OpenLayersで地図の印刷を行う

はじめに

前回は、DevExpress社のASPxDocumentViewerクラスを利用しOpenLayersの地図の印刷処理を作成したが、任意の位置に地図が動かせないため、javascriptベースに、印刷処理を実装してみた。

処理概要は以下の通り

印刷ボタンクリックの際、印刷プレビュー画面を表示させる。
印刷プレビュー画面では、画面表示時に、OpenLayersのmapオブジェクトを再度作成し、地図を動かせるようにした。

PrintDialog.ascx

印刷プレビュー画面では、ol-extのPrintDialogクラスを参考にしたが、PrintDialogの画面ではなくは、DevExpress社のASPxPopupControlクラスを利用する。

<dx:ASPxCallbackPanel ID="CallbackPrint" runat="server" HideContentOnCallback="False"
    ClientInstanceName="CallbackPrint" OnCallback="OnCallbackPrint">
    <ClientSideEvents EndCallback="OnEndCallbackPrint"></ClientSideEvents>
    <PanelCollection>
        <dx:PanelContent ID="PanelContent20" runat="server">
            <dx:ASPxPopupControl ID="PrintPopup" ClientInstanceName="PrintPopup" runat="server"
                Height="400px" Width="975px" ScrollBars="Auto" AllowResize="True"
                CloseAction="CloseButton" CloseOnEscape="False"
                PopupHorizontalAlign="WindowCenter" PopupVerticalAlign="WindowCenter"
                HeaderText="印刷プレビュー" AllowDragging="True" PopupAnimationType="None" EnableViewState="False"
                AutoUpdatePosition="True"
                Theme="Moderno" ShowFooter="True">
                <ClientSideEvents Shown="OnShownPrint" Resize="OnResizePrint"></ClientSideEvents>
                <ContentStyle HorizontalAlign="Center" VerticalAlign="Top">
                    <Paddings Padding="0px" />
                </ContentStyle>
                <ContentCollection>
                    <dx:PopupControlContentControl runat="server">
                        <dx:ASPxRibbon ID="RibbonPrint" ClientInstanceName="RibbonPrint" runat="server"
                            Theme="Moderno" Width="100%" AllowMinimize="False" 
                            ShowFileTab="False" ShowTabs="False"
                            CssClass="ribbon-style">
                            <Tabs>
                                <dx:RibbonTab Name="rtPrint" Text="ホーム">
                                    <Groups>
                                        <dx:RibbonGroup Name="rgPrint" Text="印刷">
                                            <Items>
                                                <dx:RibbonButtonItem Name="rbiMapPrint" Text="印刷" Size="Large">
                                                    <LargeImage IconID="print_printer_32x32">
                                                    </LargeImage>
                                                    <SmallImage IconID="print_print_16x16">
                                                    </SmallImage>
                                                </dx:RibbonButtonItem>
                                            </Items>
                                        </dx:RibbonGroup>
                                        <dx:RibbonGroup Name="rgPage" Text="ページ設定">
                                            <Items>
                                                <dx:RibbonDropDownButtonItem Name="rddbiPaperKind" Size="Large" Text="用紙種別">
                                                    <Items>
                                                        <dx:RibbonDropDownToggleButtonItem Name="rddtbiA4" Text="A4" Checked="True">
                                                        </dx:RibbonDropDownToggleButtonItem>
                                                        <dx:RibbonDropDownToggleButtonItem Name="rddtbiA3" Text="A3">
                                                        </dx:RibbonDropDownToggleButtonItem>
                                                    </Items>
                                                    <LargeImage IconID="pages_papersize_32x32">
                                                    </LargeImage>
                                                </dx:RibbonDropDownButtonItem>
                                                <dx:RibbonDropDownButtonItem Name="rddbiPageOrientation" Size="Large" Text="印刷の向き" BeginGroup="true">
                                                    <Items>
                                                        <dx:RibbonDropDownToggleButtonItem Name="rddtbiLandscape" Text="横" >
                                                        </dx:RibbonDropDownToggleButtonItem>
                                                        <dx:RibbonDropDownToggleButtonItem Name="rddtbiPortrait" Text="縦" Checked="True">
                                                        </dx:RibbonDropDownToggleButtonItem>
                                                    </Items>
                                                    <LargeImage IconID="pages_pageorientation_32x32">
                                                    </LargeImage>
                                                </dx:RibbonDropDownButtonItem>
                                                <dx:RibbonDropDownButtonItem Name="rddbiPagePadding" Size="Large" Text="余白">
                                                    <Items>
                                                        <dx:RibbonDropDownToggleButtonItem Checked="True" Name="rddtbiNone" Text="余白なし">
                                                        </dx:RibbonDropDownToggleButtonItem>
                                                        <dx:RibbonDropDownToggleButtonItem Name="rddtbiSmall" Text="余白(5mm)">
                                                        </dx:RibbonDropDownToggleButtonItem>
                                                        <dx:RibbonDropDownToggleButtonItem Name="rddtbiLarge" Text="余白(10mm)">
                                                        </dx:RibbonDropDownToggleButtonItem>
                                                    </Items>
                                                    <LargeImage IconID="pages_pagemargins_32x32">
                                                    </LargeImage>
