实，id: 'y 轴标签',刻度:{最大:300，分钟:-50，步长:50，},位置:'左'，网格线: {显示:假},}]},传奇: {位置:'正确'},保持纵横比:假，scaleBeginAtZero: 真}};var ctx = document.getElementById("myChart").getContext("2d");new Chart(ctx, config);.GraphContain {最大高度:500px；位置:相对；}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script><script src="http://cdnjs.cloudflare.com/ajax/libs/moment.js/2.17.0/moment.js"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.bundle.js"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.min.js"></script><div class="GraphContain"><canvas id="myChart" width="400" height="400"></canvas>有人知道吗??需要这方面的天才！！！
解决方案
我们来了 )))
https://jsfiddle.net/Falseclock/5nbecn0z/
如果你需要显示与X轴的交点，那么只需模仿Y=0的线https://jsfiddle.net/Falseclock/8g0ucdb1/
var ORDER_STATS = {"2016" : [10, 181, 194, -56, 130, 181, 179, 189, 30, 60, 193, 154],"2015" : [124, -50, 152, 187, 10, 164, 129, -16, 115, 119, 129, 171],"2014" : [-90, 80, 30, 59, 100, -30, 60, 116, 191, 181, -60, 106]};var 颜色 = ['206,191,26','119,206,26','26,200,206','236,124,98','206,26,140','26,77,206'];//定义 Xvar 订单图表数据 = {标签:[Jan"、Feb"、Mar"、Apr"、May"、Jun"、Jul"、Aug"、Sep"、Oct"、Nov"、Dec"],数据集:[]}Object.keys(ORDER_STATS).forEach(function (key) {颜色 = 颜色.shift();ordersChartData.datasets.push({标签:钥匙，线张力:0，类型:'线'，backgroundColor: "rgba("+color+",0.1)",borderColor: "rgba("+color+",1)",边框宽度:2，pointBackgroundColor : "rgba("+color+",1)",pointBorderColor: "#fff",点边框宽度:1，点半径:4，pointHoverBackgroundColor : "#fff",pointHoverBorderColor: "rgba("+color+",1)",点悬停边框宽度:1，数据:ORDER_STATS[key]});});var ctx = document.getElementById("myChart").getContext("2d");Chart.defaults.global.defaultFontColor = '灰色';Chart.defaults.global.defaultFontFamily = "Tahoma";Chart.defaults.global.defaultFontSize = 11;Chart.defaults.global.defaultFontStyle = 'normal';var myChart = 新图表(ctx，{类型:'线'，数据:订单图表数据，默认字体大小:11，选项: {响应:真实，标题: {显示:真实，text: '交叉点实现',fontColor: "#444",fontFamily: 'Tahoma',填充:0},传奇: {显示:真实，标签: {fontColor: '灰色',usePointStyle: 真}},工具提示:{模式:索引"，相交:真实，位置:'最近'，车身间距:4}}});Chart.plugins.register({afterDatasetsDraw:函数(图表实例，缓动){var Y = chartInstance.scales['y-axis-0'];var X = chartInstance.scales['x-axis-0'];zeroPointY = Y.top + ((Y.bottom - Y.top)/(Y.ticks.length -1) * Y.zeroLineIndex);zeroPointX = Y.right;yScale = (Y.bottom - Y.top)/(Y.end - Y.start);xScale = (X.right - X.left)/(X.ticks.length - 1);var intersects = findIntersects(ORDER_STATS['2015'], ORDER_STATS['2014']);var context = chartInstance.chart.ctx;intersects.forEach(函数(结果，idx){context.fillStyle = '红色';context.beginPath();context.arc((result.x * xScale) + zeroPointX, (Y.end - Y.start) - (result.y * yScale) - ((Y.end - Y.start) - zeroPointY), 3, 0,2 * Math.PI, 真);上下文填充()；});}});函数 findIntersects(line1, line2){var 相交 = [];line1.forEach(function(val,idx) {var line1StartX = idx;var line1StartY = line1[idx];var line1EndX = idx + 1;var line1EndY = line1[idx + 1];var line2StartX = idx;var line2StartY = line2[idx];var line2EndX = idx + 1;var line2EndY = line2[idx+1];结果 = checkLineIntersection(line1StartX, line1StartY, line1EndX, line1EndY, line2StartX, line2StartY, line2EndX, line2EndY);如果(result.onLine1 && result.onLine2){相交.