ASP.NET Coreでグラフを描いた（その２）

前回のグラフの背景に血圧値の目安線をグラデーションで描いてみた。

Chart.helpers.extendを使って、canvasに描画すればいいらしい。

@page
@model healthAPI.Pages.GraphModel
@using System.Data;
@{
    var XLabels = Newtonsoft.Json.JsonConvert.SerializeObject(Model.BloodList.Select(x => x.Date).ToList());
    var YValuesMax = Newtonsoft.Json.JsonConvert.SerializeObject(Model.BloodList.Select(x => x.Max).ToList());
    var YValuesMin = Newtonsoft.Json.JsonConvert.SerializeObject(Model.BloodList.Select(x => x.Min).ToList());
    var YValuesWeight = Newtonsoft.Json.JsonConvert.SerializeObject(Model.BloodList.Select(x => x.Weight).ToList());

    ViewData["Title"] = "Graph";
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Graph</title>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.bundle.min.js"></script>
    <script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
</head>
<body>
    <br />
    <form method="post" asp-page-handler="Refreash" >
        <input type="date" name="fromDate" asp-for="@Model.FromDate"/>～ <input type="date" name="toDate"  asp-for="@Model.ToDate"/>
        <input type="image" src="~/images/reload.png" align="center" height="22" width="26"/>
    </form>
    <p>
        <h2>血圧グラフ</h2>
    </p>
    <div class="box-body">
        <div class="chart-container">
            <canvas id="chart" style="width:100%; height:500px"></canvas>
        </div>
    </div>
    <p>
        <h2>体重グラフ</h2>
    </p>
    <div class="box-body">
        <div class="chart-container">
            <canvas id="chart2" style="width:100%; height:500px"></canvas>
        </div>
    </div>
</body>
</html>

<script type="text/javascript">
    $(function () {
        var chartName = "chart";
        var ctx = document.getElementById(chartName).getContext('2d');
        var data = {
            labels: @Html.Raw(XLabels),
            datasets: [{
                label: "最高血圧",
                backgroundColor: 'rgba(255, 255, 255, 0)',
                fill: false,
                borderColor: 'rgba(255,0,0,1)',
                borderWidth: 1,
                data: @Html.Raw(YValuesMax),
                spanGaps: true,// データが無い線を連結
                tension: 0,//カーブした線じゃない
                pointRadius: 3,// 点の大きさ
                pointBackgroundColor: 'rgba(255, 0, 0, 1)'// 点の色

            },
            {
                label: "最低血圧",
                backgroundColor: 'rgba(255, 255, 255, 0)',
                fill: false,
                borderColor: 'rgba(0,0,255,1)',
                borderWidth: 1,
                data: @Html.Raw(YValuesMin),
                spanGaps: true,
                tension: 0,
                pointRadius: 3,
                pointBackgroundColor: 'rgba(0, 0, 255, 1)'
                }],
            yHighlightRange1: {
                begin: 125,
                end: 135
            },
            yHighlightRange2: {
                begin: 75,
                end: 85
            },
        };

        var options = {
            maintainAspectRatio: false,
            scales: {
                yAxes: [{
                    ticks: {
                        max: 190,
                        min: 50,
                        beginAtZero: false,
                        stepSize: 20
                    },
                    gridLines: {
                        display: true,
                        color: "rgba(0,0,0,0.2)"
                    }
                }]             
            }
        };

        var originalLineDraw = Chart.controllers.line.prototype.draw;
        Chart.helpers.extend(Chart.controllers.line.prototype, {
            draw: function () {
                var chart = this.chart;

                var yHighlightRange1 = chart.config.data.yHighlightRange1;
                if (yHighlightRange1 !== undefined) {
                    var ctx = chart.chart.ctx;

                    var xaxis = chart.scales['x-axis-0'];
                    var yaxis = chart.scales['y-axis-0'];

                    var yRange1Begin = yHighlightRange1.begin;
                    var yRange1End = yHighlightRange1.end;
                    var yRange1BeginPixel = yaxis.getPixelForValue(yRange1Begin);
                    var yRange1EndPixel = yaxis.getPixelForValue(yRange1End);

                    var grad = ctx.createLinearGradient(xaxis.left, Math.min(yRange1BeginPixel, yRange1EndPixel), xaxis.left, Math.max(yRange1BeginPixel, yRange1EndPixel));
                    grad.addColorStop(0, 'rgba(100, 149, 237, 0.2)');
                    grad.addColorStop(1, 'rgba(135, 206, 250, 0.2)');
 
                    ctx.save();
                    ctx.fillStyle = grad;
                    ctx.fillRect(xaxis.left, Math.min(yRange1BeginPixel, yRange1EndPixel), xaxis.right - xaxis.left, Math.max(yRange1BeginPixel, yRange1EndPixel) - Math.min(yRange1BeginPixel, yRange1EndPixel));
                    ctx.restore();
                }