                                                </dx:RibbonDropDownButtonItem>
                                            </Items>
                                        </dx:RibbonGroup>
                                        <dx:RibbonGroup Name="rgReport" Text="レポート設定">
                                            <Items>
                                                <dx:RibbonTextBoxItem Name="rtbiReportTitle" ToolTip="タイトル" Text="タイトル"  >
                                                    <PropertiesTextBox Width="150px" NullText="タイトル"></PropertiesTextBox>
                                                </dx:RibbonTextBoxItem>
                                                <dx:RibbonComboBoxItem Name="rbiScale"　Text="縮尺" >
                                                    <PropertiesComboBox NullText="縮尺"></PropertiesComboBox>
                                                    <Items>
                                                        <dx:ListEditItem Text="1:1000000" Value="1000000" />
                                                        <dx:ListEditItem Text="1:500000" Value="500000" />
                                                        <dx:ListEditItem Text="1:250000" Value="250000" />
                                                        <dx:ListEditItem Text="1:100000" Value="100000" />
                                                        <dx:ListEditItem Text="1:50000" Value="50000" />
                                                        <dx:ListEditItem Text="1:25000" Value="25000" />
                                                        <dx:ListEditItem Text="1:10000" Value="10000" />
                                                        <dx:ListEditItem Text="1:5000" Value="5000" />
                                                        <dx:ListEditItem Text="1:2500" Value="2500" />
                                                        <dx:ListEditItem Text="1:1000" Value="1000" />
                                                        <dx:ListEditItem Text="1:500" Value="500" />
                                                    </Items>
                                                </dx:RibbonComboBoxItem>
                                                <dx:RibbonToggleButtonItem Name="rtbiReportLegend" Text="凡例" Size="Small">
                                                    <LargeImage IconID="chart_chartsshowlegend_32x32">
                                                    </LargeImage>
                                                    <SmallImage IconID="chart_chartsshowlegend_16x16">
                                                    </SmallImage>
                                                </dx:RibbonToggleButtonItem>
                                                <dx:RibbonToggleButtonItem Name="rtbiReportNorth" Text="方位記号"  Size="Small">
                                                    <LargeImage IconID="navigation_navigationbar_32x32">
                                                    </LargeImage>
                                                    <SmallImage IconID="navigation_navigationbar_16x16">
                                                    </SmallImage>
                                                </dx:RibbonToggleButtonItem>
                                            </Items>
                                        </dx:RibbonGroup>
                                        <dx:RibbonGroup Name="rgExport" Text="エクスポート">
                                            <Items>
                                                <dx:RibbonDropDownButtonItem Name="rddbiReportExport" Size="Large" Text="地図出力">
                                                    <Items>
                                                        <dx:RibbonDropDownButtonItem Name="ExportPng" Size="Large" Text="Png出力">
                                                            <LargeImage IconID="export_exporttoimg_32x32">
                                                            </LargeImage>
                                                            <SmallImage IconID="export_exporttoimg_16x16">
                                                            </SmallImage>
                                                        </dx:RibbonDropDownButtonItem>
                                                    </Items>
                                                    <LargeImage IconID="export_exportfile_32x32">
                                                    </LargeImage>
                                                    <SmallImage IconID="export_exportfile_16x16">
                                                    </SmallImage>
                                                </dx:RibbonDropDownButtonItem>
                                            </Items>
                                        </dx:RibbonGroup>
                                    </Groups>
                                </dx:RibbonTab>
                            </Tabs>
                            <ClientSideEvents CommandExecuted="OnRibbonPrintButtonClick" />
                        </dx:ASPxRibbon>
                        <dx:PanelContent runat="server">
                            <div class="print-map">
                                <div class="page-map">
                                    <div id="printmap" class="printmap"></div>
                                </div>
                            </div>
                        </dx:PanelContent>
                        <dx:ASPxHiddenField runat="server" ClientInstanceName="ReportData" ID="ReportData">
                        </dx:ASPxHiddenField>
                    </dx:PopupControlContentControl>
                </ContentCollection>
            </dx:ASPxPopupControl>
        </dx:PanelContent>
    </PanelCollection>
</dx:ASPxCallbackPanel>

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<dx:ASPxCallbackPanel ID="CallbackPrint" runat="server" HideContentOnCallback="False"

ClientInstanceName="CallbackPrint" OnCallback="OnCallbackPrint">

<dx:PanelContent ID="PanelContent20" runat="server">

<dx:ASPxPopupControl ID="PrintPopup" ClientInstanceName="PrintPopup" runat="server"

Height="400px" Width="975px" ScrollBars="Auto" AllowResize="True"

CloseAction="CloseButton" CloseOnEscape="False"

PopupHorizontalAlign="WindowCenter" PopupVerticalAlign="WindowCenter"

HeaderText="印刷プレビュー" AllowDragging="True" PopupAnimationType="None" EnableViewState="False"

AutoUpdatePosition="True"

Theme="Moderno" ShowFooter="True">

</ContentStyle>

<dx:PopupControlContentControl runat="server">

<dx:ASPxRibbon ID="RibbonPrint" ClientInstanceName="RibbonPrint" runat="server"

Theme="Moderno" Width="100%" AllowMinimize="False"

ShowFileTab="False" ShowTabs="False"

CssClass="ribbon-style">

<Tabs>

<dx:RibbonTab Name="rtPrint" Text="ホーム">

<dx:RibbonGroup Name="rgPrint" Text="印刷">

<Items>

<dx:RibbonButtonItem Name="rbiMapPrint" Text="印刷" Size="Large">

</LargeImage>

</SmallImage>

</dx:RibbonButtonItem>

</Items>

</dx:RibbonGroup>

<dx:RibbonGroup Name="rgPage" Text="ページ設定">

<Items>

<dx:RibbonDropDownButtonItem Name="rddbiPaperKind" Size="Large" Text="用紙種別">

<Items>

<dx:RibbonDropDownToggleButtonItem Name="rddtbiA4" Text="A4" Checked="True">

</dx:RibbonDropDownToggleButtonItem>

<dx:RibbonDropDownToggleButtonItem Name="rddtbiA3" Text="A3">

</dx:RibbonDropDownToggleButtonItem>

</Items>

</LargeImage>

</dx:RibbonDropDownButtonItem>

<dx:RibbonDropDownButtonItem Name="rddbiPageOrientation" Size="Large" Text="印刷の向き" BeginGroup="true">

<Items>

<dx:RibbonDropDownToggleButtonItem Name="rddtbiLandscape" Text="横" >

</dx:RibbonDropDownToggleButtonItem>

<dx:RibbonDropDownToggleButtonItem Name="rddtbiPortrait" Text="縦" Checked="True">