推(结果)；}});返回相交；}函数 checkLineIntersection(line1StartX, line1StartY, line1EndX, line1EndY, line2StartX, line2StartY, line2EndX, line2EndY) {//如果线相交，则结果包含交点的 x 和 y(将线视为无限)以及线段 1 或线段 2 是否包含该点的布尔值var 分母，a，b，numerator1，numerator2，结果 = {x:空，y:空，在线 1:假，在线 2:假};分母 = ((line2EndY - line2StartY) * (line1EndX - line1StartX)) - ((line2EndX - line2StartX) * (line1EndY - line1StartY));如果(分母 == 0){返回结果；}a = line1StartY - line2StartY;b = line1StartX - line2StartX;numerator1 = ((line2EndX - line2StartX) * a) - ((line2EndY - line2StartY) * b);numerator2 = ((line1EndX - line1StartX) * a) - ((line1EndY - line1StartY) * b);a = numerator1/分母；b = numerator2/分母；//如果我们在两个方向上无限地投射这些线，它们会在这里相交:result.x = line1StartX + (a * (line1EndX - line1StartX));result.y = line1StartY + (a * (line1EndY - line1StartY));/*//值得注意的是，这应该与:x = line2StartX + (b * (line2EndX - line2StartX));y = line2StartX + (b * (line2EndY - line2StartY));*///如果 line1 是一个线段而 line2 是无限的，它们相交如果:如果 (a > 0 && a < 1) {结果.onLine1 = true;}//如果 line2 是一个线段而 line1 是无限的，它们相交如果:如果 (b > 0 && b < 1) {结果.onLine2 = true;}//如果 line1 和 line2 是线段，如果以上都为真，它们相交返回结果；};<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.js"></script><canvas id="myChart" width="650" height="241" style="display: block; width: 650px; height: 241px;"></canvas>Searched a lot about this but din't got any answer on this based on chart.js. I had already asked this question here in which I was using highchart.js and got the solution but now I am using chart.js library and trying to find the solution. Below is my code I have tried. I need to find the intersection point between these 2 line graphs combo. See the Graph Image .
var config = {
type: 'bar',
data: {
labels: ["Year 0", "Year 1", "Year 2", "Year 3", "Year 4", "Year 5", "Year 6"],
datasets: [{
type: 'line',
label: 'Cost',
data: [150, 15, 25, 14, 10, 7],
borderColor: '#E35500',
fill: false,
lineTension: 0,
borderJoinStyle: 'miter',
}, {
type: 'line',
label: 'Cash Flow',
data: [20, 180, 170, 220, 160, 190],
borderColor: '#FFC000',
fill: false,
lineTension: 0,
borderJoinStyle: 'miter',
xAxes: [{
barPercentage: 0.4
}]
},
{
type: 'line',
label: 'Accumulative Flow',
data: [0, -10, 20, 30, 40, 50],
borderColor: 'red',
fill: false,
lineTension: 0,
borderJoinStyle: 'miter',
xAxes: [{
barPercentage: 0.4
}]
}, {
type: 'bar',
label: 'Benifit(One time)',
backgroundColor: "#005998",
data: [40, 50, 60, 80, 50, 60],
}, {
type: 'bar',
label: 'Benifit(Recurring)',
backgroundColor: "#0FAAFF",
data: [120, 150, 150, 180, 120, 140],
}
]
},
options: {
title: {
display: true,
text: 'Custom Chart Title'
},
scales: {
xAxes: [{
time: {
displayFormats: {
quarter: ' YYYY'
}
},
stacked: true,
beginAtZero: true,
barPercentage: 0.3,
id: 'x-axis-label',
position: 'bottom',
scaleStartValue: 20,
gridLines: {
display: false
},
}],
yAxes: [{
stacked: true,
id: 'y-axis-label',
ticks: {
max: 300,
min: -50,
stepSize: 50,
},
position: 'left',
gridLines: {
display: false
},
}]
},
legend: {
position: 'right'
},
maintainAspectRatio: false,
scaleBeginAtZero: true
}
};
var ctx = document.getElementById("myChart").getContext("2d");
new Chart(ctx, config);
.GraphContain {
max-height: 500px;
position: relative;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/moment.js/2.17.0/moment.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.bundle.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.min.js"></script>
<div class="GraphContain">
<canvas id="myChart" width="400" height="400"></canvas>
</div>
Anyone having any idea?? need a genius on this!!!