                var yHighlightRange2 = chart.config.data.yHighlightRange2;
                if (yHighlightRange2 !== undefined) {
                    var ctx = chart.chart.ctx;

                    var xaxis = chart.scales['x-axis-0'];
                    var yaxis = chart.scales['y-axis-0'];

                    var yRange2Begin = yHighlightRange2.begin;
                    var yRange2End = yHighlightRange2.end;
                    var yRange2BeginPixel = yaxis.getPixelForValue(yRange2Begin);
                    var yRange2EndPixel = yaxis.getPixelForValue(yRange2End);

                    var grad = ctx.createLinearGradient(xaxis.left, Math.min(yRange2BeginPixel, yRange2EndPixel), xaxis.left, Math.max(yRange2BeginPixel, yRange2EndPixel));
                    grad.addColorStop(0, 'rgba(100, 149, 237, 0.2)');
                    grad.addColorStop(1, 'rgba(135, 206, 250, 0.2)');

                    ctx.save();
                    ctx.fillStyle = grad;
                    ctx.fillRect(xaxis.left, Math.min(yRange2BeginPixel, yRange2EndPixel), xaxis.right - xaxis.left, Math.max(yRange2BeginPixel, yRange2EndPixel) - Math.min(yRange2BeginPixel, yRange2EndPixel));
                    ctx.restore();
                }

                originalLineDraw.apply(this, arguments);
            }
        });

        var myChart = new Chart(ctx, {
            options: options,
            data: data,
            type: 'line'
        });

        /////////////////////////

        var chartName2 = "chart2";
        var ctx2 = document.getElementById(chartName2).getContext('2d');
        var data2 = {
            labels: @Html.Raw(XLabels),
            datasets: [{
                label: "体重",
                backgroundColor: 'rgba(255, 255, 255, 0)',
                borderColor: 'rgba(0,127,0,1)',
                fill: false,
                borderWidth: 1,
                data: @Html.Raw(YValuesWeight),
                spanGaps: true,
                tension: 0,
                pointRadius: 3,
                pointBackgroundColor: 'rgba(0, 127, 0, 1)'
            }]
        };

        var options2 = {
            maintainAspectRatio: false,
            scales: {
                yAxes: [{
                    ticks: {
                        max: ヒミツ,
                        min: ヒミツ,
                        beginAtZero: false,
                        stepSize: 10
                    },
                    gridLines: {
                        display: true,
                        color: "rgba(0,0,0,0.2)"
                    }
                }]
            }
        };

        var myChart2 = new Chart(ctx2, {
            options: options2,
            data: data2,
            type: 'line'
        });
    });
</script>

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@page

@model healthAPI.Pages.GraphModel

@using System.Data;

var XLabels = Newtonsoft.Json.JsonConvert.SerializeObject(Model.BloodList.Select(x => x.Date).ToList());

var YValuesMax = Newtonsoft.Json.JsonConvert.SerializeObject(Model.BloodList.Select(x => x.Max).ToList());

var YValuesMin = Newtonsoft.Json.JsonConvert.SerializeObject(Model.BloodList.Select(x => x.Min).ToList());

var YValuesWeight = Newtonsoft.Json.JsonConvert.SerializeObject(Model.BloodList.Select(x => x.Weight).ToList());

ViewData["Title"] = "Graph";

}

<!DOCTYPE html>

<html>

<head>

<title>Graph</title>

</head>

<body>

<br />

</form>

<p>

<h2>血圧グラフ</h2>

</p>

</div>

<p>

<h2>体重グラフ</h2>

</p>

</div>

</body>

</html>

$(function () {

var chartName = "chart";

var ctx = document.getElementById(chartName).getContext('2d');

var data = {

labels: @Html.Raw(XLabels),

datasets: [{

label: "最高血圧",

backgroundColor: 'rgba(255, 255, 255, 0)',

fill: false,

borderColor: 'rgba(255,0,0,1)',

borderWidth: 1,

data: @Html.Raw(YValuesMax),

spanGaps: true,// データが無い線を連結

tension: 0,//カーブした線じゃない

pointRadius: 3,// 点の大きさ

pointBackgroundColor: 'rgba(255, 0, 0, 1)'// 点の色

{

label: "最低血圧",

backgroundColor: 'rgba(255, 255, 255, 0)',

fill: false,

borderColor: 'rgba(0,0,255,1)',

borderWidth: 1,

data: @Html.Raw(YValuesMin),

spanGaps: true,

tension: 0,

pointRadius: 3,

pointBackgroundColor: 'rgba(0, 0, 255, 1)'

}],

yHighlightRange1: {

begin: 125,

end: 135

yHighlightRange2: {

begin: 75,

end: 85

};

var options = {

maintainAspectRatio: false,

scales: {

yAxes: [{

ticks: {

max: 190,

min: 50,

beginAtZero: false,

stepSize: 20

gridLines: {

display: true,

color: "rgba(0,0,0,0.2)"

}

}]

}

};

var originalLineDraw = Chart.controllers.line.prototype.draw;

Chart.helpers.extend(Chart.controllers.line.prototype, {

draw: function () {

var chart = this.chart;

var yHighlightRange1 = chart.config.data.yHighlightRange1;

if (yHighlightRange1 !== undefined) {

var ctx = chart.chart.ctx;

var xaxis = chart.scales['x-axis-0'];

var yaxis = chart.scales['y-axis-0'];

var yRange1Begin = yHighlightRange1.begin;

var yRange1End = yHighlightRange1.end;

var yRange1BeginPixel = yaxis.getPixelForValue(yRange1Begin);

var yRange1EndPixel = yaxis.getPixelForValue(yRange1End);

var grad = ctx.createLinearGradient(xaxis.left, Math.min(yRange1BeginPixel, yRange1EndPixel), xaxis.left, Math.max(yRange1BeginPixel, yRange1EndPixel));

grad.addColorStop(0, 'rgba(100, 149, 237, 0.2)');

grad.addColorStop(1, 'rgba(135, 206, 250, 0.2)');

ctx.save();

ctx.fillStyle = grad;

ctx.fillRect(xaxis.left, Math.min(yRange1BeginPixel, yRange1EndPixel), xaxis.right - xaxis.left, Math.max(yRange1BeginPixel, yRange1EndPixel) - Math.min(yRange1BeginPixel, yRange1EndPixel));

ctx.restore();

}

var yHighlightRange2 = chart.config.data.yHighlightRange2;

if (yHighlightRange2 !== undefined) {

var ctx = chart.chart.ctx;

var xaxis = chart.scales['x-axis-0'];

var yaxis = chart.scales['y-axis-0'];

var yRange2Begin = yHighlightRange2.begin;

var yRange2End = yHighlightRange2.end;

var yRange2BeginPixel = yaxis.getPixelForValue(yRange2Begin);

var yRange2EndPixel = yaxis.getPixelForValue(yRange2End);

var grad = ctx.createLinearGradient(xaxis.left, Math.min(yRange2BeginPixel, yRange2EndPixel), xaxis.left, Math.max(yRange2BeginPixel, yRange2EndPixel));

grad.addColorStop(0, 'rgba(100, 149, 237, 0.2)');

grad.addColorStop(1, 'rgba(135, 206, 250, 0.2)');

ctx.save();

ctx.fillStyle = grad;

ctx.fillRect(xaxis.left, Math.min(yRange2BeginPixel, yRange2EndPixel), xaxis.right - xaxis.left, Math.max(yRange2BeginPixel, yRange2EndPixel) - Math.min(yRange2BeginPixel, yRange2EndPixel));

ctx.restore();

}

originalLineDraw.apply(this, arguments);

}

});

var myChart = new Chart(ctx, {

options: options,

data: data,

type: 'line'

});

/////////////////////////

var chartName2 = "chart2";

var ctx2 = document.getElementById(chartName2).getContext('2d');

var data2 = {

labels: @Html.Raw(XLabels),

datasets: [{

label: "体重",

backgroundColor: 'rgba(255, 255, 255, 0)',

borderColor: 'rgba(0,127,0,1)',

fill: false,

borderWidth: 1,

data: @Html.Raw(YValuesWeight),

spanGaps: true,

tension: 0,

pointRadius: 3,

pointBackgroundColor: 'rgba(0, 127, 0, 1)'

}]

};

var options2 = {

maintainAspectRatio: false,

scales: {

yAxes: [{

ticks: {

max: ヒミツ,

min: ヒミツ,

beginAtZero: false,

stepSize: 10

gridLines: {

display: true,

color: "rgba(0,0,0,0.2)"

}

}]

}

};

var myChart2 = new Chart(ctx2, {

options: options2,

data: data2,

type: 'line'

});

</script>

なかなか良い。(o^-‘)b グッ!

—

参考サイト

https://stackoverflow.com/questions/36685745/acceptable-range-highlighting-of-background-in-chart-js-2-0

http://www.html5.jp/canvas/how4.html

blog

ASP.NET Coreでグラフを描いた（その２）

いいね:

2018年9月
日	月	火	水	木	金	土
						1
2	3	4	5	6	7	8
9	10	11	12	13	14	15
16	17	18	19	20	21	22
23	24	25	26	27	28	29
30

ASP.NET Coreでグラフを描いた（その２）

共有:

いいね: