image.getState 不是函数（在 angular 中使用 ol 时）

Question

我试图在 angular(4) 应用程序中实现以下代码 http://viglino.github.io/ol-ext/examples/layer/map.geoimage.html

但在尝试启动浏览器时总是会导致错误。

首先，我的导入（两个库都是从 npm 在本地安装的）：

`

import OlMap from 'ol/map';
import OlView from 'ol/view';
import OlLayerVector from 'ol/layer/vector';
import OlLayerTile from 'ol/layer/Tile';
import OlSourceOSM from 'ol/source/OSM';
import OlLayerImage from 'ol/layer/image';
import OlSourceImageVector from 'ol/source/imagevector';
import OlSourceImageStatic from 'ol/source/ImageStatic';
import OlProjection from 'ol/proj/projection';
import OlSourceVector from 'ol/source/vector';
import OlBaseImage from 'ol/imagebase';
import OlImage from 'ol/image';

import OlSourceGeoImage from 'ol-ext/source/GeoImage';
import OlAttribution from 'ol/attribution';
import OlOverlay from 'ol/overlay';`

请在下面找到我使用的代码：（这部分正常工作） `

// OSM tiles as background
    var OSMBackground = new OlLayerTile({
        source: new OlSourceOSM()
    });
// Custom extend used to position my factoryBackgroundLayer image
    var newExtent = OlProj.transformExtent(
        [2.385083, 48.817463, 2.386024, 48.817694],
        "EPSG:4326", "EPSG:3857"
    );


    var factoryBackgroundLayer = new OlLayerImage({
        source: new OlSourceImageStatic({
            url: 'http://viglino.github.io/ol-ext/examples/data/IGNF_PVA_1-0__1976-03-24_pt.jpg',
            // projection: projection,
            // imageExtent: extent
            projection: 'EPSG:27700',
            imageExtent: newExtent
        })
    });


    var map = new OlMap({
        layers: [OSMBackground
            , factoryBackgroundLayer

        ],
        target: 'map',
        view: new OlView({
            center: OlProj.fromLonLat([2.585487, 48.817561]),
            zoom: 20, // Set to 20 is better
        })
    });`

然后我尝试显示地理参考图像： `

x = 274764.75;
y = 6243935.64;
sx = 0.589;
sy = 0.597;
xmin = 0;
ymin = 0;
xmax = 5526;
ymax = 5000;
rotate = 7.44;
opacity = 0.7;

var geoSource = new OlSourceGeoImage(
        {
            url: 'http://viglino.github.io/ol-ext/examples/data/IGNF_PVA_1-0__1976-03-24_pt.jpg',
            imageCenter: [this.x, this.y],
            imageScale: [this.sx, this.sy],
            imageCrop: [this.xmin, this.ymin, this.xmax, this.ymax],
            imageRotate: this.rotate * Math.PI / 180,
            projection: 'EPSG:27700',
        });


    var geoimg = new OlLayerImage(
        {
            state: "ready",

            opacity: 0.7,
            source: geoSource,
            imageExtent: newExtent
        });

    this.map.addLayer(geoimg);

`

它总是导致同样的问题：

ERROR TypeError: image.getState is not a function at _ol_renderer_canvas_ImageLayer_._ol_renderer_Layer_.loadImage (layer.js:114) at _ol_renderer_canvas_ImageLayer_.prepareFrame (imagelayer.js:160) at _ol_renderer_canvas_Map_.renderFrame (map.js:183) at _ol_Map_._ol_PluggableMap_.renderFrame_ (pluggablemap.js:1180) at _ol_Map_.eval (pluggablemap.js:87) at ZoneDelegate.invokeTask (zone.js:421) at Object.onInvokeTask (core.js:4740) at ZoneDelegate.invokeTask (zone.js:420) at Zone.runTask (zone.js:188) at ZoneTask.invokeTask (zone.js:496)

所以关于这份报告，我尝试使用 ol.source.Image 对象而不是 url 但不是更成功。

有人用过这个框架吗？任何会导致此问题的 ol 更新的想法？

PS: 我也试过 SnapGuides 行示例 (http://viglino.github.io/ol-ext/examples/interaction/map.interaction.snapguides.html)，它运行得很好所以 ol-ext API集成听起来不错！

Answer 1

感谢作者问题已解决：https://github.com/Viglino/ol-ext/issues/93：

"I've found an issue with the GeoImage source: the getImage() function overwrite the Image source function. Just change it to getGeoImage() solves the problem. I've pushed a new commit on master branch. If you're using npm just replace the source/GeoImage.js in the node module with the one of the git. It will be included in the next version."

顺便说一下，我添加了用 Viglino 提交的那个替换 node_modules 目录中的 GeoImage.js。

image.getState 不是函数（在 angular 中使用 ol 时）

image.getState is not a function (when using ol in angular)

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