解决方案
Here we are )))
https://jsfiddle.net/Falseclock/5nbecn0z/
If you need to show intersections with X axis, then just imitate line with Y=0 https://jsfiddle.net/Falseclock/8g0ucdb1/
var ORDER_STATS = {
"2016" : [10, 181, 194, -56, 130, 181, 179, 189, 30, 60, 193, 154],
"2015" : [124, -50, 152, 187, 10, 164, 129, -16, 115, 119, 129, 171],
"2014" : [-90, 80, 30, 59, 100, -30, 60, 116, 191, 181, -60, 106]
};
var colors = ['206,191,26','119,206,26','26,200,206','236,124,98','206,26,140','26,77,206'];
// Definning X
var ordersChartData = {
labels : ["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"],
datasets : []
}
Object.keys(ORDER_STATS).forEach(function (key) {
color = colors.shift();
ordersChartData.datasets.push(
{
label: key,
lineTension: 0,
type: 'line',
backgroundColor: "rgba("+color+",0.1)",
borderColor: "rgba("+color+",1)",
borderWidth: 2,
pointBackgroundColor : "rgba("+color+",1)",
pointBorderColor: "#fff",
pointBorderWidth: 1,
pointRadius: 4,
pointHoverBackgroundColor : "#fff",
pointHoverBorderColor: "rgba("+color+",1)",
pointHoverBorderWidth: 1,
data : ORDER_STATS[key]
}
);
});
var ctx = document.getElementById("myChart").getContext("2d");
Chart.defaults.global.defaultFontColor = 'grey';
Chart.defaults.global.defaultFontFamily = "Tahoma";
Chart.defaults.global.defaultFontSize = 11;
Chart.defaults.global.defaultFontStyle = 'normal';
var myChart = new Chart(ctx, {
type: 'line',
data: ordersChartData,
defaultFontSize: 11,
options: {
responsive: true,
title: {
display: true,
text: 'Intersection realization',
fontColor: "#444",
fontFamily: 'Tahoma',
padding: 0
},
legend: {
display: true,
labels: {
fontColor: 'grey',
usePointStyle: true
}
},
tooltips: {
mode: "index",
intersect: true,
position: 'nearest',
bodySpacing: 4
}
}
});
Chart.plugins.register({
afterDatasetsDraw: function(chartInstance, easing) {
var Y = chartInstance.scales['y-axis-0'];
var X = chartInstance.scales['x-axis-0'];
zeroPointY = Y.top + ((Y.bottom - Y.top) / (Y.ticks.length -1) * Y.zeroLineIndex);
zeroPointX = Y.right;
yScale = (Y.bottom - Y.top) / (Y.end - Y.start);
xScale = (X.right - X.left) / (X.ticks.length - 1);
var intersects = findIntersects(ORDER_STATS['2015'], ORDER_STATS['2014'] );
var context = chartInstance.chart.ctx;
intersects.forEach(function (result, idx) {
context.fillStyle = 'red';
context.beginPath();
context.arc((result.x * xScale) + zeroPointX, (Y.end - Y.start) - (result.y * yScale) - ((Y.end - Y.start) - zeroPointY), 3, 0, 2 * Math.PI, true);
context.fill();
});
}
});
function findIntersects(line1, line2)
{
var intersects = [];
line1.forEach(function(val,idx) {
var line1StartX = idx;
var line1StartY = line1[idx];
var line1EndX = idx + 1;
var line1EndY = line1[idx + 1];
var line2StartX = idx;
var line2StartY = line2[idx];
var line2EndX = idx + 1;
var line2EndY = line2[idx+1];
result = checkLineIntersection(line1StartX, line1StartY, line1EndX, line1EndY, line2StartX, line2StartY, line2EndX, line2EndY);
if (result.onLine1 && result.onLine2) {
intersects.push(result);
}
});
return intersects;
}
function checkLineIntersection(line1StartX, line1StartY, line1EndX, line1EndY, line2StartX, line2StartY, line2EndX, line2EndY) {
// if the lines intersect, the result contains the x and y of the intersection (treating the lines as infinite) and booleans for whether line segment 1 or line segment 2 contain the point
var denominator, a, b, numerator1, numerator2, result = {
x: null,
y: null,
onLine1: false,
onLine2: false
};
denominator = ((line2EndY - line2StartY) * (line1EndX - line1StartX)) - ((line2EndX - line2StartX) * (line1EndY - line1StartY));
if (denominator == 0) {
return result;
}
a = line1StartY - line2StartY;
b = line1StartX - line2StartX;
numerator1 = ((line2EndX - line2StartX) * a) - ((line2EndY - line2StartY) * b);
numerator2 = ((line1EndX - line1StartX) * a) - ((line1EndY - line1StartY) * b);
a = numerator1 / denominator;
b = numerator2 / denominator;
// if we cast these lines infinitely in both directions, they intersect here:
result.x = line1StartX + (a * (line1EndX - line1StartX));
result.y = line1StartY + (a * (line1EndY - line1StartY));
/*
// it is worth noting that this should be the same as:
x = line2StartX + (b * (line2EndX - line2StartX));
y = line2StartX + (b * (line2EndY - line2StartY));
*/
// if line1 is a segment and line2 is infinite, they intersect if:
if (a > 0 && a < 1) {
result.onLine1 = true;
}
// if line2 is a segment and line1 is infinite, they intersect if:
if (b > 0 && b < 1) {
result.onLine2 = true;
}
// if line1 and line2 are segments, they intersect if both of the above are true
return result;
};
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.js"></script>
<canvas id="myChart" width="650" height="241" style="display: block; width: 650px; height: 241px;"></canvas>
这篇关于Chart.js 中折线图中的交点?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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