Question

例如，我有一个由两个多边形组成的多面体。我可以使用modifyFeature控件和delete-key删除顶点。但是，modifyFeature控件不允许我完全删除多边形，因为它必须包含至少3个顶点。如何从多面体功能中完全删除多边形（使用删除键）？ OpenLayers是否有适当的控件或插件？

我自己尝试修补控件，但这导致了多个小错误。所以我想在我花费大量时间来解决这些问题之前，先询问是否有人已经这样做了。

Answer 1

removeComponent: function(point) {
    var removed = this.components && (this.components.length > 3);
    if (removed) {
        //remove last point
        this.components.pop();

        //remove our point
        OpenLayers.Geometry.Collection.prototype.removeComponent.apply(this, 
                                                                arguments);
        //append copy of first point
        var firstPoint = this.components[0];
        OpenLayers.Geometry.Collection.prototype.addComponent.apply(this, 
                                                            [firstPoint]);
    //bm extension: possibility to delete geometry from multigeometries
    } else if (this.components && this.parent && this.parent.parent && this.parent.parent.CLASS_NAME === "OpenLayers.Geometry.MultiPolygon") {        
        //polygon with hole
        if (this.parent.components.length > 1) {              
            for (var i = 0; i < this.parent.components.length && this.parent.components.length > 1; i++) {
                if (this.parent.components[i].id === this.id) {
                    OpenLayers.Util.removeItem(this.parent.components, this.parent.components[i]);
                    this.parent.clearBounds();
                    return true;
                }
            }
        }
        //seperate polygon
        for (var i = 0; i < this.parent.parent.components.length && this.parent.parent.components.length > 1; i++) {
            if (this.parent.parent.components[i].id === this.parent.id) {
                OpenLayers.Util.removeItem(this.parent.parent.components, this.parent.parent.components[i]);
                this.parent.parent.clearBounds();
                return true;
            }
        }
    }
    return removed;
},

OpenLayers 2.13.1：从多几何特征中删除几何

1 个答案: