效果

代码

if (value === 'Square') {
            value = 'Circle';
            //正方形图形（圆）
            geometryFunction = ol.interaction.Draw.createRegularPolygon(4);
        }
        else  if (value=='Circle'){
            geometryFunction = ol.interaction.Draw.createRegularPolygon(0);
        }
        else if (value === 'Box') {
            value = 'Circle';
            maxPoints = 2;
         geometryFunction=ol.interaction.Draw.createBox();
        }

        //实例化交互绘制类对象并添加到地图容器中
        draw = new ol.interaction.Draw({
            //绘制层数据源
            source: source,
            /** @type {ol.geom.GeometryType}几何图形类型 */
            type: value,
            //几何信息变更时调用函数
            geometryFunction: geometryFunction,
            //最大点数
            maxPoints: maxPoints
            // ,geometryName:""+(feture123)  //唯一的标识
        });
        map.addInteraction(draw);

标签：功能,ol,Draw,value,interaction,绘图,geometryFunction,openlayers,Circle
来源： https://blog.csdn.net/qq_25064691/article/details/116099338