OpenLayers 2：僅用兩點繪制路徑

Question

我想畫一條不超過2分的道路。 在第二點上，我希望路徑完成。

誰能幫助我如何在openlayers 2中實現此功能。

我嘗試了這段代碼，但是盡管行創建得很好，但是它給出了錯誤。

        _singleLineControl = new OpenLayers.Control.DrawFeature(
            _singleLineLayer,
            OpenLayers.Handler.Path,
            {
                eventListeners: { "featureadded": drawingFinished },
                callbacks: {
                    point: function (pointGeometry, lineGeometry) {
                        var numPoints = lineGeometry.getVertices().length;
                        if (numPoints == 3) {
                            this.drawFeature(lineGeometry);
                        }
                    }
                }
            });
        viewer.addControl(_singleLineControl);
        _singleLineControl.handler.single = true;
        _singleLineControl.handler.freehand = false;
        _singleLineControl.deactivate();

Answer 1

自己找到解決方案:)使用maxVertices

        // single line drawing control
        _singleLineControl = new OpenLayers.Control.DrawFeature(
            _singleLineLayer,
            OpenLayers.Handler.Path,
            {
                eventListeners: { "featureadded": drawingFinished },
                handlerOptions: {
                    maxVertices: 2,
                    single: true,
                    freehand: false,
                }
            });
        viewer.addControl(_singleLineControl); 
        _singleLineControl.deactivate();