</dx:RibbonDropDownToggleButtonItem>

</Items>

</LargeImage>

</dx:RibbonDropDownButtonItem>

<dx:RibbonDropDownButtonItem Name="rddbiPagePadding" Size="Large" Text="余白">

<Items>

<dx:RibbonDropDownToggleButtonItem Checked="True" Name="rddtbiNone" Text="余白なし">

</dx:RibbonDropDownToggleButtonItem>

<dx:RibbonDropDownToggleButtonItem Name="rddtbiSmall" Text="余白(5mm)">

</dx:RibbonDropDownToggleButtonItem>

<dx:RibbonDropDownToggleButtonItem Name="rddtbiLarge" Text="余白(10mm)">

</dx:RibbonDropDownToggleButtonItem>

</Items>

</LargeImage>

</dx:RibbonDropDownButtonItem>

</Items>

</dx:RibbonGroup>

<dx:RibbonGroup Name="rgReport" Text="レポート設定">

<Items>

<dx:RibbonTextBoxItem Name="rtbiReportTitle" ToolTip="タイトル" Text="タイトル" >

</dx:RibbonTextBoxItem>

<dx:RibbonComboBoxItem Name="rbiScale"　Text="縮尺" >

<Items>

<dx:ListEditItem Text="1:1000000" Value="1000000" />

<dx:ListEditItem Text="1:500000" Value="500000" />

<dx:ListEditItem Text="1:250000" Value="250000" />

<dx:ListEditItem Text="1:100000" Value="100000" />

<dx:ListEditItem Text="1:50000" Value="50000" />

<dx:ListEditItem Text="1:25000" Value="25000" />

<dx:ListEditItem Text="1:10000" Value="10000" />

<dx:ListEditItem Text="1:5000" Value="5000" />

<dx:ListEditItem Text="1:2500" Value="2500" />

<dx:ListEditItem Text="1:1000" Value="1000" />

<dx:ListEditItem Text="1:500" Value="500" />

</Items>

</dx:RibbonComboBoxItem>

<dx:RibbonToggleButtonItem Name="rtbiReportLegend" Text="凡例" Size="Small">

</LargeImage>

</SmallImage>

</dx:RibbonToggleButtonItem>

<dx:RibbonToggleButtonItem Name="rtbiReportNorth" Text="方位記号" Size="Small">

</LargeImage>

</SmallImage>

</dx:RibbonToggleButtonItem>

</Items>

</dx:RibbonGroup>

<dx:RibbonGroup Name="rgExport" Text="エクスポート">

<Items>

<dx:RibbonDropDownButtonItem Name="rddbiReportExport" Size="Large" Text="地図出力">

<Items>

<dx:RibbonDropDownButtonItem Name="ExportPng" Size="Large" Text="Png出力">

</LargeImage>

</SmallImage>

</dx:RibbonDropDownButtonItem>

</Items>

</LargeImage>

</SmallImage>

</dx:RibbonDropDownButtonItem>

</Items>

</dx:RibbonGroup>

</Groups>

</dx:RibbonTab>

</Tabs>

</dx:ASPxRibbon>

<dx:PanelContent runat="server">

</div>

</dx:PanelContent>

<dx:ASPxHiddenField runat="server" ClientInstanceName="ReportData" ID="ReportData">

</dx:ASPxHiddenField>

</dx:PopupControlContentControl>

</ContentCollection>

</dx:ASPxPopupControl>

</dx:PanelContent>

</PanelCollection>

</dx:ASPxCallbackPanel>

report.js

印刷プレビュー処理では、ol-extのPrintDialogクラスを参考にしたが、PrintDialogは、凡例の表示は出力されていなかったので、印刷時に、凡例のイメージを作成し、地図画像に描画する処理を追加した。
また、コンパス画像は独自のsvg画像を用意し描画させている。

function OnResizePrint(s, e) {
    var popupHeight = PrintPopup.GetHeight() - 260;
    var popupWidth = PrintPopup.GetWidth() - 42;
    RibbonPrint.SetWidth(popupWidth + 40);
    var size = getPrintSize();
    var pageElement = document.querySelector(".page-map");
    var printElement = document.querySelector(".print-map");
    printElement.style.width = popupWidth + 'px';
    printElement.style.height = popupHeight + 'px';
    var s = printElement.getBoundingClientRect();
    var scx = popupWidth / size[0];
    var scy = popupHeight / size[1];
    var sc = Math.min(scx, scy, 1);
    var tx = Math.round(popupWidth * sc / 2) - Math.round(popupWidth / 2);
    var ty = Math.round(popupHeight * sc / 2) - Math.round(popupHeight / 2);
    pageElement.style.width = size[0] + 'px';
    pageElement.style.height = size[1] + 'px';
    pageElement.style.top = '50%';
    pageElement.style.left = '50%';
    pageElement.style['-webkit-transform'] = pageElement.style.transform = 'translate(-50%,-50%) scale(' + sc + ')';
    var px = Math.round(5 / sc);
    pageElement.style['-webkit-box-shadow'] = pageElement.style['box-shadow'] = px + 'px ' + px + 'px ' + px + 'px rgba(0,0,0,.6)';
    pageElement.style['padding'] = (reportMargin * 96 / 25.4) + 'px';
    printMap.updateSize();
}
function OnShownPrint(s, e) {
    printMap = new ol.Map({
        target: 'printmap',
        controls: ol.control.defaults({ "attribution": false }),
        view: new ol.View({
            center: map.getView().getCenter(),
            zoom: map.getView().getZoom()
        })
    });
    canvasTitle = new ol.control.CanvasTitle({
        title: '',
        visible: false,
        style: new ol.style.Style({ text: new ol.style.Text({ font: '20px "Lucida Grande",Verdana,Geneva,Lucida,Arial,Helvetica,sans-serif' }) })
    });
    printMap.addControl(canvasTitle);
    compass = new ol.control.Compass({
        className: 'top',
        image: createCompassImage()
    });
    printMap.addControl(compass);
    setCompassVisible(false);
    printMap.addControl(new ol.control.CanvasScaleLine());
    var printLegend = new ol.legend.Legend({
        title: '凡例',
        margin: 5
    });
    AddLegendItems(printLegend, layersJson);
    legendCtrl = new ol.control.Legend({ legend: printLegend });
    printMap.addControl(legendCtrl);
    legendCtrl.setCanvas(true);
    legendCtrl.collapse(true);
    var layers = map.getLayers().getArray();
    layers.forEach(function (layer) {
        var printLayer = null;
        if (layer instanceof ol.layer.Tile) {
            printLayer = new ol.layer.Tile({
                name: layer.get('name'),
                type: 'base',
                source: layer.getSource(),
                visible: layer.getVisible(),
                opacity: layer.getOpacity(),
            });
            printMap.addLayer(printLayer);
        }
        else if (layer instanceof ol.layer.Vector) {
            var styleJson = LoadJson("../../Api/Layer/GetStyles?layername=" + layer.get('name'));
            printLayer = new ol.layer.Vector({
                name: layer.get('name'),
                source: layer.getSource(),
                visible: layer.getVisible(),
                opacity: layer.getOpacity(),
                style: function (feature, resolution) {
                    var style = makeStyle(styleJson, feature, resolution);
                    return style;
                }
            });
            printMap.addLayer(printLayer);
        }
    });
    printMap.on('moveend', function (evt) {
        var resolution = printMap.getView().getResolution();
        var scale = getScaleFromResolution(resolution);
        PrintPopup.SetFooterText('1:' + scale);
    });
    OnResizePrint();
}

function CreateMapCanvas() {
    var mapCanvas = document.createElement('canvas');
    var size = getPrintSize();
    mapCanvas.width = size[0];
    mapCanvas.height = size[1];
    const mapContext = mapCanvas.getContext('2d');
    mapContext.globalAlpha = Number(1);
    var canvaArray = printMap.getViewport().querySelectorAll('.ol-layers canvas, canvas.ol-fixedoverlay');
    canvaArray.forEach(canvas => {
        let matrix;
        const transform = canvas.style.transform;
        if (transform) {
            matrix = transform
                .match(/^matrix\(([^\(]*)\)$/)[1]
                .split(',')
                .map(Number);
        } else {
            matrix = [parseFloat(canvas.style.width) / canvas.width, 0, 0, parseFloat(canvas.style.height) / canvas.height, 0, 0,];
        }
        CanvasRenderingContext2D.prototype.setTransform.apply(mapContext, matrix);
        mapContext.drawImage(canvas, 0, 0);
    });

    if (!legendCtrl.isCollapsed()) {
        var legendCanvas = legendCtrl.getLegend().getCanvas();
        var canvas = document.createElement('canvas');
        canvas.width = legendCanvas.width;
        canvas.height = legendCanvas.height;
        var ctx = canvas.getContext('2d');
        ctx.fillStyle = 'rgba(255, 255, 255, 0.9)';
        ctx.fillRect(0, 0, canvas.width, canvas.height);
        ctx.drawImage(legendCanvas, 0, 0);
        var legendElement = document.querySelector('div.ol-legend');
        mapContext.drawImage(canvas, legendElement.offsetLeft, legendElement.offsetTop);
    }
    return mapCanvas;
}

function OnEndCallbackPrint(s, e) {
    if (s.cp_command_name == "PrintPopup") {
        PrintPopup.Show();
    }
}
function OnRibbonPrintButtonClick(s, e) {
    if (e.item.text === '印刷') {
        var mapCanvas = CreateMapCanvas();
        var sub = window.open();
        var area = '<img src="' + mapCanvas.toDataURL() + '" />';
        sub.document.write('' + area + '');
    }
    else if (e.item.name === 'rtbiReportTitle') {
        canvasTitle.setTitle(e.parameter);
        canvasTitle.setVisible(e.parameter != '');
    }
    else if (e.item.text === '方位記号') {
        setCompassVisible(e.item.checked);
    }
    else if (e.item.text === '凡例') {
        legendCtrl.setCanvas(!e.item.checked);
        legendCtrl.collapse(!e.item.checked);
    }
    else if (e.item.text === '縮尺') {
        var scale = Number(e.parameter);
        setMapScale(printMap, scale);
    }
    else if (e.item.text === 'Png出力') {
        var mapCanvas = CreateMapCanvas();
        mapCanvas.toBlob(function (blob) {
            const elem = window.document.createElement('a');
            elem.href = window.URL.createObjectURL(blob);
            elem.download = 'map.png';
            document.body.appendChild(elem);
            elem.click();
            document.body.removeChild(elem);
        }, 'image/png');
    }
    else if (e.item.parent) {
        if (e.item.checked) {
            if (e.item.parent.text == "用紙種別") { paperKind = e.item.text;}
            else if (e.item.parent.text == "印刷の向き") { pageOrientation = e.item.text; }
            else if (e.item.parent.text == "余白") {
                if (e.item.text == '余白なし') { reportMargin = 0;}
                else if (e.item.text == '余白(5mm)') { reportMargin = 5; }
                else if (e.item.text == '余白(10mm)') { reportMargin = 10; }
            }
            toggleSubButton(e.item.parent.name, e.item.name);
            OnResizePrint();
        }
    }
}
function toggleSubButton(buttonName, subButtonName) {
    var buttonItem = RibbonPrint.GetItemByName(buttonName);
    buttonItem.items.forEach(function (item) {
        item.checked = false;
    });
    buttonItem.getItemByName(subButtonName).checked = true;
}
function getPrintSize() {
    var paperSizes = new Map();
    paperSizes.set('A4', [210, 297])
    paperSizes.set('A3', [297, 420])

    var printSize = [
        Math.trunc(paperSizes.get(paperKind)[0] * 96 / 25.4),
        Math.trunc(paperSizes.get(paperKind)[1] * 96 / 25.4)
    ]

    if (pageOrientation == "横") {
        printSize = [printSize[1], printSize[0]];
    }

    return printSize;
}
function createCompassImage() {
    var img = new Image();
    var svg = LoadText('../../Content/images/svg/compass/north_arrow1.svg');
    img.src = "data:image/svg+xml;base64," + btoa(svg);
    var canvas = document.createElement('canvas');
    canvas.width = 100;
    canvas.height = 127;
    var ctx = canvas.getContext("2d");
    ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
    return img;
}
function setCompassVisible(b) {
    var compassctrl = document.querySelector(".ol-compassctrl");
    if (b) { compassctrl.classList.add('ol-visible'); }
    else {  compassctrl.classList.remove('ol-visible'); }
    if (printMap) { printMap.render(); }
}

function AddLegendItems(legend, jsons) {
    var rjsons = jsons.reverse();
    rjsons.forEach(layer => {
        if (layer.LayerType === 'GroupLayer') {
            AddLegendItems(legend, layer.Layers);
        } else {
            layer.Styles.forEach(style => {
                if (layer.Visible) {
                    var title = style.StyleName == '' ? layer.LayerName : style.StyleName;
                    var imageUrl = '../../Api/Layer/GetLegendGraphic?layername=' + layer.LayerId + '&styleId=' + style.StyleId;
                    var item = new ol.legend.Item({
                        title: title,
                        typeGeom: 'Point',
                        style: new ol.style.Style({
                            image: new ol.style.Icon({
                                src: imageUrl,
                                crossOrigin: 'anonymous'
                            })
                        })
                    })
                    legend.addItem(item);
                }
            });
        }
    });
}

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function OnResizePrint(s, e) {

var popupHeight = PrintPopup.GetHeight() - 260;

var popupWidth = PrintPopup.GetWidth() - 42;

RibbonPrint.SetWidth(popupWidth + 40);

var size = getPrintSize();

var pageElement = document.querySelector(".page-map");

var printElement = document.querySelector(".print-map");

printElement.style.width = popupWidth + 'px';

printElement.style.height = popupHeight + 'px';

var s = printElement.getBoundingClientRect();

var scx = popupWidth / size[0];

var scy = popupHeight / size[1];

var sc = Math.min(scx, scy, 1);

var tx = Math.round(popupWidth * sc / 2) - Math.round(popupWidth / 2);

var ty = Math.round(popupHeight * sc / 2) - Math.round(popupHeight / 2);

pageElement.style.width = size[0] + 'px';

pageElement.style.height = size[1] + 'px';

pageElement.style.top = '50%';

pageElement.style.left = '50%';

pageElement.style['-webkit-transform'] = pageElement.style.transform = 'translate(-50%,-50%) scale(' + sc + ')';

var px = Math.round(5 / sc);

pageElement.style['-webkit-box-shadow'] = pageElement.style['box-shadow'] = px + 'px ' + px + 'px ' + px + 'px rgba(0,0,0,.6)';

pageElement.style['padding'] = (reportMargin * 96 / 25.4) + 'px';

printMap.updateSize();

}

function OnShownPrint(s, e) {

printMap = new ol.Map({

target: 'printmap',

controls: ol.control.defaults({ "attribution": false }),

view: new ol.View({

center: map.getView().getCenter(),

zoom: map.getView().getZoom()

})

});

canvasTitle = new ol.control.CanvasTitle({

title: '',

visible: false,

style: new ol.style.Style({ text: new ol.style.Text({ font: '20px "Lucida Grande",Verdana,Geneva,Lucida,Arial,Helvetica,sans-serif' }) })

});

printMap.addControl(canvasTitle);

compass = new ol.control.Compass({

className: 'top',

image: createCompassImage()

});

printMap.addControl(compass);

setCompassVisible(false);

printMap.addControl(new ol.control.CanvasScaleLine());

var printLegend = new ol.legend.Legend({

title: '凡例',

margin: 5

});

AddLegendItems(printLegend, layersJson);

legendCtrl = new ol.control.Legend({ legend: printLegend });

printMap.addControl(legendCtrl);

legendCtrl.setCanvas(true);

legendCtrl.collapse(true);

var layers = map.getLayers().getArray();

layers.forEach(function (layer) {

var printLayer = null;

if (layer instanceof ol.layer.Tile) {

printLayer = new ol.layer.Tile({

name: layer.get('name'),

type: 'base',

source: layer.getSource(),

visible: layer.getVisible(),

opacity: layer.getOpacity(),

});

printMap.addLayer(printLayer);

}

else if (layer instanceof ol.layer.Vector) {

var styleJson = LoadJson("../../Api/Layer/GetStyles?layername=" + layer.get('name'));

printLayer = new ol.layer.Vector({

name: layer.get('name'),

source: layer.getSource(),

visible: layer.getVisible(),

opacity: layer.getOpacity(),

style: function (feature, resolution) {

var style = makeStyle(styleJson, feature, resolution);

return style;

}

});

printMap.addLayer(printLayer);

}

});

printMap.on('moveend', function (evt) {

var resolution = printMap.getView().getResolution();

var scale = getScaleFromResolution(resolution);

PrintPopup.SetFooterText('1:' + scale);

});

OnResizePrint();

}

function CreateMapCanvas() {

var mapCanvas = document.createElement('canvas');

var size = getPrintSize();

mapCanvas.width = size[0];

mapCanvas.height = size[1];

const mapContext = mapCanvas.getContext('2d');

mapContext.globalAlpha = Number(1);

var canvaArray = printMap.getViewport().querySelectorAll('.ol-layers canvas, canvas.ol-fixedoverlay');

canvaArray.forEach(canvas => {

let matrix;

const transform = canvas.style.transform;

if (transform) {

matrix = transform

.match(/^matrix$([^\(]*)$$/)[1]

.split(',')

.map(Number);

} else {

matrix = [parseFloat(canvas.style.width) / canvas.width, 0, 0, parseFloat(canvas.style.height) / canvas.height, 0, 0,];

}

CanvasRenderingContext2D.prototype.setTransform.apply(mapContext, matrix);

mapContext.drawImage(canvas, 0, 0);

});

if (!legendCtrl.isCollapsed()) {

var legendCanvas = legendCtrl.getLegend().getCanvas();

var canvas = document.createElement('canvas');

canvas.width = legendCanvas.width;

canvas.height = legendCanvas.height;

var ctx = canvas.getContext('2d');

ctx.fillStyle = 'rgba(255, 255, 255, 0.9)';

ctx.fillRect(0, 0, canvas.width, canvas.height);

ctx.drawImage(legendCanvas, 0, 0);

var legendElement = document.querySelector('div.ol-legend');

mapContext.drawImage(canvas, legendElement.offsetLeft, legendElement.offsetTop);

}

return mapCanvas;

}

function OnEndCallbackPrint(s, e) {

if (s.cp_command_name == "PrintPopup") {

PrintPopup.Show();

}

function OnRibbonPrintButtonClick(s, e) {

if (e.item.text === '印刷') {

var mapCanvas = CreateMapCanvas();

var sub = window.open();

var area = '<img src="' + mapCanvas.toDataURL() + '" />';

sub.document.write('' + area + '');

}

else if (e.item.name === 'rtbiReportTitle') {

canvasTitle.setTitle(e.parameter);

canvasTitle.setVisible(e.parameter != '');

}

else if (e.item.text === '方位記号') {

setCompassVisible(e.item.checked);

}

else if (e.item.text === '凡例') {

legendCtrl.setCanvas(!e.item.checked);

legendCtrl.collapse(!e.item.checked);

}

else if (e.item.text === '縮尺') {

var scale = Number(e.parameter);

setMapScale(printMap, scale);

}

else if (e.item.text === 'Png出力') {

var mapCanvas = CreateMapCanvas();

mapCanvas.toBlob(function (blob) {

const elem = window.document.createElement('a');

elem.href = window.URL.createObjectURL(blob);

elem.download = 'map.png';

document.body.appendChild(elem);

elem.click();

document.body.removeChild(elem);

}, 'image/png');

}

else if (e.item.parent) {

if (e.item.checked) {

if (e.item.parent.text == "用紙種別") { paperKind = e.item.text;}

else if (e.item.parent.text == "印刷の向き") { pageOrientation = e.item.text; }

else if (e.item.parent.text == "余白") {

if (e.item.text == '余白なし') { reportMargin = 0;}

else if (e.item.text == '余白(5mm)') { reportMargin = 5; }

else if (e.item.text == '余白(10mm)') { reportMargin = 10; }

}

toggleSubButton(e.item.parent.name, e.item.name);

OnResizePrint();

}

function toggleSubButton(buttonName, subButtonName) {

var buttonItem = RibbonPrint.GetItemByName(buttonName);

buttonItem.items.forEach(function (item) {

item.checked = false;

});

buttonItem.getItemByName(subButtonName).checked = true;

}

function getPrintSize() {

var paperSizes = new Map();

paperSizes.set('A4', [210, 297])

paperSizes.set('A3', [297, 420])

var printSize = [

Math.trunc(paperSizes.get(paperKind)[0] * 96 / 25.4),

Math.trunc(paperSizes.get(paperKind)[1] * 96 / 25.4)

]

if (pageOrientation == "横") {

printSize = [printSize[1], printSize[0]];

}

return printSize;

}

function createCompassImage() {

var img = new Image();

var svg = LoadText('../../Content/images/svg/compass/north_arrow1.svg');

img.src = "data:image/svg+xml;base64," + btoa(svg);

var canvas = document.createElement('canvas');

canvas.width = 100;

canvas.height = 127;

var ctx = canvas.getContext("2d");

ctx.drawImage(img, 0, 0, canvas.width, canvas.height);

return img;

}

function setCompassVisible(b) {

var compassctrl = document.querySelector(".ol-compassctrl");

if (b) { compassctrl.classList.add('ol-visible'); }

else { compassctrl.classList.remove('ol-visible'); }

if (printMap) { printMap.render(); }

}

function AddLegendItems(legend, jsons) {

var rjsons = jsons.reverse();

rjsons.forEach(layer => {

if (layer.LayerType === 'GroupLayer') {

AddLegendItems(legend, layer.Layers);

} else {

layer.Styles.forEach(style => {

if (layer.Visible) {

var title = style.StyleName == '' ? layer.LayerName : style.StyleName;

var imageUrl = '../../Api/Layer/GetLegendGraphic?layername=' + layer.LayerId + '&styleId=' + style.StyleId;

var item = new ol.legend.Item({

title: title,

typeGeom: 'Point',

style: new ol.style.Style({

image: new ol.style.Icon({

src: imageUrl,

crossOrigin: 'anonymous'

})

legend.addItem(item);

}

});

}

});

}

印刷プレビュー画面①

前回は、画面の地図から画像を生成しており、印刷画面が切れてしまう場合があったが、今回は、プレビュー画面のサイズに応じて、地図画面サイズをリサイズしているため、印刷画面が切れることがなくなった。

印刷プレビュー画面②

タイトル、方位記号、凡例をクリックすると、地図に出力される。

ブラウザの印刷画面

印刷プレビュー画面とほぼ同じ印刷ができるようになった。

2022年3月
月	火	水	木	金	土	日
	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	31

はじめに

処理概要は以下の通り

PrintDialog.ascx

report.js

印刷プレビュー画面①

印刷プレビュー画面②

ブラウザの印刷画面

共有:

関連